Catalytic synthesis of cyclic carbonates from epoxides and carbon dioxide by magnetic UiO‐66 under mild conditions

Abstract

The catalytic activity of UiO‐66@Fe3O4@SiO2 catalyst was investigated in the fixation of carbon dioxide with epoxides under mild conditions. In this manner, a facile magnetization of UiO‐66 was achieved simultaneously by simply mixing this metal–organic framework and silica‐coated Fe3O4 nanoparticles in solution under sonication. The prepared catalyst was characterized using Fourier transform infrared and UV–visible spectroscopies, X‐ray diffraction, transmission and field emission scanning electron microscopies, N2 adsorption and inductively coupled plasma atomic emission spectroscopy. This new heterogeneous catalyst was applied as a highly efficient catalyst in the coupling of carbon dioxide with epoxides at mild temperatures and pressures. Furthermore, it could be easily recovered with the assistance of an external magnetic field and reused three consecutive times without significant loss of activity and mass.

Highly efficient oxidative cleavage of alkenes and cyanosilylation of aldehydes catalysed by magnetically recoverable MIL‐101

“…The FE‐SEM images in Figure show that MIL‐101 retains its nature and is not altered during modification and magnetization. Also, Fe 3 O 4 @SiO 2 MNPs were found to be homogeneously assembled onto the external surface of MIL‐101 crystals …”

Zirconium Metal‐Organic Framework (UiO‐66) as a Robust Catalyst toward Solvent‐Free Synthesis of Remarkable Heterocyclic Rings

“…One of the most stable MOFs is UiO‐66, a Zr‐containing metal organic framework [Zr 6 O 4 (OH) 4 (O 2 C‐C 6 H 4 ‐CO 2 ) 6 ] with high thermal, mechanical and chemical stability . Very recently different types of this family of MOF such as UiO‐66, UiO‐66‐SO 3 H, UiO‐66‐NH 2 , Ce doped UiO‐66 and magnetic UiO‐66 have been used as both Bronsted and Lewis acid catalysts or as a support for organic transformations. Although the catalytic application of Zr‐MOFs in organic reactions has been reported, their catalytic role in some chemical transformations especially multicomponent reactions (MCRs) is less investigated.…”

Efficient Selective Catalytic Fixation of CO2 into Epoxide to Form Cyclic Carbonates Using Sodium Aluminate Engineered Gamma Alumina Catalyst

“…From these results, it was found that the TBAI alone does not have the ability to enhance the reaction rate in getting an excellent yield of the desired product. 42 Also, the tested catalysts namely, NaAlO 2 and γ-Al 2 O 3 failed to attain the desired styrene carbonate product with more than 80% yield in the presence of TBAI. So, the combination of γ-Al 2 O 3 and NaAlO 2 catalyst achieved 94% conversion of SO and 93% selectivity, along with an 87% yield of the styrene carbonate product (Table 1, entry 5).…”