CEM 852 Exam LDA, THF, 0 C, 15 min; then
|
|
- Suzanna Whitehead
- 5 years ago
- Views:
Transcription
1 CEM 85 Exam- April, 005 This exam consists of 5 pages. Please write ALL your answers in the answer books. Please write legibly and draw all structures clearly. Good luck. 1. Provide examples of the following name reactions: (1 pts) a. ozaki-iyama-kishi coupling b. Glaser coupling c. aza-prins cyclization d. Paterno-üchi reaction. Provide a brief written description of the role played by each of the following reagents typically employed in the Sharpless asymmetric dihydroxylation: (3 pts) a. K s () 4 b. K 3 Fe(C) 6 c. S 3. Provide the product or products of the reactions outlined below. Show all intermediate compounds and be sure to indicate the product s relative or absolute stereochemistry. For reactions where multiple products are possible, indicate the major and minor species. (8 pts) (a) 1. LDA, TF, 0 C, 15 min; then. 3, C Cl, -78 C, 30 s 3. 3 P=CC, C Cl, C, 3 h 4. Li, - (:1), ˇC, 3 h I (b) 1. (Z)-1,4-dichloro--butene (1.0 eq.), a ( eq.), DMF. Cy, TF, 0 C; then, aac, 3. Cr 3, S 4, Et, 0 C 4. Zn, rc C Et, Et (c) Tf 1. ( 3 Sn), LiCl, cat. Pd(P 3 ) 4, TF, 60 C, 1 h. IS, C Cl, rt, h 3. t-uli, Et, -78 C; then CeCl 3, TF -78 C; then -78 C, h 1
2 (d) TMS 1. Li; then Se Se. Cu(C)Li TF, -78 C; then 4 Cl 3. LiAl 4, Et 4. Et Zn, C I, benzene, 60 C (e) 1. 3 Al, Cp ZrCl, (C Cl), 3 C, 4 h; then TMS.5 mol % of Pd (dba) 3, r ZnCl (1 eq), TF, 10 mol % tri(-furyl)phosphine]. K C 3,, 3 C, 3 h 3. uli, TF, -78 C; then I (f) n 1. S, a, /t-u, Δ.,-dimethoxypropane, cat. PCl 3 3. mcpa, -78 C 4. Ac, aac, Δ (g) Ac r 8 mol % Pd(P 3 ) 4 Et 3, C, 50 C A 6 mol % Pd(0) n-u 4 Ac 4. Provide the reagents necessary to convert the starting material to the product. Most of these transformations will require more than one step. e sure to consider the product s relative or absolute stereochemistry. To maximize your chances at partial credit, it is recommended that you show all intermediate compounds. (8 pts) (a) n (b) Si 3 Et
3 (c) Pr Pr r (d) C Ac C (e) n n n (f) TS g) C 5. eactions of A and with mcpa are complementary with regards to the direction of epoxidation. This can be explained by considering A-strain combined with the putative 10 olefin-hydroxyl bite angle. Thus, compound A prefers reactive conformation I while reacts via conformation II during its mcpa epoxidation. An examination of I and II can also explain why the mcpa epoxidation of is more selective that that of A. Please explain. (5 pts) A m-cpa C Cl 0 C I m-cpa C Cl 0 C II 3
4 6. As shown in Scheme 1, allyl or (E)-crotylboration with the, tartrate derived reagents react at the Si face of simple aliphatic or aryl aldehydes to give the corresponding homoallylic alcohols. In a related fashion the S,S tartrate derived boronates react at the e face (not shown). Scheme 1. C ipr n-c 8 17 C () () C ipr n-c 8 17 = (86% ee) = (88% ee) Similarly the (,)-(E)-crotylboronate reacts at the Si face of the optically active aldehyde shown in Scheme. In this case, Si face attack also corresponds to a Felkin approach and affords a high degree of stereocontrol (97:3). As expected the (S,S)-(E)-crotylboronate preferentially attacks the e face, but as this approach is anti-felkin a loss of selectivity is seen. Scheme. z 3,4-anti-4,5-anti diastereomer major (85:15) anti-felkin addition with respect to C C ipr C ipr z C C ipr () C ipr () z 3,4-anti-4,5-syn diastereomer major (97:3) Felkin addition with respect to C C ipr C ipr z C ipr () C ipr () z In contrast to the examples above, reaction of the alanine derived aldehyde with the (,)-(E)- crotylboronate proceeds with e face attack to give as the major product the anti-felkin product shown in Scheme 3. Explain this somewhat surprising result. (8 pts). Scheme 3. C ipr oc C () C ipr () oc oc (75:5) 4
