Synthesis and characterization of nano-copper ferrite as a magnetically separable catalyst for the one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles under solvent-free condition
The authors report herein, synthesis and characterization of nano-copper ferrite as a recoverable, eco-friendly, inexpensive, and readily available catalyst for efficient, simple, and green synthesis of multi-substituted imidazoles. Short reaction times, high yields, easy workup, and mild condition are the advantages of this protocol. The catalyst can be reused without evident loss of the catalytic
An efficient and novel one-pot synthesis of 2,4,5-triaryl-1H-imidazoles catalyzed by UO2(NO3)2·6H2O under heterogeneous conditions
作者:Vardhineedi Satyanarayana、Amaravadi Sivakumar
DOI:10.2478/s11696-011-0028-z
日期:2011.1.1
An efficient, convenient, and novel one-pot method of 2,4,5-triaryl-1H-imidazoles synthesis using benzil, arene carbaldehydes, and ammonium acetate, catalyzed by uranylnitratehexahydrate [UO2(NO3)2·6H2O] supported on acidic alumina and resulting in good to excellent yields under heterogeneous conditions, is reported. Formation of a reactants-catalyst complex was confirmed by UV-VIS spectral data
as a recyclable and eco-benign catalyst, was used for one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles using aldehydes, benzil, benzoin or 9,10-phenanthrenequinone and ammonium acetate or aniline under solvent-free conditions providing high to excellent yields. VSA is easily prepared by a simple reaction of chlorosulfonic acid and sodium metavanadate in high
Perlite: A cheap natural support for immobilization of sulfonic acid as a heterogeneous solid acid catalyst for the heterocyclic multicomponent reaction
作者:Eskandar Kolvari、Nadia Koukabi、Maliheh M. Hosseini
DOI:10.1016/j.molcata.2014.10.026
日期:2015.2
Perlite sulfonicacid (Perlite-SO3H (PeSA)) has been synthesized by grafting the sulfonic groups on the perlite surface as naturally and cheap support to produce novel heterogeneous reusable solidacidcatalysts. FT-IR, XRD, SEM, TGA, pH analysis and Hammett acidity function were employed to characterize the properties of the synthesized PeSA. Significantly, the as-prepared PeSA exhibits a high catalytic
Perlite: an inexpensive natural support for heterogenization of HBF<sub>4</sub>
作者:Eskandar Kolvari、Nadiya Koukabi、Maliheh M. Hosseini、Zeinab Khandani
DOI:10.1039/c5ra03229f
日期:——
Nano-perlite-fluoroboric acid (n-PeFBA) has been synthesized by immobilization of HBF4 on perlite as a natural and cheap support to produce an efficient green heterogeneous reusable solid acid catalyst.