Difluorocarbene reacted with several 2-benzylidenecyclohexanones giving phenylfluorofurans: trans-1-benzoyl-2,2-difluoro-3-phenylcyclopropane, when heated for 1½ h at 216°, gave 3-fluoro-2,5-diphenylfuran in high yield.
M. Derenberg and P. Hodge, J. Chem. Soc. D, 1971, 233 DOI: 10.1039/C29710000233
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