Temperature-Dependent Nuclearity in Bis(benzimidazoyl) Nickel Complexes and Their Catalysis toward Conjugate Addition of Thiophenols to α,β-Enones

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• 作者：Way-Zen Lee ; Tzu-Li Wang ; Huan-Sheng Tsang ; Cheng-Yuan Liu ; Chien-Tien Chen ; Ting-Shen Kuo
• 刊名：Organometallics
• 出版年：2009
• 出版时间：January 26, 2009
• 年：2009
• 卷：28
• 期：2
• 页码：652-655
• 全文大小：158K
• 年卷期：v.28,no.2(January 26, 2009)
• ISSN：1520-6041

文摘

The nuclearity of two previously prepared nickel complexes, [LNiCl(μ-Cl)]₂·2CH₃OH (1) and L′NiCl₂ (2) (L = bis(1-methylbenzimidazoyl-2-methyl)amine and L′ = bis(1-methylbenzimidazoyl-2-methyl)-10-camphorsulfonamide), was found to be temperature-dependent. Mononuclear [LNi(CH₃OH)₂Cl]Cl·2H₂O (3) and dinuclear [L′NiCl(μ-Cl)]₂ (4) were obtained as crystals at −20 °C. It is noteworthy that complex 2 can catalyze the conjugate addition of thiophenols to α,β-enones in high yields; in contrast, the same reaction catalyzed by NiCl₂·THF or complex 3 was far less effective.