5086

The a and b methyl D-mannopyranosides each produce a different dialdehyde stereoisomer on periodate degradation. Use Fischer projection formulas to illustrate the stereochemistry in each case.

5171

Write a detailed mechanism and give a brief explanation to explain why treatment of either anomer of glucose with CH₃OH/HCl results in methylation at only the anomeric carbon. Also explain why a mixture of anomeric methyl glycosides is formed regardless of which anomer is used.