42509-62-6Relevant articles and documents
Process for the production of 1-substituted-3-hydroxy-5-chloro-1,2,4-triazoles
-
, (2008/06/13)
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.
Process for the production of 1,2,4-triazole derivatives
-
, (2008/06/13)
Process for the production of 1-alkyl-3-hydroxy-5-chloro-1,2,4-triazoles wherein an alkylhydrazine is reacted in an inert solvent in the presence of an acid binding agent with cyanogen chloride to 1-alkyl-1-cyanohydrazine which is subsequently cyclized with phosgene.