5 7. Treatment of halide A with u 3 Sn results in a 5-exo-dig radical cyclization to give intermediate, which is capable of undergoing a 10-endo-trig/6-exo-trig radical macrocyclizationtransannulation process to afford C. 1 -M of C reveals that this compound has no vinyl protons. Provide the structures of ( pts) and C (3 pts). E E r A; E = C (Z/E 9:1) u 3 Sn, AI, 80 C 10-endo/ 6-exo radical macrocyclizationtransannulation C 8. The Colvin rearrangement is a method to convert aldehydes to alkynes. Provide a complete arrow (electron) pushing mechanism for this transformation. (ote: A 1 -M of TMSC shows two peaks one of which is at. ppm and the other at ca. 0 ppm.) (6 pts) TS C 1.4 eq. LDA, 1.4 eq. TMSC, TF, -78 C, 1 h; then 5 C, h TS 9. While the Colvin rearrangement above works well, other substrates are known to give unwanted side products. For example benzaldehyde does not rearrange to phenylethyne but instead gives benzyl alcohol and α-diazoacetophenone (Scheme 4). In another example, benzil undergoes the desired transformation, but the product is accompanied by significant amounts of pyrazole (Scheme 5). Provide a complete arrow (electron) pushing mechanism for the formation of either the pyrazole or the benzyl alcohol. (5 pts) Scheme 4. uli, TMSC, C TF, 0 C, h; C then Scheme eq. uli, 1.5 equiv. TMSC, Et, 0 C, 10 min ()C C() TMS C() onus Question: In a few hours MSU will take to the court for a semi final game in this year s CAA men s basketball championship. For a 3-point play name one organic chemistry faculty member from each of the other three final four schools: Illinois (Urbana-Champaign), Louisville, and orth Carolina (Chapel ill). 5
CEM 852 Exam-2 April 2, 2016
CM 852 xam-2 April 2, 2016 This exam consists of 6 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 100. In answering your questions, please
More informationCEM 852 Final Exam. May 6, 2010
CEM 852 Final Exam May 6, 2010 This exam consists of 7 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 150. n answering your questions,
More informationCEM 852 Exam-2 April 11, 2015
CEM 852 Exam-2 April 11, 2015 This exam consists of 6 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 100. In answering your questions,
More informationCEM 852 Final Exam. May 5, 2011
CEM 852 Final Exam May 5, 2011 This exam consists of 8 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 150. In answering your questions,
More informationCHEM 203. Final Exam December 15, 2010 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Final Exam December 15, 2010 Your name: ANSWERS This a closed-notes, closed-book exam You may use your set of molecular models This test contains 15 pages Time: 2h 30 min 1. / 16 2. / 15 3. / 24
More informationCEM 852 Exam What is the ratio of (S) / (R) alcohol formed during this reaction? (2 pts) baker's yeast. H 2 O, sucrose 25 C
CEM 852 Exam-1 February 19, 2005 This exam consists of 5 pages. Please write ALL your answers in the answer books. Please write legibly and draw all structures clearly. Good luck. 1. What is the ratio
More informationCHEM 203. Final Exam December 18, This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Final Exam December 18, 2013 Your name: This a closed-notes, closed-book exam You may use your set of molecular models This test consists of 10 pages Time: 2h 30 min 1. / 20 2. / 20 3. / 30 4.
More informationCHEM 330. Final Exam December 8, 2010 ANSWERS. This a closed-notes, closed-book exam. The use of molecular models is allowed
CEM 330 Final Exam December 8, 2010 Your name: ASWERS This a closed-notes, closed-book exam The use of molecular models is allowed This exam contains 10 pages Time: 2h 30 min 1. / 20 2. / 20 3. / 20 4.
More informationCHEM 330. Final Exam December 5, 2014 ANSWERS. This a closed-notes, closed-book exam. The use of molecular models is allowed
CEM 330 Final Exam December 5, 2014 Your name: ASWERS This a closed-notes, closed-book exam The use of molecular models is allowed This exam consists of 12 pages Time: 2h 30 min 1. / 30 2. / 30 3. / 30
More informationCHEM 330. Final Exam December 11, 2007 A N S W E R S. This a closed-notes, closed-book exam. The use of molecular models is allowed
CEM 330 Final Exam December 11, 2007 Your name: A S W E R S This a closed-notes, closed-book exam The use of molecular models is allowed This exam contains 12 pages Time: 2h 30 min 1. / 20 / 20 3. / 30
More informationStereoselective reactions of the carbonyl group
1 Stereoselective reactions of the carbonyl group We have seen many examples of substrate control in nucleophilic addition to the carbonyl group (Felkin-Ahn & chelation control) If molecule does not contain
More informationCHEM 203. Final Exam December 18, 2013 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Your name: Final Exam December 18, 2013 ANSWERS This a closed-notes, closed-book exam You may use your set of molecular models This test consists of 10 pages Time: 2h 30 min 1. / 20 2. / 20 3.
