S. Balalaie et al., Zeolite HY and silica gel as new and efficient heterogenous catalysts for the synthesis of triarylimidazoles under microwave irradiation, MONATS CHEM, 131(9), 2000, pp. 945-948
Zeolite HY and silica gel efficiently catalyzed the three component condens
ation of benzil, benzaldehyde derivatives, and ammonium acetate under solve
nt-free conditions and microwave irradiation.