Abstract: | A new method for the preparation of dialkylaminomethyl-phosphonous and-phosphinic acids, R2NCH2P(O)H(OH) and (R2NCH2)2P(O)OH, is described. This involves reaction of hypophosphorous acid with hydroxymethyl-dialkyl-amines or a mixture of formaldehyde and a secondary amine. and The crystalline acids form monohydrates which are stable up to the melting points of the acids. The IR. and 31P-NMR. spectra are reported. |