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Rate constants for the reactions of alkyl radicals with 1,4‐cyclohexadiene
Author(s) -
Hawari J. A.,
Engel P. S.,
Griller D.
Publication year - 1985
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550171107
Subject(s) - chemistry , radical , electron paramagnetic resonance , reaction rate constant , alkyl , photochemistry , medicinal chemistry , kinetics , organic chemistry , nuclear magnetic resonance , physics , quantum mechanics
An electron paramagnetic resonance ( EPR ) technique was used to show that simple alkyl radicals readily abstract hydrogen from 1,4‐cyclohexadiene. Rate constants for the reaction were ca. 10 4 –10 5 M −1 s −1 at 300 K and activation energies 5–7 kcal mol −1 . For the stabilized radicals, allyl and benzyl, the rate constants were <10 2 M −1 s −1 at 300 K. The data suggest that 1,4‐cyclohexadiene could be used as an effective trap to probe rearrangement reactions of carbon centered radicals and biradicals.