Xanthene reacts with O2 in 45-96x H2SO4 to produce 2 mol of xanthyl cation/mol of 02. The reaction is first order in xanthene and first order in H + activity. The existence of simple acid catalysis is interpreted as due to an interaction between H+ and 0 2 to form kinetically significant amounts of the hydroperoxy cation, H02+. ualitative observations' had indicated that the oxi-
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