Cu(AlCl4)2 reacts with benzene to give poly(1,4-phenylene). When 2.5 mmol of benzene was reacted with 2.5 mmol of Cu(AlCl4)2 at 20°C for 2 h, poly(1,4-phenylene) was obtained in 92 % yield, which is higher than that obtained with the conventional system, AlCl3–CuCl2 mixture, under the same conditions.
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Kitajima et al. (1982) studied this question.
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