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在－１２～－１５℃的低温下，将对苯二胺浓盐酸的悬浮液慢慢滴加到新鲜制备的亚硝酸的氟硼酸溶液中，可获得８５％收率的对苯二胺双氟硼酸重氮盐，将此重氮盐进行热分解可得对二氟苯，收率６４％。
At a low temperature of -12 ~ -15 ℃, the para-phenylenediamine concentrated hydrochloric acid suspension was slowly added dropwise to a freshly prepared solution of nitrous acid borofluoride to obtain 85% yield of p-phenylenediamine difluoride Boric acid diazonium salt, the diazonium salt was thermally decomposed p-difluorobenzene yield of 64%.