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Dissociation of 3-Methylpenta-1,4-diene and the Resonance Energy of the Pentadienyl Radical

DOI: 10.1039/f19827803131

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3131 - 3136 (1982)

Update date:2022-08-04

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Authors:

Trenwith, Antony B.Trenwith, Antony B.

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Article abstract of DOI:10.1039/f19827803131

From measurements of the initial rate of formation of methane in the pyrolysis of 3-methylpenta-1,4-diene at temperatures over the range 653-716 K and pressures between 15 and 200 Torr, methane has been shown to be formed by an homogeneous, first-order process.Examination of the other products of pyrolisis shows the most reasonable mode of formation of primary methane to be followed by .The rate expression for reaction (i) is where θ=2.303 RT/cal mol-1 (1 cal=4.18 J) and this leads to D=76.4 kcal mol-1, which by comparison with the value of 95.0 for the secondary C-H bond dissociation energy in alkanes leads to a figure of 18.6+/-1.5 kcal mol-1 for the resonance stabilisation energy of the pentadienyl radical.

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