Isolation and Characterization of Crystalline, Neutral Diborane(4) Radicals

Diaryldihalodiboranes(4) were reacted with bis(amidinato)‐ and bis(guanidinato)silylenes to generate the first neutral diborane‐centered radicals. These formally non‐aromatic 5π electron systems are stable in the solid state as well as in solution and were characterized by solid‐state structure dete...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2018-08, Vol.57 (33), p.10752-10755
Main Authors: Seufert, Jens, Welz, Eileen, Krummenacher, Ivo, Paprocki, Valerie, Böhnke, Julian, Hagspiel, Stephan, Dewhurst, Rian D., Tacke, Reinhold, Engels, Bernd, Braunschweig, Holger
Format: Article
Language:English
Subjects:
Benzoquinone
boron–boron bonds
Diborane
diboranes
heterocycles
Mass spectrometry
Mass spectroscopy
Quinones
Radicals
reduction
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Summary:Diaryldihalodiboranes(4) were reacted with bis(amidinato)‐ and bis(guanidinato)silylenes to generate the first neutral diborane‐centered radicals. These formally non‐aromatic 5π electron systems are stable in the solid state as well as in solution and were characterized by solid‐state structure determination, high‐resolution mass spectrometry, and EPR spectroscopy. The reactivity of one of these radicals with the oxidant 1,4‐benzoquinone led to ring‐opening and B−O bond formation. Solid as a rock: Diaryldihalodiboranes(4) were reacted with bis(amidinato)‐ and bis(guanidinato)silylenes to generate the first neutral diborane‐centered radicals. These formally non‐aromatic 5π electron systems are stable in the solid state as well as in solution.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201804048