chez 301 test 2 spring 07 version 1 answers

chez 301 test 2 spring 07 version 1 answers - 1"Version 1...

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Name: ___________________________ Lab TA: ___________________________ CHEZ 301 Organic Lab Test April 18, 2007 For each of the following questions, mark the correct answer on the answer sheet. Each correct answer is worth 4 (four) points. The following information should be used to answer questions 1 through 4: In the lab, a racemic mixture of phenylsuccinic acid was resolved to give a sample of (+)-phenylsuccinic acid. The general procedure was as follows: A racemic mixture of phenylsuccinic acid was dissolved in isopropyl alcohol. (-)-Proline was added and the mixture was heated at reflux for 30 minutes. The reaction mixture was cooled to 30 o C. Compound A was collected by filtration and washed with acetone. The solid was dried well and added to cold 6 M HCl. The resulting solid ( Compound B ) was collected by filtration and washed with water. 1. What would be the specific rotation of the racemic mixture of phenylsuccinic acid? a. 0 o * b. +86.5 o c. -86.5 o d. +173 o e. -173 o 2. What was the purpose of the (-)-proline? a. to convert all of the (-)-phenylsuccinic acid to (+)-phenylsuccinic acid b. to convert all of the (+)-phenylsuccinic acid to (-)-phenylsuccinic acid c. to selectively crystallize the (+)-phenylsuccinic acid “bis salt”, leaving the (-)-phenylsuccinic acid (or its “bis salt”) in solution * d. to selectively crystallize the (-)-phenylsuccinic acid “bis salt”, leaving the (+)-phenylsuccinic acid (or its “bis salt”) in solution 3. What is the identity of Compound A ? a.
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This test prep was uploaded on 04/18/2008 for the course CHEZ 301 taught by Professor Moses during the Spring '07 term at VCU.

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chez 301 test 2 spring 07 version 1 answers - 1"Version 1...

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