Twenty-one new phosphorus compounds were synthesized by the reaction of O,O-dialkyl-alpha-chloroacetoxyalkyl phosphonates and sodium salt of 3-hydroxymethylbenzoxazolone. Their structures were confirmed by means of elementary analysis, IR, H-1 and P-31 NMR and MS. The possible mechanism is that the unsteady reactive intermediate reacting from reactants undergoes intramolecular elec...