Pulse radiolysis of I , 1 -diphenylethylene (DPE) in methanol in the presence of oxygen, as well as of 1,l -diphenyl-2-chloroethylene (DPE-2-C1), 1,l-diphenyl-1-chloroethane (DP-1-C1-Et) and 1,l -diphenyl-2-chloroethane (DP-2-Cl-Et) in methanol saturated with argon, was performed. The products formed under pulse-radiolysis conditions were also analysed. Spectroscopic and kinetic data of the corresponding transients are presented. The reaction rate constants determined in methanol areIt has been established that the solutes are primarily attacked by e; and H, whereas the CH,OH species (or 0,) react with the intermediates thus produced. Reaction mechanisms consistent with the spectroscopic and kinetic data are presented.
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