Redox flow battery is a type of rechargeable flow battery that employs in different oxidation states to store chemical potential energy. To improve the energy density, we prepared metal complex including bipyridine ligand. Also, phthalimide and 4oxo-tempo derivatives was prepared for organic electrolyte. In this paper, we will present the efficient preparation of various bipyridine, phthalimide, 4-oxo tempo derivatives.

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