科研之友
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摘要
Two Al-MIL-53 derived metal-organic frameworks (MOFs) were developed to serve as efficient heterogeneous Bronsted acid catalysts. Sulfonic acid functional groups were successfully incorporated into the framework by post-synthetic modification (PSM) using commercially available reagents. The synthesized Al-MIL-53-RSO3H and Al-MIL-53-ArSO3H Bronsted acid-MOF catalysts were fully characterized by SEM, powder XRD, FTIR, TGA and N-2 adsorption/desorption isotherms. An efficient [4 + 2] cycloaddition of 2-vinyl-substituted phenols was evaluated using the newly synthesized Al-MIL-53RSO(3)H and Al-MIL-53-ArSO3H catalysts. The Al-MIL-53-RSO3H and Al-MIL-53-ArSO3H catalysts were found to be compatible with a variety of substituted substrates; finally, they can be recycled five times without compromising the yield or selectivity of the reaction.
