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[en] Diphosphoniomethanes, containing P-H, P-OH or P-SH groups are formed during an action of acid excess on phosphino-, phosphoryl and thiophosphorylmethylenetriphenylphosphoranes with electron acceptor substituents near α-atom of carbon. Enol forms are formed when an acyl substituent is near the carbon atom. The preparation of [(dibutylmethylphosphoranytidene) carbethoxymethyl] triphenylphosphonium tetraphenylborate is described
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