Ionic Complex of N2O4with 18-Crown-6: A Highly Efficient and Selective Reagent for Nitration of Phenols

Abstract
Interaction of gaseous N2O4 with 18-crown-6 affords the stable crystalline complex of NO+·18-crown-6·H(NO3)2. This ionic complex is an efficient nitrating agent for the selective mono-, di-, and trinitration of phenol and also for the selective mono-, and dinitration of substituted phenols.