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Abstract
Azetidine-3-phosphonic acid, 4a, and azetidine-3-phosphonous acid. 4b, have been prepared by the interaction of I-benzhydryl-3-methanesulfonato-azetidine with sodium phosphite or sodium O-ethyl-diethoxymethylphosphonite, followed by catalytic debenzhydrylation with HZ and hydrolysis. Neither acid shows biological activity.