Identification of O -Methyl Substituted Glycopyranoses and Their Methyl glycosides by hmbc, 1 H and 13 C NMR Chemical Shift Increments and the 3 J( 13 C, 1 H) Coupling Constant About the Ch 3 O-Ch Bond.

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Abstract
The substitution site of partially O-methylated glycopyranoses is identified by HBMC. Their 1H and 13 C NMR chemical shifts are evaluated by considering chemical shift increments. The 3J(13 C, 1H) coupling constants are evaluated. Interesting applications of chemical shift increments are illustrated.