Kaolin-SO3H as a new solid acid is prepared via reaction of kaolin and chlorosulfonic acid. This natural based catalyst is very inexpensive and easy available. A simple, highly versatile and efficient synthesis of 1,2,4,5-tetrasubstituted imidazoles is achieved using Kaolin-SO3H as a catalyst at moderate temperature under solvent-free condition. The key advantages of this process are high yields with simple work-up using easy available inexpensive natural based catalyst.
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Univ Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, ItalyUniv Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, Italy
Rossi, Renzo
Angelici, Gaetano
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Univ Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, ItalyUniv Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, Italy
Angelici, Gaetano
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Casotti, Gianluca
Manzini, Chiara
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Univ Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, ItalyUniv Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, Italy
Manzini, Chiara
Lessi, Marco
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Univ Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, ItalyUniv Pisa, Dipartimento Chim & Chim Ind, Via G Moruzzi 13, I-56124 Pisa, Italy
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Bu Ali Sina Univ, Fac Chem & Petr Sci, Dept Organ Chem, Hamadan 6517838683, IranBu Ali Sina Univ, Fac Chem & Petr Sci, Dept Organ Chem, Hamadan 6517838683, Iran