1,8-Bis(diphenylphosphino)anthracene (1) was prepared in a three-step synthesis in 51% overall yield starting from 1,8-dichloro-9,10-anthraquinone (8). Compound 8 was converted by chlorine-fluorine exchange and reduction with zinc into 1,8-difluoroanthracene (7) from which 1 was obtained by reaction with potassium 1,8-bis(dimethylamino)anthracene (10) clearly showed that in the case of 7 direct nucleophilic displacement (addition-elimination mechanism) dominates over aryne formation (elimination-addition mechanism). Single crystal X-ray structure analyses are reported for 1 and 10.
以 1,8-二
氯-9,10-
蒽醌 (8) 为原料,通过三步合成制备了 1,8-双(
二苯基膦)
蒽 (1),总产率为 51%。化合物8通过
氯-
氟交换并用
锌还原转化为1,8-二
氟蒽(7),其中1通过与1,8-双(
二甲氨基)
蒽钾(10)反
应得到,清楚地表明在7 直接亲核置换(加成-消除机制)主导芳炔形成(消除-加成机制)。报道了 1 和 10 的单晶 X 射线结构分析。