Fluorinated hydroquinones via annulation of fluorovinylcarbene complexes with alkynes
Abstract
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.