Patent · US Expired

Preparation of 3,4-dichlorobenzotrihalides

US4769503A · kind A · utility

1Cited by

4References

5Claims

0Family size

Assignee

BASF SE

Inventors

Adolf Parg · Bad Dürkheim, DE
Gerd Husslein · Bad Dürkheim, DE
Gerhard Hamprecht · Weinheim, DE

Key dates

Filing date	Aug 30, 1984
Grant date	Sep 6, 1988
Priority date	—
Expiry date	Aug 30, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/12
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.