Photochemistry of anhydrides. Part 6.—Photolysis of chlorodifluoroacetic anhydride, (CF2ClCO)2O

Abstract

The photolysis of the vapour of chlorodifluoroacetic anhydride, (CF₂ClCO)₂O, has been studied over the range 19–201 °C using 248 nm radiation. Quantum yields of the products CO, CO₂, CF₂ClCF₂Cl and CF₂Cl₂ were measured with and without added quencher. The effective primary process is (CF₂ClCO)₂O +hv→ 2CF₂Cl + CO + CO₂ which is followed by [graphic omitted]

The ratio k_c/k_d is equal to 7.6 at 19 °C and 4.7 at 201 °C, both independent of pressure of anhydride and of perfluoromethylcyclohexane added as a quencher. The reactions of CF₂Cl radicals from various photolytic sources are compared.