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Published data on the preparation of biscoumarin derivatives is discussed in this review. Biscoumarins are synthesized via the reaction of 4‐hydroxy coumarin and different aldehydes. Many attempts have been made to apply various catalysts and also different reaction conditions to synthesize biscoumarins. The role of the catalyst and the reaction conditions on the reaction time and yield of the products is discussed.
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Mahmoodi et al. (2018) studied this question.
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