More informationCEM 852 Exam-1 February 20, 2016
EM 852 Exam-1 February 20, 2016 This exam consists of 5 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 100. In answering your questions,
More informationCHEM 203. Midterm Exam 1 October 31, 2008 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Midterm Exam 1 ctober 31, 2008 Your name: ANSWERS This a closed-notes, closed-book exam You may use your set of molecular models This exam contains 8 pages Time: 1h 30 min 1. / 15 2. / 16 3. /
More informationCHEMISTRY 341. Final Exam Tuesday, December 16, Problem 1 15 pts Problem 9 8 pts. Problem 2 5 pts Problem pts
CEMISTRY 341 Final Exam Tuesday, December 16, 1997 Name NAID Problem 1 15 pts Problem 9 8 pts Problem 2 5 pts Problem 10 21 pts Problem 3 26 pts Problem 11 15 pts Problem 4 10 pts Problem 12 6 pts Problem
More informationCHEM 241 (Davis) Organic Chemistry II Final Exam Friday December 14, NAME (Last, First) DISCUSSION SECTION #
CEM 241 (Davis) rganic Chemistry II Final Exam Friday December 14, 2007 1 NAME (Last, First) DISCUSSIN SECTIN # Initial of last name Instructions Please fill in your name in the space above and on the
More informationChem 14D Spring 2010 Garg Midterm 1 Review / Practice Problems
Some Topics to Study (very broad): Chem 14D Spring 2010 Garg Midterm 1 Review / Practice Problems Reactivity stuff Classify atoms as electrophilic or nucleophilic Definitions of nucleophiles/electrophiles
More informationChem 342 Organic Chemistry II Final Exam 13 May 2009
hem 342 rganic hemistry II Final Exam 13 May 2009 KEY Please read through each question carefully and answer in the spaces provided. A good strategy is to go through the test and answer all the questions
More informationTips for taking exams in 852
Comprehensive Tactical Methods in rganic Synthesis W. D. Wulff 1) Know the relative reactivity of carbonyl compounds Tips for taking exams in 852 Cl > > ' > > ' N2 eg: 'Mg Et ' 1equiv. 1equiv. ' ' Et 50%
More informationChemistry 233 Exam 3 (Green) The Periodic Table
Name: Last First MI Chemistry Exam (Green) Summer 7 Dr. J. sbourn Instructions: The first questions of this exam should be answered on the provided Scantron. You must use a pencil for filling in the Scantron
More informationChem Final Examination August 7, 2004
Chem 281 2004-2 Final Examination August 7, 2004 Name: Student Number: Note: You are allowed to use models for this exam. Notes, textbooks and calculators are strictly prohibited. Write your final answers
More informationOnly five of the molecules below may be prepared as the sole product of allylic halogenation of the respective alkene. Circle those five.
Chem 232 D. J. Wardrop wardropd@uic.edu Problem Set 6 Answers Question 1. nly five of the molecules below may be prepared as the sole product of allylic halogenation of the respective alkene. Circle those
More informationCH Organic Chemistry I (Katz) Practice Exam #3- Fall 2013
C2710 - rganic Chemistry I (Katz) Practice Exam #3- all 2013 Name: Score: Part I - Choose the best answer and write the letter of your choice in the space provided. (32 pts) 1. f the following, which reaction
More informationCuI CuI eage lic R tal ome rgan gbr ommon
Common rganometallic eagents Li Et 2 Li Mg Et 2 Li alkyllithium rignard Mg Mg Li Zn TF ZnCl 2 TF dialkylzinc Zn 2 2 Zn Li CuI TF ganocuprate CuI 2 2 CuI common electrophile pairings ' Cl ' '' ' ' ' ' '
More informationORGANIC - CLUTCH CH ADDITION REACTIONS.
