Flash Photolysis Study of Solvent Effects in Addition Reactions of Thiyl Radicals to Styrene or α-Methylstyrene. Interaction between p-Chlorobenzenethiyl Radical and Methylbenzenes

Article abstract of DOI:10.1021/j100208a034

The absorption spectra and the absolute rate constants of the addition reactions of the para-substituted benzenethiyl radicals to styrene and α-methylstyrene in cyclohexane and in ?-electron-donor solvents such as benzene and mesitylene have been determined by flash photolysis.Broadenings of the absorption bands of the p-chlorobenzenethiyl radical observed in ?-donor solvents were ascribed to the weak interaction between the radical center and ? electrons of solvents; the addition rate constants to styrenes in mesitylene were smaller than those in cyclohexane (1:1.5).No appreciable solvent effect was observed both in the spectra and in the rates of the p-methylbenzenethiyl radical.