Dimethylformamide → 3-Chloro-N-(3-chloropropyl)-4-methylaniline

A mixture of 3-chloro-4-methylaniline (7.79 g, 55 mmol), 1-chloro-3-iodopropane (5.91 ml, 55 mmol), cesium carbonate (35.84 g, 110 mmol) and DMF (15 ml) was stirred at room temperature for 19 hours. To the mixture was added water (75 ml), and the mixture was extracted with hexane (60 ml, 30 ml×2). The organic layer was washed with water (10 ml), dried over magnesium sulfate and concentrated under reduced pressure. The concentrate was subjected to column chromatography (silica gel 200 g, hexane/ethyl acetate=1/0 to 19/1), and the desired fraction was concentrated under reduced pressure to give the titled compound (7.30 g, 33 mmol, Yield 61%) as a pale brown oily substance.