Exam 3 FS03 - CEM 351 3rd EXAM/Version A Friday, November...

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CEM 351 3rd EXAM/Version A Friday, November 21, 2003 1:50 – 2:40 p.m. Room 138, Chemistry Name (print) Key Signature Student # Section Number Grade? . 1.(20 pts.) . 2.(20 pts.) . 3.(20 pts.) . 4.(20 pts.) . 5.(20 pts.) . 6.(20 pts.) TOTAL 100 pts.) Score Note: Answer any 5 questions for a total score of 100 pts. Be sure to look over all the questions first before beginning the exam, and indicate which five questions are to be graded by checking the corresponding box. Recitation Day and Time Instructors: Room 1. T 9:10-10:00 a.m. Yu Zhang 323 2. M 10:20-11:10 a.m. Yu Zhang 218A 3. T 10:20-11:10 a.m. Tulika Datta 220 4. Th 10:20-11:10 a.m. Tulika Datta 220 5. T 10:20-11:10 a.m. Yu Zhang 323 6. T 11:30-12:20 p.m. Tulika Datta 218B 7. Th 11:30 - 12:20 Tulika Datta 323 8. M 4:10-5:00 p.m. Yu Zhang 136
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2 1. (4 pts each; 20 total) Draw 3D representations of the products expected from the following Diels-Alder reactions in the boxes provided. Don’t forget about the endo preference: O O O O O O NC t-Bu t-Bu CN CF 3 CF 3 NC CN t-Bu t-Bu (a) (b) (c) (d) CF 3 CF 3 CN CN t-Bu t-Bu CN CN t-Bu t-Bu or CN NC t-Bu or t-Bu CN NC t-Bu t-Bu (e) Recalling that “t-Bu” stands for the tertiary butyl group, -C(CH 3 ) 3 , explain why the reaction shown in (c) is fine, but the one in (d) would, in fact, almost certainly not
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Exam 3 FS03 - CEM 351 3rd EXAM/Version A Friday, November...

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