Chapter 7: Carbohydrates Flashcards Preview

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Flashcards in Chapter 7: Carbohydrates Deck (7):
1

how do you find the number of possible isomers?

2^n
- n= number of chiral carbons
L> two H = not chiral

2

Enantiomers?

- mirror images

3

diastereomers?

- not mirror images

4

D vs L sugar?

- looking at chiral carbon furthest from the carbonyl group!
- D= right OH
- L= left OH

5

epimers?

- diastereomers that differ via one chiral atom

6

Mutarotation?

- when alpha and beta monosaccharides dissolve in water they interconvert forming an equilibrium mixture of open chain alpha and beta pyranose and furanose forms.
- beta= OH above carbon 1 , alpha= below

7

Steps to drawing a Haworth structure from fischer projection?

1. draw the five or six membered ring
2. number the carbons in both structures
3. draw atoms attached to the anomeric carbon (first carbon n aldoses, second in ketoses)...alpha= down, beta is up
4. the last carbon is always up in D-sugars
5. imagine the fischer projection falling over to the right...the Oh groups that were on the left are now up in the haworth structure...
L> remember that the carbon furthest via cDoubleBondO reacts to form the oxygen within the ring and been an OH and the anomeric OH had been the carbonyl oxygen.