SYNTHESIS AND PROPERTIES OF (TRIFLUOROMETHYL)TRICHLOROSILANE, A VERSATILE PRECURSORFOR CF3Si COMPOUNDS

Article abstract of DOI:10.1016/0022-328X(86)82073-3

(Trifluoromethyl)trichlorosilane (I) has been prepared for the first time by the reaction of CF3SiH(NMe2)2 (III) with HCl in dibutyl ether and, as a solution in CH2Cl2, by nucleophilic trifluoromethylation of SiCl4 with CF3Br/P(NEt2)3.From this solution, I mey be isolated by HCl cleavage of its insoluble bis(pyridine) adduct (II).The aminosilane III was obtained from the reaction of HSi(Cl)(NMe2)2 with CF3Br/P(NEt2)3.Selective substitution of I without attack on the CF3Si moiety was achieved in high yields with SbF3 (-> CF3SiF3), Ag(OCN) (-> CF3Si(NCO)3 (IV)), MeOH (-> CF3Si(OMe)3 (V)), HNMe2 (CF3Si(NMe2)3 (VI)), LiAlH4 (-> CF3SiH3), MeMgBr (-> CF3SiMe3) and LiPh (-> CF3SiPh3 (VII)).With 2,2'-bipyridyl a 1/1complex (VIII) was formed.The novel compounds I to VIII have been characterized by their IR, NMR and mass spectra, and for I a vibrational analysis including a normal coordinate treatment has been performed.