Transition Metal-Stabilized Arenium Cations: Protonation of Arenes Dihapto-Coordinated to -Basic Metal Fragments

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• 作者：Joseph M. Keane ; Mahendra D. Chordia ; Christopher J. Mocella ; Michal Sabat ; Carl O. Trindle ; and W. Dean Harman
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：June 2, 2004
• 年：2004
• 卷：126
• 期：21
• 页码：6806 - 6815
• 全文大小：179K
• 年卷期：v.126,no.21(June 2, 2004)
• ISSN：1520-5126

文摘

A series of metal complexes was synthesized in which arenes were dihapto-coordinated to -basicmetal fragments having the general form {TpM(-acid)(L)}, where Tp = hydridotris(pyrazolyl)borate, M =rhenium, molybdenum, or tungsten, -acid = CO or NO⁺, and L = 1-methylimidazole, 1-butylimidazole,pyridine, or trimethylphosphine. The arene complexes were shown to be significantly more basic than theanalogous pentaammineosmium(II) arene complexes and were protonated by moderate acids to giveremarkably stable ² and ³ arenium cation complexes. A crystal structure of [TpRe(CO)(MeIm)(5,6-²-2H-anisolium)](OTf) confirmed the ² coordination of the anisolium ligand, but suggests a weak long-rangeinteraction between the metal and C1 of the anisolium.