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:
Jul. 08, 1980
Filed:
Aug. 02, 1978
Applicant:
Inventors:
Assignee:
Chisso Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603191 ;
Abstract
A commercial method for producing 2,3,3-trimethylindolenine useful as an intermediate for cationic dyes, etc., with a high yield is provided, which comprises mixing aniline with 3-chloro-3-methylbutane-2-one in a mixing ratio by mol of 3:1-10:1; reacting the resulting mixture at a temperature of 50.degree.-150.degree. C. for 2-20 hours; thereafter elevating the temperature of the reaction liquid; and maintaining the liquid at a reflux temperature of aniline for 0.5-2 hours to complete the reaction.