Competition for Hydride Between Silicon and Boron: Synthesis and Characterization of a Hydroborane-Stabilized Silylium Ion |
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Authors: | Haopeng Gao Dr Robert Müller Dr Elisabeth Irran Dr Hendrik F T Klare Prof Dr Martin Kaupp Prof Dr Martin Oestreich |
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Institution: | Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany |
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Abstract: | Potent main-group Lewis acids are capable of activating element-hydrogen bonds. To probe the rivalry for hydride between silylium- and borenium-ion centers, a neutral precursor with the hydrosilane and hydroborane units in close proximity on a naphthalene-1,8-diyl platform was designed. Abstraction of one hydride leads to a hydroborane-stabilized silylium ion rather than a hydrosilane-coordinated borenium ion paired with B(C6F5)4]− or HCB11Cl11]− as counteranions. Characterization by multinuclear NMR spectroscopy and X-ray diffraction supported by DFT calculations reveals a cationic, unsymmetrical open three-center, two-electron (3c2e) Si−H−B linkage. |
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Keywords: | bidentate interaction borenium ions density functional calculations Lewis acids silylium ions |
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