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An ion that has a positively charged carbon atom.

References in periodicals archive ?
Woodworth, Substituents and Bridgehead Carbonium Ion Reactivities.
Using low heating rate, the accessibility of initial fibers for carbonium ions (+C[H.
The 10 most common medications prescribed to the 47 participants who completed the study were: Calcarea fluoric, Rhus toxicodendron, Pulsatilla, Natrum muriaticum, Bryonia alba, Thuja occidentalis, Lycopodium clavatum, Kali carbonium, Arnica montana, Sepia officinalis.
The resulting sulfo conjugate is supposed to be very unstable and can decompose to a reactive DNA-binding carbonium ion.
The rodent bioassay data indicate that methyl eugenol, along with some structural analogs and when administered at high-bolus doses, may cause a shift in metabolism, resulting in the formation of a reactive carbonium ion intermediate.
At acidic centres on catalyst surface, C4 alkenes are easy to form carbonium ions, through which reactions can take place, and consequently, the conversion is high.