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

Abstract

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.