Conformations of two D-glucoseptanosides: an X-ray crystallographic study of ethyl 2,3:4,5-Di-O-isopropylidene-1-thio-β-D-glucoseptanoside and methyl 2,3,4,5-tetra-O-acetyl-β-D-glucoseptanoside

Abstract

In ethyl 2,3:4,5-di-O-isopropylidene-1-thio-β-D-glucoseptanoside (I), the seven-membered ring has been shown to have a twist–chair conformation and the two dioxolan rings have twist conformations; in methyl 2,3,4,5-tetra-O-acetyl-β-D-glucoseptanoside (II), the seven-membered ring has a conformation between a chair and twist–chair.