Reaction of various σ-homo-o-benzoquinones, e. g.42, with BF3·Et2O results in the formation of the tropolonoboron difluoride derivatives, e. g.43, of the isomeric α-tropolones, e.g. isopygmaein 33.
M. G. Banwell and M. P. Collis, J. Chem. Soc., Chem. Commun., 1991, 1343 DOI: 10.1039/C39910001343
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