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## Abstract 2,4‐Dimethylhexene‐l has been decomposed in single‐pulse shock tube experiments. Rate expressions for the initial reactions are and sec^−1^ at 1.5–5 atm and 1050°K. This leads to Δ__H__^°^~f300~ (CH~2~ = C(CH~3~)CH~2~) = 124 kJ/mol, or an allylic resonance energy of 50 kJ/mol. Rate expressions for the decomposition of the appropriate olefins which yield isobutenyl radicals and methyl, ethyl, isopropyl, __n__‐propyl, __t__‐butyl, and __t__‐amyl radicals, respectively, are presented. The rate expression for the decomposition of isobutenyl radical is (at the beginning of the fall‐off region). For the combination of isobutenyl and methyl radicals, the rate constant at 1020°K is Combination of this number and the calculated rate expression for 2‐methylbutene‐1 decomposition gives __S__. (1100) = 470 J/mol °K. This yields It is demonstrated that an upper limit for the rate of hydrogen abstraction by isobutenyl from toluene is

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Author

Wing Tsang

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0538-8066)

Published

1973

Language

EN

Field

Chemistry (Physical Sciences)