Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2005-12-27
2005-12-27
Barts, Samuel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
Reexamination Certificate
active
06979749
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.
REFERENCES:
patent: 2895948 (1959-07-01), Brinker et al.
patent: 3174947 (1965-03-01), Marvel et al.
patent: 5317078 (1994-05-01), Connell et al.
patent: 6187231 (2001-02-01), Sansone et al.
Arumugam Sudalai
Bavikar Sudhir
Chidambaram Ramesh Kumar
Maner Asif
Swaminathan Sivaram
Barts Samuel
Council of Scientific and Industrial Research
Nixon & Peabody LLP
Studebaker Donald R.
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