Magnetically Separable Copper Ferrite Nanoparticles‐Catalyzed Synthesis of Diaryl, Alkyl/Aryl Sulfones from Arylsulfinic Acid Salts and Organohalides/Boronic Acids

Abstract

A recyclable, inexpensive, non-toxic and environmentally benign catalytic system comprised of magnetically separable copper ferrite (CuFe 2 O 4 ) nanoparticles has been developed for the synthesis of diaryl, alkyl/aryl sulfones. Arylsulfinic acid salts are coupled with various alkyl/aryl halides/boronic acids to afford the corresponding diaryl, alkyl/aryl sulfones in good to excellent yields under the identical catalytic system. A wide range of functional group tolerance, with facile recovery of the catalyst by application of an external magnetic field, and consistently high catalytic efficiency for five consecutive cycles render the protocol operationally attractive.

Evaluating spinel ferrites MFe2O4 (M = Cu, Mg, Zn) as photoanodes for solar water oxidation: prospects and limitations

“…The binding energy of Cu 2p1/2 and Cu 2p3/2 at 951.0 eV and 933.2 eV together with the typical satellite peaks at 959.2 eV and 941.3 eV match with previous studies on CFO. 47,48 Although the satellite signals confirm the existence of Cu 2+ , the presence of traces of metallic copper or Cu + cannot be completely discarded since their Cu 2p1/2 and Cu 2p3/2 features would overlap with those of Cu 2+ . 49 However, previous analysis by XRD does not suggest the presence of metallic copper or Cu2O.…”

Iron Catalysis in Organic Synthesis

“…623 Using 1,10-phenanthroline as ligand and DMF as solvent at 110°C afforded the corresponding sulfones in high yields. Analogously, arylsulfinic acids could also be coupled with aryl boronic acids under the same conditions (see section 2.5.2).…”

“…623 The reaction was performed in DMF at 110°C in the presence of 1,10-phenanthroline as ligand. Diaryl and alkenyl aryl sulfones could be obtained in good yields.…”

New approach towards the polyol route to fabricate MFe2O4 magnetic nanoparticles: The use of MCl2 and Fe(acac)3 as chemical precursors

“…At the nanoscale, ferrite spinel structure presents a superparamagnetic behavior at room temperature (and not ferrimagnetic as bulk structure does) meaning that its maximum magnetization occurs under a low intensity external magnetic field without becoming a permanent magnet. Since this group of magnetic nanoparticles is being used in different application fields (medicine [1][2][3], electronics [4], chemistry [5][6][7], etc. ), the interest to tune their properties as wanted has been increasing in the last years.…”