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Phosphinoalkylsilanes: synthesis and spectroscopic properties of phosphino(silyl)methanes, 1-phosphino-2-silylethanes, and 1-phosphino-3-silylpropanes

Synthesis of thirty-three compounds Ph2P(CH2)nSiXYZ (n= 1, 2, or 3) and Me2P(CH2)2SiXYZ in which X, Y, or Z = H, Me, Ph, or Cl has been accomplished by (a) reaction at –78 °C in tetrahydrofuran between alkyl(chloro)silanes and Ph2PCH2Li·tmeda for n= 1, or (b u.v. irradiation of chloro(vinyl)silanes or allyl(chloro)silanes with Ph2PH or Me2PH for n= 2 or 3, with (c) reduction of the chlorosilyl products to Si–H analogues. Characterization of the phosphinoalkylsilane derivatives includes full 1H, 13C, and 31P n.m.r. data which are discussed in terms of dependence on the number of methylene groups, n, in the backbone and on the substituents, X, Y, Z, at Si, together with comparisons to related compounds.