The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 1981
Filed:
Nov. 09, 1979
Claus D Weis, Pfeffingen, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A process for the manufacture of 4,5-dichloro-2-(4-chlorophenoxy)phenol by selective chlorination of 2-phenoxyanisole with 3 to 5 molar equivalents of chlorine, in the temperature range between -10.degree. and +50.degree. C., preferably between 0.degree. and 30.degree. C., in a lower halogenated aliphatic hydrocarbon, a lower aliphatic nitrile, in dimethyl formamide, dimethylmethanephosphonate or methanol, preferably in dimethyl formamide, dimethylmethanephosphonate, methanol, acetonitrile, propionitrile, chloroform, methylene chloride, 1,2-dichloroethane or tetrachloroethane, and demethylation of the 4,5-dichloro-2-(4-chlorophenoxy)anisole obtained as intermediate with an acid.