Process for the preparation of 2,3,4,5,-tetrafluorobenzene...

Details Process for the preparation of 2,3,4,5,-tetrafluorobenzene... Process for the preparation of 2,3,4,5,-tetrafluorobenzene...

C - Chemistry, Metallurgy

07

C

C07C 255/50 (2006.01) C07C 17/20 (2006.01) C07C 25/13 (2006.01) C07C 51/62 (2006.01) C07C 63/70 (2006.01) C07C 253/30 (2006.01)

Patent

CA 2247231

2,3,4,5-tetrafluorobenzene derivatives can be obtained in a particularly advantageous manner by reacting the corresponding chloro-benzene or (chloro, fluoro)-benzene derivatives with a fluoridating agent in the presence of a solvent and a catalyst at elevated temperature. which comprises carrying out the reaction initially under temperature and pressure conditions such that the respective 2,3.4,5-tetrafluoro-benzene derivative continuously distills off through a column, and subsequently setting temperature and pressure conditions such that residual fractions of the 2,3,4,5- tetrafluorobenzene derivative distill off with the corresponding 2.3,4-trifluoro- 5-chloro compound.

On peut obtenir des dérivés du 2,3,4,5-tétrafluorobenzène d'une manière particulièrement avantageuse en faisant réagir les dérivés du chlorobenzène ou du chlorofluorobenzène correpondant avec un agent de fluoration en présence d'un solvant et d'un catalyseur, à température élevée. Cette méthode comprend initialement la réalisation de la réaction dans des conditions de pression et de température telles que les dérivés respectifs du 2,3,4,5-tétrafluorobenzène puissent être extraits en continu d'une colonne de distillation, puis le réglage ultérieur des conditions de température et de pression de telle manière que les fractions résiduelles de dérivés du 2,3,4,5-tétrafluorobenzène soient distillées avec le composé 2,3,4-trifluoro-5-chloro correspondant.

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