... Volume: Page ... of a fluorovinyl Weinreb amide has been reported from tetrafluoroethane (HFC-134a), albeit in a low 30% yield.(13) An example of the Weinreb−Wittig−Horner reagent (EtO) 2 P(O)CHFC ... 16, NaH, THF, 1.0:2.0:4.0, 18-Crown-6 (6.0), rt, 1.5, 40/60, NA c. ...