Product distributions from the reaction of 3, 3-difluorotetrachloropropene (la) at 50" with aluminum chloride and bromide, titanium tetrachloride, and antimony pentachloride were determined. The aluminum and titanium halides were converted to the fluorides by the reaction; the aluminum fluoride so formed was shown to catalyze the disproportionation of la. l-Bromo-1, 2-dichloro-3, 3, 3-trifluoropropene(8) was formed in the reaction with ...