Pentacarbonyl[(E)-2,3-difluoro-1-methoxyhept-2-en-1-ylidene]chromium, accessible in few steps from the industrial monomer chlorotrifluoroethene viathe classical Fischer procedure, reacts with diphenylacetylene to give 2-n-butyl-3-fluoro-4-methoxy-5,6-diphenylphenol in an unprecedented tandem carbene annulation-efluorination process.
K. H. Dötz and J. Glänzer, J. Chem. Soc., Chem. Commun., 1993, 1036 DOI: 10.1039/C39930001036
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