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2,5-氯硝基苯与环丁砜和4A 分子筛混合搅拌24h后过滤,滤液中加人18-冠醚-6和 KF,于180℃反应32 h,得2-氟-5-氯硝基苯(2);2经催化氢化(80%)、形成氟硼酸
2,5-chloronitrobenzene was mixed with sulfolane and 4A molecular sieves and stirred for 24 hours, then filtered. The filtrate was added with 18-crown-6 and KF and reacted at 180 ° C for 32 h to give 2-fluoro-5-chloronitrobenzene (2); 2 Hydrofluoric acid is formed by catalytic hydrogenation (80%)