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Volumn , Issue 13 SPEC. ISS., 2009, Pages 1729-1738

Synthesis and study of 5,5'-bibenzimidazolylidenes and their bimetallic complexes

Author keywords

Benzimidazolium salts; Bimetallics; Carbenes; Nitrogen heterocycles; Polychlorinated biphenyls; Rhodium

Indexed keywords

DIHEDRAL ANGLE; NITROGEN; ORGANIC POLLUTANTS; RHODIUM COMPOUNDS; SYNTHESIS (CHEMICAL);

EID: 66249112843     PISSN: 14341948     EISSN: 10990682     Source Type: Journal    
DOI: 10.1002/ejic.200801188     Document Type: Article
Times cited : (54)

References (77)
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    • For excellent reviews, see: a) W. A. Herrmann, K. Köcher, An-gew. Chem. Int. Ed. Engl. 1997, 36, 2163-2187;
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    • For selected examples of bimetallic complexes formed betweentransition metals and (non-rigid) bis (NHC)s connectedthrough saturated linkers, see: a) W. A. Herrmann, M. Elison,J. Fischer, C. Köcher, G. R. J. Artus, Chem. Eur. J. 1996, 2, 772-780;
    • For selected examples of bimetallic complexes formed betweentransition metals and (non-rigid) bis (NHC)s connectedthrough saturated linkers, see: a) W. A. Herrmann, M. Elison,J. Fischer, C. Köcher, G. R. J. Artus, Chem. Eur. J. 1996, 2, 772-780;
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    • For examples of other classes of linearly opposed bis-(NHC)s ligated to transition metals, see: a) O. Guerret, S. Solé, H. Gornitzka, M. Teichert, G. Trinquier, G. Bertrand, J. Am. Chem. Soc, 1997, 119, 6668-6669;
    • For examples of other classes of linearly opposed bis-(NHC)s ligated to transition metals, see: a) O. Guerret, S. Solé, H. Gornitzka, M. Teichert, G. Trinquier, G. Bertrand, J. Am. Chem. Soc.. 1997, 119, 6668-6669;
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    • W. Li, Ph. D. Thesis, Uni-versity of Alabama, uscaloosa (USA), 2004;
    • b) W. Li, Ph. D. Thesis, Uni-versity of Alabama, uscaloosa (USA), 2004;
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    • Albrecht and co-workers recently reported weak to moderatecoupling in bimetallic Fe and Ru derivatives of 1, see: L.Mercs,A. Neels, M. Albrecht, Dalton Trans. 2008, 5570-5576
    • Albrecht and co-workers recently reported weak to moderatecoupling in bimetallic Fe and Ru derivatives of 1, see: L.Mercs,A. Neels, M. Albrecht, Dalton Trans. 2008, 5570-5576.
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    • This material displayed signals characteristic of tetraaminoe-thylenes at, 100-110 ppm in its 13C NMR spectrum, D8, THF and at, 1600 cm-1(br) in its IR spectrum (KBr, see:a) ref, 14, Z. Shi, R. P. Thummel, J. Org. Chem. 1995, 60,5935-5945;
    • This material displayed signals characteristic of tetraaminoe-thylenes at ? = 100-110 ppm in its 13C NMR spectrum ([D8] -THF) and at ? = 1600 cm-1(br) in its IR spectrum (KBr); see:a) ref. [14]; Z. Shi, R. P. Thummel, J. Org. Chem. 1995, 60,5935-5945;
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    • Further characterization of thismaterial is underway
    • c) J. W. Kamplain, V. M. Lynch, C. W. Bielawski, Org. Lett. 2007, 9, 5401-5404. Further characterization of thismaterial is underway.
    • (2007) Org. Lett , vol.9 , pp. 5401-5404
    • Kamplain, J.W.1    Lynch, V.M.2    Bielawski, C.W.3
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    • For examples of the evaluation of electronic coupling in othertypes of bimetallic Rh complexes, see: a W. Kaim, R. Rein-hardt, J. Fiedler, Angew. Chem. Int. Ed. Engl. 1997, 36, 2493-2495;
    • For examples of the evaluation of electronic coupling in othertypes of bimetallic Rh complexes, see: a) W. Kaim, R. Rein-hardt, J. Fiedler, Angew. Chem. Int. Ed. Engl. 1997, 36, 2493-2495;
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    • Unfortunately, complexes 6a-c failed to undergo carbon-ylation, even under forcing conditions (e.g., high CO pressureand elevated temperatures). These results are consistent withthe reversibility of their oxidations: steric shielding around themetal may prevent both ligand coordination and associativedisproportionation.
    • Unfortunately, complexes 6a-c failed to undergo carbon-ylation, even under forcing conditions (e.g., high CO pressureand elevated temperatures). These results are consistent withthe reversibility of their oxidations: steric shielding around themetal may prevent both ligand coordination and associativedisproportionation.


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