Process for the preparation of high quality 3,3amp;prime;,4,4amp;prime;-tetraminobiphenyl

摘要

The present invention relates to a process for the preparation of pure high quality 3,3′, 4,4′-tetraminobiphenyl (TAB) in high yields. The present invention also discloses a process for the preparation of 3,3′,4,4′ tetraminobiphenyl (TAB) comprising a three step process: (1) oxidation 3,3′-dichloro 4,4′-diaminobiphenyl (DCB) with 50% aq. H₂O₂, (2) ammonolysis of the resulting 3,3′-dinitro 4,4′-dinitrobiphenyl (DCDNB) and (3) reduction of 3,3′-diamino-4,4′-dinitrobiphenyl (DADNB) with stannous chloride and concentrated hydrochloric acid.