Method for the asymmetric hydrogenation of olefins utilising photoisomerisation
    8.
    发明公开
    Method for the asymmetric hydrogenation of olefins utilising photoisomerisation 审中-公开
    Verfahren zur不对称的Hydrierung von Olefinen unter Einsatz von Photoisomerisierung

    公开(公告)号:EP2213638A1

    公开(公告)日:2010-08-04

    申请号:EP09151892.8

    申请日:2009-02-02

    IPC分类号: C07B53/00 C07C231/16

    CPC分类号: C07C231/18 C07C233/31

    摘要: The present invention relates to a method for the preparation of a compound of formula (I),

    wherein R 1 is different to R 2 ; R 3 is different to R 4 ; and R 1 , R 2 , R 3 and R 4 are each a moiety other than hydrogen, which method comprises,
    i) photoirradiating at an intensity above ambient intensity a solution comprising a compound of formula (II),

    wherein R 1 , R 2 , R 3 and R 4 are as defined above, to form a solution of a mixture of compounds of formula (IIa) and (IIb),

    wherein R 1 , R 2 , R 3 and R 4 are as defined above; and
    ii) contacting the mixture of compounds (IIa) and (IIb) with a hydrogen donating agent in the presence of an asymmetric hydrogenation catalyst, after initiation of i) and before termination of i).

    摘要翻译: 本发明涉及制备式(I)化合物的方法,其中R 1不同于R 2; R 3与R 4不同; 并且R 1,R 2,R 3和R 4各自是不同于氢的部分,该方法包括:i)以强度高于环境强度的光照射包含式(II)化合物的溶液,其中R 1,R 2 ,R 3和R 4如上所定义,以形成式(IIa)和(IIb)化合物的混合物的溶液,其中R 1,R 2,R 3和R 4如上所定义; 和ii)在i)和i)终止之后,在不对称氢化催化剂存在下,使化合物(IIa)和(IIb)的混合物与供氢剂接触。

    IMPROVED PROCESS FOR WORKING UP DIACETONE ACRYLAMIDE SOLUTIONS FOR THE PREPARATION OF PURE DIACETONE ACRYLAMIDE
    9.
    发明公开
    IMPROVED PROCESS FOR WORKING UP DIACETONE ACRYLAMIDE SOLUTIONS FOR THE PREPARATION OF PURE DIACETONE ACRYLAMIDE 审中-公开
    改进方法,治疗双丙酮丙烯酰胺的解决方案对于纯丙酮丙烯酰胺生产

    公开(公告)号:EP2144869A1

    公开(公告)日:2010-01-20

    申请号:EP08759469.3

    申请日:2008-05-08

    IPC分类号: C07C231/24 C07C233/31

    摘要: Improved process for working up diacetone acrylamide solutions, obtained by reaction of acetone or diacetone alcohol with acrylonitrile and sulfuric acid and subsequent dilution and neutralization, in which a) the organic phase obtained subsequent to the neutralization, which comprises the crude diacetone acrylamide, is hydrolyzed by addition of an aqueous alkaline solution in order to remove acrylamide, then b) after phase separation has been carried out, the organic phase, which comprises the crude diacetone acrylamide, is neutralized by addition of an acid, and c) in succession, low-boiling-point byproducts are removed by distillation in the presence of one or more polymerization inhibitors, then t-butylacrylamide is removed by distillation and, finally, the diacetone acrylamide is isolated by product distillation, and d) the diacetone acrylamide thus obtained is converted into its final form.