The Tungsten Catalytic Functional Compound:Synthesis And Application In Organic Oxidation Reaction

Olefin epoxidation reaction and alcohol oxidation reaction are the most common organic catalytic reactions which are used in the industrial production and in fine chemical industry. In these reactions, the selection of catalyst determines the rate, yield and selectivity of reaction. Then, it is a challenging task to design a catalyst which has high activity, high selectivity and recyclability in the field of catalytic oxidation. In recent years, polyoxometalates is widely applied in many fields, such as medicine chemistry, catalytic chemistry, materials chemistry, and has exhibited good catalytic activity and application prospect especially in the catalytic oxidation reaction.The contents of this paper are as follows:1. An ionic liquid peroxotungstate [(CH3)N(C8H17)3]2W2O11was synthesized and characterized by infrared spectroscopy,1H-NMR and so on. The results showed that they were pure. And then, the ionic liquid was used as catalyst to catalyze epoxidation of olefin. The single factor analysis method and the orthogonal experiment method are used to determine the best reaction conditions.2. Five new peroxotungstates ([Mor1,n]NaW2O11(n=2,4,5,8,10)) were synthesized and characterized by infrared spectroscopy,’H-NMR and so on. The results showed that they were pure. And then, the new tungstate was used as catalyst to catalyze epoxidation of olefin. The single factor analysis method and the orthogonal experiment method were used to determine the best reaction conditions.3. Four new peroxotungstates ([Quin]2W2O11(n=2,4,5,8)) were synthesized and characterized by infrared spectroscopy,1H-NMR and so on. The results showed that they were pure. And then, the new tungstate was used as catalyst to catalyze epoxidation of olefin. The single factor analysis method and the orthogonal experiment method were used to determine the best reaction conditions.4. Four new decatungstates ([Mor1,n]4W10O32(n=2,5,8,10) were synthesized and characterized by infrared spectroscopy, H-NMR and so on. The results showed that they were pure. And then, the new tungstate was used as catalyst to catalyze epoxidation of olefin. The single factor analysis method and the orthogonal experiment method to were used to determine the best reaction conditions.5. Four new decatungstates ([Quin]4Wio032(n=2,4,5,8) were synthesized and characterized by infrared spectroscopy,’H-NMR and so on. The results showed that they were pure. And then, the new tungstate was used as catalyst to catalyze epoxidation of olefin. The single factor analysis method and the orthogonal experiment method were used to determine the best reaction conditions.6. Experiment shows that the system has good catalytic effect on oxidation of alcohol with H2O2as oxidant and ionic liquid or decatungstates as catalyst. We used the single factor analysis method and the orthogonal experiment method to determine the best reaction conditions.7. Finally, the catalytic effects of the above-listed systems of epoxidation of olefin with different polyoxomet-alates as catalyst are compared.