Half-sandwich η-cycloheptatri-ene and -enyl derivatives of titanium and zirconium

Abstract

Treatment of [Zr(η⁶-C₇H₈)₂]1 in tetrahydrofuran with iodine gives [Zr(η-C₇H₇)(thf)₂I]2 which reacts with PMe₃ forming [Zr(η-C₇H₇)(PMe₃)₂I]3. The latter reacts with iodotrimethylsilane to give the exo-trimethylsilylcycloheptatriene compound [Zr{exo-η⁶-C₇H₇(SiMe₃)}(PMe₃)₂I₂]4. Thermolysis of 4 gives [Zr(η⁶-C₇H₈)(PMe₃)₂I₂]5. The compounds [M(η-C₇H₇)L₂Cl][M = Ti, L₂=(PMe₃)₂6, Me₂NCH₂CH₂NMe₂7 or Me₂PCH₂CH₂PMe₂8; M = Zr, L₂= Me₂NCH₂CH₂NMe₂9] have been prepared in one-pot reactions.