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:
Oct. 19, 2004
Filed:
May. 14, 2002
Marc Thommen, Toffen, SE;
Andreas Hafner, Gelterkinden, SE;
Frédëric Brunner, Chézard, SE;
Hans-Jörg Kirner, Pratteln, DE;
Roman Kolly, Allschwill, SE;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
The present invention relates to a process for the preparation of compounds of formula (1), in which R , R and R independently of one another are hydrogen, halogen , trifluoromethyl of or C -C alkoxy, wherein a compound of formula (2), in which R , R and R are as defined in formula (1), is reacted with methlyamine in the presence of a non-alcoholic solvent and, if desired, in the presence of a sulfonic acid catalyst to give the compound of formula (2) and, if desired, is subject to purification by recrystallization.