MOLECULAR AND CRYSTAL-STRUCTURE AND ELECTRON-DENSITY DISTRIBUTION IN RIMETHYLSILYL)AMINO-C,C-DICHLOROMETHYLENEPHOSPHINE

Molecular and crystal structure of rimethylsilyl)amino-C,C-dichloromet hylenephosphine which is a liquid at ambient temperature (m.p. approxi mately -9-degrees-C) was determined at - 120-degrees-C by the low-temp erature X-ray diffraction method and deformation electron density maps were calculated. Experimental evidence is obtained for the conclusion that in P-aminosubstituted phosphaalkenes the n(N)-pi(P=C) conjugatio n causes not only shortening of the single P-N bond through which this conjugation is transferred but also shortening of the P=C double bond . Comparison of peculiarities of electron density distribution is give n for both highly conjugated and double-bond localized phosphaalkenes.