E4,241b,S06 - EXAM 3 CHEMISTRY 241b April 27, 2006 Dr....

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EXAM 3 CHEMISTRY 241b April 27, 2006 Dr. Spurgeon ANSWER KEY __________________________________________________________________________________________ 1. (19 points) Answer the following questions about sugars. a. (3pts. ea.) Provide either the Fischer projection or the name for each sugar: b. (10 pts) Convert the following cyclic forms to their representative open-chain Fischer projection and then name the open-chain form: D-Arabinose O H HO H HO OH OH H H H OH L-Gulose OH H H HO OH H H O H HO CH 2 OH O H HO OH H OH H H H H OH CHO H HO OH H OH H CH 2 OH α -D-Mannose CHO HO H HO H H OH HO H CH 2 OH CHO OH H OH H OH H OH H CH 2 OH D-Allose D-Arabinose CHO H HO OH H OH H CH 2 OH
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2. (23 points) Use the Kiliani-Fischer synthesis to show how Emil (this is what his friends called him!) prepared D-xylose and D-lyxose from their parent sugar. Fill-in the ‘cyclobutanes’ below with requisite starting material, reagent(s), and/or products; and fill-in the lines with the appropriate name.
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E4,241b,S06 - EXAM 3 CHEMISTRY 241b April 27, 2006 Dr....

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