| As we all know,catalyst,as an essential substance in the field of chemistry,plays an important role in both modern organic synthesis chemistry and chemical industry.Among them,organometallic catalysts are the most widely used at present,but due to the use of expensive precious metals,their development and application in industry are largely limited.Therefore,people have been committed to research and develop a relatively economic,green and efficient catalyst.Due to its special structure,certain acidity and suitable redox property,polyoxometalates are widely used in various fields.Compared with other polyacids,Anderson polyacids with symmetrical structure have not been reported in the field of catalysis.Based on the previous work and achievements,the POM catalysts of chromium and cobalt have been synthesized and applied to organic catalytic oxidation.Some research work has been done,including the following contents.The main work includes the following:(1)Under the condition of carbon dioxide,the Cr-Anderson type polyoxometalates were used as catalysts to study their different roles in the oxidation of alcohols to carboxylic acids.The results show that the system has good substrate tolerance,and the product can be obtained in a certain yield under mild conditions.(2)The Co-Anderson polyoxometalates were used in the oxidative esterification of aldehydes.After we conducted the experiment of the selection of experimental conditions,the optimal conditions were determined,and we found that the esters with high yield could be prepared by adding chloride ions into the catalytic system. |
