310_24 - Organic Lecture Series CH 310 N LECTURE 24...

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Organic Lecture Series 1 CH 310 N LECTURE 24 Textbook Assignment: Chapter 25-Carbohydrates Homework (for credit): Problem Set – 8 Posted Today’s Topics: Intro-Nomenclature, classification Notice & Announcements: EXAM 3- Grading in Progress Organic Lecture Series 2 Carbohydrates Carbohydrates
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Organic Lecture Series 3 Carbohydrate: Carbohydrate: a polyhydroxyaldehyde, a polyhydroxyketone, or a compound that gives either of these compounds after hydrolysis Organic Lecture Series Monosaccharide: Monosaccharide: a carbohydrate that cannot be hydrolyzed to a simpler carbohydrate –they have the general formula C n H 2n 2n O n ; C n (H (H 2 O) O) n n where n varies from 3 to 8. –will use –ose ose in the suffix aldose: aldose: a monosaccharide containing an aldehyde group ketose ketose : a monosaccharide containing a ketone group Carbohydrates Carbohydrates
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Organic Lecture Series 5 • Monosaccharides are classified by their number of carbon atoms Hexose Heptose Octose Triose Tetrose Pentose Formula Name C 3 H 6 O 3 C 4 H 8 O 4 C 5 H 10 O 5 C 6 H 12 O 6 C 7 H 14 O 7 C 8 H 16 O 8 Monosaccharides Monosaccharides Organic Lecture Series 6 • There are only two trioses: D ihydroxyacetone (a ketotriose) Glyceraldehyde (an aldotriose) CHO CHOH CH 2 OH 2 C=O 2 H 2 CO H HC OH H 2 C OH Glycerol 1,2,3-Propanetriol Monosaccharides Monosaccharides
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Organic Lecture Series 7 • Often the designations aldo- and keto- are omitted and these compounds are referred to simply as trioses, tetroses, and so forth – although these designations do not tell the nature of the carbonyl group, they at least tell the number of carbons Dihydroxyacetone (a ketotriose) Glyceraldehyde (an aldotriose) CHO CHOH CH 2 OH CH 2 C=O CH 2 Monosaccharides Monosaccharides Organic Lecture Series 8 Glyceraldehyde Glyceraldehyde contains a stereocenter and exists as a pair of enantiomers CH O
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This note was uploaded on 11/21/2011 for the course CH 51455 taught by Professor Colapret during the Spring '11 term at University of Texas at Austin.

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310_24 - Organic Lecture Series CH 310 N LECTURE 24...

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