Exam211_answers - Exam # 2 Chemistry 2401 March 17, 2011...

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Exam # 2 Chemistry 2401 – March 17, 2011 (12 ) I. Name each of the following including stereochemical designation when that is appropriate. A. H C Br CH 3 2 CH 2 CH 2 CH 3 B. Cl CH 2 CH 3 H H C. 2 3 3 H H H 3 R-2-bromohexane trans-1-chloro-3-ethylcyclopentane 3-methylpentane (28) II. Draw structural formulas for each of the following as instructed. A. The two chair conformations for trans-1-bromo-2-isopropylcyclohexane. The two conformations should be shown viewed from the same perspective. Circle the more stable conformation. CH CH 3 CH 3 Br H H CH CH 3 CH 3 H H B. Draw a Newman projection of the C. What are the stereochemical designations (R & S) following around the indicated bond. for the two stereogenic centers in the compound in B. Assume numbering is left to right. Cl Cl H H CH 2 CH 3 H Cl CH 2 CH 3 Cl H D. Which of the following compounds can exist as a meso compound? Draw a 3-D structure of this meso compound and identify the stereochemical designations (R & S) for the stereogenic centers. 2,3-dichloropentane – ends are different 2,3-dichlorobutane 2,3-dimethylbutane – no chiral center 2,3-dimethylpentane – only one chiral center E. Draw the transition state for the
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This note was uploaded on 03/06/2012 for the course CHEMISTRY 90262 taught by Professor Mccord during the Spring '09 term at University of Central Arkansas.

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Exam211_answers - Exam # 2 Chemistry 2401 March 17, 2011...

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