Patent ID: 6979749

Claim:
A process for producing 3,3′,4,4′-tetraminobiphenyl (TAB) of formula 1 from 2-nitro-4-bromoacetamide (NBA) of formula 2, said process comprising the steps of (a) reacting the substrate of formula 2 with nitro acetamido phenyl boronic acid (NABP) of formula 3 in the presence of a catalyst, a solvent and a base to obtain 3,3′, dinitro-4,4′, diacetamidobiphenyl (DNDAcB) of formula 4, (b) hydrolyzing said 3,3′, dinitro-4,4′, diacetamidobiphenyl (DNDAcB) of formula 4 to obtain 3,3′, dinitro-4,4′, diaminobiphenyl (DNDAB) of formula 5, and (c) reducing said 3,3′, dinitro-4,4′, diaminobiphenyl (DNDAB) of formula 5 to obtain 3,3′,4-4′-tetraminobiphenyl (TAB) of formula 1.