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A facile one-pot synthesis of 2,5-disubstituted-1,3,4-thiadiazoles was achieved by ultrasonic irradiation of a mixture of 1- naphthylacetyl chloride,NH<sub>4</sub>CNS,CH<sub>2</sub>Cl<sub>2</sub> and PEG-400 for 1.5 h a