Mesoporous Au/Fe2O3 catalyst for propargylamines synthesis via CH2Cl2 under visible light irradiation

The AHA coupling of amines, haloalkane and alkynes under UV visible light was achieved with a higher yield in the presence of Au/Fe2O3. The catalyst was prepared by two methods using different gold content and then characterized by XRD, UV-vis, BET, TEM, ICP-OES and TPR spectroscopies. A comparative study of the ordinary and photocatalytic conditions, showed that the UV visible light could activate the gold nanoparticles and lead to the formation of CH2Cl center dot and Cl-center dot radicals through CH2Cl2 fragmentation. The propargylamine was afforded at low temperature and a short time using 2% Au/Fe2O3. The catalyst was stable for five cycles with good photoactivity. [GRAPHICS] .

Automated summary

In this study, the AHA coupling reaction of amines, haloalkane and alkynes was achieved under UV visible light using Au/Fe2O3 as a catalyst. Comparative experiments under ordinary and photocatalytic conditions revealed that UV visible light could activate gold nanoparticles, leading to the formation of CH2Cl· and Cl· radicals. The propargylamine product was obtained at low temperature and short reaction time using 2% Au/Fe2O3, which showed good stability and photocatalytic activity.