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.