The 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/Ag20, 2. HCI/H20, 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.
The 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/Ag20, 2. HCI/H20, 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.
Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter20: Carbohydrates
Section: Chapter Questions
Problem 20.75P
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