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 ?
It is well known that induction of DMN-dI activity could lead to the production of more reactive carbonium ions that alkylate DNA and other macromolecules [23, 24].
Increasing temperature could improve both of the diffusion velocity of carbonium ions (+C[H.sub.2]OH) into initial fibers and the reaction rate of carbonium ions (+C[H.sub.2]OH)/ surface fibers crosslinking reaction.
Low energy pathways for carbonium ion formation and novel methods for generating alkali ion complexes with .pi.- and n-donor bases.
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.
(1) Cleavage of organic matrix via free-radical mechanism that favors the evolution of straight-chain aliphatics and [C.sub.2] hydrocarbons, and (2) cracking of hydrocarbon products via a carbonium ion mechanism that favors the formation of isoparaffins, internal olefins, and [C.sub.3] gases [2].
Butler and Hussain (1981) suggested a mechanism for the generation of this intermediate and its subsequent oxidation to form a coloured carbonium ion [XII], which has since been cited in reviews on the determination of urea (Taylor and Vadgama 1992; Francis et al.
David Wulfman is a graduate of the University of Michigan and holds a PhD from Stanford University where he did work on steroid total syntheses and NMR studies of carbonium ion processes.
Schleyer, Carbonium Ions, 2, 837-97, Wiley, New York (1970).
This rule allows carbonium ions of different structure to be distinguished between those that could create tumors in organisms and those that cannot (ref.
DMC-produced transient intense red colour carbonium ion complex when dissolved in [H.sub.2]S[O.sub.4] (concentrated).