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Electron-Transfer Effects in Conjugated Isothiocyanate Systems

A. Martvoň, A. Beňo, and M. Uher

Department of Organic Chemistry, Slovak Technical University, Bratislava 1

 

Abstract: Some effects of the substituents in 4'-substituted 4-isothiocyanato derivatives of stilbenes, phenyl ethers, diphenylmethanes, diphenyl sulfones, and diphenyl sulfides upon the Polarographie reduction of the isothiocyanato group in Bffitton—Welford buffer have been studied. Under the working conditions —NCS group is reduced which shows itself by a double electron wave. In all systems studied there is a linear relationship between Е1/2 values of —NCS group and aP constants of the substituents. The found reaction constants £л,в, were compared with those found by earlier authors. On the basis of these comparisons the electron-transfer effects in the conjugated systems are discussed. It has been found that the hindering effect of the linking groups upon the transfer of the electron effects in the studied systems is as follows: CH=CH < S ≤ О≤ CH2 < SO2 .

Full paper in Portable Document Format: 262a163.pdf

 

Chemical Papers 26 (2) 163–167 (1972)

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