From an Electron‐Rich Bis(boraketenimine) to an Electron‐Poor Diborene1. Issue 15 (17th February 2015)

• Record Type: Journal Article
• Authors: Böhnke, Julian; Braunschweig, Holger; Dellermann, Theresa; Ewing, William C.; Kramer, Thomas; Krummenacher, Ivo; Vargas, Alfredo
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 15(2015)
• Page Start: 4469
• Page End: 4473
• Publication Date: 2015-02-17
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201412006
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The reaction of the bisboracumulene (CAAC)₂B₂ (CAAC=1‐(2, 6‐diisopropylphenyl)‐3, 3, 5, 5‐tetramethylpyrrolidin‐2‐ylidene) with excess tert‐butylisocyanide resulted in complexation of the isocyanide at boron. Though this compound might be formally drawn with a lone pair on boron, these electrons are highly delocalized throughout a conjugated π‐network consisting of the π‐acidic CAAC and isocyanide ligands. Heating this compound to 110 °C liberated the organic periphery of both isocyanide ligands, yielding the first example of a dicyanodiborene. Cyclic voltammetry conducted on this diborene indicated the presence of reduction waves, making this compound unique among diborenes, which are otherwise highly reducing.</p> </abstract>