Gas-phase eliminations. Part VII. The pyrolysis of substituted 1-phenylethyl chlorides
- 1 January 1968
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 805-808
- https://doi.org/10.1039/j29680000805
Abstract
The kinetics of the thermal decompositions of X·C6H4·CHClCH3 into olefin and hydrogen chloride (X =p-Me, m-Me, p-F, H, p-Cl, p-Br, and p-CN) are reported and shown to be homogeneous unimolecular reactions. Arrhenius parameters are listed, together with the rates relative to the unsubstituted compound at 308°. The logarithms of these latter quantities when plotted against σ+ yield a straight line of slope –1·4. It is concluded that a moderate degree of charge separation is involved in the transition states of these reactions. An appendix reports and discusses the rate of pyrolysis of 2-phenylethyl chloride and bromide at 425·5° and 385·5° respectively.Keywords
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