Preparation of perfluoroalkanecarboxylic acids and novel perfluoroalkanedichloroethylenes obtained
AssigneeAtochem
InventorsHubert Blancou, Auguste Commeyras, Robert Teissedre
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Abstract
A process for preparing perfluoroalkanecarboxylic acids, wherein a perfluoroiodoalkane, R.sub.F I, is reacted with trichloroethylene in an acidic solvent in the presence of zinc, and the 2-perfluoroalkyl-1,1-dichloroethylene thus obtained is oxidized with the aid of permanganate, R.sub.F representing a straight chain or branched perfluoro radical containing one to 20 carbon atoms, together with certain novel perfluoroalkyldichloroethylenes having four or more carbon atoms so obtained.
Claims8
A process for the preparation of perfluoroalkanecarboxylic acids having the formula R.sub.F COOH, which process comprises reacting a perfluoroiodoalkane having the formula R.sub.F I with trichloroethylene in an acidic medium in the presence of zinc to form an intermediate 2-perfluoroalkyl-1,1-dichloroethylene having the formula R.sub.F CH.dbd.CCl.sub.2, and oxidizing the intermediate in a basic medium with an alkali metal permanganate at a temperature of at least 80.degree. C., wherein R.sub.F represents a linear or branched chain perfluoroalkyl group having from one to 20 carbon atoms.
Dependencies are inferred from the claim text.