8B-handout-feb4

8B-handout-feb4 - Chem 8B, Handout for Feb 4, 2009 Organic...

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Chem 8B, Handout for Feb 4, 2009 Organic Oxidation and Reduction reactions (pp 269-270, 329), and Imines (pp 331-332) Oxidation = add oxygen by converting C-H bond into a C-O bond (increase # of C-O bonds) Reduction = add hydrogen by converting C-O bond into a C-H bond (reduce # of C-O bonds) Reducing agents add H 2 , or a hydride (H: ) to increase the number of C-H bonds. Examples of chemical reducing agents used with carbonyls are NaBH 4 and LiAlH 4 . (see page 329). There are also enzymes that can add H 2 to reduce a carbonyl. Examples of chemical oxidizing agents include O 2 , chromium reagents (such as CrO 3 , H 2 CrO 4 , and Na 2 Cr 2 O 7 ), and AgNO 3 . Notice a trend? They all have lots of oxygen atoms in the reagents. In addition to chemical reagents, enzymes can also perform oxidation reactions. Metabolic oxidation reactions are some of the most important reactions that occur in biological systems. We have already examples of biological oxidations with the enzyme cytochrome p450 (pages 280-281), but there are other enzymes that can also oxidize compounds. For example, alcohol dehydrogenase is an important enzyme that can
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This note was uploaded on 03/12/2009 for the course CHE 8B taught by Professor Lievens during the Winter '07 term at UC Davis.

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8B-handout-feb4 - Chem 8B, Handout for Feb 4, 2009 Organic...

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