Reactivity of 鈥淟igand-Free鈥?Au+: C鈥揌 and C鈥揅 Activation versus 蟺 Coordination

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• 作者：Nicky Savjani ; Sean P. Bew ; David L. Hughes ; Simon J. Lancaster ; Manfred Bochmann
• 刊名：Organometallics
• 出版年：2012
• 出版时间：April 9, 2012
• 年：2012
• 卷：31
• 期：7
• 页码：2534-2537
• 全文大小：228K
• 年卷期：v.31,no.7(April 9, 2012)
• ISSN：1520-6041

文摘

[(Me₂S)Au]⁺ cations, generated from (Me₂S)AuCl and AgSbF₆ in dichloromethane at 0鈥?0 掳C, serve as sources of solvated Au⁺ (alongside unreactive [Au(SMe₂)₂]⁺), which reacts with the methyl-substituted arenes C₆Me_6鈥?i>nH_n (n = 0鈥?) with C鈥揌 bond cleavage to give the sulfonium salts [C₆Me_5鈥?i>nH_nCH₂SMe₂]⁺. There was no evidence for arene 蟺 coordination to Au⁺ or for the formation of 蟽-bonded Au鈥揵enzyl species. Surprisingly, the reaction of Au⁺ with CH₂Ar₂ leads to C鈥揅 bond cleavage (Ar = 2,4,6-C₆H₂Me₃). The reactions are highly selective for benzylic C鈥揌 and C鈥揅 bonds, whereas metalation of the arene ring is not observed.