4-Chlorobutyryl chloride → HCID 20507190, compound

Participants

Reaction Steps

6.0 g (29.6 millimoles) of 6-(p-aminophenyl)-5-methyl-4,5-dihydropyridaz-3-one and 4.6 g (32.6 millimoles) of 4-chlorobutyryl chloride in 100 ml of absolute toluene are kept for 6 hours at 80° C. The product is filtered off at 10° C., washed with water and dried under reduced pressure at 50° C. 8.5 g (93% of theory) of 6-[p-(4-chlorobutyrylamino)-phenyl]-5-methyl-4,5-dihydropyridaz-3-one are obtained as beige crystals which, after recrystallization from methanol, melt at 176°-178° C.

Provenance & Evidence