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Dehydrocupling of phenylsilaneMixed bent sandwich titanium(IV) complexes containing the donor-substituted [2-(diisopropylamino)ethyl]cyclopentadienyl (C5H4CH2CH2NiPr2 = CpN) ligand are described. The highly moisture-sensitive metallocene dichloride ( C5H4CH2CH2NNiFV2)(C5H4SiMe3)TiC12 (1) was synthesized by reaction of CpNLi with CpSTiCl3 (Cps = C5hSiMe3). Complex 1 reacts with one equivalent of HCl with protonation of the amino group to give the air-and water-stable metallocene dichloride-hydrochloride [ (C5H4CHzCHz-N(H)iPr2)(C5H4SiMe3)TiC1,]+C1-(2). The structure of 2 was determined by a single-crystal X-ray diffraction study. Com-pounds 1 and 2 are precursors for ethylene polymerization catalysts. The reaction of 2 with one equivalent of Na+B[3,5-(CF3)2C&]: afforded the borate [ (C5H4CH2CH2N(H)Pr2)-(C5H4SiMe3)TiC12]+B[ 33-( CF3)2C6H3]: (3). The dimethyl compound (C5H4CH2CH2NiPr2)(C5H&iMe3)TiMe2 (4) was obtained by reaction of 1 with two epuivalents of methyllithium. The diphenoxy complex (C5H4CH2CH2-NiPr2)(C5H4SiMe3)Ti(OPh)2 (5) was prepared analogously with a stoichiometric amount of lithium phenoxide. Compounds 4 and 5 show remarkable activity in the catalytic dehydrocoupling of phenylsilane.

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Dehydrocupling of phenylsilane

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