Tropospheric transformation products of a series of hydrofluorocarbons and hydrochlorofluorocarbons

The products of the Cl-atom initiated reactions of a series of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) in air have been investigated at 298 K and one atmosphere (740 Torr total pressure) of air. The products observed and quantified and their yields (%) were as follows: from CHF₂Cl (HCFC-22), C(O)F₂ (100%); from CHFCl₂ (HCFC-21), C(O)FCl (100%); from CH₂FCl (HCFC-31), HC(O)F (100%); from CH₃F (HFC-41), HC(O)F (100%); from CH₃CFCl₂ (HCFC-141b), C(O)FCl (100%); from CH₃CF₂Cl (HCFC-142b), C(O)F₂ (100%); from CH₃CHF₂ (HFC-152a), C(O)F₂ (92%); from CHCl₂CF₃ (HCFC-123), CF₃C(O)Cl (98%); from CHFClCF₃ (HCFC-124), CF₃C(O)F (101%); and from CHF₂CF₃ (HFC-125), C(O)F₂ (100%). The reaction mechanisms are discussed.