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Alkene Isomerisation Catalysed by a Ruthenium PNN Pincer Complex

机译:钌PNN钳配合物催化烯烃异构化

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The [Ru(CO) H(PNN)] pincer complex based on a dearomatised PNN ligand (PNN: 2-di-tert-butylphosphinomethyl-6-diethylaminomethylpyridine) was examined for its ability to isomerise alkenes. The isomerisation reaction proceeded under mild conditions after activation of the complex with alcohols. Variable-temperature (VT) NMR experiments to investigate the role of the alcohol in the mechanism lend credence to the hypothesis that the first step in-volves the formation of a rearomatised alkoxide complex. In this complex, the hemilabile diethylamino side-arm can dissociate, allowing alkene binding cis to the hydride, enabling insertion of the alkene into the metal-hydride bond, whereas in the parent complex only trans binding is possible. During this study, a new uncommon Ru-0 coordination complex was also characterised. The scope of the alkene isomerisation reaction was examined.
机译:基于脱芳香化的PNN配体(PNN:2-二叔丁基膦基甲基-6-二乙基氨基甲基吡啶)的[Ru(CO)H(PNN)]钳形复合物的链烯异构化能力得到了检验。配合物用醇活化后,异构化反应在温和条件下进行。可变温度(VT)NMR实验研究了醇在该机理中的作用,从而证实了第一步涉及重新形成烷氧基复合物的假设。在该络合物中,半不稳定的二乙氨基侧臂可以解离,从而使烯烃顺式结合到氢化物上,从而可以将烯烃插入金属氢化物键中,而在母体络合物中,只有反式结合是可能的。在这项研究中,还描述了一种新的不常见的Ru-0配合物。检查了烯烃异构化反应的范围。

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