The polarographic reduction of a number of substituted 3-benzylideneindol-2(3H)-ones in ethanol–water (3:2 v/v) has been studied. These exhibit one or two reduction waves depending on the supporting electrolyte and the pH of the solution. Changes in E½ are discussed in terms of the Hammett σ values.
L. G. Chatten, R. W. Daisley and C. J. Olliff, J. Chem. Soc., Perkin Trans. 2, 1973, 469 DOI: 10.1039/P29730000469
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