Ethenium
In chemistry, ethenium, protonated ethylene or ethyl cation is a positive ion with the formula C2H+5. It can be viewed as a molecule of ethylene (C2H4) with one added proton (H+), or a molecule of eth
Tropylium tetrafluoroborate
Tropylium tetrafluoroborate is an organic compound with the formula C7H7BF4. Containing the tropylium cation and the non-coordinating tetrafluoroborate counteranion, tropylium tetrafluoroborate is a r
Tropylium cation
In organic chemistry, the tropylium ion or cycloheptatrienyl cation is an aromatic species with a formula of [C7H7]+. Its name derives from the molecule tropine from which cycloheptatriene (tropyliden
Triphenylcarbenium
In chemistry, triphenylcarbenium, triphenylmethyl cation, tritylium , or trityl cation is an ion with formula [C19H15]+ or (C6H5)3C+, consisting of a carbon atom with a positive charge connected to th
Carbonium ion
In chemistry, a carbonium ion is any cation that has a pentavalent carbon atom. The name carbonium may also be used for the simplest member of the class, properly called methanium (CH+5), where the fi
Carbocation
A carbocation is an ion with a positively charged carbon atom. Among the simplest examples are the methenium CH+3, methanium CH+5 and vinyl C2H+3 cations. Occasionally, carbocations that bear more tha
Oxocarbenium
An oxocarbenium ion (or oxacarbenium ion) is a chemical species characterized by a central sp2-hybridized carbon, an oxygen substituent, and an overall positive charge that is delocalized between the
2-Norbornyl cation
In organic chemistry, the term 2-norbornyl cation (or 2-bicyclo[2.2.1]heptyl cation) describes one of the three carbocations formed from derivatives of norbornane. Though 1-norbornyl and 7-norbornyl c
Methenium
In organic chemistry, methenium (also called methylium, carbenium, methyl cation, or protonated methylene) is a cation with the formula CH+3. It can be viewed as a methylene radical (:CH2) with an add
Nonclassical ion
Nonclassical carbocations are stabilized by charge delocalization from contributions of neighbouring C−C or C−H bonds, which can form bridged intermediates or transition states. Nonclassical ions have
Carbenium ion
A carbenium ion is a positive ion with the structure RR′R″C+, that is, a chemical species with a trivalent carbon that bears a +1 formal charge. In older literature the name carbonium ion was used for
Methanium
In chemistry, methanium is a complex positive ion with formula [CH3(H2)]+, namely a molecule with one carbon atom bonded to three hydrogen atoms and one hydrogen molecule, bearing a +1 electric charge
Vinyl cation
The vinyl cation is a carbocation with the positive charge on an alkene carbon. Its empirical formula is C2H+3. More generally, a vinylic cation is any disubstituted, trivalent carbon, where the carbo
Ethanium
In chemistry, ethanium or protonated ethane is a highly reactive positive ion with formula C2H+7. It can be described as a molecule of ethane (C2H6) with one extra proton (hydrogen nucleus), that give
Triphenylmethyl hexafluorophosphate
Triphenylmethyl (also triphenylcarbenium, trityl, or tritylium) hexafluorophosphate is an organic salt with the formula C19H15F6P or (C6H5)3CPF6, consisting of the triphenylmethyl cation [(C6H5)3C]+ a
Arenium ion
An arenium ion in organic chemistry is a cyclohexadienyl cation that appears as a reactive intermediate in electrophilic aromatic substitution.For historic reasons this complex is also called a Whelan
Armilenium
Armilenium is a C11H+11 carbocation and was originally proposed as the first entirely organic sandwich compound. Named for its resemblance to an armillary sphere, NMR evidence for the carbocation was