Abstract
The preparation of mono- O-isopropylidene derivatives and mono- O-isopropylidene benzeneboronates of monosaccharides in one step is described, together with their p.m.r. and mass-spectral characteristics. In particular, the use of boric acid in the synthesis of the new acetal 1,2- O-isopropylidene-β- L-arabinopyranose ( 8) is described, together with improved procedures for the preparation of 2,3- O-isopropylidene- D-mannofuranose ( 5) and 3,4- O-isopropylidene- L-arabinopyranose ( 10). The use of boric acid in the partial hydrolysis of 1,2:3,4-di- O-isopropylidene-β- L-arabinopyranose to give the 1,2-acetal is reported.
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