Polyphosphoric acid supported on silica-coated NiFe2O4 nanoparticles: An efficient and magnetically-recoverable catalyst for N-formylation of amines

Cesium carbonate supported on hydroxyapatite coated Ni0.5Zn0.5Fe2O4 magnetic nanoparticles as an efficient and green catalyst for the synthesis of pyrano[2,3-c]pyrazoles

“…In continuation of our previous works on the applications of reusable catalystsinorganic reactions [19][20][21], here we report the new efficient and green synthesis of pyranopyrazoles usingNi 0.5 Zn 0.5 Fe 2 O 4 @ Hap-Cs 2 CO 3 as a basic catalyst (Scheme 1). To the best of our knowledge, this is the first report on the synthesis, characterization and catalytic performance ofaNi 0.…”

Piperazine‐functionalized nickel ferrite nanoparticles as efficient and reusable catalysts for the solvent‐free synthesis of 2‐amino‐4H‐chromenes

“…1 HNMR and 13 CNMR spectra were obtained with Bruker 300 MHz and 400 MHz in DMSO-d 6 and tetramethylsilan (TMS) as a standard. X-ray diffraction of the sample was recorded via a GE Inspection Technologies/Seifert-FPM, X-ray diffraction (XRD) diffractometer (Cu-Kα, λ = 0.154 nm).…”

“…These properties are due to the cationic arrangement, their size, and scale of particles [2] and make them one of the best choices for drug transfer, tissue imaging, [3] biological targets, magnetic resonance imaging (MRI) instruments, permanent magnets, and sensors. [6] Also, these compounds were applied as magnetic fluids, gas sensors, photomagnetic materials, and heterogeneous catalysts in chemical synthesis. [6] Also, these compounds were applied as magnetic fluids, gas sensors, photomagnetic materials, and heterogeneous catalysts in chemical synthesis.…”

Silica coated magnetic NiFe2O4 nanoparticle supported phosphomolybdic acid; synthesis, preparation and its application as a heterogeneous and recyclable catalyst for the one-pot synthesis of tri- and tetra-substituted imidazoles under solvent free conditions

“…The silica coated NiFe 2 O 4 MNPs (NFS, Scheme 1) were synthesized according to our previous reports [46][47][48] and then, for the immobilization of PMA on NFS, 0.5 g of PMA was dissolved in 5 mL of methanol. 49 This solution was added dropwise to a suspension of 1.0 g NFS in methanol (50 mL) and then the mixture was heated at 70 C for 48 h under vacuum while being mechanically stirred and gave the supported nanomagnetic catalyst (NFS-PMA).…”