(η2-Alken)organyIruthenium(II)-KompIexe und Ethyleninsertion in Phenyl-Ruthenium-Bindungen/ (η2-A lkene)organylruthenium (II) Complexes and Ethylene Insertion into Phenyl-Ruthenium Bonds

Abstract

Abstract The reaction of the alkyl-bis(triphenylphosphine)ruthenium complexes 1-3 with ethylene (50 -150 bar) at 70 -100 °C proceeds by initial phosphine dissociation to give the η2-ethylenealkylruthenium compounds 6 -8 . The phenyl-ruthenium complex 4 reacts, under these conditions, by ethylene insertion into the Ph-Ru bond. Subsequent Ru-βH-elimination gives the diastereomeric η2 -styrene-hydrido-ruthenium compounds 10a and b. At low ethylene pressure (5 - 8 bar), 1 - 3 react mainly by orthometallation of a phosphinehenyl group followed by rapid ethylene insertion into the resulting Ph-Ru bond and Ru-βH-elimination to give the diastereomeric complexes 9a and b.