¹H‐NMR Study of the Di‐Glucopyranoses in D₂O

Abstract

Abstract We report the analysis at 300 MHz of the 1 H‐n.m.r. spectra of all the α‐D‐, and β‐D‐glucopyranosyl‐ (1 → x) ‐D‐glucopyranoses (x = 1, 2, 3, 4 and 6) in D 2 O (CHART 1, 1‐9). Chemical shifts were compared with those of α‐D‐, and β‐D‐glucopyranose. Using homo‐INDOR experiments and applying increment rules it was possible to identify all the resonances of the individual protons and to assess the position of the glycosidic linkage. All protons situated on, or vicinal to carbons involved in this linkage, are shifted downfield. Exceptions occur for the glycosidic proton belonging to the non‐reducing parts.