Abstract
Oximation of methyl 4,6-O-benzylidene-2-deoxy-α-D-erythro-hexopyranosid-3-ulose (1) afforded one oxime with the syn-structure, whereas oximation of the threo-isomer (4) afforded products with the syn- and anti-structures, as determined from their n.m.r. spectra. A detailed study of these spectra enabled an assignment of the C-2 methylene signals in the spectra of the parent glycosiduloses. In both compounds (1) and (4) the axial methylene proton resonates downfield from the equatorial one.
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