!! www.clutchprep.com CONCEPT: GENERAL MECHANISM Addition reactions are ones in which 1 bond is broken and 2 new bonds are formed. They are the inverse of reactions EXAMPLE: Provide the mechanism for the
More informationChem 332, Exam 4. Spring Provide reagents for the following transformations (2 pts each) NaOH , KOH. 4) H2/Pd NO 2. 1) AlCl 3 O 2) H 2 NNH 2
AME 1. Provide reagents for the following transformations (2 pts each) 2 a 2 1) Al 3 2) 2 2, K h! 1) 3, 2) LDA 3) + 4) 2/Pd C 2 AME 2a Circle the correct product (no mechanisms or partial credit). 3 pts
More informationShi Asymmetric Epoxidation
Shi Asymmetric Epoxidation Chiral dioxirane strategy: R 3 + 1 xone, ph 10.5, K 2 C 3, H 2, C R 3 formed in situ catalyst (10-20 mol%) is prepared from D-fructose, and its enantiomer from L-sorbose oxone,
More informationFinal Exam April 30, 2014
Bennett Department of Chemistry Chemistry 234 Final Exam April 30, 2014 ame: This exam is a closed book, closed notes. Calculators and a molecular model set are allowed. You must show your work in order
More informationStereoselective reactions of enolates
1 Stereoselective reactions of enolates Chiral auxiliaries are frequently used to allow diastereoselective enolate reactions Possibly the most extensively studied are the Evan s oxazolidinones These are
More informationCHEMISTRY 850 Exam I Saturday, October 20, 2012 NAME (Print)
CEMISTRY 850 Exam I Saturday, ctober 20, 2012 AME (Print) Question Max Points Score 1 12 2 8 3 12 4 10 5 14 6 10 7 12 8 24 9 16 10 8 11 8 12 14 13 16 14 36 BUS 8 Exam Total 1 1) Draw the detailed arrow
More informationReduction. Boron based reagents. NaBH 4 / NiCl 2. Uses: Zn(BH 4 ) 2. Preparation: Good for base sensitive groups Chelation control model.
Uses: Ar N 2 Ar N 2 Ar N Ar N 2 eduction Boron based reagents NaB 4 / NiCl 2 2 Ar C N Ar C N 2 Preparation: Zn(B 4 ) 2 ZnCl 2 (Ether) NaB 4 Zn(B 4 ) 2 Good for base sensitive groups Chelation control model
More informationInitials: 1. Chem 633: Advanced Organic Chemistry 2016 Final Exam
Initials: 1 ame: Chem 633: Advanced rganic Chemistry 2016 Final Exam This exam is closed note, closed book. Please answer the following questions clearly and concisely. In general, use pictures and less
More informationFinal Exam /415 ( CHEM 6352 Fall %) Name
Final Exam /415 ( CEM 6352 Fall 2011 %) Name Dec. 15 th, 2011 8:00-12:00 You may NT use any references or aids to complete the following with the exception of a chemical model set and the scrap paper that
More informationOrganocopper Reagents
rganocopper eagents General Information!!! why organocopper reagents? - Efficient method of C-C bond formation - Cu less electropositive than Li or Mg, so -Cu bond less polarized - consequences: 1. how
More informationThere are 15 total pages to this exam. Please be sure your copy has 15 pages before you begin.
Initials: 1 ame: Chem 633: Advanced rganic Chemistry Midterm 2 Please answer the following questions clearly and concisely. Write your answers in the space provided. Write your initials on each page you
More informationIntroduction to Synthesis: Design (CHE686) Spring 2015 Exam #1 3/6/15
Introduction to ynthesis: Design (CE686) pring 2015 Exam #1 3/6/15 AME: KEY ome Pointers: 1. ELAX!! 2. ead the instructions for each question carefully. Be sure you understand what is required. If you
More informationCEM 850 Final Exam H N H H O H H O H C H 2. MeO
CEM 850 Final Exam December 11, 2003 This exam consists of 20 pages. Be sure to write your name on all pages of the exam. Please write legibly and draw all structures clearly. Good luck. 1. (10 pts) Estimate
More informationChem 14D Final Exam. Spring 2010 / Prof. Neil Garg. Thursday, June 10, :30 AM 2:30 PM
General Instructions: Chem 14D Final Exam Spring 2010 / Prof. eil Garg This is a standard closed-note exam. Thursday, June 10, 2010 11:30 AM 2:30 PM Chem 14D Final Exam P.1 Please read each question carefully
More informationI. Liu Lab. Ka<e Boknevitz 1
A ighly Convergent Total Synthesis of Leustroducsin B Barry M. Trost,* Berenger Biannic, Cheyenne S. Brindle, B. Michael Keefe, Thomas J. unger, and Ming-Yu gai Department of Chemistry, Stanford University,
More informationChem 253 Problem Set 7 Due: Friday, December 3, 2004
Chem 253 roblem Set 7 ue: Friday, ecember 3, 2004 Name TF. Starting with the provided starting material, provide a concise synthesis of. You may use any other reagents for your synthesis. It can be assumed
More informationExam 4. Name CHEM 210. PBr 3. HBr. 1) NaH 2) Br H 2 SO 4. 1) NaOCH 3 2) dil. H 3 O + O CH 3 OH, H 2 SO 4. 1) LDA, -78 o C.
