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(CH 2) n−1 OH] ·+ → [(CH 2) n−1 OH 2] ·+ ( 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 [(CH 2) n−1 OH 2] ·+ with respect to their classical homologs [H(CH 2) n−1 OH] ·+ 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.