titleOfInvention |
Process for preparing 1-phenyl-4-amino-5-chloropyridazone-6 by reacting 1-phenyl-4,5-dichloropyridazone-6 with gaseous ammonia in the presence of urea. The reaction proceeds at 170-220 ° C. The molar ratio of 1-phenyl-4,5-dichloropyridazone-6 to ammonia and urea is 1: 1 to 1.3: 0.04 to 1. |