A novel ordered mesoporous carbon nitride (OMCN) was synthesized as a functionalized support with 2,4,6‐trichloro‐1,3,5‐triazine and benzidine as starting materials in the presence of SBA‐15 as a template. Copper nanoparticles were then loaded on the C–N material to achieve a novel nanocomposite catalyst (Cu NPs‐OMCN). The nanocomposite was utilized as a highly efficient catalyst for homo‐ and cross‐coupling of terminal alkynes under base‐free conditions in ethanol, and various symmetrical and unsymmetrical 1,3‐diynes were obtained with good to excellent yields. Moreover, based on this reaction, a one‐pot approach to synthesize 2,5‐disubstituted thiophenes and furans from terminal alkynes were developed. Furthermore, the heterogeneous catalyst could be recovered and reused conveniently for several times with satisfactory yields.
In this paper, Au/TiO2 nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions. A sheet‐like anatase titanium dioxide material with a highly active (001) crystal plane was prepared via a solvothermal method. Gold nanoparticles were then loaded on the surface of TiO2 by a liquid‐phase reduction method to give an Au/TiO2 material with good photocatalytic activity. The Au/TiO2 nanocomposite was utilized as a photocatalyst to develop a light‐promoted Minisci oxidative coupling reaction of ether and aza aromatics by using oxygen as green oxidant and only catalytic amount of acid as additive. The protocol shows a good functional group tolerance as well as good to excellent yields for various substrates. With mechanistic studies, Au/TiO2 nanocomposite proved to be an efficient photocatalyst to activate C−H bond via a SEO approach of heteroatoms. Moreover, the solid semiconductor photocatalyst shows good recycling performance, could be easily recovered and reused without significant decrease in yield.
The selective functionalisation of arylamine derivatives with hexafluoroisopropanol through copper(II)‐catalysed aerobic oxidative coupling was developed to generate various fluoroalkylated arylamines under mild conditions. This method has a wide substrate scope with excellent functional group tolerance and provides the fluorinated products in good to excellent yields. Furthermore, preliminary studies indicate that this reaction occur via a radical mechanism. This protocol, which uses atmospheric O2 as an oxidant, provides an alternative green route for constructing fluorinated compounds.
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