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. 16, 2011
Filed:
Mar. 11, 2008
Ravi Kant Shukla, Maharashtra, IN;
Lourduswamy Emmanuvel, Maharashtra, IN;
Chidambaram Rameshkumar, Maharashtra, IN;
Suryavanshi Gurunath, Maharashtra, IN;
Arumugam Sudalai, Maharashtra, IN;
Swati Shantikumar Kulkarni, Maharashtra, IN;
Swaminathan Sivaram, Maharashtra, IN;
Ravi Kant Shukla, Maharashtra, IN;
Lourduswamy Emmanuvel, Maharashtra, IN;
Chidambaram Rameshkumar, Maharashtra, IN;
Suryavanshi Gurunath, Maharashtra, IN;
Arumugam Sudalai, Maharashtra, IN;
Swati Shantikumar Kulkarni, Maharashtra, IN;
Swaminathan Sivaram, Maharashtra, IN;
Council of Scientific and Industrial Research, New Delhi, IN;
Abstract
The present invention provides a reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3'-diaminobenzidine and its analogues. The present invention also provides to a process for the preparation of a reusable transition metal complex catalyst. The present invention further provides a process for the preparation of 3,3′-diaminobenzidine (DAB) or 3,3′,4,4′ Tetraminobiphenyl (TAB) using reusable transition metal complex catalyst. The high quality 3,3′-diaminobenzedine (DAB) and its analogues are prepared by coupling 4-halo-2-nitroaniline to 3,3′-dinitrobenzidine (DNB) using transition metals as catalysts followed by reduction of 3,3′-dinitrobenzidine to the corresponding substituted 3,3′-diaminobenzidine of formula 1 in high yields.