An Aluminum Dihydride Working as a Catalyst in Hydroboration and Dehydrocoupling

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• 作者：Zhi Yang ; Mingdong Zhong ; Xiaoli Ma ; Karikkeeriyil Nijesh ; Susmita De ; Pattiyil Parameswaran ; Herbert W. Roesky
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：138
• 期：8
• 页码：2548-2551
• 全文大小：313K
• ISSN：1520-5126

文摘

The well-defined aluminum dihydride LAlH₂ (L = HC(CMeNAr)₂, Ar = 2,6-Et₂C₆H₃) (1) operates in catalysis like a transition metal complex. The catalytic activity of 1 for hydroboration of terminal alkynes was investigated. Furthermore, catalyst 1 effectively initiated the dehydrocoupling of boranes with amines, thiols, and phenols, respectively, to form compounds with B–E bonds (E = N, S, O) under elimination of H₂. Quantum mechanical calculations indicate that hydroboration and dehydrocoupling reactions occur via three consecutive cycloaddition reactions involving the activation of the X–H (X = Al, B, C, and O) σ-bonds.