Rotational barriers in pentadienyl and pent-2-en-4-ynyl radicals
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 7,p. 1073-1076
- https://doi.org/10.1039/p29850001073
Abstract
The barrier to internal rotation about the C(2)–C(3) bond in pentadienyl radicals was measured by line-shape analysis of the e.s.r. spectrum in the temperature range 320–420 K. The energy difference between the trans- and cis-conformers of pent-2-en-4-ynyl radicals was obtained from the temperature variation of their equilibrium concentration ratio and the barrier to interconversion was determined by e.s.r. line-shape analysis in the range 375–450 K. The rotational barriers and the corresponding stabilisation energies were in good agreement with previous estimates.Keywords
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