Water → 1-(8-Bromooctyl)-2,4,5-triphenylimidazole

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2,4,5-Triphenylimidazole (5 g) was added to a suspension of sodium hydride (1.0 g) (50% dispersion in oil, washed with hexane) in dry dimethylformamide (80 ml) under nitrogen. The reaction was stirred at 45° C. for 1 h, cooled and added, over 1 h to a solution of 1,8-dibromo-octane (30 g) in dry dimethylformamide (100 ml) under nitrogen. The reaction was stirred at room temperature for 24 h, water was carefully added and the solvent was removed in vacuo. The residue was dissolved in ethyl acetate (500 ml), washed with water (250 ml), 2N aqueous hydrochloric acid (250 ml), saturated sodium chloride solution (250 ml), dried over anhydrous magnesium sulphate and evaporated to dryness in vacuo. Distillation to remove 1,8-dibromooctane and chromatography on silica gel eluted with dichloromethane gave 1-(8-bromooctyl)-2,4,5-triphenylimidazole (4.1 g, 50%) as an oil; NMR d (CDCl3) 0.9-1.7 (12H, m, 6×CH2), 3.3 (2H, t, BrCH2), 3.9 (2H, t, N--CH2), 7.1-7.7(15H, m, 3×Ph) ppm.

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