Process for the preparation of 2,4-dichlorofluorobenzene

Details Process for the preparation of 2,4-dichlorofluorobenzene Process for the preparation of 2,4-dichlorofluorobenzene

1992-10-08

1993-07-13

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570143, C07C 2513, C07C 1710

Patent

active

052275450

ABSTRACT:
Process for the preparation of 2,4-dichlorofluorobenzene in high yield and purity without intermediate separation of the isomers formed,(1) by nitrating 1 mol of fluorobenzene to give nitrofluorobenzene using a mixture comprising 35 to 65 parts by weight of 50 to 90% strength sulfuric acid and 35 to 65 parts by weight of a nitrating acid comprising 35 to 55 parts by weight of 95 to 98% strength sulfuric acid and 45 to 65 parts by weight of 96 to 98% strength nitric acid, with the proviso that 0.8 to 2.0 equivalents of the nitrating agent NO.sub.2.sup.+ are used per mol of fluorobenzene, at 20.degree. to 90.degree. C., (2) allowing 25 g to 150 g of chlorine, in the presence of a ring chlorinating catalyst, to act on each 100 g of the crude nitrofluorobenzene mixture obtained, at 20.degree. to 100.degree. C., and (3) allowing about 18 g to about 203 g of chlorine or equivalent amounts of a chlorine releasing agent to act on each 100 g of the crude chlorofluoronitrobenzene mixture obtained, after removal of the ring chlorinating catalyst, at 110.degree. to 220.degree. C., and isolating the 2,4-dichlorofluorobenzene.

REFERENCES:
patent: 3277192 (1966-10-01), Fielding
patent: 5157169 (1992-10-01), Patton

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