Carbonium (ion)

Carbonium (ion)

Un ion carbonium est un carbocation dont l'atome de carbone portant la charge électrique est tétra- ou pentacoordonné, de type R5C+[1].

De tels cations organiques se forment par exemple sous l'action de superacides tels que l'acide fluoroantimonique HSbF6 ou « l'acide magique » HSFO3·SbF5.

Un ion carbonium classique est le méthanium CH5+, qu'on trouve dans le milieu interstellaire.

Références

  1. ↑ George Andrew Olah, « Stable carbocations. CXVIII. General concept and structure of carbocations based on differentiation of trivalent (classical) carbenium ions from three-center bound penta- of tetracoordinated (nonclassical) carbonium ions. Role of carbocations in electrophilic reactions », dans J. Am. Chem. Soc., vol. 94, no 3, 1972, p. 808–820 [lien DOI] 

Articles connexes


Wikimedia Foundation. 2010.

Contenu soumis à la licence CC-BY-SA. Source : Article Carbonium (ion) de Wikipédia en français (auteurs)

Игры ⚽ Нужна курсовая?

Regardez d'autres dictionnaires:

  • carbonium ion — /kahr boh nee euhm/ an organic ion containing a positively charged carbon atom (opposed to carbanion). [CARBON + IUM] * * * ▪ chemical ion Introduction       any member of a class of organic molecules with positive charges localized at a carbon… …   Universalium

  • Carbonium ion — CH5 redirects here. For the postal district, see CH postcode area. A carbonium ion is a carbocation of the penta or tetracoordinated nonclassical type such as an ion of the type R5C+.[1] Methanium CH5+ …   Wikipedia

  • Carbonium-Ion — Car|bo|ni|um Ion [↑ Carbon u. ↑ ium (2)]: von der IUPAC nicht empfohlene, aber dennoch viel benutzte Bez. für die ↑ Carbokationen mit fünfbindigem C Atom, z. B. CH+5 (Methanium Ion, allg.: Alkanium Ion), H7C+6 (Benzenium Ion) oder das Norbornyl… …   Universal-Lexikon

  • carbonium ion — car·bo·ni·um ion kär bō nē əm n an organic ion that contains a positively charged carbon atom …   Medical dictionary

  • carbonium ion — noun a carbenium ion or any carbocation …   Wiktionary

  • carbonium ion — [kα: bəʊnɪəm] noun Chemistry an organic ion with a positive charge located on a carbon atom. Origin early 20th cent.: from carbo , on the pattern of ammonium …   English new terms dictionary

  • carbonium ion — /kaˈboʊniəm ˌaɪən/ (say kah bohneeuhm .uyuhn) noun a positively charged organic ion such as H3C+ or R2C+=O, having one less electron than the corresponding free radical; a reactive intermediate in many organic reactions …  

  • carbonium ion — /kahr boh nee euhm/ an organic ion containing a positively charged carbon atom (opposed to carbanion). [CARBON + IUM] …   Useful english dictionary

  • carbonium — [kär bō′nē əm] n. 〚 CARB(O) + (AMM)ONIUM〛 a transient, positively charged organic ion, as H3C+, R3+, that has one less electron than the corresponding free radical * * * car·bo·ni·um (kär bōʹnē əm) n. An organic cation, such as H3C, having one… …   Universalium

  • carbonium — [kär bō′nē əm] n. [ CARB(O) + (AMM)ONIUM] a transient, positively charged organic ion, as H3C+, R3+, that has one less electron than the corresponding free radical …   English World dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”