Process for the preparation of arylglyoxylic acids
    21.
    发明授权
    Process for the preparation of arylglyoxylic acids 失效
    芳基乙醛酸的制备方法

    公开(公告)号:US4218380A

    公开(公告)日:1980-08-19

    申请号:US38154

    申请日:1979-05-11

    CPC分类号: C07C51/373 C07D317/60

    摘要: Novel process for the preparation of an arylglyoxylic acid compound, e.g., phenylglyoxylic acid, which comprises oxidizing an .alpha.-hydroxyarylacetic acid, e.g., mandelic acid, of the formula ##STR1## in which m is 1, 2 or 3,each R individually is hydrogen, alkyl, cycloalkyl,aryl, aralkyl, alkoxy, cycloakoxy, aryloxy, hydroxyl,halogen, aminoalkyl or carboxyl,with the proviso thattwo R's together can represent the methylenedioxygroup or a fused-on, optionally heterocyclic andoptionally substituted ring,with oxygen or a gas containing molecular oxygen in aqueous alkaline medium in the presence of a catalyst comprising a platinum-group metal in the presence as an activator of at least one of lead, a lead compound, bismuth and a bismuth compound at a temperature of up to the boiling point of the resulting reaction mixture.

    摘要翻译: 用于制备芳基乙醛酸化合物(例如苯基乙醛酸)的新方法,其包括将下式(I)的α-羟基芳基乙酸(例如扁桃酸)氧化为其中m为1,2或3,其中m为1,2或3 R单独为氢,烷基,环烷基,芳基,芳烷基,烷氧基,环烷氧基,芳氧基,羟基,卤素,氨基烷基或羧基,条件是两个R一起可以代表亚甲二氧基或稠合,任选杂环和任选取代 在作为铅,铅化合物,铋和铋化合物中的至少一种的活化剂的存在下,在包含铂族金属的催化剂存在下,在含水碱性介质中,用氧气或含有分子氧的气体, 温度达到所得反应混合物的沸点。

    Process for preparing meta-substituted halophenols
    22.
    发明授权
    Process for preparing meta-substituted halophenols 失效
    制备间位取代的卤代酚的方法

    公开(公告)号:US4060562A

    公开(公告)日:1977-11-29

    申请号:US609140

    申请日:1975-08-29

    CPC分类号: C07C37/00 Y02P20/52

    摘要: Phenols, meta-substituted by halogen are prepared by reacting halogenophenols of the formula ##STR1## wherein X.sup.1 and X.sup.2 are identical or different and represent halogen, hydrogen or optionally substituted aryl or aralkyl, with at least one of the radicals X.sup.1 orX.sup.2 representing halogen, andR.sup.1, r.sup.2 and R.sup.3 are identical or different and represent hydrogen or optionally monosubstituted or polysubstituted aryl or aralkyl or chlorine, bromine or iodine, with at least one of the radicals R.sup.1, R.sup.2 and R.sup.3 representing chlorine, bromine or iodine,With hydrogen under pressure at elevated temperature in the presence of elemental sulfur, or compounds thereof optionally in the presence of active charcoal and/or iron salts.

    摘要翻译: 由卤素间隔取代的苯酚通过使式(ⅩⅩⅥ)的卤代苯酚与X1和X2中的至少一个表示卤素反应来制备,其中X 1和X 2相同或不同并且表示卤素,氢或任选取代的芳基或芳烷基 并且R 1,R 2和R 3相同或不同,表示氢或任选的单取代或多取代的芳基或芳烷基或氯,溴或碘,基团R 1,R 2和R 3中的至少一个表示氯,溴或碘,与氢 在存在活性炭和/或铁矿盐的情况下,在高温下的压力下,可能有选择地存在的元素硫或其化合物。

    Process for the preparation of 4-amino-diphenylamines
    27.
    发明授权
    Process for the preparation of 4-amino-diphenylamines 失效
    制备4-氨基 - 二苯胺的方法

    公开(公告)号:US4326080A

    公开(公告)日:1982-04-20

    申请号:US158540

    申请日:1980-06-11

    CPC分类号: C07C209/18

    摘要: A process for the preparation of a 4-aminodiphenyl amino derivative which comprises:(a) contacting a hydroxybenzene of the formula ##STR1## wherein R is hydroxyl or amino with an aniline compound of the formula ##STR2## wherein R.sub.1 represents hydrogen or an alkyl radical in the presence of a .gamma.-aluminum oxide containing catalyst; and(b) contacting the product from step (a) with ammonia in the presence of the same .gamma.-aluminum oxide containing catalyst used in step (a).

    摘要翻译: 一种制备4-氨基二苯基氨基衍生物的方法,其包括:(a)使式IMA图的羟基苯与式Ia的苯胺化合物接触,其中R是羟基或氨基,其中R1代表氢或烷基 在含有γ-氧化铝的催化剂的存在下自由基; 和(b)在步骤(a)中使用的相同的含γ-氧化铝的催化剂的存在下,使来自步骤(a)的产物与氨接触。

    Process for the preparation of arylglyoxylic acids
    29.
    发明授权
    Process for the preparation of arylglyoxylic acids 失效
    芳基乙醛酸的制备方法

    公开(公告)号:US4221719A

    公开(公告)日:1980-09-09

    申请号:US62846

    申请日:1979-08-01

    CPC分类号: C07C51/235 C07C51/255

    摘要: Process for the preparation of an arylglyoxylic acid of the formula Ar--CO--COOH, wherein Ar is optionally substituted aryl, which process comprises oxidizing the corresponding arylethane-1,2-diol of the formula ##STR1## with oxygen or a gas containing molecular oxygen, in an aqueous alkaline medium and in the presence of a platinum-group metal catalyst and, as an activator, a material selected from lead, lead compounds, bismuth and bismuth compounds, at a temperature of up to the boiling point of the reaction mixture; e.g. phenylglyoxylic acid is produced from phenylethane-1,2-glycol preferably using platinum activated with lead, bismuth, or compounds thereof.

    摘要翻译: 制备式Ar-CO-COOH的芳基乙醛酸的方法,其中Ar是任选取代的芳基,该方法包括用式(I)氧化相应的式(I)的芳基乙烷-1,2-二醇与氧或 含有分子氧的气体,在含水碱性介质中,在铂族金属催化剂存在下,作为活化剂,选自铅,铅化合物,铋和铋化合物的材料,在最高沸点 点反应混合物; 例如 优选使用由铅,铋或其化合物活化的铂,由苯乙烷-1,2-二醇制备苯基乙醛酸。