AbstractThe Rose Bengal sensitised photo‐oxidation of bioresmethrin (I), 2‐benzylfuran‐4‐ylmethyl acetate (II), and 2‐benzylfuran‐4‐ylmethanol (III) has been studied in methanol and methanol + water (1 + 1 by volume) solutions by monitoring the rate or oxygen removal from the system. The results indicate that the compounds studied are oxidised via reaction with singlet oxygen. Values for the rate constants for reaction of singlet oxygen with compounds I‐III have been determined over the temperature range 293–308 K, and the energy of activation and entropy of activation for the reactions have been determined. The data have been interpreted in terms of the site of attack of singlet oxygen
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