synthesis of bis(4-hydroxycoumarin)methanes using nano-cuo/ceo_2 as recyclable catalyst

coumarin derivatives have been widely utilized as agrochemicals, cosmetics, and pigments, demonstrating broad spectrum biological and pharmacological activities. in this research study, we reported an efficient and environmentally benign one-pot multi–component reaction for the synthesis of bis(4-hydroxylcoumarin) methanes derivatives from the reaction of 4-hydroxycoumarin and aromatic aldehydes in the presence of a catalytic amount of nano- cuo/ceo_2. the advantages of this method are including, good yields (92-97%), short reaction times, simple work-up and reusable catalyst. the catalyst could be recycled and reused for five times without much loss in its activity. as is evident from this research study, the best efficiency for the synthesis of bis(4-hydroxylcoumarin) methanes is achieved with the nano-cuo/ceo_2 catalyst in the shortest time.