Double C-H activation of ethane by metal-free SO2+ radical cations (Articolo in rivista)

Type
Label
  • Double C-H activation of ethane by metal-free SO2+ radical cations (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/chem.200903588 (literal)
Alternative label
  • De Petris G. (a); Cartoni A. (a); Troiani A. (a); Barone V. (b); Cimino P. (c); Angelini G. (d); Ursini O. (d) (2010)
    Double C-H activation of ethane by metal-free SO2+ radical cations
    in Chemistry - A European Journal
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • De Petris G. (a); Cartoni A. (a); Troiani A. (a); Barone V. (b); Cimino P. (c); Angelini G. (d); Ursini O. (d) (literal)
Pagina inizio
  • 6234 (literal)
Pagina fine
  • 6242 (literal)
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  • Supporting information for this article is available on the WWW under http://dx.doi.org/10.1002/chem.200903588. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 16 (literal)
Rivista
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  • 9 (literal)
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  • 21 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • a) Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma Sapienza b) Scuola Normale Superiore Pisa c) Dipartimento di Scienze Farmaceutiche,Universit?à degli Studi di Salerno d) Istituto di Metodologie Chimiche, Area della Ricerca di Roma del CNR, CP 10, 00016 Monterotondo Stazione (RM) (Italy) (literal)
Titolo
  • Double C-H activation of ethane by metal-free SO2+ radical cations (literal)
Abstract
  • The room-temperature C-H activation of ethane by metal-free SO2 center dot+ radical cations has been investigated under different pressure regimes by mass spectrometric techniques. The major reaction channel is the conversion of ethane to ethylene accompanied by the formation of H2SO2 center dot+ the radical cation of sulfoxylic acid. The mechanism of the double C-H activation, in the absence of the single activation product HSO2+, is elucidated by kinetic studies and quantum chemical calculations. Under near single-collision conditions the reaction occurs with rate constant k = 1.0 x 10(-9) (+/-30%) cm(3) s(-1) molecule(-1), efficiency = 90%, kinetic isotope effect k(H)/k(D)=1.1, and partial H/D scrambling. The theoretical analysis shows that the interaction of SO2 center dot+ with ethane through an oxygen atom directly leads to the C-H activation intermediate. The interaction through sulfur leads to an encounter complex that rapidly converts to the same intermediate. The double C-H activation occurs by a reaction path that lies below the reactants and involves intermediates separated by very low energy barriers, which include a complex of the ethyl cation suitable to undergo H/D scrambling. Key issues in the observed reactivity are electron-transfer processes, in which a crucial role is played by geometrical constraints. The work shows how mechanistic details disclosed by the reactions of metal-free electrophiles may contribute to the current understanding of the C-H activation of ethane. (literal)
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