2-Bromo-1-(4-hydroxyphenyl)ethanone → Bromide ion

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A mixture of 2-amino-1-(2-morpholinoethyl)benzimidazole (10 mmol, 2.46 g) and 4-hydroxyphenacyl bromide (10 mmol, 2.15 g) (obtained by bromination of parahydroxyacetophenone with cuptic bromide in a mixture of chloroform and ethyl acetate) is heated at reflux for 1 hour in 10 ml of dimethylformamide. After cooling, the mixture is poured into 50 ml of water and rendered alkaline with ammonium hydroxide. The resulting oil is removed and treated with water. The crystallised residue is filtered, dried, and recrystallised from ethanol.

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