The most important reaction of the<unk> s is the photo-induced scission of a C-Cl bond: :CCl3F → CCl2F. + Cl. The chlorine atom, written often as Cl., behaves very differently from the chlorine molecule (Cl2). The radical Cl. is long-lived in the upper atmosphere, where it catalyzes the conversion of ozone into O2. Ozone absorbs UV-B radiation, so its depletion allows more of this high energy radiation to reach the Earth's surface. Bromine atoms are even more efficient catalysts; hence brominated<unk> s are also regulated.
Chlorofluorocarbon
Trihalomethane
Triphenylchloroethylene
Perfluoroisobutene
Chloroethane
Arsenic pentafluoride
Phenylsilatrane
Triphenylbromoethylene