Deuterium labelling reveals that 1-cyanobenzosemibullvalene derived from the sensitized irradiation of 2-cyanobenzobarrelene is formed by a di-π-methane rearrangement initiated by vinyl–vinylcano-bridging and not by the benzo–vinylcyano-mechanism proposed by Houk.
C. O. Bender and E. H. King-Brown, J. Chem. Soc., Chem. Commun., 1976, 878 DOI: 10.1039/C39760000878
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