Synthesis Of The New Molybdenum (VI) Catalysts, Studies On Epoxidation Of Styrene And Polymerization Of Polyether

Epoxides are one of the most important organic intermediates. The preparation of epoxides by reaction between alkyl peroxides and olefins catalyzed by high-valent transition metal complexes is one of the most important means of preparation of epoxides. Glycidol oligomers structurally belong to line polylol polyether, and can directly act as thickener, moisturizing and so on. The polymerization of allyl alcohol by new molybdenum(VI) is one of the most important means of preparation.New Molybdenum complex MoO₂X₂L₂ (X, L = F, OPMePh₂ (1) ; Cl, OPMePh₂ (2); Cl, OPPh₃ (3)) have been prepared according to the previous relevant literature and characterized by IR and ¹HNMR; It first reported that the epoxidation of styrene catalyzed by MoO₂Cl₂(OPMePh₂)₂ has been investigated by using an oxidant source,tert-butylhydroperoxide (TBHP); This reaction system is mild but very efficient. After the reaction is completed, the samples are analyzed by GC-MS. In order to investigate the reaction results, we define the Styrene Conversion and Product Selectivity. The results show that the influences of solvent, reaction time, and molar ratio of styrene to catalyst or TBHP on the reaction is very important. CCI4 is the best solvent in this system; with the improvement of reaction temperature and elongation of reaction time, product selectivity reduces. When the reaction is conducted at 70°C, the molar ratio of catalyst/styrene/TBHP at 5/100/150, and CC14 as solvent, the highest conversion of styrene and product selectivity is obtained at 60.07% and 46.35%, respectively.We have demonstrated that studies on polymerization of allyl acohol catalyzed by MoC^C^OPMePl^ directly by using an oxidant source, tert-butylhydroperoxide (TBHP), glycidol is achieved. This reaction system's condition is mild and controllable. After the reaction is completed, the samples are analyzed by IRn 1HNMR and LC-MS. The influences of molar ratio of allyl acohol to catalyst, reaction temperature, reaction time, and solvent, peroxide on the reaction were also studied. The results show that toluene is better solvent for this polymerization. When the reaction is conducted at 80 °C and polymerization time is 4h,the molar ratio of catalyst/allyl acohol/TBHP at 1/200/200, and...