α-Fe<sub>2</sub>O<sub>3</sub> immobilized benzimidazolium tribromide as novel magnetically retrievable catalyst for one-pot synthesis of highly functionalized piperidines

doi:10.1016/j.cclet.2016.07.005

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Abstract Nanostructured α-Fe₂O₃ were prepared by precipitation followed by calcination method.Cetyltrimethylammonium bromide (CTAB) was used as surfactant.The nano α-Fe₂O₃ was then silanized with (3-chloropropyl)-triethoxysilane (CPTES) by room temperature mixing of α-Fe₂O₃ and CPTES to produce silane coated α-Fe₂O₃(ClPr-Si@Fe₂O₃).As-synthesized ClPr-Si@Fe₂O₃ was functionalized via covalent grafting of benzimidazole to produce 3-(1-benzimidazole) Pr-Si@Fe₂O₃.This was further reacted with bromine to afford α-Fe₂O₃ immobilized benzimidazolium tribromide (α-Fe₂O₃-BIM tribromide).This ionic liquid (IL) α-Fe₂O₃ BIM tribromide was characterized by FT-IR,XRD,TEM,SEM,TGA,VSM,EDX and BET analysis.The as-synthesized IL tribromide was used as catalyst for one-pot synthesis of highly substituted piperidines.The method is greener in terms of solvent selection,recovery of the catalyst and efficiency.

Key words： Nano α-Fe₂O₃ Covalent grafting Ionic liquid Multicomponent reaction

Received: 11 May 2016

Corresponding Authors: Bappi Paul, Siddhartha Sankar Dhar E-mail: bappipaulnits@gmail.com;ssd_iitg@hotmail.com

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http://www.chinchemlett.com.cn/EN/10.1016/j.cclet.2016.07.005 OR http://www.chinchemlett.com.cn/EN/Y2016/V27/I11/1725

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