ELECTROCHEMICAL-BEHAVIOR OF TERT-BUTYL-2-BENZOTHIAZOLESULFENAMIDE

Electrochemical behavior of tert-butyl-2-benzothiazolesulfenamide (I), one of the powerful promoters of the rubber vulcanization process, is studied. It is shown that I is not oxidized anodically at dimensional ly stable anodes, platinum, and platinum- or iridium-coated titanium a nd is not reduced at the stainless steel and platinum cathodes. At a d ropping mercury electrode in an acid media containing I, a cathodic wa ve with E-1/2 of about -0.2 V is observed. The wave is attributed to t he reduction of corresponding mercury mercaptide formed in the precedi ng chemical reaction between I and mercury. With an increased concentr ation of I, a second wave with E-1/2 Of about -0.4 V appears, which is related to adsorption of sulfur-containing products on mercury and co mplications in the reduction at such an electrode. One more wave, caus ed by the catalytic hydrogen evolution, emerges at potentials more neg ative than -1.2 V.