Marking Scheme For The Exam QUESTION #
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1 Chemistry 2420 S10 Spring 2005 Term Exam #2 110 Minutes Name: Student Number Marking Scheme For The Exam QUESTIN # TTAL 100 % Question (6 Marks) A. Provide the structures of the following compounds: o-chlorophenyl 3-methyl-4-oxopentanoate N-ethyl, N-methyl m-(1-cyanopropyl)benzamide B. Which compound would be the best solvent to use for a Friedel-Crafts acylation process? toluene nitrobenzene aniline C. Which compound would react with benzaldehyde to form an imine (after loss of water)? propylamine diethylamine trimethylamine D. Which compound would not react with ethanoyl chloride to form an amide? propylamine diethylamine trimethylamine E. Which compound would react with cycloheaxanone to form an enamine (after loss of water)? propylamine diethylamine trimethylamine
2 Question (14 Marks) A. This question is based upon the following cyclic structures. Each letter may be used once, more than once, or not at all. Each question has only one correct answer. (10) 3 C A B C D 3 C E Would give a positive Tollen s and a positive 2,4-DNP test A B C D E Would give a negative Tollen s and a positive 2,4-DNP test A B C D E Would give a positive Iodoform test after reaction with 3 + A B C D E Would produce C 2 upon heating with 3 + A B C D E Would require 2 equivalents of MeMgBr A B C D E Would require 3 equivalents of MeMgBr A B C D E Would not react with MeMgBr A B C D E Would undergo saponification with Na(aq) A B C D E Would undergo mutarotation A B C D E Would be classified as a deoxy ketose A B C D E B. Indicate the number of D atoms (in the box to the right) that each of the following compounds would incorporate after stirring with NaD in D 2 until no further changes took place. (2) C. Which compound would lose C 2 at the lowest temperature? (1) C 2 C 2 C 2 D. Which compound is the least likely to exist in Nature? (1) N
3 Question 3. (15 Marks) A. Provide the identity of the reagents necessary for the following reactions. (9) 3 C A B C C 2 C2 Br C 2 N 2 N 2 N 2 N 2 D E F Li NMe 2 G I A: B: C: D: E: F: G: : I: B. Identify (by a single letter there may be more than one example) which of the above reactions would be classified as a(an): (6) electrophilic aromatic substitution free radical substitution nucleophilic acyl substitution oxidation nucleophilic aliphatic substitution nucleophilic addition
4 Question 4. (15 Marks) Provide the structures of all carbon-containing products formed in each of the following reactions. You may assume that each reaction goes to completion and you have excess reagent (if necessary) unless otherwise specified. Be careful with the possibility of acid/base transfer in the products. C 2 + MeN 2 LiAl Na(aq) N C N MeMgBr 3 + C 2
5 Question 5. (15 Marks) Provide the structures of all carbon-containing products formed in each of the following reactions. You may assume that each reaction goes to completion and you have excess reagent (if necessary) unless otherwise specified. Be careful with the possibility of acid/base transfer in the products. 3 + N LiAl 4 heat 3 + Me 2 N MeMgBr (1 equiv) (1 equiv) N 4 CN S 3 + heat S I 2 K(aq) Se Ph 2 2 heat
6 Question 6. (15 Marks) Provide the structures of the products formed in the following reactions. - warm 2 (loss water) (intramolecular) D 2 / - D warm D added (loss water) dropwise LDA Me 3 Si F - Ph 3 P + - C heat + LDA warm (loss water)
7 Question 7. (8 Marks) A. Briefly explain why (using words and a mechanistic arrow-pushing approach) why the following reaction will not work as written. (4) B. In the following process, the initially formed intermediate has 3 different resonance structures while the last intermediate in the process has 2 resonance structures. Provide their structures in the boxes below. (4) 2 + +
8 Question 8. (12 Marks) Compound A (C N) has a sharp band near 1700 cm -1 and a strong band near 3400 cm -1 in the IR. Compound A can hydrolyzed by heating with aqueous acid to produce compound B (C ) which has one sharp band in the IR near 1700 cm -1 plus a broad band in the 2500 to 3200 cm -1 region. Treatment of the aqueous filtrate with base gives compound C (C 3 9 N) that has a strong odour and a strong IR band around 3400 cm -1. Reaction of compound B with hot acidic KMn 4 gave compound D (C ) that has a sharp band in the IR near 1700 cm -1. The 1 NMR spectra of compounds B and C are shown. Provide the structures of compounds A, B, C and D. A: B: C: D:
Marking Scheme For The Exam QUESTION #
Chemistry 2420 S10 Spring 2005 Term Exam #1 110 Minutes ame: Student umber Marking Scheme For The Exam QUESTI # 1 2 3 4 5 6 7 8 6 12 14 14 13 39 12 9 TTAL 119 % Question 1. (6 Marks) Under mildly acidic
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