Addition of CF2Cl· radicals to cyclic olefines

Abstract

The addition of CF₂Cl· radicals to fluorinated cyclopentenes and cyclohexenes has been studied by the photolysis at 313 nm of mixtures of 1,3-dichlorotetrafluoroacetone and the substrate molecule at various temperatures. The addition is reversible and the energy of activation for addition depends upon the structure of the cyclic olefine. When the substrate molecule contains a hydrogen atom, the formation of CF₂HCl may proceed either by direct abstraction or by disproportionation following addition of a CF₂Cl· radical to the double bond, the route depending upon the position of the hydrogen atom within the substrate molecule.