Melamine trisulfunic acid is employed as a recyclable catalyst for the condensation reaction of aromatic aldehydes with 3-methyl-l-phenyl-2-pyrazolin-5-one. This condensation reaction was performed in ethanol under refluxing conditions giving 4,4¢-(arylmethylene)-bis-(3-methyl-1-phenyl-1H-pyrazol-5-ols) in 80-96% yields.
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