Quenching of singlet (1? g ) oxygen by 2,2,6,6-tetramethylpiperidine derivatives

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Abstract
2,2,6,6-Tetramethylpiperidine-N-oxyls (III) efficiently quench singlet oxygen generated by dye sensitisation or by sodium hypochlorite–hydrogen peroxide, whereas the parent 2,2,6,6-tetramethylpiperidines exhibit only low activity.