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    • 4. 发明授权
    • Preparation of ionones
    • 紫罗兰酮的制备
    • US4565894A
    • 1986-01-21
    • US637890
    • 1984-08-06
    • Otto HertelHans KieferLothar Arnold
    • Otto HertelHans KieferLothar Arnold
    • C07C403/16C07C45/61C07C49/21C07C67/00C07C401/00C07C403/00
    • C07C403/16C07C2101/16
    • Ionones are prepared by cyclization of pseudoionone with concentrated sulfuric acid in the presence of an organic solvent or diluent, while cooling, and by dilution of the reaction mixture with water, by a continuous process in which the pseudoionone is combined with an aliphatic or cycloaliphatic hydrocarbon which boils at 25.degree.-65.degree. C. under the reaction conditions, or an aliphatic chlorohydrocarbon, and the sulfuric acid, with thorough mixing and evaporative cooling by partial or complete vaporization of the solvent present in the reaction mixture, combination being effected so that the temperature of the reaction mixture is from 25.degree. to 65.degree. C. and the residence time of this mixture before it is diluted with water is from 0.5 to 20, preferably from 0.1 to 5, seconds.The novel process can be used to prepare .alpha.- and .beta.-ionone in a technically simple and advantageous manner and in very good yields.
    • 紫罗兰酮是通过在有机溶剂或稀释剂的存在下,用浓硫酸环化来制备的,同时冷却,通过用水稀释反应混合物,其中将假性离子与脂族或脂环族烃结合 在反应条件下在25°-65℃下沸腾,或在脂肪族氯代烃和硫酸中,通过部分或完全蒸发存在于反应混合物中的溶剂进行充分混合和蒸发冷却,进行组合,使得 反应混合物的温度为25-65℃,该混合物在用水稀释之前的停留时间为0.5-20秒,优选为0.1-5秒。 该新方法可用于以技术上简单和有利的方式以非常好的产率制备α-和β-丁酮。