Method for the production of cyclopentamethylene ketene
    80.
    发明授权
    Method for the production of cyclopentamethylene ketene 失效
    生产环戊烯酮乙烯酮的方法

    公开(公告)号:US3914313A

    公开(公告)日:1975-10-21

    申请号:US11895171

    申请日:1971-02-25

    Applicant: SNIA VISCOSA

    CPC classification number: C07C45/89 C07C49/88

    Abstract: A method is disclosed for the preparation of alicyclic ketenes, useful as intermediates in the preparation of lactams. The instant method consists in a heat treatment of an alicyclic acid, or its anhydride, in a matallic reactor exempt from nickel, at high temperatures but under subatmospherical pressures. A catalyst of the type XP(OR)3 wherein X is selected from the group consisting of oxygen, sulphur and selenium and R is an alkyl radical is preferred for accelerating the reactions. The temperatures are in the range from 550* to 750*C and the preferred pressure is under 100 millimeters of mercury. High yields and conversion rates are obtained and the purity of the end product is more than satisfactory. The method can be applied to the preparation of a number of alicyclic ketenes.

    Abstract translation: 公开了一种制备用作制备内酰胺的中间体的脂环族烯酮的方法。 本方法包括在高温下但在低于大气压的压力下,在不含镍的金属反应器中脂环酸或其酸酐的热处理。 XP(OR)3类型的催化剂,其中X选自氧,硫和硒,R是烷基,用于加速反应。 温度范围为550℃至750℃,优选的压力为100毫米汞柱。 获得高产率和转化率,最终产品的纯度令人满意。 该方法可用于制备多种脂环烯酮。

Patent Agency Ranking