Process for preparing acetonin
AssigneeSankyo Company, Limited
InventorsShigeo Kajiyama, Takamitsu Kobayashi, Keiro Yoshizue
Life of this patent
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Abstract
2,2,4,4,6-Pentamethyl-2,3,4,5-tetrahydropyrimidine, called acetonin, is prepared by reacting acetone with ammonia in the presence of an ammonium halide catalyst and in the presence of from 0.01 to 0.5 mole % (based on acetone) of a promoter selected from the group consisting of: bromine; iodine; iodine trichloride; alkali metal iodides; lithium rhodanide, bromide, nitrate and cyanide; ammonium iodide, rhodanide, bromide, nitrate and sulfide; ammonium salts of carboxylic acids and of sulfonic acids; salts of nitrogen-containing organic bases with carboxylic acids and with sulfonic acids; aliphatic amine hydroiodides; carboxylic acids; and sulfonic acids.
Claims8
A process for the preparation of acetonin by reacting acetone with ammonia in the presence of an ammonium halide catalyst and in the additional presence of from 0.01 to 0.5 mole & based on the acetone of a promoter different from said catalyst and selected from the group consisting of bromine, iodine, iodine trichloride, ammonium iodide, alkali metal iodides, hydroiodides of aliphatic amines having from 1 to 12 carbon atoms, ammonium sulfide, ammonium rhodanide, ammonium bromide, ammonium nitrate, lithium cyanide, lithium rhodanide, lithium bromide, lithium nitrate, haloacetic acids, methanesulfonic acid, benzenesulfonic acid, p-toluensulfonic acid, ammonium formate, ammonium halocacetates, ammonium methanesulfonate, ammonium benzenesulfonate and ammonium p-toluenesulfonate.
Dependencies are inferred from the claim text.