Free radical oxidation of dihydric phenols with diphenylpicrylhydrazyl.
A spectrophotometric study has been made of the reactions between the free radical 2,2-dipheny1-1-picrylhydrazyl (DPPH) and the three dihydric phenols. It has been shown that water affects the rate of all three reactions and the stoichiometry of the DPPH-catechol (pyrocatechol) reaction. Because of the differences in the rate of oxidation in absolute ethanol, it is possible to determine selectively either hydroquinone or catechol in the presence of resorcinol.
Schenk
G H
GH
Department of Chemistry, Wayne State University, Detroit 2, Michigan, U.S.A.
Brown
D J
DJ