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A carbenium ion is a positive ion with the structure RR′R″C+, that is, a chemical species with carbon atom having three covalent bonds, and it bears a...

studied. The carbonium ion has a planar geometry. In older literature, the name "carbonium ion" was used for what is today called carbenium. The current definitions...

to the ease of measuring the disappearance of the carbenium ion absorbance. Common carbenium ions are trityl and tropylium cations. Ionizing radiation...

carbon: three in the carbenium ions and five in the carbonium ions. This nomenclature was proposed by G. A. Olah. Carbonium ions, as originally defined...

the C2 position of two indole moieties to form a resonance stabilised carbenium ion compound. Ehrlich reagent can be used to detect urobilinogen, which...

oxygen atoms. An oxocarbenium ion is represented by two limiting resonance structures, one in the form of a carbenium ion with the positive charge on carbon...

cyclization reactions and because it is possible to capture the oxo-carbenium ion with a large array of nucleophiles. The halo-Prins reaction is one such...

differentiation of trivalent (classical) carbenium ions from three-center bound penta- or tetracoordinated (nonclassical) carbonium ions. Role of carbocations in electrophilic...

carbocation and an enium ion, making it the simplest of the carbenium ions. Experiments and calculations generally agree that the methenium ion is planar, with...

from ammonia (NH3). Fluxional methanium can be visualised as a CH+3 carbenium ion with a molecule of hydrogen interacting with the empty orbital in a...

the decay technique for preparing and studying organic radicals and carbenium ions. In a variant of that technique, exotic species like methanium are produced...

reaction, since the carbon atom is converted into an sp2 hybridized carbenium ion during the transition state for the rate-determining step with an increase...

A polyatomic ion (also known as a molecular ion) is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave...

do not contain the cation. Triphenylcarbenium is a relatively stable carbenium ion, because the positive charge is partially distributed among 10 of the...

having alternating single and multiple bonds. Lone pairs, radicals or carbenium ions may be part of the system, which may be cyclic, acyclic, linear or mixed...

electrophilic addition of either a carbenium ion or covalent species to the nitrile. The resulting nitrilium ion is hydrolyzed to the desired amide....

diazonium or carbenium ions, respectively. The decomposition occurs into isocyanic acid and methyldiazohydroxide. The rearrangement to the diazonium ion and the...

appear when the Br− is large excess in the reaction medium. A β-bromo carbenium ion intermediate may be predominant instead of 3 if the alkene has a cation-stabilizing...

differences between corresponding bromide derivatives (sp3) and the carbenium ion as sp2- model for the transition state. (Figure 2) In principle, angle...

The Bamford–Stevens reaction gives carbenes in aprotic solvents and carbenium ions in protic ones. The different mechanisms imply that singlet carbene...