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چکیده
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Highly efficient production of 4-substituted-1,2,4-triazole-3,5-diones from urazole derivatives using ammonium nitrate and silica sulfuric acid (SiO2-OSO3H), as a cheap and nontoxic catalyst, in the presence of wet SiO2 (50% w/w) under mild and heterogeneous conditions is reported. The process presented here is operationally simple, environmentally benign and produces high yield.
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