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Reusable Transition Metal Complex Catalyst For Preparing 3,3-Diaminobenzidine

Invention provides a reusable transition metal complex catalyst. Transition metal complex catalyst is useful for the preparation of high pure quality 3,3-diaminobenzidine and its analogues. Tetraaminobiphenyl prepared using transition metal catalyst is a valuable intermediate for example used as a monomer in the preparation of polybenzimidazole polymers.

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