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© The Author(s) 2013. Published by Science and Education Publishing. Table 1. No Aldehydes Yield% R.T(min) M.p. M.Wt. M. Formula 1a C6H5- 98 20 271-272 296.37 C21 H16 N2 b 2-OHC6H4- 95 15 204-205 312.36 C21 H16 N2O c 4-OHC6H4- 96 267-269 d 4-CH3OC6H5- 230-232 326.39 C22 H18 N2O e 4-(CH3)2NC6H4- 94 30 256-258 339.43 C23 H21 N3 f 3,5-CH3OC6H5- 222-224 356.42 C23 H20 N2O2 g 4-NO2C6H5- 241-242 341.36 C21H15 N3O2 h 2-NO2C6H5- 230-231 i 4-CHOC6H5- 92 221-223 324.38 C22H16N2O j 2,4-CH3OC6H5- 35 217-219 k 2,6-ClC6H5- 228-231 365.26 C21 H14 Cl2N2 l 4-HOOCC6H5- 320-323 340.37 C22H16N2O2 m 4-ClC6H5- 262-264 330.81 C22 H15Cl N2 n 2,5-CH3OC6H5 93 27 181-183 o 3-CH3OC6H5 266-268 p 4-BrC6H5- 86 23 249-252 375.26 C22 H15 Br N2 Synthesis of 2, 4, 5-trisubstituted imidazoles via a one-pot three component reaction in the presence of diethyl ammonium hydrogen phosphate as Brønsted acidic ionic liquid under thermal solvent-free condition at 100°C. Adel A. Marzouk et al. Synthesis of 2,4,5-Triphenyl Imidazole Derivatives Using Diethyl Ammonium Hydrogen Phosphate as Green, Fast and Reusable Catalyst. World Journal of Organic Chemistry, 2013, Vol. 1, No. 1, 6-10. doi:10.12691/wjoc-1-1-2 © The Author(s) 2013. Published by Science and Education Publishing.