The next generation of C2-symmetric ligands: A di-N-heterocyclic carbene (NHC) ligand and the synthesis and X-ray characterization of mono- and dinuclear rhodium(I) and iridium(I) complexes |
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| Authors: | Roxy J Lowry Muhammad T JanKhalil A Abboud Ion GhivirigaAdam S Veige |
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| Institution: | Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, FL 32611, United States |
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| Abstract: | A new C2-symmetric chelating di-N-heterocyclic carbene (NHC) ligand is reported. The stable free di-carbene (+/−)DEAM-BY] (3) forms upon treating the imidazolium salt (+/−)DEAM-BI]OTf]2 (2) with potassium bis-trimethylsilylamide (where DEAM-BY = trans-9,10-dihydro-9,10-ethanoanthracene-11,12-bis(1-benzyl)imidaz-2-ylidene and DEAM-BI = trans-9,10-dihydro-9,10-ethanoanthracene-11,12-bis(1-benzyl)imidazolium). Metalation reactions of 2 with Rh(COD)Cl]2 and Ir(COD)Cl]2 are carried out under mild conditions to produce either mono- or bimetallic complexes. Each compound is characterized by NMR spectroscopy, combustion analysis, and single-crystal X-ray crystallography. |
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| Keywords: | Carbene Catalysis Bimetallic NHC Chiral Enantioselective |
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