Synergic Effects Between N-Heterocyclic Carbene and Chelating Benzylidene鈥揈ther Ligands Toward the Initiation Step of Hoveyda鈥揋rubbs Type Ru Complexes
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- 作者：David J. Nelson ; Pierre Queval ; Mathieu Rouen ; Magaly Magrez ; Lo茂c Toupet ; Fr茅d茅ric Caijo ; Etienne Borr茅 ; Isabelle Laurent ; Christophe Cr茅visy ; Olivier Basl茅 ; Marc Mauduit ; Jonathan M. Percy
- 刊名：ACS Catalysis
- 出版年：2013
- 出版时间：February 1, 2013
- 年：2013
- 卷：3
- 期：2
- 页码：259-264
- 全文大小：366K
- 年卷期：v.3,no.2(February 1, 2013)
- ISSN：2155-5435
文摘
Synergic effects between ancillary N-heterocyclic carbenes [(1,3-bis(2,4,6-trimethylphenyl)-1,3-imidazoline-2-ylidene or 1,3-bis(2,6-diisopropylphenyl)-1,3-imidazoline-2-ylidene] and chelating benzylidene鈥揺ther ligands were investigated by studying initiation rates and kinetic profiles of Hoveyda鈥揋rubbs (HG) type Ru complexes. A newly designed Ru-benzylidene-oxazinone precatalyst <b>4b> was compared with Grela and Blechert complexes bearing modified isopropyloxy chelating leaving groups and with the standard HG complex to understand how the ancillary and the leaving ligands interact and influence the catalytic activity.<br>