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An improved method is developed by using strongly acidic cation exchange resin(001×1, H+ form) as a catalyst for the synthesis of diphenyl 1 - (N - benzyloxycarbonyl - amino) alka-nephosphonates and 1 - (N - benzyloxycarbonylamino) alkanephenyl phosphinic acids in high yields.
An improved method is developed by using an acidic cation exchange resin (001 × 1, H + form) as a catalyst for the synthesis of diphenyl 1 - (N - benzyloxycarbonyl - amino) alka - nephosphonates and 1 - acids in high yields.