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    • 7. 发明授权
    • Process for preparing acetonin
    • 制备乙酰丙酮的方法
    • US3943134A
    • 1976-03-09
    • US515815
    • 1974-10-18
    • Shigeo KajiyamaTakamitsu KobayashiKeiro Yoshizue
    • Shigeo KajiyamaTakamitsu KobayashiKeiro Yoshizue
    • C07D239/06C07D239/04
    • C07D239/06
    • 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.
    • 2,2,4,4,6-五甲基-2,3,4,5-四氢嘧啶,称为乙炔二酮,是通过丙酮与氨在卤化铵催化剂存在下反应制备的,并且在0.01至0.5摩尔 %(基于丙酮)的促进剂,其选自:溴; 碘; 三氯化碘; 碱金属碘化物; 硫氰酸锂,溴化物,硝酸根和氰化物; 碘化铵,硫化铑,溴化物,硝酸盐和硫化物; 羧酸和磺酸的铵盐; 含氮有机碱与羧酸和磺酸的盐; 脂肪胺氢碘酸盐; 羧酸; 和磺酸。