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Abstract
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3-Aminopropylated silica gel is introduced as an ef?cient, reusable, and thermally
stable heterogeneous catalyst for tandem Knoevenagel–Michael reaction of 1-phenyl-3methyl-5-pyrazolone
with aldehydes. Short reaction times, mild reaction conditions, ease
of recovery, and catalyst reusability make this method a new, economical, and waste-free
chemical process for the ef?cient synthesis of bis(pyrazolyl)methanes.
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