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Superacid-Promoted Ionization of Alkanes Without Carbonium Ion Formation: A Density Functional Theory Study
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Syntetisk organisk kemi.
2012 (engelsk)Inngår i: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 116, nr 40, s. 9979-9984Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The carbonium ion has been suggested to be the intermediate in superacid-promoted reactions (SbF5-HF) such as hydrogen-deuterium exchange and in the electrophilic C-H cleavage into hydrogen and the carbenium ion. In this study, the superacid-promoted C-H cleavage into hydrogen and the carbenium ion was studied using density functional theory (B3LYP and M062X) and ab initio methods (MP2 and CCSD). The calculations suggest that the superacid-promoted C-H cleavage proceeds via a concerted transition state leading to hydrogen (H-2) and the carbenium ion without the formation of the elusive carbonium ion. The reactivity for the superacid promoted C-H cleavage decreases upon going from isobutane (tertiary) > propane (secondary) > isobutane (primary) > propane (primary) > ethane >> methane.

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2012. Vol. 116, nr 40, s. 9979-9984
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URN: urn:nbn:se:uu:diva-181675DOI: 10.1021/jp306319sISI: 000309648800023OAI: oai:DiVA.org:uu-181675DiVA, id: diva2:557357
Tilgjengelig fra: 2012-09-27 Laget: 2012-09-27 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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