Ring Expansion of 7-Boranorbornadienes by Coordination with an N-Heterocyclic Carbene

H Braunschweig, J Maier, K Radacki, J Wahler

Index: Braunschweig, Holger; Maier, Jonathan; Radacki, Krzysztof; Wahler, Johannes Organometallics, 2013 , vol. 32, # 21 p. 6353 - 6359

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Citation Number: 10

Abstract

In the context of our longstanding interest in subvalent boron compounds, we targeted the liberation of a carbene-stabilized borylene from a suitable organoboron precursor. For this purpose, we tested 7-borabicyclo [2.2. 1] hepta-2, 5-dienes (or 7-boranorbornadienes in short) obtained from facile [4+ 2] cycloaddition of boroles and alkynes. By formation of a Lewis adduct with an N-heterocyclic carbene (NHC), we intended to block previously ...