Exam Review - Chapter 7

Carbonyl group has formed a covalent bond with oxygen

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Unformatted text preview: isomers depends on the chiral center farthest from the carbonyl carbon Fischer projection formulas: 3- D sugar structures on paper Epimers: two sugars that differ only in the configuration around one carbon atom Aldotetroses and monosaccharides with five or more carbon atoms in the backbone occur as cyclic structures in which the carbonyl group has formed a covalent bond with oxygen of ahydroxyl gropu along the chain Hemiacetals and hemiketals: the result of a general reaction between alcohols and aldehydes or ketones Addition of one alcohol molecule leads to formation of hemiacetal/hemiketal Can attack from front or behind to generate α or β conformations Addition of second alcohol leads to full acetal/ketal Anomers: isomeric forms of monosaccharides that differ only in their configuration about th ehemiaetla or hemiketal carbon atom Anomeric carbon: carbonyl carbon Two sugar molecules can be joined via glycosidic bond between two nanomeric carbons Two acetal groups and no hemiacetals No reducing ends Pyranoses: six- membered ring compounds Converting Fischer Projects into Haworth perspective formulas 1. Draw six- membered carbon ring, numbering 1 to anomeric carbon 2. Hydroxyl group on the right is placed pointing down; if left, pointing up 3. –CH2OH pointing up f...
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This note was uploaded on 02/06/2014 for the course BCHB 501 taught by Professor Jessicajones,elliottcrooke,ericgalsgow,marybethmartin during the Fall '12 term at Georgetown.

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