Electron Spin Resonance Study of Radicals Formed by Abstracting Hydrogen from Amides

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Abstract
Electron spin resonance (ESR) studies were made on various radicals formed from formamide, acetamide, N-methylformamide, N-methylacetamide, N,N-dimethylformamide and propionamide by hydrogen abstraction with hydroxyl radicals produced by the reaction of hydrogen peroxide and titanium trichloride in aqueous solution, using a rapid flow technique. In each case, except for formamide, various π-electron radicals were found. For formamide, N-methylformamide, and N,N-dimethylformamide, carbamoyl and its methyl substituted σ electron radicals were detected. The g factor of the σ electron radical is qualitatively discussed.