In acidic solution an aldonic acid is converted to a gamma, Ask an Expert

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1. In acidic solution an aldonic acid is converted to a gamma lactone. Draw the structure of the gamma lactone formed from galactose, and draw a mechanism for its formation.

2. Deduce the structure of trisaccharide X from the given information.

a. Methylation with excess CH 3 I/Ag 2 O followed by hydrolysis with acid gives three products: 2,3,4,6-tetra- O -methyl-D-galactopyranose, 1,3,6-tri- O -methyl-D-fructofuranose and 2,3,4-tri- O -methyl-D-glucopyranose. Each compound is formed as a mixture of anomers.

b. Trisaccharide X is hydrolyzed by an enzyme that is specific for the B2 -glycosidic linkage to give D-galactose and a disaccharide.

c. Trisaccharide X is hydrolyzed by an enzyme that is specific for the B1 -glycosidic linkage to give D-fructose and a disaccharide.

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