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:
Sep. 25, 1990
Filed:
May. 23, 1988
Reinhard G Hanreich, Basle, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
In accordance with a novel process, 2-(2-chloroethoxy)-benzenesulfonamide of formula I ##STR1## is prepared by etherification of 4-chlorophenol of formula II ##STR2## with ethylene carbonate and chlorination of the resulting 4-(2-hydroxyethoxy)-chlorobenzene of formula III ##STR3## with phosgene or thionyl chloride to give 4-(2-chloroethoxy)-chlorobenzene of formula IV ##STR4## which is converted with chlorosulfonic acid ClSO.sub.3 H and sodium hydroxide to the sulfonic acid sodium salt of formula V ##STR5## which is hydrogenated to the compound of formula VI ##STR6## which is subsequently reacted with phosgene to the sulfonic acid chloride of formula VII ##STR7## which is reacted with amonia to the sulfonamide of formula I.