Novel core-shell nanocomposite as an effective heterogeneous catalyst for the synthesis of benzimidazoles
Jianwei Zheng1, Liying Zhang1, Yang Li1
1College of Science, Northeastern University, Shengyang 110819, People's Republic of China.
Abstract:
Core-shell nanocomposites with a catalytic metal-organic framework (MOF) shell are more effective and stable than bare MOF. We have successfully designed an effective heterogeneous catalyst for the synthesis of benzimidazole by integrating acidic catalytic activity, and promoted the aerobic oxidation and magnetic recyclability of core-shell nanocomposite Fe3O4@SiO2@UiO-66. The Fe3O4@SiO2core is encapsulated by thein situ-grown UiO-66 shell, and the UiO-66 shell retains the porous structure and crystallinity of UiO-66 with abundant exposed Lewis acid sites. It shows high catalytic ability for the synthesis of various benzimidazoles through the acid-catalyzed condensation and aerobic oxidation within situoxygen. The Fe3O4@SiO2core provides magnetic recyclability of Fe3O4@SiO2@UiO-66, and maintains high catalytic ability and stability over six cycles.
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