2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,...

Details 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,... 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,...

C - Chemistry, Metallurgy

07

C

C07C 255/49 (2006.01) C07C 51/08 (2006.01) C07C 63/70 (2006.01) C07C 255/50 (2006.01)

Patent

CA 2113973

Abstract of the Disclosure: 2,3-Difluoro-6-nitrobenzonitrile and 2 chloro-5,6-di- fluorobenzonitrile, process for their preparation and their use for the preparation of 2,3,6 trifluorobenzoic acid The present invention describes the novel intermediates 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-di- fluorobenzonitrile, a process for their preparation and their advantageous use for the preparation of 2,3,6- trifluorobenzoic acid, which in turn is a valuable intermediate for the preparation of insecticides and antibacterial agents. The intermediates according to the invention are prepared from 2,3,4-trifluoronitrobenzene by fluorine/cyanide exchange and subsequent denitrating chlorination. 2,3,6-Trifluorobenzoic acid can be prepared from the novel intermediates, in a manner known per se in the literature, by simple chlorine/fluorine exchange and subsequent hydrolysis in a process which overall is industrially advantageous and economically favorable.

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