Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1994-01-21
1995-12-26
Brust, Joseph Paul
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
558424, 558425, 562493, C07C25314
Patent
active
054789630
ABSTRACT:
The present invention describes the novel intermediates 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-difluorobenzonitrile, 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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Patent Abstract of Japan, Publication No. JP3090057, Application No. JP890225246, Apr. 16, 1991.
Papenfuhs Theodor
Pfirmann Ralf
Brust Joseph Paul
Hoechst Aktiengesellschaft
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