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.
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Iranpoor et al. (1999) studied this question.
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