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The reactions of 2,2-diphenyl-1-picrylhydrazyl (DPPH) or 2,2-diphenyl-1-picrylhidrazine (DPPH-H) with N-bromosuccinimide (NBS) were studied. Two main compounds Br-DPPH and (Br)2 DPPH were obtained, by bromination of the starting material in para-phenyl position, and also a secondary product, N02 DPPH. It was shown that the reactions of NBS with DPPH include a substitution at the picryl group of PPH with liberation in situ of N02 (ipso-substitution of a nitro group with bromine) and subsequently N02 is scavenged by DPPH with the foundation of N02 DPPH.

THE REACTION BETWEEN 2,2-DIPHENYL-1-PICRYLHYDRAZYL FREE STABLE RADICAL AND N-BROMOSUCCINIMIDE