carbocation


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carbocation

[¦kär·bō′kat‚ī·ən]
(organic chemistry)
A positively charged ion whose charge resides, at least in part, on a carbon atom or group of carbon atoms.
References in periodicals archive ?
The highly reactive carbocation -- an intermediate in many organic and biological processes - has helped researchers probe the mechanisms behind chemical reactions.
This also validates that methanol produced by hydrolysis or heterocondensalion, which is characterized by a similar resonance, cannot be trapped within the hybrid and has only two fates: it can either transfer to a propagation carbocation or diffuse out of the film.
This result indicates that the reactivity of the carbocationic species generated during the polymerization process, which includes the initiating carbocations and chain propagating carbocations, were reactive enough to polymerize the vinylether groups of the VESFA, but not so reactive that they add to double bonds of the fatty acid portion of VESFA.
These chemical reactions would involve the formation of transient carbocation intermediates.
Most recently, Schrobilgen and his research group at McMaster have developed an oxidative route to carbocations using noble-gas species as oxidants.
A key aspect of this synthesis was the TMSOTf-mediated epoxide opening that proceeds trough a carbocation mechanism leading to the possibility of methyl migration and hydride shift side reactions.
This, and our detection of rearranged products (equation 2) suggest that the mechanism could involve either 1) elimination followed by addition of water and then another elimination, 2) elimination followed by protonation to form a different carbocation which then eliminates, or 3) a mechanism that is more "E2-lik e" for the stereoisomer which readily exists in an anti-periplanar conformation while the other stereoisomer reacts by a more "E1-like" mechanism.
Protonation at the carbonyl oxygen of AA by acid catalyst: carbocation production;
Experimental and theoretical evaluation of energetics for nucleophilic solvent participation in the solvolysis of tertiary alkyl chlorides on the basis of gas phase bridgehead carbocation stabilities.