Abstract
pKa values of a series of the titled compounds (2 a–g) together with a model compound3 have been determined spectrophotometrically in alcoholic buffered media. These values were correlated to different σ sets. The polarographic behaviour of the parent2 a and its nitro derivative2 g was studied in detail. The obtained data showed that2 a is reduced via a 2-electron process to the corresponding hydrazo from which was stabilized through hydrogen bonding.
Zusammenfassung
Es wurden diepKa-Werte einer Serie der Titelverbindungen (2 a–g) zusammen mit einer Modellverbindung3 spektrophotometrisch in alkoholischer gepufferter Lösung bestimmt. Diese Werte wurden mit verschiedenen Sets von σ-Werten korreliert. Das polarographische Verhalten der Stammverbindung2 a und deren Nitroderivat2 g wurde im Detail untersucht. Die Daten zeigen, daß2 a über einen Zweielektronenprozeß zur entsprechenden Hydrazo-Verbindung reduziert wird, die durch Wasserstoffbrücken stabilisiert ist.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Elnagdi M. H., Fahmy H. M., Morsi M. A., J. Electroanal. Chem.68, 237 (1976).
Fahmy H. M., Morsi M. A., Elnagdi M. H., Gazz. Chim. Ital.107, 565 (1977).
Fahmy H. M., Elnagdi M. H., Kandeel Z. E., Pierre G., J. Chem. Tech. Biotechnol.31, 688 (1981).
Morsi M. A., Fahmy H. M., Elnagdi M. H., Abdel Azzem M., J. Electroanal. Chem.133, 269 (1982).
Abed N. M.,El-Sayed A. M., Ind. J. Text.1984, 91.
Britton H. T. S., Hydrogen Ions, 4th. edn., Vol. 1, p. 365. London: Chapman and Hall. 1951.
Issa R. M., Hamman A. S., Etaiw S. H., Z. Phys. Chem.251, 177 (1972).
Jaffe H. H., Chem. Rev.53, 191 (1953).
Jackson R. A., Mechanism, an Introduction to the Study of Organic Reactions, p. 110. Oxford: Clarendon Press. 1972.
Mairanovskii S. G., J. Electroanal. Chem.4, 166 (1962).
Fahmy H. M., Elnagdi M. H., Ibrahim L. I., Ind. J. Chem.198, 644 (1980).
Darwish S.,Fahmy H. M.,Aziz M. A.,El Maghraby A. A., J. Chem. Soc. Perk. II1981, 344.
Sakla A. B., Fahmy H. M., Aboutabl M. A., J. Electroanal. Chem.90, 261 (1978).
Pearson J., Trans. Faraday Soc.44, 683 (1943).
Lund H., in: Cathodic Reduction of Nitro Compounds in Organic Electrochemistry (Baizer M. M., ed.), Ch. 7, p. 315. New York: Marcel Dekker. 1973.
Feigl F., Spot Tests in Organic Analysis, p. 243. New York: Elsevier. 1983.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Abed, N.M., Nashed, B., Fahmy, H.M. et al. Ionization and electroreduction of some benzthiazin-4-one azodyes. Monatsh Chem 117, 599–605 (1986). https://doi.org/10.1007/BF00817896
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00817896