Exam 4 Name CEM 210 1. (48 pts) Complete the equations for the following reactions. Show all organic products if two or more products form, indicate the major product. Indicate proper stereochemistry where
More informationName: Student Number: University of Manitoba - Department of Chemistry CHEM Introductory Organic Chemistry II - Term Test 1
Name: Student Number: University of Manitoba - Department of Chemistry CEM 2220 - Introductory Organic Chemistry II - Term Test 1 Thursday, February 13, 2014; 7-9 PM This is a 2-hour test, marked out of
More informationOrganic Chemistry Semester II 1st unit specialty reactions (mechanisms not emphasized)
rganic Chemistry Semester II 1st unit specialty reactions (mechanisms not emphasized) 1. X addition to an alkyne powerful method to add halogens (Cl,, I) to an alkyne to create geminal dihalides (pages
More informationExam I 19 April 2004 Name:
Chem 317 S04 Page 1 of 7 Kantorowski Exam I 19 April 2004 Name: This exam contains 6 pages of questions confirm this once you begin The last page is a spectral data table that can be removed You will have
More informationRadical Reactions. Radical Stability!!! bond dissociation energies X Y X + Y. bond BDE (kcal/mol) bond BDE (kcal/mol) CH 3 CH 3 CH 2 95 O H R 2 C H
adical eactions adical Stability!!! bond dissociation energies X Y X Y bond BDE (kcal/mol) bond BDE (kcal/mol) C 3 104 108 C 3 C 2 98 110 95 2 C 102 (-) 93 (C-) 92 C 3 C 3 36 89 85 C 3 C 3 80 adical eactions
More information1. Radical Substitution on Alkanes. 2. Radical Substitution with Alkenes. 3. Electrophilic Addition
1. Radical Substitution on Alkanes Only Cl and Br are useful at the laboratory level. Alkane reactivity: tertiary > secondary > primary > methyl Numbers below products give their relative yield. Relative
More informationChapter 5 Three and Four-Membered Ring Systems
Chapter 5 Three and Four-mbered ing ystems 5.1 Aziridines Aziridines are good alkylating agents because of their tendency to undergo ring-opening reaction with nucleophiles 例 mitomycin C antibiotic and
More informationCHEM 203. Final Exam December 12, This a closed-notes, closed-book exam. You may use your set of molecular models. This test contains 11 pages
CEM 203 Final Exam December 12, 2012 Your name: This a closed-notes, closed-book exam You may use your set of molecular models This test contains 11 pages Time: 2h 30 min 1. / 20 2. / 24 3. / 26 4. / 30
More informationa) Write the mechanism of Friedel-Crafts alkylation of ethyl benzene to give 1,4- diethylbenzene. Show all arrow pushing.
a) Write the mechanism of Friedel-Crafts alkylation of ethyl benzene to give 1,4- diethylbenzene. Show all arrow pushing. Br AlBr 3 b) Using resonance and inductive effects, explain why an ethyl group
More informationPartial Periodic Table
Easily Legible Printed Name: CHEM 3351 (100), Fall 2016 Professor Walba Second Hour Exam October 18, 2016 CU Honor Code Pledge: On my honor, as a University of Colorado at Boulder Student, I have neither
More informationO + k 2. H(D) Ar. MeO H(D) rate-determining. step?
ame: CEM 633: Advanced rganic Chem: ysical Problem Set 6 (Due Thurs, 12/8/16) Please do not look up references until after you turn in the problem set unless otherwise noted. For the following problems,
More informationChem 112A: Final Exam
Chem 112A: Final Exam December 15th, 2010 Please provide all answers in the spaces provided. You are not allowed to use a calculator for this exam, but you may use molecular model kits. nly cyclohexane
More informationThird Midterm Exam CHEM 255 Organic Chemistry I Prof. Bastin November 19, 2009
Third Midterm Exam CEM 255 Organic Chemistry I Prof. Bastin November 19, 2009 Name Section Provide CLEAR, CONCISE answers using unambiguous, carefully drawn structures and arrows for all of the appropriate
More informationPreparation of Alkyl Halides, R-X. Reaction of alkanes with Cl 2 & Br 2 (F 2 is too reactive, I 2 is unreactive): R + X X 2.
Preparation of Alkyl alides, R-X Reaction of alkanes with Cl 2 & Br 2 (F 2 is too reactive, I 2 is unreactive): UV R + X 2 R X or heat + X This mechanism involves a free radical chain reaction. A chain
More informationOrganic Chemistry II (CHE ) Final Examination April 30, Name (Print legibly):
rganic hemistry II (E 232-002) Final Examination April 30, 2007 Name (Print legibly): (last) (first) PLEASE observe the following: You are allowed to have scratch paper (provided by me), and a simple model
More informationProblem session (3) Daiki Kuwana. Please fill in the blank and explain reaction mechanisms and stereoselectivities.
