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首页> 外文期刊>Chemistry: A European journal >Ruthenium carbene complexes bearing an anionic carboxylate chelated to a hemilabile ligand
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Ruthenium carbene complexes bearing an anionic carboxylate chelated to a hemilabile ligand

机译：载有与半不稳定配体螯合的阴离子羧酸盐的钌卡宾配合物

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摘要

A series of bidentate ruthenium-based NHC complexes with the general formula [(H(2)IMes)(kappa(2)-L-COO)ClRu = CHPh)], where L is either PAr3, HNR2, or ROR, were prepared from commercially available [(H(2)IMes)(PCY3)Cl2Ru(CHPh)] (2) and the appropriate ligand. The catalytic activities of the complexes were evaluated in ring-closing metathesis reactions. The type of donor ligand has a major impact on both the initiation behavior and also the stability of the complexes. Upon addition of CuCl to the reaction mixture the initiation is improved for the phosphine or amine containing chelates. For the PO-chelate, the fast initiation was followed by decomposition. In the case of the N,O-containing chelate, a stable catalytic system was achieved. Trapping experiments support that the nitrogen lone-pair reversibly coordinates CuCl during the reaction.
机译：制备了一系列通式为[[H（2）IMes）（kappa（2）-L-COO）ClRu = CHPh）的双齿钌基NHC络合物，其中L为PAr3，HNR2或ROR购自[[H（2）IMes）（PCY3）Cl2Ru（CHPh）]（2）和合适的配体。在闭环复分解反应中评估了配合物的催化活性。供体配体的类型对引发行为以及配合物的稳定性都有重要影响。在将CuCl添加到反应混合物中后，对于含膦或胺的螯合物的引发被改善。对于PO-螯合物，快速引发后进行分解。在含有N，O的螯合物的情况下，获得了稳定的催化体系。捕集实验支持在反应过程中氮孤对可逆地协调CuCl。

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