Process for the preparation of 3-chloropropionic acid
    2.
    发明授权
    Process for the preparation of 3-chloropropionic acid 失效
    3-氯丙酸的制备方法

    公开(公告)号:US5731469A

    公开(公告)日:1998-03-24

    申请号:US610616

    申请日:1996-03-04

    CPC分类号: C07C51/363

    摘要: A process for the preparation of 3-chloropropionic acid consists especially in simultaneously introducing hydrochloric acid gas and acrylic acid at a molar ratio of 0.7:1 to 1.3:1 into a sediment consisting of 3-chloropropionic acid optionally diluted with water or with an aqueous hydrochloric acid solution.

    摘要翻译: 制备3-氯丙酸的方法特别包括将盐酸气体和丙烯酸以0.7:1至1.3:1的摩尔比同时引入到由3-氯丙酸组成的沉淀物中,所述沉淀物任选地用水稀释或用水 盐酸溶液。

    Process for manufacturing bis-silyl ureas
    4.
    发明授权
    Process for manufacturing bis-silyl ureas 失效
    制备双甲硅烷基脲的方法

    公开(公告)号:US06303810B1

    公开(公告)日:2001-10-16

    申请号:US09589121

    申请日:2000-06-08

    IPC分类号: C07F710

    CPC分类号: C07F7/10

    摘要: The invention relates to a process for manufacturing bis-silyl ureas which consists in reacting urea and a disilazane in an aliphatic nitrile and most particularly in acetonitrile. The process of the present invention applies particularly to the manufacture of bis(trimethylsilyl)urea from urea and hexamethyldisilazane.

    摘要翻译: 本发明涉及一种制备双甲硅烷基脲的方法,其包括使脲和二硅氮烷在脂族腈中反应,最特别是在乙腈中。 本发明的方法特别适用于从尿素和六甲基二硅氮烷制备双(三甲基甲硅烷基)脲。

    Method for preparing .alpha.,.omega.-bromochloroalkanes
    5.
    发明授权
    Method for preparing .alpha.,.omega.-bromochloroalkanes 失效
    制备α,ω-溴氯烷烃的方法

    公开(公告)号:US5994600A

    公开(公告)日:1999-11-30

    申请号:US981960

    申请日:1998-04-02

    CPC分类号: C07C17/093

    摘要: To prepare .alpha.,.omega.-bromochloroalkanes, a cyclic ether, to which water has optionally been added, is hydrochlorinated and then the resultant phase is reacted, without any prior purification or separation, with gaseous hydrobromic acid.

    摘要翻译: PCT No.PCT / FR96 / 01027 Sec。 371日期:1998年4月2日 102(e)1998年4月2日PCT 1996年7月2日PCT公布。 公开号WO97 / 03036 日期1997年1月30日为了制备α,ω-溴氯代烷烃,任选加入水的环醚被氢氯化,然后使所得相与气态氢溴酸反应,而无需任何预先的纯化或分离。