Abstract
The complexes Et 4N[Rh(SnCl 3) 2(diolefin)(PR 3)] (diolefin = COD or NBD) have been isolated and their reactions studied. Reaction with arylic tertiary phosphines led to SnCl 3 − displacement and isolation of neutral pentacoordinated Rh(SnCl 3)(diolefin)(PR 3) 2 complexes. Reaction with carbon monoxide involved diolefin displacement when the diolefin was COD, thus giving Et 4N[Rh(SnCl 3) 2(CO) 2(PR 3)] compounds, but SnCl 3 − displacement when it was NBD, thus yielding Rh(SnCl 3)(CO)(NBD)(PR 3) complexes. The complexes [Rh(diolefin)Cl] 2 were found to react with triarylphosphines in the presence of SnCl 2 and with CO bubbling through the solution to give Rh(SnCl 3)(CO)(NBD)(PR 3) when the diolefin was NBD but Rh(Cl)(CO)(PR 3) 2 when the diolefin was COD.
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