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18 条记录 (耗时 0.019 秒)

    Method for the preparation of dialkylchlorosilanes
    2.
    发明授权
    Method for the preparation of dialkylchlorosilanes 失效
    制备二烷基氯硅烷的方法

    公开(公告)号：US4115426A

    公开(公告)日：1978-09-19

    申请号：US871848

    申请日：1978-01-24

    申请人： Takeshi Hiiro ,  Hideki Sakurai ,  Fumihiko Kondo

    发明人： Takeshi Hiiro ,  Hideki Sakurai ,  Fumihiko Kondo

    IPC分类号： C07F7/12

    CPC分类号： C07F7/126

    摘要： A novel and effective method for the synthetic preparation of dialkylchlorosilanes as an important intermediate in the silicone industry is provided, which is based on the selectivity of a specific combination of a reaction solvent and a reducing agent in the dechlorination-reduction of one of the two silicon-bonded chlorine atoms present in a dialkyldichlorosilane to convert the Si-Cl linkages to Si-H. The reaction solvent used is either N,N'-dimethylimidazolidinone or N,N,N',N',N",N"-hexamethyl-phosphoric triamide, while the reducing agent is sodium borohydride, optionally in combination with sodium hydride.

    Process for preparing cyclic urea derivatives
    4.
    发明授权
    Process for preparing cyclic urea derivatives 失效
    制备环脲衍生物的方法

    公开(公告)号：US4617400A

    公开(公告)日：1986-10-14

    申请号：US744986

    申请日：1985-09-11

    申请人： Kazuhisa Ito ,  Yoshio Fukuda

    发明人： Kazuhisa Ito ,  Yoshio Fukuda

    IPC分类号： C07D233/32 ,  C07D239/10

    CPC分类号： C07D239/10 ,  C07D233/32

    摘要： A process for preparing a cyclic N,N'-dimethyl urea derivative by reacting a cyclic urea compound with formaldehyde, in a medium, in the presence of hydrogen and a hydrogenation catalyst. The reaction is carried out in the presence of a solid acid obtained by calcining sulfuric acid and aluminum oxide or sulfuric acid, phosphoric acid and aluminum oxide.

    摘要翻译： 一种环状N，N'-二甲基脲衍生物通过环状脲化合物与甲醛反应，在介质中，在氢气和氢化催化剂存在下制备的方法。 反应在通过煅烧硫酸和氧化铝或硫酸，磷酸和氧化铝获得的固体酸的存在下进行。

    Modified catalyst for stereo-differentiating reduction of _carbonyl compounds and process for reduction with same catalyst
    5.
    发明授权
    Modified catalyst for stereo-differentiating reduction of _carbonyl compounds and process for reduction with same catalyst 失效
    用于立体分解还原羰基化合物的改性催化剂和用相同催化剂还原的方法

    公开(公告)号：US4273933A

    公开(公告)日：1981-06-16

    申请号：US33150

    申请日：1979-04-25

    申请人： Tadao Harada ,  Yoshiharu Izumi ,  Shinichiro Komatsu

    发明人： Tadao Harada ,  Yoshiharu Izumi ,  Shinichiro Komatsu

    IPC分类号： B01J23/755 ,  C07C29/145 ,  C07C69/675 ,  C07C31/20 ,  C07C31/26 ,  C07C33/26

    CPC分类号： B01J23/755 ,  C07C29/145 ,  C07B2200/07

    摘要： A modified nickel catalyst used for stereo-differentiating reduction of carbonyl compounds is provided. The modified nickel catalyst is prepared by soaking a nickel catalyst in an aqueous modifying medium having dissolved therein at least one inorganic salt, such as sodium bromide or sodium chloride, and at least one optically active substance, such as optically active hydroxy acid. The modified nickel catalyst exhibits enhanced activity for stereo-differentiating reduction and causes little or no side reactions, and thus, brings about an extremely high yield of the reaction product.

    摘要翻译： 提供了用于立体分解还原羰基化合物的改性镍催化剂。 通过将镍催化剂浸渍在其中溶解有至少一种无机盐如溴化钠或氯化钠的水性改性介质和至少一种光学活性物质如光学活性羟基酸来制备改性镍催化剂。 改性镍催化剂表现出增强的立体分解还原活性，很少或没有副反应，从而产生极高的反应产物产率。