Abstract
An efficient monochlorination of electron-rich aromatic compounds is developed, with which a series of regioselective monochlorinated products are obtained in good yields. In the reaction, ammonium iodide is used as catalyst and m-chloroperbenzoic acid is used as the terminal oxidant. Ammonium iodide is first oxidised to hypoiodous acid by m-chloroperbenzoic acid. The in situ generated active iodine species then reacts with the aromatic compound to form the active hypervalent iodine intermediate in two steps and this reacts with lithium chloride to afford eventually the chlorinated compounds.
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