Abstract
The labile iridium(I) precursor trans-[IrCl(C 8H 14)(P iPr 3) 2] ( 2), prepared in situ from [IrCl(C 8H 14) 2] 2 ( 1) and P iPr 3, reacted with equimolar amounts of 1,4-C 6H 4(C CSiMe 3) 2 ( 3) at 60 °C to give the mononuclear vinylidene complex trans-[IrCl( C C(SiMe 3)C 6H 4C CSiMe 3)(PiPr 3) 2] ( 4). From 2 and 3 in the molar ratio of 2:1, the dinuclear compound trans,trans-[(P iPr 3) 2ClIr( C C(SiMe 3)C 6H 4C(SiMe 3) C )IrCl(P iPr 3) 2] ( 5) was obtained. Reaction of 4 with [RhCl(P iPr 3) 2] 2 ( 6) at room temperature afforded the heterodinuclear alkyne(vinylidene) complex trans,trans-[(P iPr 3) 2ClIr( C C(SiMe 3)C 6H 4C CSiMe 3)RhCl(P iPr 3) 2] ( 7), which on heating at 45 °C was converted to the bis(vinylidene) isomer trans,trans-[(P iPr 3) 2ClIr( C C(SiMe 3)C 6H 4C(SiMe 3) C )RhCl(P iPr 3) 2] ( 8).
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