Effects Of Heterogeneous Visible-light Photocatalytic Reaction Based On Supported Iridium Complex Catayst

In recent years,visible light catalytic redox reaction has become one of the hot research directions in organic synthesis because it is greener than traditional organic synthesis.However,it is limited by the expensive transition metal iridium and ruthenium catalysts.Heterogeneous catalysts have been paid more attentions by researchers due to their environmental friendliness,simple operation,multiple recycling and no degradation of catalytic performance.In this paper,a novel heterogeneous catalyst,Ir?ppy?₂?PDVB-py?,was designed by loading the transition metal iridium complex on vinyl pyridine and divinylbenzene nano porous copolymers in the form of chemical bond.Through the characterization of SEM and BET,it was found that the catalyst had a good crosslinking structure and a high specific surface area,which made the catalyst stable before and after the reaction and easy to recycle.The catalyst was used to synthesize tetrahydroisoquinoline derivatives by cycle chemical reaction of visible light mediated tertiary aniline and maleimide,and good separation yield was obtained.The catalytic efficiency has no obviously change after four times recycling.Next,the heterogeneous visible light catalyst was used in Vilsmeier-Haack reagent mediated synthesis conversion reaction to synthesize amides,nitriles and anhydride derivatives.This catalyst showed extremely high catalytic activity in all these reactions,with the average separation yield up to 70%.The catalyst maintained good catalytic efficiency after five cycles.In summury,the supported iridium complex catalyst has better stability and catalytic activity than the conventional transition metal catalyst.It could be easy to recycle and reuse,and has wide application prospects.