Abstract
d-Xylose, d-arabinose, and d-ribose were each treated with 2,2-dimethoxypropane in N, N-dimethylformamide containing a trace of p-toluenesulfonic acid. d-Xylose gave 3,5- O-isopropylidene- d-xylofuranose, 1,2:3,5-di- O-isopropylidene-α- d-xylofuranose, 1,2- O-isopropylidene-α- d-xylopyranose, and two acyclic di- O-isopropylidene derivatives. d-Arabinose gave the known 3,4- O-isopropylidene-β- d-arabinopyranose and 1,2:3,4-di- O-isopropylidene-β- d-arabinopyranose. d-Ribose gave 2,3- O-isopropylidene- d-ribofuranose almost exclusively.
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