practice_exam_Practice Exam 2_KEY

practice_exam_Practice Exam 2_KEY - Chem 237 Exam 2...

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Chem 237 Exam 2 November 22, 2006 Instructions: You will have 50 minutes to complete as many problems as possible. Where provided, write your answers in the boxes. Your answers will not be graded unless they are in the proper box. Problem Points 1 ____/10 2 ____/7 3 ____/28 4 ____/8 5 ____/16 6 ____/6 7 ____/10 8 ____/15 Total ____/100
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1. For each of the following reactions, draw the carbocation intermediate you would expect in each reaction. Circle the starting material that reacts faster. 10 pts intermediate major product intermediate major product HBr HBr + Br + Br 2. Zidovudine (AZT) (drawn below) is an important anti-HIV medication. 7 pts a. Identify all chirality centers in the molecule with arrows. b. How many total stereoisomers are possible? c. Formal charges are missing from the structure. Draw them in the proper locations. O HO N N N N H N O O + _ (N.B. The nitrogens in the six membered ring are not stereocenters, but we have not covered that yet. No points were penalized for identifying them as such.)
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3. Fill in the boxes with the appropriate reagents and/or products.
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practice_exam_Practice Exam 2_KEY - Chem 237 Exam 2...

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