Herrmann, Wolfgang A.;
Frey, Guido D.;
Herdtweck, Eberhardt;
Steinbeck, Martin
Synthesis and Characterization of N‐Heterocyclic Carbene Substituted Phosphine and Phosphite Rhodium Complexes and their Catalytic Properties in Hydrogenation Reactions
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Medientyp:
E-Artikel
Titel:
Synthesis and Characterization of N‐Heterocyclic Carbene Substituted Phosphine and Phosphite Rhodium Complexes and their Catalytic Properties in Hydrogenation Reactions
Beteiligte:
Herrmann, Wolfgang A.;
Frey, Guido D.;
Herdtweck, Eberhardt;
Steinbeck, Martin
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Mixed N‐heterocyclic carbene‐substituted phosphine and phosphite complexes of rhodium were prepared, starting from [Rh(COE)<jats:sub>2</jats:sub>Cl]<jats:sub>2</jats:sub> (COE=cyclooctene) by addition of free N‐heterocyclic carbenes (NHC) and PR<jats:sub>3</jats:sub>. All new complexes were characterized by spectroscopy. In addition, the structures of <jats:italic>trans</jats:italic>‐chloro(1,3‐dicyclohexylimidazol‐2‐ylidene)<jats:italic>‐</jats:italic>bis(triphenylphosphite)rhodium(I) (<jats:bold>5</jats:bold>), chloro‐<jats:italic>trans</jats:italic>‐bis(1,3‐dicyclohexylimidazol‐2‐ylidene) (triphenylphosphine)rhodium(I) (<jats:bold>6</jats:bold>), and chloro(η<jats:sup>4</jats:sup>‐1,5‐cyclooctadiene)(1,3‐di‐[(1<jats:italic>R</jats:italic>,2<jats:italic>S</jats:italic>,5<jats:italic>R</jats:italic>)‐2‐isopropyl‐5‐menthylcyclohex‐1‐yl]imidazol‐2‐ylidene)rhodium(I) (<jats:bold>8</jats:bold>) were determined by single crystal X‐ray analyses. The hydrogenation of cyclohexene using molecular hydrogen has been optimized for some N‐heterocyclic carbene‐substituted phosphine and phosphite rhodium complexes by variation of the reaction conditions.</jats:p>