nitroniumione
Nitronium ion, or nitronium cation, with the formula NO2+, is a reactive electrophile central to many nitration reactions in organic chemistry. It is formed in strongly acidic media and acts to introduce a nitro group (−NO2) into aromatic rings and other substrates.
Structurally, the nitronium ion is typically described as a linear O=N=O+ unit, with the positive charge delocalized
Generation and sources: In typical nitration processes, nitronium ion is generated in situ by the reaction
Reactivity: The nitronium ion is the key electrophile in electrophilic aromatic substitution. It reacts with arenes
Safety and scope: NO2+ is a nonisolable species in most contexts and is produced under harsh, corrosive