5085

Given the Fischer structure of L-mannose, provide a clear Haworth structure and a chair conformer three dimensional representation of b-D-mannopyranose.

L-mannose

5123

Determination of the absolute configuration of (+)-lactic acid (CH₃CHOHCO₂H) goes as follows: D-(+)-glyceraldehyde (HOCH₂CHOHCHO) was oxidized to active glyceric acid (HOCH₂CHOHCO₂H) with HgO. The glyceric acid was reduced to (-)-lactic acid. Trace the course of the reactions using the Fischer convention, and deduce the absolute configuration of the (+)-lactic acid.

5170

Galactose is epimeric with glucose at carbon #4. Draw the following:

(a) chair conformation for a-D-galactose	(b) Haworth structure for b-D-galactose	(c) Fischer projection for L-galactose

by completing the part structures provided.

5274

Draw a stereo representation of the most stable chair conformation of a-D-mannopyranose.