Process for producing 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid
    6.
    发明授权
    Process for producing 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid 有权
    制备2,3,5,6-四氯-1,4-苯二甲酸的方法

    公开(公告)号:US06452046B2

    公开(公告)日:2002-09-17

    申请号:US09791323

    申请日:2001-02-22

    IPC分类号: A01N3710

    CPC分类号: C07C51/06 C07C63/30

    摘要: A process for producing 2,3,5,6-tetrachloro-1, 4-benzenedicarboxylic acid, comprising heating 2,3,5,6-tetrachloro-1,4-benzenedicarboxamide together with sulfuric acid exhibiting an acidity function (—Ho) of 10.27 to 14.44 in the presence of water contained in an amount smaller than a stoichiometric value of hydrolysis at 110 to 190° C. This process efficiently produces 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid which is a precursor of dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate useful as a herbicide.

    摘要翻译: 一种制备2,3,5,6-四氯-1,4-苯二甲酸的方法,包括将2,3,5,6-四氯-1,4-苯二甲酰胺与表现出酸度函数(-Ho)的硫酸一起加热, 在含水量小于110至190℃的水解化学计量值的水存在下,为10.27至14.44。该方法有效地产生2,3,5,6-四氯-1,4-苯二甲酸,其为 用作除草剂的2,3,5,6-四氯-1,4-苯二甲酸二甲酯的前体。

    Substituted benzoyl cyclic enone, process for preparation, and herbicide
    7.
    发明授权
    Substituted benzoyl cyclic enone, process for preparation, and herbicide 失效
    取代的苯甲酰环烯酮,制备方法和除草剂

    公开(公告)号:US5525580A

    公开(公告)日:1996-06-11

    申请号:US182895

    申请日:1994-01-14

    摘要: Compounds represented by general formula (I), herbicides or selective herbicides for paddy field containing said compounds as active ingredients, method of controlling growth of undesirable plants by applying the herbicides on places where control is desired. ##STR1## wherein A represents a --S(O)nR.sup.1 in which n is 0 or 2 and R.sup.1 represents a (substituted) lower alkyl; a cycloalkyl; a (substituted) benzyl; a (substituted) phenyl; or a --OR.sup.2 in which R.sup.2 represents a (substituted) phenyl;B represents a halogen, a nitro, a lower alkyl, or a lower alkylsulfonyl;D represents a hydrogen, a lower alkyl, a lower alkoxy, a lower alkoxymethyl, or a lower alkoxycarbonyl;E represents a halogen, a (substituted) lower alkoxy, a lower alkylthio, a (substituted) lower alkylsulfonyl, or a lower alkylsulfonyloxy.The herbicides of the present invention can prevent a wide variety of noxious weeds and further selectively prevent weeds on paddy field with considerably reduced phytotoxicities on rice plant.

    摘要翻译: 由通式(I)表示的化合物,含有所述化合物作为活性成分的稻田的除草剂或选择性除草剂,通过将除草剂施用于需要控制的地方来控制不希望的植物的生长的方法。 (I)其中A表示-S(O)nR1,其中n为0或2,R 1表示(取代的)低级烷基; 环烷基 (取代的)苄基; (取代的)苯基; 或-OR 2,其中R 2表示(取代的)苯基; B表示卤素,硝基,低级烷基或低级烷基磺酰基; D表示氢,低级烷基,低级烷氧基,低级烷氧基甲基或低级烷氧基羰基; E表示卤素,(取代的)低级烷氧基,低级烷硫基,(取代的)低级烷基磺酰基或低级烷基磺酰氧基。 本发明的除草剂可以防止各种各样的有害杂草,并进一步选择性地防止水稻上的杂草,并且在水稻植物上具有显着降低的植物毒性。