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    Process for producing conjugated dienes
    3.
    发明授权
    Process for producing conjugated dienes 失效
    共轭二烯的制备方法

    公开(公告)号：US4338478A

    公开(公告)日：1982-07-06

    申请号：US218018

    申请日：1980-12-18

    申请人： Sunao Kyo ,  Katsumi Omura ,  Ken-ichi Hino

    发明人： Sunao Kyo ,  Katsumi Omura ,  Ken-ichi Hino

    IPC分类号： C07C1/24

    CPC分类号： C07C1/24 ,  C07C2521/02

    摘要： A process for producing a conjugated diene represented by the general formula ##STR1## wherein R.sub.3, R.sub.4 and R.sub.5 each represent a hydrogen atom, or any one of them represents a methyl group and the other two each represent a hydrogen atom,which comprises heating an alkane-1,3-diol represented by the general formula ##STR2## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom, or one of them represents a hydrogen atom and the other represents a methyl group,to a temperature of at least 130.degree. C. in the liquid phase in the presence of water and a boron-oxyacid or an oxygen-containing boron compound capable of forming a boron-oxyacid it under the reaction conditions.

    摘要翻译： 一种制备由通式“IMAGE”表示的共轭二烯的方法，其中R 3，R 4和R 5各自表示氢原子，或者它们中的任何一个表示甲基，另外两个表示氢原子，其包括加热 由通式表示的烷烃-1,3-二醇，其中R 1和R 2各自表示氢原子，或其中一个表示氢原子，另一个表示甲基，至少为130℃ 在液相中，在反应条件下，在水和硼 - 含氧酸或含硼的硼化合物的存在下，能够形成含硼的含硼酸。

    Process for producing isoprene
    5.
    发明授权
    Process for producing isoprene 失效

    公开(公告)号：US4381416A

    公开(公告)日：1983-04-26

    申请号：US211712

    申请日：1980-12-01

    申请人： Sunao Kyo ,  Tumoru Renge ,  Katsumi Omura

    发明人： Sunao Kyo ,  Tumoru Renge ,  Katsumi Omura

    IPC分类号： C07C1/00 ,  C07C1/20 ,  C07C11/18 ,  C07C67/00 ,  C07C1/24

    CPC分类号： C07C1/20 ,  Y02P20/582

    摘要： A process for producing isoprene, which comprises decomposing a mixture of at least two compounds represented by the general formula ##STR1## wherein (i) W and Y each represent a hydrogen atom, and X and Z are identical or different and each represent the group OR, (ii) W and X together form a single bond, Y represents a hydrogen atom and Z represents the group OR, (iii) W represents a hydrogen atom, X and Y together form a single bond, and Z represents the group OR, or (iv) W represents a hydrogen atom, X represents the group OR, and Y and Z together form a single bond, in which R represents a hydrogen atom, a methyl group, a methoxymethyl group, a methylbutenyl group, a methylbutenyloxymethyl group, a 1,1-dimethyl-3-hydroxypropyl group, a 1,1-dimethyl-3-hydroxypropyloxymethyl group, a 3-methyl-3-hydroxybutyl group, a 3-methyl-3-hydroxybutyloxymethyl group, a 1,1-dimethyl-3-methoxypropyl group, a 1,1-dimethyl-3-methoxypropyloxymethyl group, a 3-methyl-3-methoxybutyl group or a 3-methyl-3-methoxybutyloxymethyl group, at least one compound of the mixture being a compound of general formula (I) in which R is a methoxymethyl group, a methylbutenyloxymethyl group, a 1,1-dimethyl-3-hydroxypropyloxymethyl group, a 3-methyl-3-hydroxybutyloxymethyl group, a 1,1-dimethyl-3-methoxypropyloxymethyl group or a 3-methyl-3-methoxybutyloxymethyl group, in the presence of water and an oxygen-containing boron compound selected from the group consisting of boron-oxyacids and boron compounds capable of generating the boron-oxyacids in situ under the reaction conditions, in the liquid phase at a temperature of at least 150.degree. C. while adjusting the ratio of the oxygen-containing boron compound to the entire water present in the reaction system such that the weight ratio of ortho-boric acid to water, calculated on the assumption that all the oxygen-containing boron compound changes in aqueous solution to orthoboric acid, is at least maintained at 15:85.