Abstract

N-(3-Silicapropyl)-N-methyl imidazolium hydrogen sulfate ([Sipmim]HSO₄) is prepared and employed as a recyclable catalyst for the synthesis of 4,4’-(arylmethylene)bis(1H-pyrazol-5-ols) from aromatic aldehydes with 3-methyl-l-phenyl-5-pyrazolone in refluxing ethanol. [Sipmim]HSO₄ could be recycled for several times without any additional treatment.

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