Question

Drawthe products of each reaction.

(a.)

(b.)

Short answer

Answer

(a.)

Reaction a.

(b.)Reaction b.

Step-by-step solution

Reactions of carbohydrates

Both alpha and beta forms of the D-glucose react with amines under mildly acidic conditions at the anomeric carbon and form the mixture of alpha and beta N-glycosides.

Reaction a.

The reactant monosaccharide is $\mathrm{\alpha }-\mathrm{D}$-glucopyranose. On reaction with amines under mildly acidic conditions, anomeric carbon reacts with it and forms the mixture of methyl substituted $\mathrm{\alpha }-\mathrm{N}-$glucoside and $\mathrm{\beta }-\mathrm{N}-$glycoside.

Product formation in reaction a.

Reaction b.

The reactant monosaccharide is $\mathrm{\beta }-\mathrm{D}-$glucopyranose. On reaction with amines under mildly acidic conditions, anomeric carbon reacts with it and forms the mixture of methyl-substituted $\mathrm{\alpha }-\mathrm{N}$-glycoside and $\mathrm{\beta }-\mathrm{N}$-glycoside.

Product formation in reaction b.