Process for the preparation of unsaturated ethers
    52.
    发明授权
    Process for the preparation of unsaturated ethers 失效
    不饱和醚的制备方法

    公开(公告)号:US5354911A

    公开(公告)日:1994-10-11

    申请号:US178634

    申请日:1994-01-07

    CPC classification number: C07C41/28

    Abstract: A process for the preparation of ethers of the formula R.sup.1 --CR.sup.2 .dbd.CH--O--R.sup.3, in which R.sup.1 and R.sup.3 are each a radical having 1 to 6 carbon atoms and R.sup.2 is hydrogen or a radical having 1 to 2 carbon atoms, by reaction of a diacetal of the formula R.sup.1 --CHR.sup.2 --CH(--O--R.sup.3).sub.2 in the presence of a catalyst composed of an acid and an amine at elevated temperature in the liquid phase. The unsaturated ether of the above-mentioned formula is formed from the diacetal with elimination of an alcohol R.sup.3 --OH.

    Abstract translation: 制备式R1-CR2 = CH-O-R3的醚的方法,其中R 1和R 3各自为具有1至6个碳原子且R 2为氢或具有1至2个碳原子的基团,通过 在液相中在升高的温度下,在由酸和胺组成的催化剂存在下,式R 1 -CH 2 -CH(-O-R 3)2的二缩醛的反应。 上述式的不饱和醚由二缩醛形成,除去醇R3-OH。

    Process for the production of di-n-propylacetic acid
    56.
    发明授权
    Process for the production of di-n-propylacetic acid 失效
    生产二正丙基乙酸的方法

    公开(公告)号:US4317925A

    公开(公告)日:1982-03-02

    申请号:US060559

    申请日:1979-07-25

    CPC classification number: C07C45/62 C07C45/513 C07C47/02 C07C51/235

    Abstract: A process for the preparation of di-n-propylacetic acid which comprises the steps ofA. converting n-valeraldehyde-diallyl acetal into allyl-1-pentenyl ether by cleaving one mol of allyl alcohol per one mol of n-valeraldehye-diallyl acetal;B. rearranging the allyl-1-pentenyl ether thermally into 2-propyl-pent-4-en-1-al,C. partially hydrogenating the 2-propyl-pent-en-1-al catalytically to form 2-propyl valeraldehyde, andD. oxidizing the 2-propyl valeraldehyde to form dipropyl-acetic acid.

    Abstract translation: 一种制备二正丙基乙酸的方法,其包括以下步骤:通过每1摩尔正缬氨酸二烯丙基缩醛裂解一摩尔烯丙醇,将正戊醛 - 二烯丙基缩醛转化为烯丙基-1-戊烯基醚 ; B.将烯丙基-1-戊烯基醚热重排为2-丙基 - 戊-4-烯-1-醇,C.催化部分氢化2-丙基戊-1-烯,形成2-丙基戊醛, 和D.氧化2-丙基戊醛形成二丙基 - 乙酸。

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