Abstract
Reactions of DHA with aromatic amines in ethanol produced fairly stable esr signals with characteristic hyperfine structures that indicated the presence of the aromatic moiety in the radical molecules. Several intermediates of ninhydrin reactions, i.e., carbinolamines and SchifF bases, were isolated and these two were found to give rise to similar esr signals when subjected to reaction with ascorbic acid. This also provided basis for the elucidation of the structures of the radical species from the reaction of DHA and aromatic amines.
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