lecture 25.1

lecture 25.1 - 25-25-1Organic Organic H BrownWilliam H...

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Unformatted text preview: 25-25-1Organic Organic ChemistryChemistryWilliam H. BrownWilliam H. BrownChristopher S. FooteChristopher S. FooteBrent L. IversonBrent L. Iverson25-25-2CarbohydratesCarbohydratesChapter 25Chapter 2525-25-3CarbohydratesCarbohydrates◆Carbohydrate:Carbohydrate:a polyhydroxyaldehyde, a polyhydroxyketone, or a compound that gives either of these compounds after hydrolysis◆Monosaccharide:Monosaccharide:a carbohydrate that cannot be hydrolyzed to a simpler carbohydrate•they have the general formula C HO , where n varies from 3 to 8•aldose:aldose:a monosaccharide containing an aldehyde 25-25-4MonosaccharidesMonosaccharides◆Monosaccharides are classified by their number of carbon atomsHexoseHeptoseOctoseTrioseTetrosePentoseFormulaNameC3H6O3C4H8O4C5H10O5C6H12O6C7H14O7C8H16O825-25-5MonosaccharidesMonosaccharides◆There are only two trioses◆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 carbonsD ihydroxyacetone(a ketotriose)Glyceraldehyde(an aldotriose)CHOCHOHCH2OHCH2OHC=OCH2OH25-25-6MonosaccharidesMonosaccharides◆Glyceraldehyde contains a stereocenter and exists as a pair of enantiomersCHOCHOHCH2OHCHOCCH2OHHHO(S)-Glyceraldehyde(R)-Glyceraldehyde25-25-7Fischer ProjectionsFischer Projections...
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lecture 25.1 - 25-25-1Organic Organic H BrownWilliam H...

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