CHEM 203. Final Exam December 18, 2013 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
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1 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. / / / / / / / / 40 TTAL / 250 = / 100 This exam counts for 37.5% of your CEM 203 grade
2 Chem 203 final exam p. 2 of (20 pts.) The reagents shown below have not been discussed in class, but they are structurally related to reagents that have been covered in CEM 203. n the basis of structural analogy, indicate the probable use of each of them (write your answers in the boxes): a. probably used as/for: radical inhibitor c. I P I I P I probably used as/for: conversion of prim. / sec. alcohols into alkyl iodides C 3 b. CF 3 epoxidation of alkenes d. NC N N CN radical initiator 2 (20 pts) Check the appropriate box to indicate whether the following statements are true or false: true false a. An aqueous solution of 2 Cr 4 and 2 S 4 oxidizes primary alcohols to aldehydes and secondary alcohols to ketones b. An alkene will form the same epoxide upon treatment with either Br 2 and 2 followed by base, or with MCPBA c. Rearrangements may occur during S N 1 reactions, but not during S N 2 reactions d. Rearrangements may occur during E2 reactions, but not during E1 reactions e. Carbocations may add to alkenes f. Radicals do not rearrange by the 1,2-shift mechanism typical of carbocations g. A C Si bond provides more effective hyperconjugative stabilization than a C C bond h. A bromohydrin is easily converted into a Grignard reagent upon reaction with metallic Mg i. An acetal is a special type of ether j. The Fischer-Kiliani synthesis of monosaccharide involves the addition of CN to an aldehyde
3 Chem 203 final exam p. 3 of (30 pts.) Check the appropriate boxes to indicate whether: a. The following carbohydrates belong to the D or the L series: C C C C D- L- D- L- D- L- D- L- D- L- C b. The following carbohydrates possess the α- or the β-anomeric configuration: α- β- α- β- α- β- α- β- c. The following derivatives of glucose are reducing or nonreducing: C 3 C 3 C 3 C3 C 3 C 3 C 3 C3 C 3 C 3 C 3 reducing nonreducing C 3 C 3 C 3 reducing nonreducing
4 Chem 203 final exam p. 4 of (30 pts) In the appropriate box, draw the structure of: a. A carbocation that forms as the major product of protonation of an alkene and that is likely to undergo rearrangement, and one that also forms as the major product of protonation of an alkene, but that is not likely to undergo rearrangement: likely to rearrange unlikely to rearrange b. A trans-alkene that gives a chiral product upon reaction with 2 and a trans-alkene that gives an achiral product upon reaction with 2 : gives a chiral product gives an achiral product c. An alkyl halide that is likely to undergo substitution by the S N 2 mechanism, and one that is likely to undergo substitution by the S N 1 mechanism: reacts by S N 2 reacts by S N 1 I
5 Chem 203 final exam p. 5 of 10 d. An alkene that is a good substrate for allylic bromination, and one that is a poor substrate for the same reaction: good substrate poor substrate only 1 mono-bromo isomer can form multiple mono-bromo isomers can form e. An alkyne containing at least 3 carbon atoms, that produces an achiral diol when treated with 2 and Lindlar catalyst, followed by s 4 and then aqueous NaS 3, or when treated with Na in liquid N 3, followed by MCPBA and then aqueous 2 S 4, and an alkyne also containing at least 3 carbon atoms that produces a chiral diol when treated under the same conditions: produces an achiral diol produces a chiral diol f. An alcohol that gives the same product when treated either with PCC or with the Jones reagent, and one that gives two different products under the same conditions: gives the same product gives two different products
6 Chem 203 final exam p. 6 of (30 pts) Write accurate mechanisms for the following known reactions: a. S S S b. C 4, radical initiator, heat + C 3 R R heat 2 R C 3 C 3 3 C C 3 3 C c. ± + cat. 2 S 4 2 S 3 S 3 ± + 2
7 Chem 203 final exam p. 7 of (40 pts.) Draw the structure of the major product expected from the following reactions (write your answer in the boxes). If no change is predicted, answer "N REACTIN." a. 1. NaB 4, then mild Br 2 3. K b. 1. Br, rad. initiator 2. NaN 3 3. Zn, + no reaction c. 1. B 3, then 2 2, aq. Na 2. PBr 3 3. Mg 4. C 2, then mild 3 + C d. 1. 2, hν 2. K 3. MCPBA 4. Na then mild 3 + e. 1. 3, then Zn, + 2. C 3 MgBr 3. 2 S 4, 160 C 4. Br 2 and 2 5. Na
8 Chem 203 final exam p. 8 of (40 pts.) Indicate all the reagents, catalysts, etc., in the correct order, that are necessary to induce the transformations shown below. List such reagents above / below the reaction arrows. NTE: aqueous workups are understood and do not need to be shown. a. 1. Ts, pyridine SC 3 2. C 3 SNa b. 1. 2, hv 2. tert-buk 3. MCPBA C 3 4. aq. 2 S 4 5. Na, C 3 I C 3 c. 1. MCPBA 2. C 3 Na 3. Ts, pyridine C 3 4. NaN 3 5. Zn, + N 2 d. 1. 2, Lindlar 2. B , aq. Na 4. PCC e. 1. NBS, hv 2. C 3 Li, CuBr 3. NBS, hv 4. -C C Na + f. g. 1. 2, hv 2. tert-buk 3. 3, then Zn / + 4. NaB 4 5. Ts, pyridine 6. Na 2 S 1. PBr 3 2. C 3 -C Na + S h. 1. -C C Na , Lindlar catalyst 3. MCPBA 4. NaN 3 followed by Zn / + N 2
9 Chem 203 final exam p. 9 of (40 pts.) Propose a good synthesis of the molecules shown below using only methanol, acetylene and ethylene oxide (see below) as the sources of carbon atoms. Intermediates / products obtained during an earlier sequence may be employed in a subsequent procedure. Assume the availability of all necessary reagents (such as bases, acids, B 3, Mg, Ts, PCC, PBr 3, MCPBA, etc.). methanol: C 3 acetylene: C C ethylene oxide: 2 C C 2 Important: i. Aqueous workups at the end of each reaction are understood and need not to be shown. ii. It is not necessary to write mechanisms. a. Jones reagent 2 Pd C 3 I NaN 2 C 3 I NaN 2 Na + C 3 Na + b. 2 Lindlar Na + part a. Br C 3 part a. 2 NBS Mg Br 2 Lindlar hv Br MgBr CuBr
10 Chem 203 final exam p. 10 of 10 c. C 3 C 3 cat. 2 S 4 2 C 3 + PCC Br Br Mg MgBr part b. CuBr d. s 4, then aq. NaS 3 2 Lindlar I C 2 C 2 -I Na + part a. NaN 2 Na + C 2 =C 2 2 Lindlar appy olidays!
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