Process for the preparation of aldehydes
    82.
    发明授权
    Process for the preparation of aldehydes 失效
    醛的制备方法

    公开(公告)号:US5059716A

    公开(公告)日:1991-10-22

    申请号:US564226

    申请日:1990-08-08

    CPC classification number: C07C45/41

    Abstract: Aromatic and aliphatic aldehydes can be prepared from the corresponding aromatic or aliphatic carboxylic acids or the esters, anhydrides or halides thereof at elevated temperature by catalytic gas phase hydrogenation using hydrogen if use is made of a catalyst system composed of oxides of titanium and/or vanadium and of one or more co-metals, the co-metals being selected from the group consisting of chromium, molybdenum, cobalt, nickel, zinc, cadmium and copper.

    Abstract translation: 如果使用由钛和/或钒的氧化物组成的催化剂体系,则可以通过使用氢气的催化气相氢化由相应的芳族或脂族羧酸或其酯,酸酐或卤化物在升高的温度下制备芳族和脂族醛 和一种或多种共金属,所述共金属选自铬,钼,钴,镍,锌,镉和铜。

    Process for the removal of m-chlorotoluene from chlorotoluene mixtures
    83.
    发明授权
    Process for the removal of m-chlorotoluene from chlorotoluene mixtures 失效
    从氯甲苯混合物中除去间氯甲苯的方法

    公开(公告)号:US4827058A

    公开(公告)日:1989-05-02

    申请号:US166590

    申请日:1988-03-10

    CPC classification number: C07C17/395

    Abstract: m-Chlorotoluene is removed from chlorotoluene mixtures with a content of up to 10% by weight of m-chlorotoluene, with reference to the total amount of chlorotoluene in the mixture, by chlorinating a substantially toluene-free chlorotoluene mixture in the presence of a Friedel-Crafts catalyst and if appropriate a co-catalyst at from 0.degree. C. up to the boiling point of the mixture, until the content of m-chlorotoluene has decreased to a value of

    Abstract translation: 通过在Friedel的存在下氯化基本上不含甲苯的氯甲苯混合物,从氯甲苯混合物中除去氯甲苯混合物的含量高达10重量%的间氯甲苯,参考混合物中氯甲苯的总量 在0℃至混合物的沸点的情况下,将催化剂和合适的助催化剂反应,直到氯甲苯的含量在氯甲苯混合物中降至1.0重量%以下。

    Process for the preparation of aryloxyacetic acid
    84.
    发明授权
    Process for the preparation of aryloxyacetic acid 失效
    制备芳氧基乙酸的方法

    公开(公告)号:US4238625A

    公开(公告)日:1980-12-09

    申请号:US092783

    申请日:1979-11-08

    CPC classification number: C07C51/255 C07C51/235

    Abstract: In a process for the preparation of an aryloxyacetic acid by oxidation of aryloxyethanol of the formula ##STR1## wherein m represents 1 or 2,n represents the numeral which results from the difference (6-m) andR either individually or independently of one another represent hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, hydroxyl, halogen, alkylcarbonyl, arylcarbonyl, carboxyl or nitro, or represent a benzene ring or cycloalkane ring fused to the phenyl ring,with oxygen or an oxygen-containing gas in an aqueous alkaline medium at a temperature from 0.degree. C. to the boiling point of the reaction mixture in the presence of platinum metals and/or palladium metals containing catalyst, the improvement which comprises carrying out the oxidation in the additional presence of an activator of lead and/or bismuth and/or a compound thereof and optionally in the additional presence of Cadmium and/or its compounds.

    Abstract translation: 在通过氧化式(I)的芳氧基乙醇制备芳氧基乙酸的方法中,其中m表示1或2,n表示由差异(6-m)和R单独或独立地产生的数字 代表氢,烷基,环烷基,芳基,芳烷基,烷氧基,环烷氧基,芳氧基,羟基,卤素,烷基羰基,芳基羰基,羧基或硝基,或代表与苯环稠合的苯环或环烷烃环, 含氧气体在含水碱性介质中,在铂金属和/或含钯金属的催化剂存在下,在0℃至该反应混合物的沸点的温度下,其改进包括在额外的 铅和/或铋和/或其化合物的活化剂的存在,并且任选地在镉和/或其化合物的另外存在下。

    Process for the preparation of arylglyoxylic acids
    85.
    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 classification number: C07C51/373 C07D317/60

    Abstract: 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.

    Abstract translation: 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。

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