The radical H2C -CO -CH3 was produced in an acetone/H2O/H2O2 solution by photolysis using techniques similar to those developed by LIVINGSTON and ZELDES. The temperature dependence of the ESR spectrum indicates restricted rotation of the CH2-group relative to the rest of the molecule. A complete line-shape analysis of the spectrum at various temperatures leads to Arrhenius-para-meters Ea= (9.4 ± 0.5) kcal/mol and 10log k0 = 12.9 ± 0.3 which can be interpreted in the frame of the simple HMO theory.

The anion radicals of para-X-acetophenone (X = NO

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Die Anionradikale der Acetophenone (I) wurden durch elektrolytische Reduktion in DMF erzeugt und ESR‐spektroskopisch untersucht.