SasakiFINAL - CHEM 239U Spring, 2005 Prof. Sasaki FINAL...

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CHEM 239U Spring, 2005 FINAL EXAM Name . Prof. Sasaki 175 points TOTAL Good Luck! Note: Only answers in the box will be graded. ________________________________________________________________________ 1. (35) (a) Circle all the isoprene units in each of the following naturally occurring substances: ( i ) ( i i ) O O H 3 C O CH 3 O (b) Cerebrosides are found in the brain and in the myelin sheath of nerve tissue. The structure of the cerebroside phrenosine is; O OH H O H H OH H OH CH 2 OH H CH 2 C C OH H C H C H CH 3 (CH 2 ) 11 CH 2 H H N C C H O CH 2 (CH 2 ) 20 CH 3 OH (i) Is phrenosine an α - or a β -glycoside? (ii) Hydrolysis of phrenosine gives a mixture of an hexose, a fatty acid called cerebronic acid , and a compound called sphingosine . Write the structural formula for all three hydrolysis products. Hexose cerebronic acid sphingosine
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CHEM 239U page 2 Name . 2. (35) When alanine is treated with dicyclohexylcarbodiimide (DCC), a 2,5- diketopiperazine is formed. H
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This test prep was uploaded on 04/15/2008 for the course CHEM 239 taught by Professor Sasaki during the Spring '06 term at University of Washington.

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SasakiFINAL - CHEM 239U Spring, 2005 Prof. Sasaki FINAL...

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