Abstract

15N CIDNP effects observed during nitration of phenolic compounds with nitric and nitrous acid are comparable showing that nitrous acid is not only a catalyst during nitration with nitric acid but also a reactive intermediate. The 15N CIDNP effects are generated in radical pairs formed during encounters of NO 2 and arene radical cations or aroxyl radicals. The mechanism given is valid for arenes more reactive than toluene.

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