Intramolecular hydrogen migrations in ionized aliphatic alcohols. Barton type and related rearrangements
Identifieur interne : 003A25 ( Main/Exploration ); précédent : 003A24; suivant : 003A26Intramolecular hydrogen migrations in ionized aliphatic alcohols. Barton type and related rearrangements
Auteurs : Guy Bouchoux [France] ; Nadège Choret [France]Source :
- International Journal of Mass Spectrometry [ 1387-3806 ] ; 2000.
Abstract
Molecular orbital calculations at the unified G2(MP2, SVP) level of theory have been used to examine the energy barrier for 1,n-hydrogen atom migrations in ionized aliphatic alcohols [H(CH2)n−1OH]·+ → [(CH2)n−1OH2]·+ (n = 2–5). A complementary set of experimental and theoretical data confirm that this approach leads to results accurate to within a few kJ mol−1. The better stability of distonic ions [(CH2)n−1OH2]·+ with respect to their classical homologs [H(CH2)n−1OH]·+ is clearly demonstrated by the calculations; it amounts to ∼30 kJ mol−1. Critical energies of 106, 90, 76, and 19 kJ mol−1 are calculated for n = 2, 3, 4, and 5, respectively. A lowering of the barrier height is observed when considering the energy barrier for 1,5 hydrogen atom migrations in ionized systems with respect to the neutral equivalent, i.e. the Barton rearrangement. Keywords: Ionized alcohols; Hydrogen migrations; Distonic ions; α2(MP2,SVP) molecular orbital calculations.
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DOI: 10.1016/S1387-3806(00)00158-5
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A complementary set of experimental and theoretical data confirm that this approach leads to results accurate to within a few kJ mol−1. The better stability of distonic ions [(CH2)n−1OH2]·+ with respect to their classical homologs [H(CH2)n−1OH]·+ is clearly demonstrated by the calculations; it amounts to ∼30 kJ mol−1. Critical energies of 106, 90, 76, and 19 kJ mol−1 are calculated for n = 2, 3, 4, and 5, respectively. A lowering of the barrier height is observed when considering the energy barrier for 1,5 hydrogen atom migrations in ionized systems with respect to the neutral equivalent, i.e. the Barton rearrangement. Keywords: Ionized alcohols; Hydrogen migrations; Distonic ions; α2(MP2,SVP) molecular orbital calculations.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Palaiseau</li></settlement></list><tree><country name="France"><noRegion><name sortKey="Bouchoux, Guy" sort="Bouchoux, Guy" uniqKey="Bouchoux G" first="Guy" last="Bouchoux">Guy Bouchoux</name></noRegion><name sortKey="Bouchoux, Guy" sort="Bouchoux, Guy" uniqKey="Bouchoux G" first="Guy" last="Bouchoux">Guy Bouchoux</name><name sortKey="Choret, Nadege" sort="Choret, Nadege" uniqKey="Choret N" first="Nadège" last="Choret">Nadège Choret</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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