Immobilized antimony species on magnetite: a novel and highly efficient magnetically reusable nanocatalyst for direct and gram-scale reductive-coupling of nitroarenes to azoarenes

Abstract

In this study, magnetic nanoparticles of Fe3O4@SbFx were synthesized. Then, the catalytic activity of Fe3O4@SbFx MNPs was highlighted by one-pot reductive-coupling of aromatic nitro compounds to the corresponding azoarene materials with NaBH4.

Synthesis of 3‐Arylazoindoles through Iron(III)‐Catalyzed C−H Azolation of Indoles and Arylhydrazines

“…Traditional widely used strategies for the preparation of azo compounds are oxidative dimerization of aromatic amines, [4] reductive dimerization of nitrobenzenes, [5] Mills reactions between aromatic nitroso derivatives and anilines, [6] diazonium coupling reactions, [7] and oxidative dehydrogenation of arylhydrazines, [8] or other related transformations. [9] Many of these strategies were also used to prepare 3arylazoindoles.…”