Homogeneous catalysis of olefin isomerisation. Part I. Reactions of trans-[2H2]ethylene catalysed by complexes of cobalt, ruthenium, rhodium, and palladium
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 12,p. 1204-1207
- https://doi.org/10.1039/dt9720001204
Abstract
Reactions of trans-[2H2]ethylene with solutions of CoHN2(PPh3)3, RuHCl(PPh3)3, RuCl2(PPh3)3, and of RhH(CO)-(PPh3)3 in benzene at 50° have been investigated. Redistribution of hydrogen isotopes in the ethylene occurred, leading eventually to a random distribution, the reaction proceeding via ethyl intermediates. Solutions of the hydrido-complexes were of comparable activity, and were more active than those of RuCl2(PPh3)3. Hydrogen exchange was observed between deuterium atoms of the olefin and protium atoms in the ortho-positions of the triphenylphosphine ligands of RuHCl(PPh3)3. A solution of PdCl2(PhCN)2 in benzene at 50° catalysed the conversion of trans-into cis-[2H2]ethylene without simultaneous isotope redistribution. Routes by which this can occur are discussed.Keywords
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