Synthesis and characterization of N-heterocyclic carbene substituted phosphine and phosphite rhodium complexes and their catalytic properties in hydrogenation reactions

Wolfgang A. Herrmann, Guido D. Frey, Eberhardt Herdtweck, Martin Steinbeck

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

37 Zitate (Scopus)

Abstract

Mixed N-heterocyclic carbene-substituted phosphine and phosphite complexes of rhodium were prepared, starting from [Rh(COE)2Cl]2 (COE = cyclooctene) by addition of free N-heterocyclic carbenes (NHC) and PR 3. All new complexes were characterized by spectroscopy. In addition, the structures of trans-chloro(1,3-dicyclohexylimidazol-2-ylidene)- bis(triphenylphosphite)rhodium(I) (5), chloro-trans-bis(1,3- dicyclohexylimidazol-2-ylidene) (triphenylphosphine)rhodium(I) (6), and chloro(η4-1,5-cyclooctadiene)(1,3-di-[(1R,2S,5R) -2-isopropyl-5-menthylcyclohex-1-yl]imidazol-2-ylidene)rhodium(I) (8) 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.

OriginalspracheEnglisch
Seiten (von - bis)1677-1691
Seitenumfang15
FachzeitschriftAdvanced Synthesis and Catalysis
Jahrgang349
Ausgabenummer10
DOIs
PublikationsstatusVeröffentlicht - Juli 2007

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