The title compound, C16H19ClNO3P, is one of a series of alpha-substitu
ted aminomethyl phosphonates. There are two independent molecules in t
he asymmetric unit and in each the P atom adopts a tetrahedral configu
ration. The P=O double-bond length and the mean P-O single-bond length
are 1.425 (5) and 1.560(5) Angstrom for molecule (1) and 1.417 (6) an
d 1.562 (5) Angstrom for molecule (2), respectively. The P=O double-bo
nd lengths in both molecules are shorter than those in 1,3,2-oxazaphos
pholidine derivatives and caged bicyclic phosphorus compounds.