E4,241b,S05 - EXAM 4 CHEMISTRY 241b April 28, 2005 Dr....

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EXAM 4 CHEMISTRY 241b April 28, 2005 Dr. Spurgeon ANSWER KEY __________________________________________________________________________________________ 1. (10 points) Match the name with the correct sugar structure. 2. (6 points) Circle the structure(s) below that represent D-erythrose : a -D-Idopyranose a -D-Glucopyranose b -D-Mannofuranose b -D-Fructofuranose b -D-Arabinofuranose O OH H OH H OH OH H H H OH O H HO H HO H OH OH H H OH H OH H H H HO OH O HO H HO CH 2 OH OH H O CH 2 OH H OH H OH H OH H O CH 2 OH H OH H OH H CH 2 OH O HO H H HO H OH O OH OH H H HO CHO H H OH CH 2 OH CHO H HO OH H OH H CH 2 OH
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3. (12 points) Draw the following sugars in their open-chain Fischer projection forms. 4. (10 points) For the sugars in question 3 provide the products from HIO 4 degradation (oxidative cleavage). Is it possible to distinguish any of these sugars using this method? Which sugars, if any, are distinguishable? H OH H HO H H OH O HO H OH O H HO OH H H H OH H OH OH Sugar 1 Sugar 4 Sugar 3 Sugar 2 CH 2 OH OH H O CH 2 OH H OH H OH O H HO OH H H H OH H OH H Sugar 1 Sugar 2 Sugar 3 Sugar 4 Products CHO OH H OH H OH H CH
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This note was uploaded on 12/09/2009 for the course CHEM UNIVERSITY taught by Professor Spurgen during the Spring '09 term at University of Arizona- Tucson.

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E4,241b,S05 - EXAM 4 CHEMISTRY 241b April 28, 2005 Dr....

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