Preparation Of Acidic And Alkaline Graphite Intercalation Compounds And Research Of Catalyzing Synthesis Of Chalcone

Chalcones is a kind of organic compounds with high research value. The classicpreparation method of chalcone synthesis is Claisen-Schmidt condensation reactions ofbenzaldehyde and acetophenone in the presence of strong acidic or alkaline catalyst. In recentyears, chemists developed a lot of catalysts to synthesize chalcones, and the synthesis methodof chalcone is also more and more diversified.Graphite intercalation compounds is a new multifunctional carbon material. Accordingto the acidity and alkalinity of graphite intercalation compounds, it can be divided into acidicgraphite intercalation compounds and alkaline graphite intercalation compounds. In recentyears, acidic graphite intercalation compounds has begun to be used in catalytic fields.However, in the technology of preparing the graphite intercalation compounds,the large dosage of the oxidant lead to much oxide retaining in the graphite intercalationcompounds. If we catalyze the synthesis of chalcone by using graphite intercalationcompounds, it is easy to cause the oxidation of benzaldehyde and the low-yield of chalcone.Moreover, the acidity of the graphite intercalation compounds prepared by using the chemicaloxidation method is too weak to catalyze the synthesis of chalcone. In this case, if we canprepare acidic graphite intercalation compounds which meet the needs, and use them tocatalyze synthesis of chalcone, it will undoubtedly have important application value.Moreover, alkaline graphite intercalation compounds being used in catalytic fields has notbeen reported in the literature. Therefore, we considered that it would be a new method tosynthesize chalcone by using acidic graphite intercalation compounds or alkaline graphiteintercalation compounds as catalysts, and this method also had great application value.The main work of this thesis：1．We prepared the acidic graphite intercalation compounds by using flake graphite asraw material, potassium dichromate, concentrated sulfuric acid and peroxyacetic acid asreactants, and we also investigated the influences of mass ratio of the reactants on the acidityand the expanding volume of the acidic graphite intercalation compounds. On this basis, weconfirmed the mass ratio of the reactants being used to prepare catalysts. Meanwhile, we also characterized the structure of the acidic graphite intercalation compounds and the intercalationcompounds in the acidic graphite intercalation compounds by using methods of XRD, SEMand so on. In addition, we prepared the alkaline graphite intercalation compounds by usingflake graphite as raw material, homemade composite oxidant PSH, sodium hydroxide andhydrogen peroxide as reactants, and we also investigated the influences of mass ratio of thereactants on the alkalinity of the alkaline graphite intercalation compounds. On this basis, weconfirmed the mass ratio of the reactants being used to prepare catalysts. At the same time, wealso characterized the structure of the alkaline graphite intercalation compounds by usingmethod of SEM.2．We synthesized chalcone by using acidic graphite intercalation compounds andalkaline graphite intercalation compounds as catalysts respectively, and we investigated theinfluences of catalyst dosage, molar ratio, reaction temperature and time on the yield of thechalcone. On this basis, we confirmed the optimum reaction conditions. Meanwhile, under theoptimum reaction conditions, we investigated the influences of catalyzing time used of thecatalyst on the yield of the chalcone.3．Based on the facts that the acidic graphite intercalation compounds can release thehydrogen proton and catalyze the reaction between benzaldehyde and acetophenone tosynthesize chalcone, we proposed the reaction mechanism that the acidic graphiteintercalation compounds was used as a catalyst. Meanwhile, based on the facts that thealkaline graphite intercalation compounds can release the hydroxyl and catalyze the reactionbetween benzaldehyde and acetophenone to synthesize chalcone, we proposed the reactionmechanism that the alkaline graphite intercalation compounds was used as a catalyst.