【摘要】 以对苯二胺为主要原料,在无水氟化氢中,利用改进的席曼反应法制得对二氟苯。改进的方法可以不必分离出重氮盐,易于连续操作。反应条件如下:选择HF-三乙胺体系,n(亚硝酸钠):n(对苯二胺)=2.2,重氮化反应时间为3 h,收率为78%。更多还原

【Abstract】 Taking p- phenylenediamine as main material to synthesize 1,4- difluorobenzene by the Schiemann reaction. The reaction system was HF- triethylamine. n( Na NO2) ∶( p- phenylene-diamine) = 2. 2.Reaction time of the Schiemann reaction was 3 h. The recovery of the final product was 78%.更多还原