Steric effects on acetate-assisted cyclometallation of meta-substituted N-phenyl and N-benzyl imidazolium salts at [MCl2Cp*]2 (M = Ir, Rh),Dalton Transactions

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Steric effects on acetate-assisted cyclometallation of meta-substituted N-phenyl and N-benzyl imidazolium salts at [MCl2Cp*]2 (M = Ir, Rh)
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-08-31 , DOI: 10.1039/d1dt02677a
David L Davies ₁ , Kuldip Singh ₁ , Neringa Tamosiunaite ₁

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meta-Substituted N-phenyl,N′-methyl and N-benzyl,N′-methyl imidazolium salts undergo acetate-assisted cyclometallation to provide mixtures of ortho and para substituted cyclometallated complexes. The effect of the substituents on the isomer ratios is discussed; steric effects are more important in the 6-membered rings derived from the N-benzyl imidazolium salts than 5-membered rings from the N-phenyl salts. Comparisons are made to steric effects with some other common directing groups.

中文翻译：

[MCl2Cp*]2 (M = Ir, Rh) 对间位取代的 N-苯基和 N-苄基咪唑鎓盐的乙酸盐辅助环金属化的空间效应

间取代的N-苯基、N'-甲基和N-苄基、N'-甲基咪唑鎓盐经历乙酸盐辅助的环金属化以提供邻位和对位取代的环金属化配合物的混合物。讨论了取代基对异构体比例的影响；在衍生自N-苄基咪唑鎓盐的 6 元环中，空间效应比衍生自N-苯基盐的5 元环更重要。与一些其他常见的导向组进行空间效应比较。

更新日期：2021-09-08

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