The water-dispersible and magnetic separable Au/Fe3O4/s-G nanocomposite was used as an effective and reusable heterogeneous catalyst for the Ullmann homocoupling.
ARTICLE
This journal isThe ultra-small Au nanoparticles (Au NPs) immobilized HS-functionalized sandwich-like periodic mesoporous silica (PMS) coated graphene (G) to form a novel nanocomposite catalyst Au NPs@HS-G-PMS. The synthesized Au NPs@HS-G-PMS nanocatalyst exhibited excellent catalytic activity on the three kinds of organic reactions. The reduction of 4-nitrophenol by sodium borohydride, the Suzuki-Miyaura cross coupling reaction of aryl halides with phenyl boronic acid and three coupling reaction of aldehyde, alkyne, and secondary amine (A 3 -coupling) in water were successfully done. Most importantly, the catalyst could be used repetitively more than six times without significant deactivation.
In the present study, a novel and magnetically separable Pd−catalyst system was designed using the immobilization of PdII on Phendioxime(PDO)‐functionalized magnetic partially reduced (GO‐OMWCNT) composite (MPR (GO‐OMWCNT)/PDO/PdII). In the as‐obtained nanocomposites, the incorporation of 1D OMWCNTs and 2D graphene oxide can form a versatile 3D network with high specific surface area and synergic properties. Moreover, non‐ covalent phendioxime functionalization provides highly effective functional groups on the surface of MPR (GO‐OMWCNT) for PdII. Non‐covalent interaction carries out through π‐π stacking and hydrogen bond interactions .The catalytic activity of this nanocomposite was examined in the Suzuki–Miyaura cross‐coupling reaction. MPR (GO‐OMWCNT)/PDO/PdII composite exhibited good catalytic efficiency and obtained the products in good to excellent yield under mild aerobic conditions. Moreover, the suggested catalyst could be easily recovered magnetically and used for at least six runs without a noticeable decrease in its catalytic activity.
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