A well behaved electrophilic aromatic substitution with very high substrate and positional selectivity is observed in benzene and toluene nitration with NO2BF4–crown ether complexes in CH2Cl2.
B. Masci, J. Chem. Soc., Chem. Commun., 1982, 1262 DOI: 10.1039/C39820001262
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