| Visible light photocatalysis has gained significant recognition from the community of organic synthesis.Numerous transition-metal-centred complexes and organic molecules have been developed as visible-light photocatalysts for various reactions.Among these photocatalysts,transition-metal-centred complexes have drawn particular attention,because their redox potential and other photochemical properties can be tuned with the selection of ligands around the metal centre.This paper focuses on the development of a series of reactions catalyzed by copper complexes with visible light.Including the Chan-Lam coupling reaction of aniline with phenylboronic acid,the oxidation of aniline to azobenzene,the smooth conversion of styrene and its derivatives toα-chloroacetophenone,as follows:（1）Chan-Lam coupling of aniline and phenylboronic acid by copper chloride and hydrazone ligands under blue light irradiation.The diphenylamine structure has a wide range of applications in organic synthesis,drug molecules,molecular photoswitches.In this part,we have used hydrazone ligands with copper chloride under blue light irradiation,DBU as base and DMF as solvent to promote the Chan-Lam coupling of aniline with phenylboronic acid to obtain a series of diphenylamine compounds.The reaction was carried out at room temperature under mild conditions;oxygen in air was used as the oxidant,It is green and environmentally friendly;the products of various substituents of aniline and phenylboronic acid were obtained in good yields,and the reaction was well applicable.（2）Oxidation of aniline to azo-benzene by copper chloride and hydrazone ligand under blue light irradiation.In this part,we have developed the conversion of aniline to azobenzene at room temperature using copper chloride with hydrazone ligands in an oxygen atmosphere with blue light irradiation and potassium tert-butoxide as a base.The harsh reaction conditions were avoided,various types of substituted groups of aniline were converted to the corresponding azo benzene in good yields,providing a new idea for the synthesis of azo benzene.（3）Cu（Me CN）4PF6promotes the conversion of styrene toα-Chloroacetophenone.In this part,we developed a method to promote the conversion of styrene and its derivatives toα-chloroacetophenone under blue light irradiation,using trimethylchlorosilane as the chlorine source,Cu（Me CN）4PF6 as the catalyst and oxygen as the oxidant.Reaction conditions are mild and green,it has good compatibility of functional groups,leading to a series ofα-chloroacetophenone compounds in moderate to good yields. |
