Synthesis of fluorovinyl pyrazolyl (thio)ethers by the reaction of gem-difluoroalkenes with pyrazolin-5-ones (thiones)

A mild and efficient method for the preparation of fluorovinyl pyrazolyl ethers and thioethers by the reaction of gem-difluoroalkenes having aryl substituents with pyrazolin-5-ones and pyrazolin-5-thiones, respectively, in the presence of t-BuOK is described. (C) 2015 Elsevier B.V. All rights reserved.