Nano n-propylsulphonated γ -Fe 2 O 3 (NPS-γ -Fe 2 O 3 ) was applied as a new magnetically recyclable heterogeneous catalyst for the efficient one-pot synthesis of bis(pyrazolyl)methanes in water. The catalyst was easily isolated from the reaction mixture by a magnetic bar and reused at least five times without significant degradation in activity.
Title compounds (III) are prepared by one‐pot tandem Knoevenagel—Michael reaction of pyrazolone (I) with various aldehydes (II) in the presence of hydroxyethylammonium acetate as a task‐specific ionic liquid.
The employed catalyst can be easily isolated from the reaction mixture by a magnetic bar and reused at least five times without significant loss in its activity. -(SOBHANI*, S.; PAKDIN-PARIZI, Z.; NASSERI, R.; J. Chem. Sci. (Bangalore, India) 125 (2013) 5, 975-979, http://dx.
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