A Schiff base complex of lanthanum on modified MCM-41 as a reusable nanocatalyst in the homoselective synthesis of 5-substituted 1H-tetrazoles. Issue 53 (29th November 2022)

• Record Type: Journal Article
• Authors: Tahmasbi, Bahman; Nikoorazm, Mohsen; Moradi, Parisa; Abbasi Tyula, Yunes
• Is Part Of: RSC advances. Volume 12:Issue 53(2022)
• Page Start: 34303
• Page End: 34317
• Publication Date: 2022-11-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra05413b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this work, mesoporous MCM-41 was modified by a new Schiff-base formed from the condensation of triethylenetatramine and 5-bromosalicylaldehyde. Then, lanthanum was immobilized on its surface as reusable nanocatalyst in the synthesis of tetrazoles. Abstract : In this work, mesoporous MCM-41 was modified by a new Schiff-base formed from the condensation of triethylenetatramine and 5-bromosalicylaldehyde. Then, it was used for the stabilization of lanthanum metal (La-Schiff base@MCM-41) as a homoselective, reusable, efficient and biocompatible catalyst in the synthesis of 5-substituted 1 H -tetrazole derivatives. The synthesized tetrazoles were characterized using 1 H NMR and FT-IR spectroscopy and methods to measure their physical properties. La-Schiff base@MCM-41 was characterized by using various techniques such as ICP, CHN, XRD, TGA, BET, FT-IR spectroscopy, SEM, EDS and WDX. This catalyst has good stability and a heterogeneous nature, enabling it to be easily recovered and reused several times without significant loss in catalytic activity. This present strategy has important advantages such as utilizing PEG as a green solvent, short reaction times, excellent yields, easy recycling of the catalyst and pure separation of the products. The recovered La-Schiff base@MCM-41 catalyst was characterized by using FT-IR spectroscopy, SEM and AAS.