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.
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