Substitution reactions of phenylated aza-heterocycles. Part 1. Nitration of 2,5-diphenyl-1,3,4-oxadiazole: a product study using high performance liquid chromatography
作者:Alexander Blackhall、Donald L. Brydon、Anthony J. G. Sagar、David M. Smith
DOI:10.1039/p29800000773
日期:——
Contrary to a previous literature report, nitration of 2,5-diphenyl-1,3,4-oxadiazole (1) under various conditions gives a mixture of all six possible 2,5-bisnitrophenyl derivatives, which may be analysed quantitatively using high performance liquid chromatography. Nitration using nitric acid alone gives mainly the three isomers with p-nitrophenyl groups, i.e.(7), (9), and (10), whereas mixed acids
与以前的文献报道相反,在各种条件下硝化2,5-二苯基-1,3,4-恶二唑(1)可以得到所有六种可能的2,5-双硝基苯基衍生物的混合物,可以使用高效液相色谱法对其进行定量分析。液相色谱。单独使用硝酸进行硝化,主要得到具有对硝基苯基基团的三种异构体,即(7),(9)和(10),而混合酸和四氟硼酸硝鎓则主要得到间位硝化产物,即(6),(8) )和(9)。根据条件,三种2-(硝基苯基)-5-苯基-1,3,4-恶二唑的硝化[即(1)硝化的第二阶段]也显示出产物比率的相当大的变化。