The functionalization of silica-coated, magnetic Fe3O4 nanoparticles, with an ironcontaining ionic liquid, allows for the synthesis of a Fe3O4@SiO2@(mim) [FeCl4] system that can be employed as a magnetically recoverable nanocatalyst. Herein, we present the use of Fe3O4@SiO2@(mim) [FeCl4] for the glycolysis of PET into BHET under conventional heating. The catalyst achieved nearly 100% yield and selectivity over twelve consecutive reaction cycles at 180 °C and was efficiently recovered without tedious work-up or purification processes. Additional analyses revealed that the amount of catalyst lost after each cycle was negligible and no trace of Fe was found in the purified BHET product.
The synthesis and characterization of two new organic/inorganic hybrid polyoxometalate ionic liquids (POM-ILs) is described. The POM-ILs were formed by pairing bulky trihexyl(tetradecyl)phosphonium cations [THTP] + with organosiloxane and organophosphonate-functionalized Keggin-type POMs [PW 11 O 39 (SiPh) 2 O] 3and [PW 11 O 39 {P(O)Ph} 2 ] 3-. The func-[a] GSK 456 Scheme 1. Synthetic scheme for the synthesis of compound 2. Blue spheres/polyhedra=W; magenta=P; red=O; grey=C; white=H. Cations are included only as text for clarity.
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