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:
Dec. 27, 2005
Filed:
Mar. 29, 2004
Sudhir Bavikar, Pune, IN;
Asif Maner, Pune, IN;
Ramesh Kumar Chidambaram, Pune, IN;
Sudalai Arumugam, Pune, IN;
Sivaram Swaminathan, Pune, IN;
Sudhir Bavikar, Pune, IN;
Asif Maner, Pune, IN;
Ramesh Kumar Chidambaram, Pune, IN;
Sudalai Arumugam, Pune, IN;
Sivaram Swaminathan, Pune, IN;
Council of Scientific and Industrial Research, New Delhi, IN;
Abstract
This invention relates to a process for the production of 3,3',4,4′-tetraminobiphenyl (TAB) of formula (1) from non-carcinogenic raw materials, employing Suzuki type biaryl coupling as the key step. More particularly, it relates to a three steps process for the production of TAB comprising biaryl aryl coupling of 2-nitro-4-bromoacetamide (NBA) of formula (2) catalyzed by sulfilimine based palladacycles as catalysts followed by the basic hydrolysis of acetyl group and the reduction of nitro groups with conventional reducing agents.