申请人:Ciba-Geigy Corporation
公开号:US04252965A1
公开(公告)日:1981-02-24
An improved process is provided for the production of 1-substituted-3-hydroxy-5-chloro-1,2,4-triazoles which involves reacting in dilute solution a 1-substituted-1-cyanohydrazine with phosgene in tetrahydrofuran as the specific inert solvent, treating the reaction mixture with anhydrous ammonia to form an ammonium salt of the 1,2,4-triazole, said ammonium salt being insoluble in tetrahydrofuran, and liberating from said isolated salt the 1,2,4-triazole in yields from about 85 to 92% of theory and in very pure state by treating said salt with an acid. The 1,2,4-triazoles are valuable intermediates in the manufacture of pesticides.
提供了一种改进的工艺用于生产1-取代-3-羟基-5-氯-1,2,4-三唑,该工艺涉及在稀溶液中反应1-取代-1-氰基腙与光气在四氢呋喃中作为特定的惰性溶剂,用无水氨处理反应混合物以形成1,2,4-三唑的铵盐,所述铵盐在四氢呋喃中不溶,通过用酸处理所述隔离盐从中释放1,2,4-三唑,产率为理论收率的85%至92%,且为非常纯净状态。1,2,4-三唑是制造杀虫剂的有价值的中间体。