p-Toluenesulfonic acid → N,N-dimethyl-2-hydroxyimino-3-(4-methoxyphenylimino)butyramide

Participants

Reaction Steps

a mixture of 142 parts of N,N-dimethyl-2-hydroxyiminoacetoacetamide (a compound of Formula III), 1200 parts of toluene, 123 parts of p-anisidine and 1 part of p-toluenesulfonic acid was refluxed overnight in a flask fitted with a Dean-Stark distilling trap and water condenser. Eighteen parts of water were removed in this manner. On cooling, a heavy slurry of solid product precipitated. This was filtered and washed with butyl chloride thereby providing a product which melted at 201.5°-203° C. Recrystallization from acetonitrile gave 151 parts of N,N-dimethyl-2-hydroxyimino-3-(4-methoxyphenylimino)butyramide (a compound of Formula II) as a yellow solid, m.p. 204°-205.5° C.

Provenance & Evidence