Photodegradation of 2‐mercaptobenzothiazole disulfide and related benzothiazoles

Abstract

The photodegradation of 2‐mercaptobenzothiazole disulfide, 2‐mercaptobenzothiazole and benzothia‐zole was investigated. Benzothiazole was found to undergo photodimerization into 2,2′‐bibenzothiazole, and in the presence of oxygen to give two additional photoproducts ‐ 2‐hydroxybenzothiazole and 2‐methylbenzothiazole. The major degradation products of 2‐mercaptobenzothiazole are benzothiazole and 2‐benzothiazolesulfonic acid, with 2,2′‐thiobisbenzothiazole and 2‐mercaptobenzothiazole disulfide as the minor degradation products. Direct photolysis of 2‐mercaptobenzothiazole disulfide gave 2‐mercapto‐benzothiazole and in acetonitrile 2‐thiocyanatobenzothiazole was also detected. A mechanism is proposed to rationalize the formation of photodegradation products.

Nanocontainer‐Based Anticorrosive Coatings: Effect of the Container Size on the Self‐Healing Performance

“…A prolonged release is of great advantage for long‐term corrosion inhibition. The stabilization of MBT release for longer immersion times can be due to reaching a maximum MBT solubility in the release medium and/or MBT degradation to sub‐products (e.g., 2‐hydroxybenzothiazole, benzothiazole) 29. The maximum released amount of MBT differs with pH because of the pH dependent solubility of MBT 30, 31.…”

Leaching of chemicals and DOC from tire particles under simulated marine conditions

“…This suggests that the reservoir of 2-MBT in the materials is large enough not to be exhausted in this period of time. For all three materials 2-MBT leaching was lower during sunlight exposure, likely due to direct or indirect photodegradation of 2-MBT (Zajíčková and Párkányi, 2008). This photodegradation may have occurred either on the particle surface before 2-MBT was released or in solution after its release.…”

Degradation of 2-mercaptobenzothizaole in microbial electrolysis cells: Intermediates, toxicity, and microbial communities

“…The results are compiled in Table 1 and compared to the data available in the literature (Allaoui et al, 2010;B. Li et al, 2005;Borowska et al, 2016;Haroune et al, 2004;Malouki et al, 2004;Serdechnova et al, 2014;Zajíčková and Párkányi, 2009;Zajíčková and Párkányi, 2008). Only the main peaks were identified, and appropriate structures were proposed by considering the observed (m/z) ratios.…”