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A new and efficient method for the synthesis of dicoumarol (3,3'-methylene-bis-4-hydroxycoumarin) in the presence of catalytic amounts of silica-supported Preyssler nanoparticles (SPN) is reported. The catalyst performs very well in comparison with other heteropolyacids catalysts. An important advantage of this catalyst is the ease of separating it from the reaction mixture, as well as the fact that it could be recycled a number of times.
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Gharib et al. (2015) studied this question.
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