Problem session (3) Daiki Kuwana Please fill in the blank and explain reaction mechanisms and stereoselectivities. 1. 1-1 1. (Ac) 2 (10 mol%), DPEphos (20 mol%) Et 3, toluene, 90 C 2. s 4 (14 mol%), M;
More informationa) 1. O 3 2. (CH 3 ) 2 S
Name: 1 Chemistry 250B Final Exam December 19, 2008 Show non-zero formal charges on all atoms for all structures. There are 11 pages. 1. (42 pts) Complete the following reactions. Show the stereochemistry
More informationChem 14D Exam 1. Spring 2012 / Prof. Neil Garg. Friday, April 27, :00 1:50 PM. Page Possible Points Score bonus.
Chem 14D Exam 1 Spring 2012 / Prof. eil Garg Chem 14D Exam 1 P.1 Friday, April 27, 2012 1:00 1:50 PM General Instructions: This is a standard closed-note exam. Please read each question carefully and write
More informationStereoselective Organic Synthesis
Stereoselective rganic Synthesis Prabhat Arya Professor and Leader, Chemical Biology Program Dean, Academic Affairs, Institute of Life Sciences (An Associate Institute of University of yderabad Supported
More informationChem 2061 Final Exam. Fall Andy Aspaas, Instructor. Thursday, December 15, Instructions: Please print: Last name: First name:
Please print: Last name: First name: hem 2061 Final Exam Fall 2005 Andy Aspaas, Instructor Thursday, December 15, 2005 Instructions: You may start as soon as you arrive. The exam was designed to be finished
More informationThe aldol reaction with metal enolates proceeds by a chair-like, pericyclic process: favored. disfavored. favored. disfavored
The aldol reaction with metal enolates proceeds by a chair-like, pericyclic process: Z-enolates: M 2 M 2 syn 2 C 2 favored 2 M 2 anti disfavored E-enolates: M 2 2 C 3 C 3 C 2 favored 2 M M disfavored In
More informationCHEM 203. Midterm Exam 2 November 13, 2014 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Midterm Exam 2 ovember 13, 2014 Your name: ASWERS This a closed-notes, closed-book exam You may use your set of molecular models This document contains 7 pages Time: 1h 30 min 1. / 10 2. / 15 3.
More informationPartial Periodic Table
CEM 3311, Fall 2011 Professor Walba Third our Exam November 17, 2011 scores: 1) 20 2) 20 3) 20 4) 20 5) 20 100 CU onor Code Pledge: n my honor, as a University of Colorado at Boulder tudent, I have neither
More information1 a) Name the following substances with the used common names or according to IUPAC (4p): b) Draw detailed structures of the substances below.
EGLIS VERSI Exam rganic Chemistry 2 (KD1100) Wednesday May 21, 2008, 08.00-13.00 Allowed answering aid: molecular models Periodic system and tables of bond energies, pk a -values and MR-shifts are attached
More informationC 13 -C 14 C CHO. CrCl 2, Ni(COD) 2 4Å mol sieves. NHK reaction. nbuli HN(TMS) 2. aldol reaction
Introduction to Synthesis: Design (E 66) Spring 2015 Problem Set #2 KEY 1. The Evans synthesis of (+)-discodermolide appears in the Ph.D. thesis of David alstead (arvard, 1999). copy of this work is posted
More informationOrganic Chemistry Lecture 2 - Hydrocarbons, Alcohols, Substitutions
ALKANES Water-insoluble, low density C-C single bonds Higher MW -> higher BP, higher MP Branching -> lower BP, higher MP Forms cycloalkanes which can have ring strain Cyclohexane: chair vs. boat configuration
More information= ( 3 ) + 2 ( 3 ) = ( ) = = ( ) = 20 H H
Columbia University 92CORG12.DOC CEM S3443D Summer 1992 Professor Grace B. Borowitz Exam No. 2 June 17, 1992 Name: Grade: Please use a non-red pen. Answer questions in the provided space. If you write
More information[3,3]-Sigmatropic rearrangements
1 [3,3]-Sigmatropic rearrangements heat R 1 R 3 R 1 R 3 R 1 R 3 A class of pericyclic reactions whose stereochemical outcome is governed by the geometric requirements of the cyclic transition state Reactions
More informationApril 2002 CUME Organic Chemistry Department of Chemistry University of Missouri Columbia Saturday, April 6th, 2002 Dr.
April 2002 CUME Organic Chemistry Department of Chemistry University of Missouri Columbia Saturday, April 6th, 2002 Dr. Rainer Glaser Announced Reading: Prins Cyclization Reactions 1 Question 1. Aldol-Prins
More informationIf Compound 2 (below) was used in the above reaction, how might things change? Name Page 1. I. (23 points)
I. (2 points) ame Page itrogen atoms in amines can undergo substitution reactions repeatedly under mildly basic conditions. Provide the structure of the starting amine and supply the missing reagent(s).
