Polycarboxylic acid mixture
    91.
    发明授权
    Polycarboxylic acid mixture 失效
    多元羧酸混合物

    公开(公告)号:US07262256B2

    公开(公告)日:2007-08-28

    申请号:US10497966

    申请日:2002-12-27

    CPC分类号: C09D163/00 C08G59/4207

    摘要: A polycarboxylic acid mixture comprising 80% by weight or more of 1,3,6-hexanetricarboxylic acid, wherein the polycarboxylic acid mixture has a psychometric lightness L-value of 98 or more, a psychometric chroma a-value of from −2.0 to 2.0 and a psychometric chroma b-value of from −2.0 to 3.0, and has a nitrogen content of 5,000 ppm by weight or less.

    摘要翻译: 包含80重量%以上的1,3,6-己烷三羧酸的多元羧酸混合物,其中所述多元羧酸混合物的心理亮度L值为98以上,心理测色色度a值为-2.0〜2.0 和心理测色色度b值为-2.0〜3.0,氮含量为5,000重量ppm以下。

    Processes for producing .alpha.-cyanohydrin esters and .alpha.-hydroxy
acids
    94.
    发明授权
    Processes for producing .alpha.-cyanohydrin esters and .alpha.-hydroxy acids 失效
    生产α-氰基丙酸酯和α-羟基酸的方法

    公开(公告)号:US6111128A

    公开(公告)日:2000-08-29

    申请号:US213424

    申请日:1998-12-17

    CPC分类号: C07C253/00 C07C51/08

    摘要: In the presence of a metal catalyst such as a samarium compound, an enol ester compound shown by the formula (1) is reacted with a carbonyl compound shown by the formula (3) and a cyanogenation agent to produce an .alpha.-cyanohydrin ester shown by the formula (4): ##STR1## wherein R.sup.1, R.sup.7, and R.sup.8 are the same or different from each other, each representing a non-reactive atom or a non-reactive organic group; R.sup.2, R.sup.3, and R.sup.4 are the same or different from each other, each representing a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.By hydrolyzing the obtained compound, the corresponding .alpha.-hydroxy acid or a salt thereof can be obtained. According to the above processes, an .alpha.-cyanohydrin ester and an .alpha.-hydroxy acid can be obtained in high yields.

    摘要翻译: 在诸如钐化合物的金属催化剂存在下,将式(1)所示的烯醇酯化合物与式(3)所示的羰基化合物和氰化剂反应,生成α-氰基氢酯,由 式(4):其中R 1,R 7和R 8彼此相同或不同,各自表示非反应性原子或非反应性有机基团; R 2,R 3和R 4相同或不同,各自表示氢原子或碳原子数1〜5的烷基。 通过水解所得化合物,可以得到相应的α-羟基酸或其盐。 根据上述方法,可以高产率获得α-氰基氢酯和α-羟基酸。