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A nitrenium ion (also called: aminylium ion) in organic chemistry is a reactive intermediate based on nitrogen with both an electron lone pair and a positive charge and with two substituents (R2N+).〔Reactive Intermediate Chemistry, Moss, Platz, & Jones (eds.), Wiley(2004).〕 〔Gold Book definition (link )〕 Nitrenium ions are isoelectronic with carbenes, and can exist in either a singlet or a triplet state. The parent nitrenium ion, NH2+, is a ground state triplet species with a gap of 30 kcal/mol to the lowest energy singlet state. Conversely, most arylnitrenium ions are ground state singlets. Certain substituted arylnitrenium ions can be ground state triplets, however. Currently, nitrenium ions see heavy study in the groups of Matt Platz (Ohio State), Michael Novak (Miami), and Daniel Falvey (University of Maryland). Aryl nitrenium ions are currently investigated because of their involvement in certain DNA damaging processes. These intermediates can have microsecond or longer lifetimes in water.〔''Reaction of Aromatic Azides with Strong Acids: Formation of Fused Nitrogen Heterocycles and Arylamines'' Marcia de Carvalho, Ana E.P.M. Sorrilha, and J. Augusto R. Rodrigues J. Braz. Chem. Soc., Vol. 10, No. 5, 415-420, 1999. (link )〕 They can also be exploited for useful synthetic processes. Nitrenium ions are also intermediates in organic reactions; for instance, the Bamberger rearrangement. They can also act as electrophiles in electrophilic aromatic substitution.〔''Microwave-assisted generation of carbazolyl nitrenium cation'' Dariusz Bogdal ARKIVOC 2001 (vi) 109-115 (Link )〕 The term imidonium ion with the same meaning, is now obsolete. ==See also== * The related neutral nitrenes R-N 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nitrenium ion」の詳細全文を読む スポンサード リンク
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