Synthesis and characterization of magnetic dichromate hybrid nanomaterials with triphenylphosphine surface modified iron oxide nanoparticles (Fe3O4@SiO2@PPh3@Cr2O72−)

Straightforward and Recyclable System for Synthesis of Biaryl Ketones via Carbonylative Coupling Reactions of Aryl Halides with PhB(OH)2 and (EtO)3 PhSi

“…The process for the preparation of ImmPd(0)‐MNPs catalyst is schematically described in Scheme . Briefly, CS‐methionine was first attached to chitosan by the reaction between methyl methioninate and chitosan in DMF and then was treated with Fe 3 O 4 nanoparticles prepared by mixing of FeCl 3 .6H 2 O and FeSO 4 according to the reported procedure . Finally, immobilization of Pd(0) on the surface of magnetic support results in acting as a robust anchor and avoiding Pd leaching.…”

Methionine‐functionalized chitosan–Pd(0) complex: A novel magnetically separable catalyst for Heck reaction of aryl iodides and aryl bromides at room temperature in water as only solvent

“…First, CS–methionine was prepared by the reaction between methyl methioninate and chitosan in dimethylformamide (DMF). In the second step, CS–methionine was treated with Fe 3 O 4 nanoparticles prepared by mixing of FeCl 3 ⋅6H 2 O and FeSO 4 according to a reported procedure, to obtain Fe 3 O 4 –CS–methionine as a magnetic substrate. Finally, palladium acetate was grafted into this magnetic support in ethanol to afford ImmPd(0)‐MNPs as the final catalyst.…”

“…Fe 3 O 4 nanoparticles were prepared without using any plugging agent or surfactant via conventional co‐precipitation of iron(II) sulfate and iron(III) chloride according to a reported procedure . After sonication, Fe 3 O 4 nanoparticles (2.1 g) were treated with CS–methionine (0.7 g) in 2 wt% acetic acid solution.…”

Magnetite tethered mesoionic carbene‐palladium (II): An efficient and reusable nanomagnetic catalyst for Suzuki‐Miyaura and Mizoroki‐Heck cross‐coupling reactions in aqueous medium

“…To conquer these difficulties, nowadays, magnetic nanoparticles have been used as a catalyst support, which include the advantage of very high surface area and easy recovery and recycling of catalyst. In this way, magnetic separation offers a convenient and efficient method for the recovery of the nanomagnetic catalyst from C–C cross‐coupling reaction systems …”

“…In this way, magnetic separation offers a convenient and efficient method for the recovery of the nanomagnetic catalyst from C-C cross-coupling reaction systems. [37] Extensive literature survey reveals that no reports are available on the synthesis and characterization of 1,3,4trisubstituted 1,2,3-triazol-5-ylidene metal complexes on the surface of magnetic nanoparticles with high catalytic activity in Suzuki-Miyaura and Mizoroki-Heck crosscoupling reactions. Thus in continuation of our investigations on magnetically recyclable nanomagnetic catalysts in various organic transformations, we report here a new magnetic nanoparticle supported 1,3,4-trisubstituted 1,2,3-triazol-5-ylidene-palladium (II) nanomagnetic catalyst whose ligand system is based on mesoionic carbenes which is entirely different from NHCs and Schiff-base ligand system which were reported in our earlier work.…”