Removal of impurities from 3-(2′-acetoxyethyl)-dihydro-2(3H)furanone
    2.
    发明授权
    Removal of impurities from 3-(2′-acetoxyethyl)-dihydro-2(3H)furanone 有权
    从3-(2'-乙酰氧基乙基) - 二氢-2(3H)呋喃酮除去杂质

    公开(公告)号:US06488818B1

    公开(公告)日:2002-12-03

    申请号:US09391338

    申请日:1999-09-08

    IPC分类号: B01D300

    CPC分类号: C07D307/33 Y10S203/20

    摘要: A process for removing impurities from 3-(2′-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2′-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially prepared in a manner known per se by acetylation of 3-(2′-hydroxyethyl)dihydro-2(3H)furanone and the resulting product is subsequently subjected to a distillation or rectification, includes carrying out the distillation or rectification in a plurality of steps, where high-boiling impurities are removed in a first step, the product which is drawn off via the top is subsequently subjected to at least one further step in which low-boilers and intermediate boilers are drawn off via the top and the desired pure I is obtained as bottom product.

    摘要翻译: 从3-(2'-乙酰氧基乙基)二氢-2(3H)呋喃酮(I)中除去杂质的方法,其中最初制备含有不需要的杂质的3-(2'-乙酰氧基乙基)二氢-2(3H) 本身已知通过3-(2'-羟乙基)二氢-2(3H)呋喃酮的乙酰化已知的方法,然后将所得产物进行蒸馏或精馏,包括以多个步骤进行蒸馏或精馏,其中 在第一步骤中除去高沸点杂质,然后将经由顶部排出的产物经受至少一个另外的步骤,其中通过顶部抽出低沸点锅炉和中间锅炉,并获得所需的纯I 作为底部产品。

    Preparation of alkyl anthranilates
    4.
    发明授权
    Preparation of alkyl anthranilates 失效
    邻氨基苯甲酸烷基酯的制备

    公开(公告)号:US4310677A

    公开(公告)日:1982-01-12

    申请号:US217453

    申请日:1980-12-17

    CPC分类号: C07C227/22

    摘要: Alkyl anthranilates are prepared by reacting an isatin with an alkanol and hydrogen peroxide in the presence of an alkali metal alkanolate.The alkyl anthranilates obtainable by the process of the invention are valuable starting materials for the preparation of pesticides, dyes and drugs.

    摘要翻译: 烷基邻氨基苯甲酸酯通过在碱金属链烷醇酯存在下使靛红与链烷醇和过氧化氢反应来制备。 通过本发明方法可获得的烷基邻氨基苯甲酸酯是制备农药,染料和药物的有价值的原料。

    Preparation of isatoic anhydrides
    8.
    发明授权
    Preparation of isatoic anhydrides 失效
    盐酸酐的制备

    公开(公告)号:US4316020A

    公开(公告)日:1982-02-16

    申请号:US155761

    申请日:1980-06-02

    IPC分类号: C07D265/26

    CPC分类号: C07D265/26

    摘要: A process for the preparation of isatoic anhydrides of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is hydrogen, alkyl, alkoxy, halogen, nitro, haloalkyl or haloalkoxy, by reacting an isatin of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the stated meanings, with hydrogen peroxide in an acid medium.

    摘要翻译: 其中R 1,R 2,R 3和R 4相同或不同,并且各自为氢,烷基,烷氧基,卤素,硝基,卤代烷基或卤代烷氧基的式IMA图式的酸酐的方法是使式 其中R1,R2,R3和R4具有所述含义,在酸性介质中与过氧化氢反应。

    Process for the preparation of &agr;-chloromethylene-triorganylphosphorane derivatives
    9.
    发明授权
    Process for the preparation of &agr;-chloromethylene-triorganylphosphorane derivatives 失效
    制备α-氯亚甲基 - 三有机基磷烷衍生物的方法

    公开(公告)号:US06211397B1

    公开(公告)日:2001-04-03

    申请号:US08199286

    申请日:1994-03-02

    IPC分类号: C07B3900

    CPC分类号: C07F9/5352

    摘要: A process for the preparation of &agr;-chloromethylene-triorganylphosphorane derivatives I (radicals R are C-organic substituents and A stands for CN or CO-B where B is a C-organic or O-organic radical which is inert under chlorination conditions) by chlorination of phosphoranes II with chlorine, wherein the chlorination is carried out in the presence of a mineral base as hydrogen chloride acceptor and the chlorine and base are fed to the reaction mixture concurrently but separately at the rates at which they are consumed. The reaction products I are important intermediates for plant protectants.

    摘要翻译: 制备α-氯亚甲基 - 三有机基磷烷衍生物I(自由基R是<有机取代基)的方法,A代表 CN CO - B,其中B是在氯化条件下为惰性的 - 有机或 O - 有机基团),其中氯化在存在下进行, 的矿物碱作为氯化氢受体,氯和碱同时进料到反应混合物中,但分别以它们被消耗的速率进料。反应产物I是植物保护剂的重要中间体。