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Reference.org
Carbenium ion
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<p>The carbenium ion is a kind of <a href="/facts/Cation/wrbwhF3z">positive ion</a> with the structure RR′R″C+, that is, a <a href="/facts/Chemical_species/A8BxM3oW">chemical species</a> with carbon atom having three covalent bonds, and it bears a +1 <a href="/facts/Formal_charge/uqHf9WD7">formal charge</a>. Carbenium ions are a major subset of <a href="/facts/Carbocation/vIggUxTh">carbocations</a>, which is a general term for diamagnetic carbon-based cations. In parallel with carbenium ions is another subset of carbocations, the <a href="/facts/Carbonium_ion/VYlBArVA">carbonium ions</a> with the formula R5+. In carbenium ions charge is localized. They are isoelectronic with mono<a href="/facts/Borane/pHQMPw5r">boranes</a> such as B(CH3)3. </p>