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Fluorinated rhodium-phosphine complexes as efficient homogeneous catalysts for the hydrogenation of styrene in supercritical carbon dioxide

By Altinel H., Avsar G. and Guzel B.

Abstract

A fluorinated trisphenylphosphine ligand was reacted with [(COD)CIRh] 2 (COD = cyclooctadiene) and [(COD)2Rh] +BArF- {BArF = tetrakis[(3,5-bistrifluoromethyl)phenyl] borate} to synthesize new fluorinated derivatives of the well-known Wilkinson catalyst as {[P(Ph(CF3)2)3]3RhBArF}, {[P(Ph)3]3RhBArF} and {[P(Ph(CF3) 2)3]3RhCl}. BArF anion was used to synthesize cationic complexes. All the synthesized complexes were tested and found to be soluble in supercritical carbon dioxide (scCO2) media. The catalytic activities of the rhodium complexes were examined for hydrogenation of styrene in scCO2. The catalysts showed different activities between 47.9-77.4%. The most effective result among the synthesized Rh-catalysts was obtained with a conversion of 77.4% corresponding to {[P(Ph(CF3) 2)3]3RhBArF} under the reaction conditions of 343K temperature and 123 bar pressure after 8 h in scCO2 (molar ratio of substrate to catalyst = 500). © 2009 Springer Science+Business Media B.V.FEF2007BAP19 100T130 National Council for Scientific ResearchAcknowledgments We would like to thank the Scientific and Technical Research Council of Turkey (TUBITAK 100T130) and C¸ ukurova University Research Foundation for financial support (FEF2007BAP19

Year: 2009
DOI identifier: 10.1007/s11243-009-9199-7
OAI identifier: oai:openaccess.cu.edu.tr:20.500.12605/15358
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