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    • 7. 发明授权
    • Preparation of alpha-hydroxyketones
    • α-羟基酮的制备
    • US08575394B2
    • 2013-11-05
    • US13557281
    • 2012-07-25
    • Nicole EndReinhard H. SommerladeYvonne Richter
    • Nicole EndReinhard H. SommerladeYvonne Richter
    • C07C225/00C07C223/00
    • C07F7/1892C07C45/30C07C45/58C07C49/82C07C49/83C07C49/747C07C49/84
    • A process for the preparation of an 1,1-disubstituted oxirane is disclosed, wherein an organic sulphide is reacted in a polar solvent with an educt containing a leaving group attached to a primary or secondary carbon atom, and/or the sulfonium salt formed in this way is reacted with a ketone in presence of a base and a polar solvent. Oxiranes of the type obtained may be further converted into the corresponding α-hydroxyketone or α-aminoketone, either in one step by subjecting to aerobic oxidation in the presence of a transition metal catalyst, or in two steps by hydrolyzation in the presence of an aqueous acid to the corresponding dialcohol and subsequent selective oxidation. Further described are some novel epoxide intermediates. The α-hydroxyketones and α-aminoketones thus obtainable are useful inter alia as photoinitiators.
    • 公开了一种制备1,1-二取代的环氧乙烷的方法,其中有机硫化物在极性溶剂中与含有连接到伯或仲碳原子的离去基团的离子和/或在 在碱和极性溶剂的存在下,与酮反应。 所得类型的环氧乙烷可以通过在过渡金属催化剂存在下进行有氧氧化,或者在两步骤中在水溶液存在下进行水解,可以在一个步骤中进一步转化为相应的α-羟基酮或α-氨基酮 酸至相应的二醇并随后进行选择性氧化。 进一步描述了一些新型的环氧化物中间体。 因此可获得的α-羟基酮和α-氨基酮特别可用作光引发剂。