Process for the production of aromatic trifluoromethyl compounds

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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C07C 2514

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040803929

ABSTRACT:
An improved process for the production of aromatic trifluoromethyl compounds of the benzene series by conversion of the corresponding trichloromethyl compound with hydrogen fluoride. The aromatic trichloromethyl compound of the benzene series is converted in the presence of antimony pentachloride, which is a catalyst, in a quantity, related to the quantity of the trichloromethyl compound, of 200 to 700 ppm per trichloromethyl group in the trichloromethyl compound, with a stoichiometric quantity, or at most a 2 percent excess, of hydrogen fluoride. The conversion is conducted at a pressure of 20 to 45 atm., at a temperature of 60.degree. to 75.degree. C. and with intermixing which is characterized by a Reynolds number between 50,000 and 80,000. Yields of around 98 percent are achieved.

REFERENCES:
patent: 2562159 (1951-07-01), Wodcik et al.
patent: 2654789 (1953-10-01), Ligett
patent: 3950445 (1976-04-01), Ryf
McBee et al., (I), 69 JACS (1947), pp. 947-950.
McBee et al., (II), Prepn., Properties & Technology of Fluorine & Org. Fluoro Compds., (Slesser, Editor) 1st Ed., McGraw Hill, New York (1951).

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