1981 年 101 巻 5 号 p. 410-414
The 13C-NMR spectra of 6-and 6'-O-tritylcellobiose peracetates and methyl 6-and 6'-O-tritylcellobioside peracetates in chloroform-d were determined. 13C signals were assigned by chemical shift comparisons with α- and β-D-glucopyranose pentaacetates, methyl β-D-glucopyranoside tetraacetate, methyl 6-O-trityl-β-D-glucopyranoside triacetate, methyl 4-O-methyl-β-D-glucopyranoside triacetate, methyl 4-O-methyl-6-O-trityl-β-D-glucopyranoside diacetate, and α-and β-cellobiose octaacetates. It was found that 13C-NMR spectroscopy is a useful tool for determining which position of 6-or 6'-primary alcohol group is substituted with a trityl group. The effects of 6-and 6'-O-trityl substitutions upon the conformation around the interglycosidic linkage of the cellobiose are discussed by using the trityl substitution shifts in 13C-NMR and by comparing the conformation of 6-O-trityl-α-cellobiose heptaacetate in the crystalline state obtained by an X-ray analysis.