The synthesis of two new series of functional phosphines oxides is described: analogs of glyphosate [α-aminomethylbis(hydroxymethyl)phosphine oxide] and bisphosphonic acids [bis(hydroxymethyl)phosphoryl methylphosphonic acid] substituting the phosphonic group [–P(O)(OH)2] by the bis(hydroxymethyl)phosphoryl group [–P(O)(CH2OH)2], have been synthesized in good yields, using the bis(benzyloxymethyl)chloromethyl