Methenium

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In chimia organic, methenium (de methyl-enium (en)), methyl cation o methylium es un cation de formula CH+3.

Pote esser vidite como:

un methyleno radical (:CH₂) con un additional proton (H⁺);
un methyl radical (•CH₃) con un electron removite. Es un carbocation (en) e un enium (en) ion. Illo le face le plus simple del carbenium iones.^[1]

Detection

Cf. Moleculas interstellar e circumstellar (en)

In junio 2023, methyl cation es detegite pro le prime vice in le spatio interstellar per astrophysicos.^[2]

Articulo principal: Abiogenese

Es cognoscite pro su reaction de recombination dissociative in interstellar medio^[3] o in le ionosphera de alcun planetas:

CH⁺3 + e⁻ → :CH₂ + H^·

↑ Golob, L. (1972). "The first ionization potential of the methyl radical as determined by photoelectron spectroscopy". Journal of Electron Spectroscopy and Related Phenomena 1 (5): 506–508. Elsevier BV. doi:10.1016/0368-2048(72)80022-7. ISSN 0368-2048.
↑ Berne, Olivier et al. (26 June 2023). "Formation of the Methyl Cation by Photochemistry in a Protoplanetary Disk". Nature. doi:10.1038/s41586-023-06307. Recuperate le 27 June 2023.
↑ Le cation méthyle (CH3+) détecté pour la première fois dans l’espace (francese). Observatoire de Paris (27 juin 2023).