Iranian Journal of Catalysis (IJC) Nanomagnetite-Fe3O4 as a highly efficient, green and recyclable catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s Volume 5 (2015) Issue 4, December 2015 2024 02 03 Nanomagnetite-Fe3O4 as a highly efficient, green and recyclable catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s EN Abdolkarim Zare Department of Chemistry, Payame Noor University, PO Box 19395-3697, Tehran, Iran 0000-0002-8210-3155 Fereshteh Abi Department of Chemistry, Payame Noor University, PO BOX 19395-4697, Tehran, Iran Vahid Khakyzadeh Faculty of Chemistry, Bu-Ali Sina University, Hamedan, 6517838683, Iran Ahmad Reza Moosavi-Zare Department of Chemistry, Sayyed Jamaleddin Asadabadi University, Asadabad, 6541861841, Iran. Alireza Hasaninejad Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran Mahmoud Zarei Department of Chemistry, Faculty of Science, University of Qom, Qom, 3716146611, Iran 0000-0002-3701-9755 Journal Article 2024 02 03 Nanomagnetite-Fe3O4 is used as a highly efficient, mild, green and recyclable nanomagnetite catalyst for the synthesis of 4,4´-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives in solvent-free conditions. The condensation reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with aromatic aldehydes affords the title compounds in high yields and short reaction times. The nanocatalyst is reusable for seven times without significant loss of its catalytic activity. Short reaction times, high yields, generality, efficiency, recyclability of the catalyst for seven times, simple purification, clean reaction, and agreement with the green chemistry protocols are some advantages of in this method. the catalyst was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM).