Chemical shift changes in the 1H nuclear magnetic resonance spectrum of β-D-arabinose induced by boron(III) oxide

Abstract

The ¹H n.m.r. spectrum of β-D-arabinose was measured at 89.6 MHz in the presence of boron(III) oxide. The boron(III) oxide produces remarkable chemical shift changes in hydroxy proton signals and the signals of all methine and methylene groups in the β-D-arabinose dissolved in (CD₃)₂SO. The assignments of the spectrum of β-D-arabinose with 2 mol. equiv. of boron(III) oxide were determined by spin-decoupling experiments.