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The kinetics and mechanism of the base-catalyzed oxidative cleavage of l,l-bis(p-chlorophenyI)-2,2,2-trichloroethanol (la) and l,l-diphenyl-2,2,2-trichloroethanol (lb) have been studied as a function of base concentration, solvent, and temperature. The pseudo-first-order rate constant for the disappearance of both la and lb increases

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The irradiation of bipy3Ru2+ in acidic aqueous solution containing iron( 111) and colloidal Ru02.2H20, resulting in formation of O2 with a quantum efficiency of ca. 48%, has been studied. At pH 1.9, the rate of O2 formation was 2.6 x mol dm-3 min -' and the total yield of O2 obtained upon prolonged irradiation was 9.1 x lop4 mol dm-3. With mercury(I1) as electron acceptor, O2 formation was less efficient but it could be observed at pH 3 .