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Development of a simple, eco-benign and low cost protocol, using a heterogeneous and reusable catalyst in synthetic organic chemistry still remains as an attractive goal for researchers. Tannic acid is a specific commercial form of tannin, a type of polyphenol. The chemical formula for commercial tannic acid is given as C76H52O46, i.e., a molecule with deca-galloyl glucose. Glucose occupies the central core position in the tannic acid structure whose hydroxyl groups are attached to one or more galloyl residues. Polyphenolic nature of tannic acid may be explored for its weak acidity, catalytic efficiency, antioxidant activity, redox properties and hydrogen donor’s capability. Due to

ENVIRONMENT-FRIENDLY GREEN APPROACHES FOR AN EFFICIENT SYNTHESIS OF 2H-INDAZOLO [2,1-b] PHTHALAZINE-1,6,11 (13H)-TRIONES CATALYZED BY TANNIC ACID