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Activation of H₂ and Et₃SiH by the Borinium Cation [Mes₂B]⁺: Avenues to Cations [MesB(μ-H)₂(μ-Mes)BMes]⁺ and [H₂B(μ-H)(μ-Mes)B(μ-Mes)(μ-H)BH₂]⁺

Author:
Bamford, Karlee L., Qu, Zheng-Wang, Stephan, Douglas W.
Source:
Journal of the American Chemical Society 2019 v.141 no.15 pp. 6180-6184
ISSN:
1520-5126
Subject:
Bronsted acids, boron, cations, hydrogen
Abstract:
Reaction of dihydrogen and the borinium cation salt [Mes₂B][B(C₆F₅)₄] gave an arene-stabilized mesityl-borenium cation, which isotopically scrambles HD. Similarly, reaction with triethylsilane gave the diboranium cation [MesB(μ-H)₂(μ-Mes)BMes]⁺ featuring three bridge-bonds between two boron centers. Reaction of same (Mes₂BH)₂ with Brønsted acid also afforded the same diboranium whereas the corresponding reaction with (MesBH₂)₂ yielded the triboron cation [H₂B(μ-H)(μ-Mes)B(μ-Mes)(μ-H)BH₂]⁺.
Agid:
6373469