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研究了利用二（三氯甲基）碳酸酯代替光气与吡唑磺酰胺反应，然后再与２－氨基－４，６－ 二甲氧基嘧啶反应合成吡嘧黄隆的方法．反应安全、条件温和，从根本上消除了光气的危险性。
A method for synthesizing pyrimethalone using 2 (trichloromethyl) carbonate instead of phosgene and pyrazole sulfonamide and then reacting with 2-amino-4,6-dimethoxypyrimidine was also studied. The reaction is safe and the conditions are mild, which fundamentally eliminates the danger of phosgene.