Thermal Reactions of Polyfluoro-ortho-chloroarenethiols with Tetrafluoroethylene

Co-pyrolysis of 2,5-dichloro-3,4,6-trifluorobenzenethiol, 2-chloro-4-trifluoromethyl-3,5,6-trifluorobenzenethiol, and 3-chloro-2,5,6-trifluoropyridine-4-thiol with tetrafluoroethylene has given, heptafluoro-5- chloro-2,3-dihydrobenzo[b]thiophene, 6-trifluoromethylheptafluoro-2,3-dihydrobenzo[b]thiophene, and heptafluoro- 2H,3H-thieno[2,3-c]pyridine, respectively, as the major products. The reactions of these thiols containing the chlorine atom in the ortho-position to the thiol group differ from that between 4-chloro-2,3,5,6- tetrafluorobenzenethiol and tetrafluoroethylene, the latter one giving perfluoroindane as the major product.