Mechanochemical Synthesis of Active Magnetite Nanoparticles Supported on Charcoal for Facile Synthesis of Alkynyl Selenides by C−H Activation

Abstract

Magnetite (Fe3O4) nanoparticles supported on charcoal, graphene, or SBA‐15 were prepared by a simple solid‐state grinding technique and subsequent thermal treatment. The Fe3O4 nanoparticles supported on activated charcoal exhibited high catalytic activity and furnished good yields of the alkynyl selenide product in the cross‐coupling reaction of diphenyl diselenide and alkynes through activation of C−H and Se−Se bonds under ecofriendly conditions, surpassing traditional copper‐based catalysts to effect the same organic transformation.

Supported Metal Nanoparticles Assisted Catalysis: A Broad Concept in Functionalization of Ubiquitous C−H Bonds

“…described a useful cross‐coupling reaction of diphenyl diselenide and alkynes through activation of C−H and Se−Se bonds employing the Fe 3 O 4 NPs supported on activated charcoal (Fe 3 O 4 @C) under eco‐friendly conditions (Scheme 42). [165] They fabricated three catalysts namely Fe 3 O 4 @C, Fe 3 O 4 @SBA‐15 and Fe 3 O 4 @graphene by a simple solid‐state grinding technique and followed by thermal treatment. It was observed that the Fe 3 O 4 @C catalyst exhibited high catalytic activity in terms of good yields of the coupling product.…”

σ-H–H, σ-C–H, and σ-Si–H Bond Activation Catalyzed by Metal Nanoparticles

“…Fe 3 O 4 NPs supported on charcoal, (0.5 mol % Fe 3 O 4 /C) were also studied by the same group in the cross coupling reactions between alkynes and diselenides to obtain alkynyl selenides. 229 Pd NPs have been used in halogenation reactions through C− H activation. In 2015, Korwar et al expanded the application of their catalytic system composed of Pd NPs supported on 233 Pd NPs with a mean size of around 2 nm were immobilized into two porous MOFs of different nature, [Pd@MIL-88B-NH 2 (Fe-MOF) and Pd@MIL-101-NH 2 (Cr-MOF)].…”

“…The role of the oxygen was to regenerate the disulfide or the diselenide. Fe3O4 NPs supported on charcoal, (0.5 mol% Fe3O4/C) were also studied by the same group in the cross coupling reactions between alkynes and diselenides to obtain alkynyl selenides 229. Pd NPs have been used in halogenation reactions through C-H activation.…”

Mechanically Activated Solvent-Free Assembly of Ultrasmall Bi2S3 Nanoparticles: A Novel, Simple, and Sustainable Means To Access Chalcogenide Nanoparticles

“…The importance of the latter materials for emerging technologies, for instance, those related to energy or medical diagnostics, calls for this development. Whereas solvent-free milling has previously been used to access diverse types of nanosized materials (including supported metal NPs; ,,− metal oxide, nitride, and sulfide NPs; − carbon-based NPs; − and porous nanocomposites) , such work has been largely based on top-down mechanochemical routes, i.e., through energy-demanding particle size reduction of bulk materials. Such comminution techniques can yield particles in the size range 10–50 nm, but they cannot provide the required level of size and shape control required for high end applications. , …”