Abstract
Abstract— The production of free radicals by reaction of 2,2,6,6‐tetramethyl‐4‐piperidinol with singlet oxygen was studied by EPR spectroscopy. The rate constant of the amine was found to be equal to 8 ×105M‐1s‐1 in ethanol and to 4 × 107M‐1s‐1 in phosphate buffer (pH 8). Competition experiments were performed with singlet oxygen quenchers such as NaN3, DABCO and the quenching rate constants were found to be consistent with the literature values. The EPR method proved to be a valuable technique to study the reaction of singlet O2 with the sterically hindered amine without any interfering effect.
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