Preparation and characterization of Mo supported amine functionalized poly-di-phenoxy-phosphazene for epoxidation of alkenes

Polyphosphazene is an inorganic polymer with wide range of applications. Its backbone comprised from phosphorous and nitrogen atoms with two side groups on phosphorus which controls its physical and chemical properties [1]. In this research polydichloro-phosphazene was prepared from reaction of ammonium sulfate and phosphorous pentachloride in dioxan at 160°C. The produced viscos liquid was then reacted with sodiumphenoxide in dioxane and refluxed for 24 hours to produce polydiphenoxyphosphazene. Then it was treated with concentrated nitric acid to induce nitro group on some phenyl rings. These nitro groups were then reduced to amine with sodium dithionite solution [2]. The produced amine functionalized polyphosphazen was then used to support bis-acetylacetonato-di-oxo molybdenumm complex and used in epoxidation of alkenes. CHN, ICP, XRD, SEM, EDX, FTIR and NMR spectroscopies were used to analyze the product of different steps. The reaction condition was optimized for cis-cyclooctene and then other alkenes were used at these optimum conditions. The optimum conditions were found as 20 mg catalyst in CCl4 for 0.5 mmolecyclooctene and 1 mmol TBHP as oxidant at reflux temperature. The yield at this reaction conditions was 98% after 3 hours. Recycling experiment was also investigated.