Modified, Grafting, Catalytic Properties And Mechanism Of Ferrocenylimine Molybdenum (â…¥) Complexes In Olefin Epoxidation

Epoxide is an important organic intermediates, which is widely used in organic synthesis, fine chemical, pharmaceutical and spices industries. Olefins catalytic epoxidation reaction is an important method for the preparation of epoxide, and MoO2Cl2L-type dioxomolybdenum (VI) complexes used as catalysts for epoxidation reactions have been attracted extensive attention due to their high catalytic performance.In this paper, the dioxomolybdenum (VI) complexes used as novel catalysts for styrene epoxidation were studied in four aspects as follows:1. The influence of organic alkali used as additives for dioxomolybdenum (VI) complexes-catalyzed styrene epoxidation was researched. DFT method was used to suggest the intrinsic cause of the experimental phenomenon.2. UV-Vis spectra was used to investigate the temperature effect for the activation of catalysts, and offered an answer to the phenomenon why the selectivity is low in low temperature.3. Mesoporous molecular sieves MCM-41 was synthesized, and the complexes of MoO2Cl2L were heterogenised in it by direct grafting in dichloromethane(Scheme 1), respectively. These catalysts, which were characterized by N2 adorption, XRD, FT-IR, ICP and TG analysis, were also used as catalysts for styrene epoxidation. The experiment showed that these immobilized catalysts had better catalytic activity for styrene epoxidation after 5 runs without remarkably activity decrease.4:The interaction between MoO2Cl2L and TBHP was studied by FT-IR and UV-Vis spectra, and the method of DFT calculation was used to propose the mechanism of dioxomolybdenum (VI) complexes-catalyzed styrene epoxidation.