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Hydrogenation & Isomerization of Alkenes

  1. Fred H. Jardine

Published Online: 15 MAR 2006

DOI: 10.1002/0470862106.ia092

Encyclopedia of Inorganic Chemistry

Encyclopedia of Inorganic Chemistry

How to Cite

Jardine, F. H. 2006. Hydrogenation & Isomerization of Alkenes. Encyclopedia of Inorganic Chemistry. .

Author Information

  1. Washington State University, Pullman, WA, USA

Publication History

  1. Published Online: 15 MAR 2006


Alkenes are isomerized by complexes of late, second or third series transition metals. This occurs either by successive β-hydride abstraction reactions or, more rarely, by a π–allylic mechanism. Both decyclization and annulation reactions of strained, cyclic hydrocarbons are catalyzed by these complexes. Palladium complexes are active catalysts for the Cope- and Claisen rearrangements. Homogeneous, catalytic hydrogenation can occur via three possible routes. Ruthenium complexes catalyze transfer hydrogenation. Catalyst modifications can be made to minimize by-product formation during hydrogenation or deuteriation.


  • cyclization and annulation;
  • hydrido complexes;
  • iridium complex catalysts;
  • mechanisms;
  • rhodium complex catalysts;
  • ruthenium complex catalysts;
  • sigmatropic rearrangements;
  • tertiary phosphine complexes