23.
    发明专利
    失效

    公开(公告)号:JPS4815955B1

    公开(公告)日:1973-05-18

    申请号:JP10548570

    申请日:1970-12-01

    A method of preparing omega -lactams, in particular caprolactam
    27.
    发明公开
    A method of preparing omega -lactams, in particular caprolactam 失效
    制备OMEGA-LACTAMS,特别是CAPROLACTAM的方法

    公开(公告)号:EP0197408A3

    公开(公告)日:1990-03-14

    申请号:EP86103982.4

    申请日:1986-03-22

    CPC classification number: C07D201/08

    Abstract: A method of preparing ω -lactams, in particular caprolactam, comprising: a step of premixing cycloaliphatic acids having the formula
    where n = 3 - 13, with a dehydrating agent; the first step of reaction with a nitrosating agent; the second step of reaction with the addition of a very small amount of water corresponding to a molar ratio U = H 2 O/SO 3 within the 0.1 to 0.9 range; and the step of reclaiming the unreacted cycloaliphatic acid. The method affords improved output from the lactamization reaction and reduced byproducts.

    Abstract translation: 一种制备ω-内酰胺,特别是己内酰胺的方法,包括:用脱水剂将具有式“IMAGE”其中n = 3-13的脂环族酸预混合的步骤; 与亚硝化剂反应的第一步; 第二步反应加入相当于0.1至0.9范围内的摩尔比U = H 2 O / SO 3的非常少量的水; 以及回收未反应的脂环族酸的步骤。 该方法提高了内酰胺化反应的产率和减少的副产物。

Patent Agency Ranking