A Magnetic Fe3O4/Modified Bentonite Composite as Recyclable Heterogeneous Catalyst for Synthesizing 2‐Substituted Benzimidazoles. Issue 13 (3rd April 2023)

• Record Type: Journal Article
• Authors: Wang, Shuang; Chen, Xiaodong; Bao, Lijian; Liu, Kejun; Bi, Yongchang; Xue, Yafei; Liu, Xiaowen; Gu, Qiang; Zhang, Yumin
• Is Part Of: ChemistrySelect. Volume 8:Issue 13(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-04-03
• Subjects: Benzimidazoles -- magnetic catalyst -- nano-sized -- preparation -- renewable resources; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202204930
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: An efficient and convenient synthesis of 2‐substituted benzimidazoles catalyzed by magnetic Fe3 O4 supported by modified bentonite (MB) was developed. Herein, a separable, magnetic catalyst Fe3 O4 /MB was successfully prepared on the basis of exploring Fe3 O4 synthesis by co‐precipitation method. Fe3 O4 was obtained in 96.09 % yield using sweet orange oil as a reducing and protecting agent. The result showed that the sweet orange oil played a crucial role in the preparation of Fe3 O4 . Fe3 O4 and Fe3 O4 /MB were characterized by powder XRD, SEM, EDX, XPS and BET, and were further applied to catalyze the synthesis of 2‐substituted benzimidazoles. The applicability of the substrate was investigated on the basis of optimizing the reaction conditions. As a consequence, 2‐substituted benzimidazoles were obtained in 37.01–91.68 % yield. It suggested that Fe3 O4 /MB was an environmentally friendly and low‐cost catalyst possessing good catalytic activity, broader substrate adaptability and excellent recyclability. It is a promising catalyst in industrial production. Abstract : A highly efficient, green and recyclable Fe3 O4 /MB catalyst was prepared using sweet orange oil as a reducing protection agent by one‐pot co‐precipitation method, and applied to catalyse the synthesis of 2‐substituted benzimidazoles. The method has good substrate applicability.