Carbohydrates
Explore the world of carbohydrates with a focus on aldohexoses, aldopentoses, aldotetroses, and manipulation of Fischer projections. Learn about their structures, isomers, and conventions for proper representation in organic chemistry.
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Presentation Transcript
CARBOHYDRATES By Dr.S.V. Lamture
The Aldotetroses. Glyceraldehyde is the simplest carbohydrate (C3, aldotriose, 2,3-dihydroxypropanal). The next carbohydrate are aldotetroses (C4, 2,3,4-trihydroxybutanal). 2
23.4: Aldopentoses and Aldohexoses. Aldopentoses: C5, three chiral carbons, eight stereoisomers Aldohexoses: C6, four chiral carbons, sixteen stereoisomers 3
Manipulation of Fischer Projections 1. Fischer projections can be rotate by 180 (in the plane of the page) only! 180 180 Valid Fischer projection Valid Fischer projection 4
a 90 rotation inverts the stereochemistry and is illegal! This is not the correct convention for Fischer projections 90 Should be projecting toward you Should be projecting away you This is the correct convention for Fischer projections and is the enantiomer 5
2. If one group of a Fischer projection is held steady, the other three groups can be rotated clockwise or counterclockwise. 120 120 hold steady hold steady hold steady 120 120 6 hold steady hold steady hold steady
Thanks for your Attention
