Carbonyl fluoride → 4-Chloro-2-(trifluoromethyl)phenyl carbamic fluoride

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4-Chloro-2-(trifluoromethyl)phenyl carbamic fluoride was prepared in situ by the reaction of 221 parts of 4-chloro-2-(trifluoromethyl)-isocyanatobenzene and 380 parts of hydrogen fluoride added over a period of about 15 minutes at about 4° C. The reaction mixture was then sealed in a polytetrafluoroethylene reactor, heated to about 24° C. and maintained at about that temperature, with agitation, for about 96 hours. The reactor was then opened to atmospheric pressure and most of the hydrogen fluoride and carbonyl fluoride gases removed. Analysis of the remaining organic product by gas chromatographic techniques, using n-pentadecane as an internal standard, indicated as yield of 55 parts of 4-chloro-2-(trifluoromethyl)benzenamine.

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