{(COD)Ru[RNC(H)–C(H)C(Ph)]2} (RMe, Et): The first structurally characterized mononuclear ruthenium complexes with enyl-imino ligands and their relevance in ruthenium catalyzed C–H activation reactions
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- 作者：Linda Schweda ; Andreas Nader ; Roberto Menzel ; Tobias Biletzki ; Christopher Johne ; Helmar Gö ; rls ; Wolfgang Imhof
- 关键词：Ruthenium ; Imines ; C– ; H activation ; Catalysis ; Lactams ; X-ray
- 刊名：Journal of Organometallic Chemistry
- 出版年：2010
- 出版时间：15 August 2010
- 年：2010
- 卷：695
- 期：18
- 页码：2076-2082
- 全文大小：850 K
文摘
The reaction of α,β-unsaturated imines with [(1,5-cyclooctadiene)-bis(2-methylallyl)-ruthenium(II)] leads to the formation of mononuclear ruthenium complexes of the general formula {(COD)Ru[RNC(H)–C(H)C(Ph)]2}. In these complexes the imine ligands are deprotonated in β-position with respect to the imine double bond and coordinate as an enyl-imino ligand. In the case of R = Me, Et the corresponding compounds have been characterized by X-ray crystallography. The relevance of these complexes with respect to ruthenium catalyzed C–C coupling reactions of the same α,β-unsaturated imines is demonstrated by the structural analysis of another mononuclear ruthenium complex in which two imine ligands are reductively coupled (R = Cy). [(1,5-Cyclooctadiene)-bis(2-methylallyl)-ruthenium(II)] also turns out to be a highly effective precatalyst in the reaction of the respective imines with carbon monoxide and ethylene to produce heterocyclic compounds.