Organic Chemistry

Diastereomers with stereocenters

Figure 108

D-glucose Figure 109L-glucose Figure 110D-galactose Figure 111D-mannose

D-glucose and L-glucose are enantiomers. Other pairs of sugars (e.g. L-glucose and

D-mannose)are diastereomers.

Glucose adopts a ring structure in solution. This is awkward to show with a Fischer pro-
jection so a Haworth projection is usually used instead:

Figure 112