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19 条记录 (耗时 0.034 秒)

    Process for the preparation of aryl-substituted propionic acid esters
    5.
    发明授权
    Process for the preparation of aryl-substituted propionic acid esters 失效
    制备ARYL取代的丙酸酯的方法

    公开(公告)号：US5089656A

    公开(公告)日：1992-02-18

    申请号：US555225

    申请日：1990-07-18

    申请人： Lin-Chen Yu

    发明人： Lin-Chen Yu

    IPC分类号： B01J23/04 ,  B01J27/24 ,  B01J31/02 ,  C07B61/00 ,  C07C67/347 ,  C07C69/732 ,  C07C69/76

    CPC分类号： C07C67/347

    摘要： Disclosed is a process for the preparation of aryl-substituted propionic acid esters having the formula: ##STR1## wherein R and R.sup.1 are a C.sub.1 -C.sub.12 linear or branched alkyl, a C.sub.5 -C.sub.12 cycloalkyl, a C.sub.6 -C.sub.12 aryl or a C.sub.7 -C.sub.12 alkaryl or aralkyl, R.sup.2 is hydrogen or a C.sub.1 -C.sub.20 linear or branched alkyl and R.sup.3 is a C.sub.1 -C.sub.20 linear or branched alkyl, a C.sub.5 -C.sub.12 cycloalkyl, a C.sub.6 -C.sub.12 aryl or a C.sub.7 -C.sub.20 alkaryl or aralkyl, and may be the same or different, which comprises forming a reaction mixture of a phenol, at least one base catalyst and an acrylate, in the presence of a complexing agent effective in increasing the rate of reaction, wherein (i) substantially all of the side-product is removed from said reaction mixtrue prior to the addition of the complexing agent and (ii) all or substantially all of the acrylate is added at once to the reaction mixture. The process results in higher yields of the desired product, in a shorter period of time, with a reduction of undesirable by-products.

    Preparation of dialkoxybenzoic acid
    6.
    发明授权
    Preparation of dialkoxybenzoic acid 失效
    二烷氧基苯甲酸的制备

    公开(公告)号：US4845276A

    公开(公告)日：1989-07-04

    申请号：US234533

    申请日：1988-08-22

    申请人： Lin-Chen Yu

    发明人： Lin-Chen Yu

    IPC分类号： C07C51/15 ,  C07C65/21

    CPC分类号： C07C51/15

    摘要： 2,6-dialkoxybenzoic acid is made by metalation of 1,3-dialkoxybenzene by reaction with potassium dialkylamide. The metalated dialkoxybenzene is carbonated and acidified to form the dialkoxybenzoic acid.