Abstract
Mass spectrometry has revealed that a vicinal cis-amino-alcohol grouping in methyl amino-4-6- O-benzylidene-deoxy-α- D-aldopyranosides forms, on treatment with benzeneboronic anhydride, a 2-phenyl-1,3,2-oxazaborolidine ring, whereas the corresponding trans-grouping forms a 2,4-diphenyl-1,3,5-dioxaza-2,4-diborepine ring. The conformations of the pyranoid ring in the derivatives thus formed are discussed.
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