Impact of Ligand Modification on Structures and Catalytic Activities of Chelating Bis-Carbene Rhodium(I) Complexes

A series of novel chelaling N-heterocyclic bis-carbene rhodium(I) complexes based on 1,2,4-triazoles, benzimidazoles, and imidazoles with varying bridge length and N substituents has been synthesized. In addition to their structural characterization, their catalytic activity in the hydrosilylation of 4-fluoroacetophenone with diphenylsilane has been examined. The results reveal that selectivities and turnover frequencies (TOFs) are influenced by bridge length, steric demand of the N substituents, and electronic properties of the heterocycle.     «

A series of novel chelaling N-heterocyclic bis-carbene rhodium(I) complexes based on 1,2,4-triazoles, benzimidazoles, and imidazoles with varying bridge length and N substituents has been synthesized. In addition to their structural characterization, their catalytic activity in the hydrosilylation of 4-fluoroacetophenone with diphenylsilane has been examined. The results reveal that selectivities and turnover frequencies (TOFs) are influenced by bridge length, steric demand of the N substituents...     »

ISI Document Delivery No.: 672GX Times Cited: 15 Cited Reference Count: 62 Riederer, Stephanie K. U. Gigler, Peter Hoegerl, Manuel P. Herdtweck, Eberhardt Bechlars, Bettina Herrmann, Wolfgang A. Kuehn, Fritz E. Kuhn, Fritz/A-3113-2010; Herrmann, Wolfgang/A-3588-2010 Margarete Ammon Stiftung; Wacker AG Dr. Karl Ofele, Prof. Dr. Peter Harter, and Dr. Evangeline Tosh arc gratefully acknowledged for helpful discussions. This work was generously supported by the Margarete Ammon Stiftung (Ph.D. grant for S.K.U.R.) and the Wacker AG (Ph.D. grant for P.G. and S.K.U.R., PG., and M.P.H. performed the majority of the experiments and data analysis. E.H. and B.B. collected and analyzed the X-ray data. F.E.K. and W.A.H, designed and supervised the research. The paper was written by S.K.U.R., PG., B.B., and F.E.K., and all authors discussed the results and commented on the paper. 15 Amer chemical soc Washington     «

ISI Document Delivery No.: 672GX Times Cited: 15 Cited Reference Count: 62 Riederer, Stephanie K. U. Gigler, Peter Hoegerl, Manuel P. Herdtweck, Eberhardt Bechlars, Bettina Herrmann, Wolfgang A. Kuehn, Fritz E. Kuhn, Fritz/A-3113-2010; Herrmann, Wolfgang/A-3588-2010 Margarete Ammon Stiftung; Wacker AG Dr. Karl Ofele, Prof. Dr. Peter Harter, and Dr. Evangeline Tosh arc gratefully acknowledged for helpful discussions. This work was generously supported by the Margarete Ammon Stiftung (Ph.D. gran...     »