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

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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).

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Acknowledgments

We would like to thank the Scientific and Technical Research Council of Turkey (TUBITAK 100T130) and Çukurova University Research Foundation for financial support (FEF2007BAP19)

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Authors and Affiliations

  1. Science and Letters Faculty, Chemistry Department, Çukurova University, Adana, 01330, Turkey

    Hüseyin Altinel & Bilgehan Guzel

  2. Science and Letters Faculty, Chemistry Department, Mersin University, Mersin, 33342, Turkey

    Göktürk Avsar

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  1. Hüseyin Altinel
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  2. Göktürk Avsar
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  3. Bilgehan Guzel
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Correspondence to Hüseyin Altinel.

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Altinel, H., Avsar, G. & Guzel, B. Fluorinated rhodium-phosphine complexes as efficient homogeneous catalysts for the hydrogenation of styrene in supercritical carbon dioxide. Transition Met Chem 34, 331–335 (2009). https://doi.org/10.1007/s11243-009-9199-7

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  • DOI: https://doi.org/10.1007/s11243-009-9199-7

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