A family of [CpRu(PP)(MeCN)]PF₆ complexes (2 a–e and 4) were prepared in which the bis‐phosphine ligand contains a pendent tertiary amine in the second‐coordination sphere. 2 a–e contain P^Ph₂N^R′₂ ligands with two amine groups as the pendent base. Complex 4 has the P^Ph₂N^Ph₁ ligand with only one pendent amine. The catalytic performance of 2 a–e and 4 were assessed in the cyclization of 2‐ethynyl aniline and 2‐ethynylbenzyl alcohol. It was revealed that the positioning of the pendent amine near the metal active site is essential for high catalyst performance. A comparison of P^Ph₂N^R′₂ catalysts (2 a–e) showed minimal difference in performance as a function of pendent amine basicity. Rather, only a threshold basicity – in which the pendent amine was more basic than the substrate – was required for high performance.

中文翻译：

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催化剂下垂基对炔基胺环化的影响

制备了一个[CpRu（PP）（MeCN）] PF ₆配合物（2 a – e和4），其中双膦配体在第二配位领域包含一个侧基叔胺。2 - ë含有P^博士₂ Ñ ^R' _2点具有两个胺基团作为侧基的配体。配合物4具有仅具有一种侧胺的P ^Ph ₂ N ^Ph ₁配体。2 a – e和4的催化性能在2-乙炔基苯胺和2-乙炔基苄醇的环化中进行了评估。已经发现，侧链胺在金属活性位点附近的定位对于高催化剂性能是必不可少的。P的比较^博士₂ Ñ ^R' _2种催化剂（2 - ë）显示性能最小差作为侧胺碱度的函数。而是，仅需要阈值碱度（其中的侧链胺比底物更碱性）即可实现高性能。