Abstract
1. The process of transfer of hydrogen from ketyl radicals to azomethine dyes proceeds through a transition state (or intermediate complex) with charge transfer from ketyl radicals to the dyes. 2. Azomethine dyes — derivatives of anilides of acylacetic acids — are far less active in the reaction with ketyl radicals than pyrazolone dyes. 3. The reducing activity of the radicals with respect to azomethine dyes decreases in the series: ketyl of acetone > ketyl of acetophenone > ketyl of benzophenone > neutral semiquinone radicals.
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