Spin Trapping of Oxygen-centred Radicals by Substituted N-Benzylidene-tert-butylamine N-Oxides
Spin-trapping of oxygen-centred radicals (tert-butoxyl and carboxyl) by substituted N-benzylidene-tert-butylamine N-oxides (X-PBN) has been studied and the rates have been measured by means of EPR experiments.The experimental results revealed a substituent effect and are rationalized by an electron-transfer mechanism between the frontier orbitals of the reactants.The reaction pathway has been deduced from molecular-orbital and molecular-mechanics calculations.