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■ Polarographic Reduction of Substituted Piperidinobenzamidrazones. Structure-Reactivity Relationships

Ahmad S. Shawali,* Sayed S. Abdel Rehim, Mohamed A. Negied and Cyril Párkányi*

*Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt

Abstract

Polarogaphic reduction of a series of substituted piperidino benzamidrazones, 2a-2h, along with the unsubstituted benzamidrazone 3 has heen investigated in 40% (vol.) ethanolic Britton-Robinson buffers. For the sake of comparison, also the polarographic reduction of benzaldehyde phenylhydrazone 4, benzaldehyde p-nitrophenylhydarazone 5, and benzamidine 6 has been studied under similar conditions. The assignment of the waves and the reduction scheme are outlined. The E_1/2 values of the polarographic waves were correlated with the Hammett substituent constants.