More informationCHEM 203. Final Exam December 16, This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Final Exam December 16, 2014 Your name: This a closed-notes, closed-book exam You may use your set of molecular models This test consists of 10 pages Time: 2h 30 min 1. / 20 2. / 20 3. / 30 4.
More informationOlefin-Forming Reactions I
C549 R.M. Williams lefin-forming Reactions I The McMurry lefination Reaction. An important alternative to the acyloin condensation is the McMurry olefination which is a free radical coupling reaction initiated
More informationHOMEWORK PROBLEMS: ALKYNES. 1. Provide the complete IUPAC name for the following compounds:
CEM 31 MEWRK PRBLEMS: ALKYNES 1. Provide the complete IUPAC name for the following compounds: 2. When the compound below is treated with one equivalent of B 3, where does it react Explain. Where would
More informationExam III 17 August 2005 Name:
Chem 312 SS05 Page 1 of 6 Kantorowski Exam III 17 August 2005 Name: This exam contains 5 pages of questions confirm this once you begin. You will have 50 minutes An abbreviated Periodic Table can be found
More informationChiral Catalysis. Chiral Catalyst. Substrate. Chiral Catalyst
Chiral Catalysis Chiral (stoichiometric) reagents are a very important class of compound but... eed a stoichiometric quantity of the chiral component Unless it is cheap or recoverable this is not very
More informationChemistry 35 Exam 2 Answers - April 9, 2007
Chemistry 35 Exam 2 Answers - April 9, 2007 Problem 1. (14 points) Provide the products for the reactions shown below. If stereochemistry is important, be sure to indicate stereochemistry clearly. If no
More informationChem 251 Fall Learning Objectives
Learning Objectives Chapter 8 (last semester) 1. Write an electron-pushing mechanism for an SN2 reaction between an alkyl halide and a nucleophile. 2. Describe the rate law and relative rate of reaction
More informationHONORS ORGANIC CHEM. HAHS MRS. RICHARDS
NRS RGANIC CEM. AS MRS. RICARDS RGANIC CEMISTRY: FINAL EXAM REVIEW List of Topics: While the exam will specifically focus on material from Quarter 2, an understanding of several important concepts from
More informationName: CHEM 633: Advanced Organic Chem: Physical Problem Set 5 Due 11/10/17
ame: CEM 633: Advanced rganic Chem: ysical Problem Set 5 Due 11/10/17 Please do not look up references until after you turn in the problem set unless otherwise noted. For the following problems, please
More informationKinetic Resolutions. Some definitions and examples Resolution: A process leading to the separation of enantiomers, or derivatives thereof.
Material outline: For the Scientist in you: Definitions Theoretical treatment Kinetic esolutions General eferences: Vedejs, ACIEE, 2005, 3974 Jacobsen, Adv. Syn. Cat. 2001, 5 Kagan, Topics in Stereochemistry,
More informationName: Student Number: University of Manitoba - Department of Chemistry CHEM Introductory Organic Chemistry II - Term Test 1
Name: Student Number: University of Manitoba - Department of Chemistry CHEM 2220 - Introductory Organic Chemistry II - Term Test 1 Thursday, February 11, 2016; 7-9 PM This is a 2-hour test, marked out
More informationFirst 2-Hour Exam. By printing your name below, you pledge that
Chem 3331 Fall 2004 Exam # 1 1 Name First 2-our Exam By printing your name below, you pledge that "n my honor, as a University of Colorado at Boulder student, I have neither given nor received unauthorized
More informationNucleophilic Substitution and Elimination
Nucleophilic Substitution and Elimination Alkyl halides react with a nucleophile in one of two ways. Either they eliminate an X to form an alkene, or they undergo a substitution with the nucleophile, Nu,
More informationMolybdenum-Catalyzed Asymmetric Allylic Alkylation
Molybdenum-Catalyzed Asymmetric Allylic Alkylation X MoL n u u * Tommy Bui 9/14/04 Asymmetric Allylic Alkylation from a Synthetic Viewpoint X X M u u * and/or u form a C-C bond with the creation of a new
More informationRenaud Group Exercise Set
Renaud Group Exercise Set Prepared by ick Tappin 08/07/16 Spectroscopy 1. Deduce the structures for compounds A, B, and C C 6 10 3 A IR: 1745 and 1720 cm -1 13 C-MR: δ 208, 172, 51, 37, 32, and 27 ab 4
More informationChapter 2 The Elementary Steps in TM Catalysis
