Abstract The aminomethylation of the derivatives of trivalent organophosphorus acids, containing PH and POSiMe 3 fragments with various bis-and tris (alkoxymethyl) amines and bis (alkoxymethyl) amino acids, is proposed as a convenient method for the synthesis of new bis-and trisphosphorylated amines and amino acids as well as their derivatives with four and five coordinated phosphorus. Also the three-components systems of phosphorous acid, ...