Ammonia → 4-Acrylamido-4-methyl-2-pentanone

Beteiligte Stoffe

Reaktionsschritte

A process for preparing N-(1,1-dimethyl-3-oxobutyl)acrylamide which comprises (1) contacting a dispersion of 5,6-dihydro-6-hydroxy-4,4,6-trimethyl-2-vinyl-1,3(4H)-oxazine sulfate (1:1) in a water-immiscible organic solvent with a neutralizing or alkalizing amount of gaseous ammonia at a temperature between about 10° C. and 30° C. to form a solution of diacetone acrylamide in said organic solvent and a precipitate of crystalline ammonium sulfate; (2) separating the crystals of ammonium sulfate; (3) cooling the organic mother liquors recovered from step (2) to about -10° C. to 20° C. to crystallize N-(1,1-dimethyl-3-oxobutyl)acrylamide therefrom; and (4) recovering the crystals of N-(1,1-dimethyl-3-oxobutyl)acrylamide, washing the recovered crystals with a cold water-immiscible organic solvent, and drying the same.

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