28. Carbohydrates
Disaccharide
4:06 minutes
Problem 20-45
Textbook Question
Textbook QuestionThe disaccharide lactulose consists of a d-galactopyranose subunit and a d-fructofuranose subunit joined by a b-1,4′-glycosidic linkage. After treatment of lactulose with 1. excess CH3I/Ag2O, 2. HCl/H2O, the d-galactopyranose subunit was found to have one nonmethylated OH group, whereas the d-fructofuranose subunit had two. Draw the structure of a-lactulose.
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