Process for preparing 3-fluoro-4,6-dichlorotoluene

Details Process for preparing 3-fluoro-4,6-dichlorotoluene Process for preparing 3-fluoro-4,6-dichlorotoluene

1995-12-13

1997-11-04

Siegel, Alan

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

Organic compounds

Halogen containing

C07C 2200

Patent

active

056842171

ABSTRACT:
3-Fluoro-4,6-dichlorotoluene can be prepared in a particularly favourable manner by first chlorinating 3-fluorotoluene at low temperature in the presence of a Friedel-Crafts catalyst and a heterocyclic cocatalyst to give a mixture containing 3-fluoro-4-chlorobenzene and 3-fluoro-6-chlorobenzene, and subsequently, without intermediate isolation, further chlorinating this mixture, at higher temperature, after addition of further Friedel-Crafts catalyst and further heterocyclic cocatalyst, to give 3-fluoro-4,6-dichlorotoluene.

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patent: 4990707 (1991-02-01), Mais et al.
patent: 5105036 (1992-04-01), Mais et al.
patent: 5475164 (1995-12-01), Bussmann

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