2009-exam2-key - Chemistry 322a Exam No 2 Please Print Key...

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Chemistry 322a Exam No. 2 October 14, 2009 Please Print Last name First name First four digits of USC ID Name of TA (1) (6) Grader (2) (15) (3) (16) (4) (10) (5) (5) (6) (12) First letter of last name Total (125) (7) (15) (8) (18) Please note that there is a scratch sheet for your use in the back. Detach and use it. Do not submit. Key (9) (12) (10) (16)
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Last name - Page 2 - 4. Circle the correct stereochemistry, R, S, or N/A or E, Z, or N/A. (10 pts) 1. A student in Jung's research group synthesized a compound whose observed specific rotation was measured to be + 20°. Its pure (S)-enantiomer shows specific rotation of - 50°. How many percent of this synthesized compound was the (S) enantiomer? (6 pts.) % of the (S) enantiomer 2. Circle the c h i r a l molecules. Wrong answers will be subject to loss of points. (15 pts.) 3. Show the configurational relationship between two compounds by circling only one out of I for identical, D for diastereomers, and E for enantiomers (16 pts.) R o r S o r N / A HO 30% Br Br H H Br Br C Cl Cl CO 2 H Br HO OH Br CO 2 H 3a. I D E 3 pts each, w/ 2 pts loss on wrong
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