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2Mild preparation of 2-amino-3-cyano-4-aryl-4H-benzo[h]chromenes and 2-amino-3-cyano-1-aryl-1H-benzo[f]chromenes, under solvent-free conditions, catalyzed by recyclable basic ionic liquids, Research on Chemical Intermediates Efficient and eco-friendly synthesis of 2-amino-4H-chromene derivatives using catalytic amount of tetrabutylammonium chloride (TBAC) in water and solvent-free conditions, Journal of the Iranian Chemical Society