Hydrochloric Acid → (1E)-1-(2,4-Difluorophenyl)-1,2-propanedione 1-oxime

Participants

Reaction Conditions

Reaction Steps

A solution of 140.2 g (0.80 mol) of 1-(2,4-difluoro-phenyl)-propane-2-one in 550 g of methylcyclohexane is warmed up to 30-35° C. Over a period of 2 hours 96.6 g (0.80 mol) of isoamyl nitrite is added while a slow stream of dry hydrogen chloride is fed subsurface into the reactor. Following the end of the addition the batch is stirred for 15 minutes at 30-35° C. before the suspension is cooled to 0° C. The product is isolated by filtration and the filter cake is washed with 150 g of methylcyclohexane at 0° C.: 146.9 g of (E)-1-(2,4-difluoro-phenyl)-propane-1,2-dione 1-oxime (mp. 133-135° C.) are obtained in 89.5% yield.

Provenance & Evidence