The Synthesis Of Organic Boron Sensitizers And Its Application Research In The Reaction Of The Carbon Mixed Bonding Of Photocatalytic Carbon

With the increasing awareness of environmental protection,people are more and more interested in green organic chemistry.Therefore,in the development of recent decades,photocatalytic reactions have become an important branch in organic chemistry,mainly because the photochemical reactions induced by visible light are more environmentally friendly,less waste,and in line with the concept of sustainable development.For photocatalytic reactions,the most important thing is photocatalysts,so for improvement,the creation of new photocatalysts has become a more popular direction.Because carbon heterobonds play a very important role in the organic skeleton,organic chemists have been paying more attention to the study of carbon heterobonds.The composition of traditional carbon heterobonds requires precious metal catalysis or high temperature environment,which is very unfriendly for environmental protection,and with the development of photocatalysis,organic chemists have gradually turned their attention to this.The use of photocatalysis to construct carbon heterobonds is not only green,but also solves the problem of difficult reaction of some substrates.The main research part of this thesis is divided into the following three parts:（1）The first chapter mainly studies the synthesis of tetracoordinated organoboronic complexes and their application under visible photocatalysis.A series of tetracoordinated N,O organic boron photosensitizers were synthesized in a gentle way by the reaction of isoquinoline-3-carboxylic acid and potassium phenyltrifluoroborate salt.And all products have achieved good yields.At the same time,the tetracoordinated organoboronic photosensitizer was used for photocatalytic reaction.The tetracoordinated organoboronic acid photosensitizer synthesized by the model reaction was used as a photocatalyst for phenylboronic acid oxidation and triphenylphosphorus oxidation,and it was found that the target product could be obtained with moderate yield.（2）The second chapter is to use the tetracoordinated organic boron allergens to perform the coupling reaction of the carbon nitrogen bond under the photocatalytic litter.We use the raw material for cyanocomium bromybenzine and folding nitrogen-based trisnexane.Under the catalysis of light and nickel dual-catalysis,and use 4,4’-di-tert-butyl-2,2’-bipyridine as the ligand,N,N-Diisopropylethylamine as base.The lower reaction was 24 hours,and the productivity of the target product was finally obtained at a revenue of 83%.The reaction system is not only suitable for aryl halides such as ortho,meta and para-position,but also for heterocyclic aromatic hydrocarbons,such as quinoline,pyridine and other aryl halides,which can achieve good yields.（3）Chapter 3 is the coupling reaction of carbon-sulfur bonds under photocatalysis using tetracoordinated organoboro-boron photosensitizers.This reaction utilizes the reaction of p-cyanobromobenzene with sodium benzenesulfinate.With 1 mol%tetracoordinated organoboronic compound as photocatalyst,Ni Br₂·3H₂O as nickel source,4,4’-di-tert-butyl-2,2’-bipyridine as ligand,DMSO（dimethyl sulfoxide）as solvent,the reaction was carried out under white light for 24 hours,and finally the target product was obtained with a yield of85%.The functional groups of the reaction are well compatible,for example cyanogroups,esters,aldehydes and ketones also obtain good yields.