hapter 2 The Elementary Steps in TM atalysis + + ligand exchange A oxidative addition > n + A B n+2 reductive elimination < B n n+2 oxidative coupling + M' + M' transmetallation migratory insertion > (carbo-,
More informationLewis Base Catalysis: the Aldol Reaction (Scott Denmark) Tom Blaisdell Friday, January 17 th 2014 Topic Talk
Lewis Base Catalysis: the Aldol eaction (Scott Denmark) Tom Blaisdell Friday, January 17 th 2014 Topic Talk Scott E. Denmark 1975 - S.B. in Chemistry MIT (ichard. olm and Daniel S. Kemp) 1980 - D.Sc in
More informationCHEMISTRY Topic #8: Oxidation and Reduction Reactions Fall 2018 Dr. Susan Findlay
CEMISTRY 2600 Topic #8: xidation and Reduction Reactions Fall 2018 Dr. Susan Findlay xidation States of Carbon Carbon can have any oxidation state from -4 (C 4 ) to +4 (C 2 ). As a general rule, increasing
More informationSynthetic possibilities Chem 315 Beauchamp 1
Synthetic possibilities hem Beauchamp Propose reasonable syntheses f the following target molecules (TM-#). You can use the given starting materials and any typical ganic reagents studied in our course
More informationName: Student Number: University of Manitoba - Department of Chemistry CHEM Introductory Organic Chemistry II - Term Test 1
Name: Student Number: University of Manitoba - Department of Chemistry CHEM 2220 - Introductory Organic Chemistry II - Term Test 1 Thursday, February 12, 2015; 7-9 PM This is a 2-hour test, marked out
More informationPartial Periodic Table
Printed ame: CEM 3371, Spring 2015 Professor Walba First our Exam March 10, 2015 CU onor Code Pledge: n my honor, as a University of Colorado at Boulder Student, I have neither given nor received unauthorized
More informationLearning Guide for Chapter 15 - Alcohols (II)
Learning Guide for Chapter 15 - Alcohols (II) I. Introduction to alcohol reactivity II. Reactions of alcohols with acids III. Reactions of alcohols with electrophiles alogenated phosphorus and sulfur compounds
More informationc. Oxidizing agent shown here oxidizes 2º alcohols to ketones and 1º alcohols to carboxylic acids. 3º alcohols DO NOT REACT.
Exam 1 (Ch 17 and Review of CEM 331) Answer Key: 1. ne-step Questions: You need to know reagents for reagent arrows and to be able to draw products. I know a lot of them seem to look alike its your job
More informationTotal Syntheses of Minfiensine
Total Syntheses of Minfiensine Douany, A. B.; umphreys, P. G.; verman, L. E.*; Wrobelski, A. D., J. Am. Chem. Soc. 2008, ASAP. D: 10.1021/ja800163v Shen, L.; Zhang, M.; Wu, Y.; Qin, Y.*, Angew. Chem. nt.
More informationdiene. If stereoisomeric mixtures form, indicate by drawing one and writing "+ enantiomer" and/or "+ diastereomer" in the box.
I. (9 points) Page A. Consider how varying the conditions of a reaction can vastly influence the rate of a reaction as well as the product(s) formed. First draw the product(s) that form in the reference
More informationName: Student Number: University of Manitoba - Department of Chemistry CHEM Introductory Organic Chemistry II - Term Test 1
Name: Student Number: University of Manitoba - Department of Chemistry CEM 2220 - Introductory Organic Chemistry II - Term Test 1 Thursday, February 16, 2012; 7-9 PM This is a 2-hour test, marked out of
More informationI will not accept answers on scratch paper
Final Exam March 19, 2013 rganic Chemistry 335 I will not accept answers on scratch paper This exam is 110 minutes long (8-9:50). I will post a key on D2L when I have all the exams back. There will be
More informationTHE UNIVERSITY OF CALGARY FACULTY OF SCIENCE FINAL EXAMINATION CHEMISTRY 350
Page 1 of 16 TE UNIVERSITY F CALGARY FACULTY F SCIENCE FINAL EXAMINATIN CEMISTRY 350 April, 1997 Time: 3 ours PLEASE WRITE YUR NAME, STUDENT I.D. NUMBER AND SECTIN NUMBER (01 for MWF lectures and 02 for
More informationCHEM 8A Summer Student ID # Organic Chemistry EXAM 2 (300 points)
CEM 8A Summer 2017 UCSC, Binder Name Student ID # rganic Chemistry EXAM 2 (300 points) In each of the following problems, you will use your knowledge of organic chemistry conventions to answer the questions
More informationCH 3 OCH 3. Question 4. Provide the missing reactants for the following Diels-Alder reaction. heat
CHEMISTRY 234, MIDTERM #2 PRACTICE TEST #1-3 - NAME Question 3 For each reaction 1) Provide the missing reagents/conditions or major organic products as appropriate 2) State whether the OVERALL reaction
More information