Abstract
A variety of substituted hydroxymethylene diphosphonic acids derivatives comprises good complexones and the substances widely used in medicine [1]. Compounds containing hydrolytically stable hydroxymethylene diphosphonic fragment PCP are of interest as an unusual organophosphorus analogs of natural pyrophosphates [2]. We found that the reaction of trimethylsilyl esters of trivalent phosphorus with the readily accessible chlorides of unsaturated carboxylic acids affords new hydroxymethylene diphosphonic compounds containing unsaturated fragments. They may be of interest as promising complexones and antioxidants.
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