Preparation of unsaturated ketones
    5.
    发明授权
    Preparation of unsaturated ketones 失效
    不饱和酮的制备

    公开(公告)号:US06184420B2

    公开(公告)日:2001-02-06

    申请号:US09150925

    申请日:1998-09-10

    IPC分类号: C07C49203

    摘要: Unsaturated ketones of the formulae Ia and Ib are prepared by a process consisting of the combination of the following reactions: a) The conventional reaction of an allyl alcohol of the formula IIa or a propargyl alcohol of the formula IIb with an isopropenyl ether of the formula III with formation of a ketal of the formula IV as a byproduct, b) preparation of the isopropenyl ether of the formula III by reacting a ketal of the formula IV with propyne or allene, or a mixture thereof in the gas phase at elevated temperatures in the presence of a heterogeneous catalyst containing zinc or cadmium together with silicon or oxygen, and c) feeding the ketal of the formula IV formed in the reaction (a) into stage (b) for the preparation of the isopropenyl ether of the formula III again.

    摘要翻译: 式Ia和Ib的不饱和酮通过由以下反应的组合组成的方法制备:a)式IIa的烯丙醇或式IIb的炔丙醇与式III的异丙烯基醚的常规反应,形成 的式I的缩酮化合物是一种副产物,b)通过使式IV的缩酮与丙炔或丙烯或其混合物在升高的温度下在存在下进行反应来制备式III的异丙烯基醚 含有锌或镉以及硅或氧的非均相催化剂,和c)将反应(a)中形成的式IV的缩酮进料到步骤(b)中,以再次制备式III的异丙烯基醚。