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ROO• + R'SH -[ROOS(H)R'] -R'SO* + ROH (9) Reaction 9 is very similar in nature to reaction 8 and it is thus difficult to eliminate (9) as a competing mechanism. Further, the intermediate proposed is analogous to the intermediate [RSSS(H)R] suggested for the reaction of RSS* with RSH.37 Using bond energies of 170 kJ (0-0), 435 kJ (O-H), 380 kJ (S-H), and 360 kJ (S-O), we predict reaction 9 to be exothermic by approximately 245 kJ.38 Gilbert et al.31 found that sulfinyl radicals resulted from reaction of thiols with the Ti3+-H202 couple at pH 1-2 and their g values and hyperfine couplings (allowing for differences in rotational averaging) correlate quite well with those reported here. Although the authors reported that the (37) Nelson, D.

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