Synthesis of New Phosphines and P-Heterocycles from Phosphonates Containing Allyl Group

Addition of phenylphosphine to allylphosphonate followed by reduction of the resulting diphosphonate gives a new branched phosphine, bis(3-phosphinopropyl)phenylphosphine. Its reaction with paraform and p-toluidine yields oligomeric 3-[3-(propylenophenylphosphino)propyl]-1,5-di-p-tolyl-1,5,3,7-diazadiphosphacyclooctane. Diethyl (5-allyl-2-ethoxybenzyl)phosphonate was obtained. Its reduction gives unsaturated (5-allyl-2-ethoxybenzyl)phosphine. This product adds two moles of formaldehyde to give bis(hydroxymethyl)(5-allyl-2-ethoxybenzyl)phosphine. The reaction of this compound with p-toluidine yielded, depending on the conditions, the corresponding bis(aminomethyl)phosphine, 1,3,5-diazaphosphorinane, and 1,5,3,7-diazadiphosphacyclooctane, and also their derivatives containing allyl substituents.