文摘
By a new sustainable strategy, sulfur dioxide (SO<sub>2sub>) was converted at room temperature into sulfuric acid by taking advantage of the spontaneous aerial oxidation of benzothiazoline into benzothiazole. 2-(4-Methoxyphenyl)benzothiazoline (HL) was reacted with SO<sub>2sub> at room temperature, and the adduct upon reaction with aerial oxygen produced 2-(4-methoxyphenyl)benzothiazolium bisulfate. The same strategy was applied on [CdL<sub>2sub>] and [ZnL<sub>2sub>] and found to work better than neat benzothiazoline. Bunte salt, S-(2-((pyridin-1-ium-2-ylmethyl)amino)phenyl) thiosulfate, was obtained upon reacting SO<sub>2sub> with 2-(pyridin-2-yl)-2,3-dihydrobenzothiazole which is an important clue for the intermediates involved in the S-oxygenation of SO<sub>2sub> bound on electron rich centers. This sustainable route offers a new avenue of utilizing the suicidal reaction of benzothiazoline into benzothiazole in the activation of SO<sub>2sub> with the help of aerial oxygen.