摘要
Since the study of the nuclear magnetic resonance （NMR）spectra of a number of sixmembered ring compounds reported by Lemieux et al. in 1958, the chemical shift and coupling constant for H<sub>1</sub> have been used extensively to identify anomeric isomers in carbohydrate compounds. In 1-O-acyl-tetra-O-acetyl-β-O-hexapyranose, the anomeric proton of the
