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Photochemical Synthesis of a Ladder Diborole: A New Boron-Containing Conjugate Material


  • Funding for this work was provided by NSERC of Canada in the form of a Discovery Grant to W.E.P. B.N. thanks the Deutsche Forschungsgemeinschaft for financial support in the form of a Postdoctoral Fellowship.


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Climbing the ladder: Reductive cyclization of alkynyl haloboranes lead to the bis-benzocycloborabutylidene rather than the expected ladder diborole, despite the former being much less thermodynamically favored. Photochemical conversion to the ladder diborole was, however, quite facile upon irradiation at 254 nm.