KAHR exam3 - CHEM 337 SPRING 2006 EXAM 3 1._...

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CHEM 337 SPRING 2006 EXAM 3 1._ _2.___3.___4.___5.___6.___7.___8.___9.___TOTAL SCORE_________ NAME_______________________________________________________ 1a. (8 pts) Which of the following represents tyrosine at a pH = 12? 1b. Which of the following represents serine at a pH = 1?
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R configuration. Draw the Fischer projection and then a chair representation of ! -D-allose showing all hydroxyl groups with the correct stereochemistry. CHO OH H OH H OH H OH H CH 2 OH O H HO OH H H H OH H OH OH 3 (16 pts). Determination of the absolute configuration of (+)-lactic acid (CH 3 CHOHCO 2 H) goes as follows: D-(+)-glyceraldehyde (HOCH 2 CHOHCHO) was oxidized to optically active glyceric acid (HOCH 2 CHOHCO 2 H). The glyceric acid was reduced to (-)-lactic acid. Trace the course of the reactions using the Fischer convention, and deduce the absolute configuration of the (+)-lactic acid. If you don’t know the right configuration of D-(+)-glyceraldehyde, guess. And, then be consistent thereafter like Fischer. COOH
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This test prep was uploaded on 04/15/2008 for the course CHEM 237 taught by Professor Andersen during the Fall '08 term at University of Washington.

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KAHR exam3 - CHEM 337 SPRING 2006 EXAM 3 1._...

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