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1617455 
Journal Article 
DIRECT KINETIC-STUDY OF RADICAL TRANSFORMATION REACTION ME2COH + PH2CO-]ME2CO + PH2COH 
Demeter, A; Berces, T 
1991 
95 
3 
1228-1232 
WOS:A1991EW47800036 
Reaction Me2COH + Ph2CO --> Me2CO + Ph2COH (5) was studied
by laser flash photolysis under such experimental conditions where the changes in the
concentrations of ketyl radicals with reaction time were controlled by this radical
transformation process. Diphenylketyl radical concentration profiles were obtained by monitoring
transient absorption at 540 nm and the rate coefficient k5 was extracted from that part of the
concentration trajectory which was determined solely by reaction 5. Thus, k5 = (3.6 +/- 0.6) X
10(5) dm3 mol-1 s-1 was determined at 298 K in acetonitrile, which is higher than the two
recently reported values derived from quantum yields measured under steady-state conditions. A
reaction mechanism for the radical transformation process (5) is proposed in which hydrogen-
bonded species formed from ketyl radical and benzophenone participate.