Process for preparation of ketones
    7.
    发明授权
    Process for preparation of ketones 失效
    酮的制备方法

    公开(公告)号:US5481029A

    公开(公告)日:1996-01-02

    申请号:US233622

    申请日:1994-04-26

    摘要: A process for preparing ketones, for example CF.sub.3 C(O)CH.sub.3, CF.sub.3 C(O)CH.sub.2 C(O)CF.sub.3 and CF.sub.3 C(O)CF.sub.2 H, in which .beta.-ketoesters are transesterified and decarboxylated using a carboxylic acid, for example trifluoroacetic acid, in the presence of a catalyst, particularly an "onium" salt of a carboxylic acid or an effective amount of a proton-donating acid, preferably a sulfonic acid such as alkyl- or arylsulfonic acids, or a mineral acid. The process is advantageously carried out in the absence of water, so that no formation of acetals or hydrates occurs, and no dehydrating step is needed. The process is simple to carry out, and if transesterification is carried out with a sufficiently active carboxylic acid, for example with trifluoroacetic acid, the presence of an additional catalyst is unnecessary.

    摘要翻译: 制备酮的方法,例如CF 3 C(O)CH 3,CF 3 C(O)CH 2 C(O)CF 3和CF 3 C(O)CF 2 H),其中β-酮酯使用羧酸(例如三氟乙酸)进行酯交换和脱羧 存在催化剂,特别是羧酸的“鎓”盐或有效量的质子供体酸,优选磺酸如烷基或芳基磺酸或无机酸。 该方法有利地在没有水的情况下进行,使得不会发生缩醛或水合物的形成,并且不需要脱水步骤。 该方法很容易进行,如果用足够活泼的羧酸(例如三氟乙酸)进行酯交换反应,则不需要另外的催化剂的存在。