Preparation of 3,4-dichlorobenzotrihalides

Details Preparation of 3,4-dichlorobenzotrihalides Preparation of 3,4-dichlorobenzotrihalides

1984-08-30

1988-09-06

Hollrah, Glennon H.

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

Organic compounds

Halogen containing

570191, 570208, 570210, 261151, C07C 1712

Patent

active

047695030

ABSTRACT:
A process for the preparation of 3,4-dichlorobenzotrihalides of the formula I ##STR1## where X is fluorine or chlorine, by reacting the corresponding 4-monochlorobenzotrihalides with chlorine gas in the presence of a catalytic amount of a Lewis acid, wherein the reaction mixture is recycled by means of a pump in a circulatory apparatus with static mixers and the amount of chlorine equivalent to the conversion of the corresponding 4-monochlorobenzotrihalide is introduced at 20.degree.-120.degree. C.

REFERENCES:
patent: 4023958 (1977-05-01), Rohe et al.
patent: 4191711 (1980-03-01), Lenthe et al.
patent: 4207180 (1980-06-01), Chang
patent: 4691066 (1987-09-01), Inoue et al.
Houben-Weyl "Methoden der Organischen Chemie" vol. 5/3 p. 652.

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