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A new core–shell magnetic silica functionalized with 3,4-diaminobenzoic acid nanocatalyst (Fe₃O₄@SiO₂@PTS-DABA) was prepared and characterized. The Fe₃O₄@SiO₂@PTS-DABA catalyst was applied for the synthesis of dihydropyranopyrazole and benzylpyrazolyl coumarin derivatives.
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Karami et al. (2020) studied this question.
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