3 /ZrO 2, 3-포르 밀 크로몬, 포 밀 피라졸, 방향 족 알데하이드, 물, 불균 일 촉매 ABSTRACT. Knoevenagel condensation of 4-oxo-(4H)-1-benzopyran-3-carbaldehydes, 1,3-diphenyl-1H-pyrazol-4-carboxaldehyde and aromatic aldehyde has been carried out with 3-methyl-1-phenylpyrazolin-5-(4H)-one as condensing agent in moderate to good yields by using Borate Zirconia (B 2 O 3 /ZrO 2) solid acid catalyst in water medium. In each con-version, the catalyst was successfully recovered and recycled without significant loss in yield and selectivity.
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Shindalkar et al. (2005) studied this question.
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