申请人:Wyckoff Chemical Company, Inc.
公开号:US05728834A1
公开(公告)日:1998-03-17
A process for preparing 4-aryl-1,2,4-triazol-3-ones and 4-aryl-5-alkoxy-1,2,4-triazol-3-ones. A reaction mixture includes a primary aromatic amine, an alkyl carbazate and a trialkyl orthoformate. The reactants are heated in a reaction vessel in the presence of an acid catalyst and a polar solvent. After the reaction is complete, the solvent is removed, water is added, and the slurry is filtered to isolate 4-aryl-5-alkoxy-1,2,4-triazol-3-one. Alternatively, after the reaction is complete, an alkali metal alkoxide is added to the reaction mixture in the vessel, and the new mixture is again heated until the reaction is complete. The solvent is distilled from the mixture, and the remaining mixture is diluted with water. The slurry is separated from mixture, washed and dried to obtain 4-aryl-1,2,4-triazol-3-one in near 100% yield.
一种制备4-芳基-1,2,4-三唑-3-酮和4-芳基-5-烷氧基-1,2,4-三唑-3-酮的方法。反应混合物包括一种主要芳香胺,一种烷基卡巴泽和一种三烷基正酯。在酸催化剂和极性溶剂的存在下,反应物在反应容器中加热。反应完成后,去除溶剂,加入水,过滤淤泥以分离出4-芳基-5-烷氧基-1,2,4-三唑-3-酮。或者,在反应完成后,向反应容器中加入一种碱金属烷氧化物,再次加热混合物直至反应完成。从混合物中蒸馏出溶剂,剩余的混合物被稀释水。将淤泥从混合物中分离,洗涤并干燥以获得近100%的4-芳基-1,2,4-三唑-3-酮收率。