Free radical addition to olefins. Part 10.—Addition of dibromofluoromethyl radicals to fluoroethylenes

Abstract

The gas phase photochemical addition of tribromofluoromethane to a series of fluoro-olefins has been studied over a range of temperatures. The products included those from addition of dibromofluoromethyl radicals to the olefins as well as cyclopropanes from addition of bromofluorocarbene. The mechanism of the reaction is discussed, and Arrhenius parameters for the addition of dibromofluoromethyl radicals are derived from competitive experiments with each olefin and ethylene. [graphic omitted] Activation energies, relative to ethylene, in kcal mol^–1, A-factors in l. mol^–1 s^–1(1 cal = 4.184 J).