Stereochemical Aspects of Proton Chemical Shifts. IX. Influence of O‐Alkyl Groups on the Chemical Shift of the Glycosidic Proton in Pyranoid Systems

The 1H NMR parameters of some alkyl β‐D‐xylopyranosides (alkyl = Me, Et, n.Pr, i.Pr and t.Bu) have been measured in D2O and DMSO‐d6 solution at 300 and 360 MHz. A rationale is checked to explain the influence of the 0‐alkyl groups on the chemical shift of the glycosidic proton. It is found, as reported previously for other cases1, 2, that γ‐increments in full carbon‐skeleton are very similar to those in a H‐C‐O‐C‐C skeleton.