Acetic Acid → HCID 13424593, compound

Participants

Reaction Steps

200 g. portion of p-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)benzonitrile [Journal of Medicinal Chemistry 17,281 (1974)] is suspended in 500 ml. of glacial acetic acid with overhead stirring at stream bath temperature, then 56 ml. of liquid bromine is dissolved in an additional 500 ml. of acetic acid and this solution is added to the stirring mixture all at once. After approximatley half an hour of heating, a vigorous exothermic reaction occurs with the expulsion of the excess bromine and hydrogen bromide. The reaction mixture is the diluted with 4 liters of distilled water and the resulting solid is filtered and the filter cake is copiously washed with water and is air dried. This material is recrystallized from a large amount of ethyl alcohol to afford the product p-(1,6-dihydro-4-methyl-6-oxo-3-pyridazinyl)benzonitrile as a white solid.

Provenance & Evidence