Production of coumarin
    1.
    发明授权
    Production of coumarin 失效
    生产香豆素

    公开(公告)号:US3888883A

    公开(公告)日:1975-06-10

    申请号:US38476273

    申请日:1973-08-01

    IPC分类号: C07D311/10 C07D7/28

    CPC分类号: C07D311/10

    摘要: Coumarin is produced by the thermal cyclization of o-methyl coumarate in a continuous manner by treating said o-methyl coumarate at a temperature in the range of from about 200* to about 350* C. and a liquid hourly space velocity of from about 0.1 to about 3.0.