Abstract
A comparison of the galactose and galactitol spectra with those of methylated derivatives provides the signal assignment of this hexose and its polyol. A formerly stated rule can be confirmed: Methylation of hexopyranose hydroxyls causes upfield shifts of about 4·5 ppm on β-carbons with axial OH groups. In the series of polyols O-methylation causes down-field shifts on the resonance of C α of about 9–10 ppm, downfield shifts on that of C β for about 0·6 to 0·9 ppm and upfield shifts of about 0·3 to 0·5 ppm on the C γ-resonance.
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