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Trioctylmethylphosphonium nitrate (P8,8,8,1NO3), an ionic liquid made via a green synthesis,\udcatalyses electrophilic aromatic chlorination of arenes with HCl and air at 80 °C. The aromatic\udoxychlorination is truly catalytic in nitrate, proceeds without added solvents, and uses atmospheric\udoxygen as oxidant. The extent of chlorination can be controlled to yield selectively mono or 10\uddichlorinated products, and the ionic liquid catalyst can be recycled. Dependence of the rate on\udHCl and nitrate concentrations as well as on the rate of re-oxidation of the nitrogen intermediates\udby air, allowed to propose a chlorination mechanism

Phosphonium nitrate ionic liquid catalysed electrophilic aromatic oxychlorination