(Methylchlorosilyl)methyldichlorophosphines have been synthesized by t
he reaction of [dimethy(diethylamino)silyl]- or [methyl-bis(diethylami
no)silyl]methylmagnesium chlorides with PCl3 in ether at -40 divided-b
y -20-degrees-C and subsequent treatment of the reaction mixture with
dry HCl. The structures of the compounds thus obtained have been studi
ed by P-31, H-1, and C-13 NMR spectroscopy.