Process for preparing trans-.beta.-benzoylacrylic acid ester
    8.
    发明授权
    Process for preparing trans-.beta.-benzoylacrylic acid ester 失效
    反式β-苯甲酰丙烯酸酯的制备方法

    公开(公告)号:US4994600A

    公开(公告)日:1991-02-19

    申请号:US869782

    申请日:1986-06-02

    CPC分类号: C07C67/327

    摘要: A process for preparing trans-.beta.-benzoylacrylic acid ester having the general formula (I): ##STR1## wherein R is alkyl group or aralkyl group, which comprises dealcoholizing .beta.-benzoyl-.alpha.-alkoxypropionic acid ester having the general formula (II): ##STR2## wherein R is above, in the presence of an acid catalyst to give trans-.beta.-benzoylacrylic acid ester having the general formula (I).According to the process of the present invention, the by-product (II) produced in the esterification reaction of .beta.-benzoylacrylic acid (III) with the alcohol (V) by the dehydration reaction can be converted into the compound (I) by the dealcoholization reaction in the presence of the acid catalyst and thus trans-.beta.-benzoylacrylic acid ester (I) with a high purity can be produced in an industrially advantageous manner.

    摘要翻译: 制备具有通式(I)的反式-β-苯甲酰基丙烯酸酯的方法:其中R是烷基或芳烷基,其包括使具有通式(I)的β-苯甲酰基-α-烷氧基丙酸酯脱醇 (II):其中R在上面,在酸催化剂存在下,得到具有通式(I)的反式-β-苯甲酰基丙烯酸酯。 根据本发明的方法,通过脱水反应在β-苯甲酰基丙烯酸(III)与醇(V)的酯化反应中产生的副产物(II)可以通过 在酸催化剂存在下脱醇反应,从而可以以工业上有利的方式生产具有高纯度的反式-β-苯甲酰基丙烯酸酯(I)。

    Permanent waving compositions
    9.
    发明授权
    Permanent waving compositions 失效
    永久性挥发性成分

    公开(公告)号:US4272517A

    公开(公告)日:1981-06-09

    申请号:US40969

    申请日:1979-05-21

    CPC分类号: A61Q5/04 A61K8/447

    摘要: A permanent waving composition which comprises N-carbamoylcysteine and which acts mildly on the human hair and skin and has outstanding stability during application and storage. When further incorporating cysteine, the composition posseses the advantages afforded by cysteine without involving the drawbacks attendant on the use of cysteine.

    摘要翻译: 一种永久挥发性组合物,其包含N-氨基甲酰基半胱氨酸,并且其在人的头发和皮肤上轻微作用,并且在施用和储存期间具有优异的稳定性。 当进一步掺入半胱氨酸时,该组合物具有由半胱氨酸提供的优点,而不涉及半胱氨酸的使用所引起的缺点。