Diborabutatriene: An Electron‐Deficient Cumulene |
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| Authors: | Julian Böhnke Prof Dr Holger Braunschweig Dr William C Ewing Dr Christian Hörl Thomas Kramer Dr Ivo Krummenacher Dr Jan Mies Dr Alfredo Vargas |
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| Institution: | 1. Institut für Anorganische Chemie, Julius‐Maximilians‐Universit?t Würzburg, Am Hubland, 97074 Würzburg (Germany);2. Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, Sussex (UK) |
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| Abstract: | The complexation of two equivalents of a cyclic (alkyl)(amino)carbene (CAAC) to tetrabromodiborane, followed by reduction with four equivalents of sodium naphthalide, led to the formation of the CAAC‐stabilized linear diboracumulene (CAAC)2B2. The capacity of the CAAC ligand to facilitate B2→CAAC donation of π‐electron density resulted in important differences between this species and a previously reported complex featuring a B?B triple bond stabilized by cyclic di(amino)carbenes, including a longer B? B bond and shorter B? C bonds. Frontier orbital analysis indicated sharing of valence electrons across the entire linear C‐B‐B‐C unit in (CAAC)2B2, which is supported by natural population analysis and cyclic voltammetry. |
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| Keywords: | boron carbenes cumulenes main‐group elements multiple bonds |
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