Intramolecular C(sp3)鈥揌 Bond Activation Reactions of Low-Valent Cobalt Complexes with Coordination Unsaturation

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• 作者：Zhenbo Mo ; Dake Chen ; Xuebin Leng ; Liang Deng
• 刊名：Organometallics
• 出版年：2012
• 出版时间：October 22, 2012
• 年：2012
• 卷：31
• 期：20
• 页码：7040-7043
• 全文大小：242K
• 年卷期：v.31,no.20(October 22, 2012)
• ISSN：1520-6041

文摘

Intramolecular C(sp³)鈥揌 bond activation reactions mediated by low-valent cobalt, both Co(I) and Co(0), have been observed in the reactions of the three-coordinate cobalt complex [Co(IMes)₂Cl] (IMes = 1,3-dimesitylimidazol-2-ylidene) with alkylation reagents and sodium amalgam. The reactions with alkylation reagents gave [Co(IMes)(IMes鈥?(N₂)], featuring a metalated IMes鈥?anion, whereas the one-electron-reduction reaction afforded [Co(IMes鈥?₂]. The Co(II) complex can react with CO, isocyanide, and a diazo compound to furnish interesting cobalt complexes bearing functionalized N-heterocyclic carbene ligands. The establishment of these conversions demonstrates the capability of low-valent cobalt with coordination unsaturation to mediate C(sp³)鈥揌 bond activation and functionalization.