Pyridine-catalysed cis–trans-isomerisation of a µ,η2-vinyl ligand in a triosmium cluster
Abstract
Stereospecific cis-addition of [Os3D2(CO)10] to C2H2 and of [Os3H2(CO)10] to C2D2 gives partially deuteriated samples of [Os3H(µ,η2-CHCH2)(CO)10] which undergo pyridine-catalysed cis–trans-isomerisation about the carbon-carbon double bond via the intermediate zwitterionic alkylidene complex [Os3H(µ,η1-CHCH2NC5H5)(CO)10].