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A green, simple and efficient synthesis of bis-coumarin derivatives via the condensation of 4-hydroxycoumarin with arylaldehydes using sulfonic-acid-functionalized pyridinium chloride {[Pyridine–SO 3 H]Cl} as a new, homogeneous and reusable catalyst and ionic liquid is reported.
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Zolfigol et al. (2014) studied this question.
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