Practice_Exam_3_Key

Practice_Exam_3_Key - Page 1 PRACTICE EXAM KEY Spring 2008...

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Page 1 PRACTICE EXAM KEY Spring 2008 Exam 3 – CH 0320 NAME ___________________________________ I’m READY!
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Page 2 1. Give an example for each description. Use Fisher, Haworth, or conformational representations. a) An aldopentose: CHO OH H OH H H HO CH 2 OH b) A ketohexose: CH 2 OH O OH H H HO OH H CH 2 OH c) Methyl β -D-ribopyranoside: O OH OCH 3 OH OH d) L-xylose: CHO HO H OH H H HO CH 2 OH e) Xylitol CH 2 OH OH H H H O OH H CH 2 OH f) Any reducing sugar: A ketose or an aldose, open or closed form.
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Page 3 2. Provide products for each of the following transformations. H O CHO OH H OH H H HO OH H CH 2 OH CHO H HO H HO H OH OH H CH 2 OH CHO H HO H HO CH 2 OH CHO H HO H HO CH 2 OH HNO 3 /H 2 O HS SH BF 3 NHNH 2 HCN Br 2 /H 2 O CO 2 H H HO H HO CH 2 OH H HO H HO CH 2 OH CN H OH CO 2 H H HO H HO H OH OH H CO 2 H NN(H)C 6 H 5 OH H H HO OH H CH 2 OH NN(H)C 6 H 5 S S H HO H HO CH 2 OH CN HO H a b c d e f 2 equivalents H O O H CH 3 NH 2 /H + Mannich C 7 H 13 NO N H CH 3 O
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Page 4 3. For each of the following transformations, provide mechanisms. (8 points each)
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Practice_Exam_3_Key - Page 1 PRACTICE EXAM KEY Spring 2008...

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