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Urban Sources of Micropollutants: from the Catchment to the Lake
Published in Nathalie Chèvre, Andrew Barry, Florence Bonvin, Neil Graham, Jean-Luc Loizeau, Hans-Rudolf Pfeifer, Luca Rossi, Torsten Vennemann, Micropollutants in Large Lakes, 2018
Jonas Margot, Luca Rossi, D. A. Barry
Benzothiazoles are also high-production-volume chemicals with various applications, the main one as vulcanization accelerators in rubber, but they are also employed as corrosion inhibitors in antifreeze and cooling liquids, in wood preservation or in industrial processes. The main benzothiazoles reported in municipal wastewater, coming from urban runoff (tire abrasion on roads) and unknown sources in households, were benzothiazole-2-sulfonic acid (BTSA), benzothiazole (BT), 2-hydroxybenzothi- azole (OHBT) and 2-methylthiobenzothiazole (MTBT). Their individual concentrations in raw wastewater were in the range of 0.2-2 pg l−1 (Asimakopoulos et al., 2013; Kloepfer et al., 2005; Reemtsma et al., 2006; Stasinakis et al., 2013).
Core/shell structured ZnO@SiO2-TTIP composite nanoparticles as an effective catalyst for the synthesis of 2-substituted benzimidazoles and benzothiazoles
Published in Journal of Experimental Nanoscience, 2018
To a premixed solution of ZnO@SiO2 (0.025 g) and TTIP (0.6 mmol, 0.2 mL) in EtOH (6 mL) was added 1,2-phenylenediamine (1 mmol, 0.1 g), aryl aldehyde (1 mmol) and 30% H2O2 (2 mmol, 0.2 mL); then, the mixture was stirred at room temperature. The progress of the reaction was monitored by TLC to determine the necessary reaction times (Table 3). After completion of the reaction, the catalyst was removed by filtration and was reused in the next run. The filtrate was poured into ethyl acetate and n-hexane. The pure solid product was filtered and dried to produce 2-substituted benzimidazole derivative in excellent yield. An identical procedure was employed using 2-aminothiophenol (1 mmol, 0.1 mL), aryl aldehyde (1 mmol) in the presence of 30% H2O2 (2 mmol, 0.2 mL), ZnO@SiO2 (0.025 g) and TTIP (0.6 mmol, 0.2 mL) for the synthesis of 2-substituted benzothiazoles (Table 4).
Metallonucleases encompassing curcumin, 2-aminobenzothiazole and o-phenylenediamine: a search for new metallonucleases
Published in Inorganic and Nano-Metal Chemistry, 2021
Natarajan Raman, Thiravidamani Chandrasekar
Two important properties of 2-aminobenzothiazole molecule such as the tautomerism of its delocalized dienyl system N–C–N and the fact that a C = N–H imine group is at the same time a base and a very reactive acid[40] which make it a good candidate for coordination studies. The derivatives of benzothiazole have enormous application in the field of medicine and therapeutic fields. A few of them have been investigated as anti-inflammatory, antitumor drug, Parkinson's disease and antihistaminic. The thiazole derivatives also play a vital role in the treatment against cancer and antibacterial agents. Their structural unit identified in antioxidant, anti-inflammatory, herbicides, antibiotics, thermoplastic polymers[41] and flavoring and odor agents and responsible for the bioluminescence of fire flies.[42]o-Phenylenediamine has received more attention due to its synthetic flexibility, rich coordination chemistry and application in catalysis, medicine as antibiotics and anti-inflammatory agent and in the industry as anticorrosion. Related unsymmetrical Schiff bases have received less attention. The unsymmetrical Schiff bases of 1,2-diamines may be of more practical importance due to the presence of the different reactive centers located in the compounds. Unsymmetrical Schiff bases are important in understanding the process of metal binding in metalloproteins and metalloenzymes in the body.[43–47] Herein, we have tried to synthesize four metal complexes using the curcumin based Schiff base and o-phenylenediamine which are found to be good metallonucleases.