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Nickel (II) chromite nanoparticles (NiCr 2 O 4  NPs) have been used as an efficient and reusable heterogeneous catalyst for the mild and green synthesis of [1]benzopyrano[ b ]pyridin-3-carbonitriles. The reaction was performed under solvent-free conditions at 70 °C. Several sustainable and economic benefits of the presented method are high yields of products, short reaction times, the use of new, highly efficient, heterogeneous and recyclable catalyst, clean conditions, and simplify practical aspects.

An Expedient Synthesis of [1]Benzopyrano[ b ]pyridin-3-carbonitriles Catalyzed by NiCr 2 O 4 NPs