[C:1]([N:4]1[CH:8]=[CH:7][N:6]=[CH:5]1)(=[O:3])[CH3:2].Cl[CH2:10][CH2:11][CH2:12][C:13]1[CH:23]=[CH:22][C:16]([C:17]([O:19][CH2:20][CH3:21])=[O:18])=[CH:15][CH:14]=1.[I-:24].[Na+]>C(#N)C>[I-:24].[C:1]([N+:4]1[CH:8]=[CH:7][N:6]([CH2:10][CH2:11][CH2:12][C:13]2[CH:23]=[CH:22][C:16]([C:17]([O:19][CH2:20][CH3:21])=[O:18])=[CH:15][CH:14]=2)[CH:5]=1)(=[O:3])[CH3:2]To 10 ml of dry acetonitrile were added 1.1 g of 1-acetylimidazole, 2.26 g of ethyl 4-(3-chloropropyl)benzoate and 1.5 g of sodium iodide, and the mixture was heated in a sealed tube for 18 hours at 140° C. under stirring. After cooling, the reaction mixture was filtrated to remove insoluble materials and the filtrate was concentrated under reduced pressure. To the residue was added an adequate amount of dry diethyl ether and the resulting powder was collected by filtration to obtain 3.99 g of 1-acetyl-3-[3-(4-ethoxycarbonylphenyl)propyl]imidazolium iodide. (pale yellow hygroscopic amorphous).
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