Chapter 25 : Carbohydrates |
The D- and L- notation is based on these structures. (Note that D- and L- means something quite different to d- and l-).
S-(-)-glyceraldehyde
or
L-glyceraldehydeR-(+)-glyceraldehyde
or
D-glyceraldehyde
Study Tip ?
L-glyceraldehyde has the -OH group on the left
and
D-glyceraldehyde on the right in the Fischer projections of the
structures.
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A series of carbohydrates are shown below, decide whether they are D- or L- by comparing them to glyceraldehyde
Haworth diagrams these are "flattened" diagrams used to represent the stereochemistry carbohydrates, note how the relative positions of the groups in the two structures are related.
L-glyceraldehyde ANSWER
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© Dr. Ian Hunt, Department of Chemistry |