ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Oxidation and disproportionation of 2-(p-N,N-diethylaminophenylhydrazo)-7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzothiazole

V. Madajová, V. Zelenská, and I. Zelenský

Department of Analytical Chemistry, Faculty of Natural Sciences, Komenský University, S16 50 Bratislava

Abstract: The title hydrazo compd. is not oxidizable by the O of air in 2 N-H₂SO₄, but is instantaneously oxidized by a soln. of K₃Fe(CN)₆ to give an azo compd. The rate of oxidn. by O increases with the pH, and in 2 N-NaOH is limited only by the rate of diffusion of O into the soln. In the presence of excess hydrazo compd., 2 mol azo compd. arise from 2 mol the hydrazo compd. and 1 mol O. In the presence of excess O, equimolar amts. of azo compd. and H₂O₂ are formed. The rate of disproportionation is not a monotonic function of [H⁺]. The disproportionation rate is not a monotonic function of [H⁺], but reaches its highest value in neutral medium and is practically negligible in 2 N-H₂SO₄ or 2 N-NaOH.

Full paper in Portable Document Format: 325a677.pdf

Chemical Papers 32 (5) 677–683 (1978)