The irradiation of a series of benzothiazolopyrazoline derivatives by UV Light in acidic medium using benzophenone as photo sensitizer resulted into rearranged pyrazolines. The effect of various substituents on the rate of photolysis and yield of the photoproducts were also studied.
A new route for the synthesis of benzothiazolopyrazoline derivatives has been developed using various chalcone derivatives and 2-hydrazinobenzothiazole and piperidine catalyst. The product obtained in shorter reaction times and piperidine behaves as good catalyst for the cycloaddition rof chalcone and 2-hydrazinobenzothiazole. The reaction carried out in aqueous-ethanol medium at reflux condition and product obtained in high yield.
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