Oxonium ion
Encyclopedia : O : OX : OXO : Oxonium ion
The oxonium ion in chemistry is any positive oxygen cation, which has three bonds. The simplest oxonium ion is the hydronium ion H30+. Another oxonium ion frequently encountered in organic chemistry is obtained by protonation or alkylation of a carbonyl group e.g. R-C=O+-R' which forms a resonance structure with the fully fledged carbocation R-C+-O-R' and is therefore especially stable.
Other hydrocarbon oxonium ions are formed by protonation or alkylation of alcohols e.g. R-C-O+-R'R''.
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