申请人:Solvay Fluor und Derivate GmbH
公开号:US05481029A1
公开(公告)日:1996-01-02
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.
一种用于制备
酮类化合物,例如 C(O)
CH3, C(O)CH2C(O)
CF3和 C(O)
CF2H的过程,其中β-
酮酸酯在催化剂的存在下通过与一种
羧酸,例如
三氟乙酸进行酯交换和脱羧反应。所述催化剂特别是一种
羧酸的“
铵”盐或有效量的质子供体酸,优选为
磺酸,如烷基
磺酸或芳香族
磺酸,或一种矿物酸。该过程有利地在不加
水的情况下进行,以避免形成
缩醛或
水合物,且无需脱
水步骤。该过程操作简单,如果使用足够活性的
羧酸进行酯交换,例如使用
三氟乙酸,则无需额外的催化剂。