Process for the preparation of fluorinated nitroalkanes
    2.
    发明授权
    Process for the preparation of fluorinated nitroalkanes 失效
    制备氟化硝基烷烃的方法

    公开(公告)号:US4518812A

    公开(公告)日:1985-05-21

    申请号:US575636

    申请日:1984-01-31

    CPC分类号: C07C201/14 C07C205/08

    摘要: In the conjugated nitrofluorination of an olefin by reacting an olefin of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently is hydrogen, fluorine, chlorine, bromine, alkyl, halogenoalkyl or cycloalkyl, orR.sup.2 and R.sup.4 together are an alkylene radical of 3 to 6 carbon atoms,with hydrogen fluoride and nitric acid to produce an .alpha.-fluorinated nitroalkane of the formula ##STR2## the improvement which comprises effecting the reaction in a vessel protected against corrosion employing about 1 to 1.1 mols of hydrogen fluoride and about 1 to 2 mols of nitric acid per mol of olefin. The process uses much less HF than heretofore and the products are useful intermediates in making herbicides. Some of the products are new.

    摘要翻译: 在烯烃的共轭硝基氟化中,通过使式(IMAGE)的烯烃反应,其中R 1,R 2,R 3和R 4各自独立地是氢,氟,氯,溴,烷基,卤代烷基或环烷基,或者R 2和R 4一起是 具有3至6个碳原子的亚烷基,与氟化氢和硝酸反应以产生下式的α-氟化的硝基烷烃:其中包括在使用约1至1.1摩尔氟化氢的保护反应的容器中进行反应 和约1至2摩尔硝酸/摩尔烯烃。 该方法使用比迄今为止少得多的HF,并且该产品是制备除草剂的有用中间体。 一些产品是新的。

    Preparation of fluorinated nitroalkanes
    3.
    发明授权
    Preparation of fluorinated nitroalkanes 失效
    氟化硝基烷烃的制备

    公开(公告)号:US4533776A

    公开(公告)日:1985-08-06

    申请号:US575649

    申请日:1984-02-01

    摘要: In the preparation of an .alpha.-fluorinated nitroalkane of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and individually represent hydrogen, fluorine, chlorine, bromine, alkyl, halogenoalkyl or cycloalkyl, orR.sup.1 and R.sup.3 have the meaning indicated andR.sup.2 and R.sup.4 together represent an alkylene group having 3-6 carbon atoms,by conjugated nitrofluorination of the corresponding olefin of the formula ##STR2## the improvement which comprises employing about 1.1 mols of hydrogen fluoride and 1 to 2 mols of nitric acid per mol of olefin and carrying out the reaction in the presence of an agent which binds water, e.g. chlorosulphonic acid, fluorosulphonic acid, sulphur trioxide, sulphur dioxide, thionyl chloride, thionyl fluoride, sulfuryl chloride or sulfuryl fluoride. The end products, some of which are known, are useful as intermediates in synthesizing herbicides.

    摘要翻译: 在制备其中R 1,R 2,R 3和R 4相同或不同并且各自表示氢,氟,氯,溴,烷基,卤代烷基或环烷基的式(Ia)的α-氟化硝基烷烃或R1和R3具有 所表示的含义,R2和R4一起表示具有3-6个碳原子的亚烷基,通过共轭硝基氟化相应的式“烯烃”烯烃,其改进包括使用约1.1摩尔氟化氢和1至2摩尔硝酸 酸/每摩尔烯烃,并在结合水的试剂存在下进行反应,例如 氯磺酸,氟磺酸,三氧化硫,二氧化硫,亚硫酰氯,亚硫酰氟,磺酰氯或硫酰氟。 其中一些已知的最终产物可用作合成除草剂的中间体。

    Preparation of 3-bromo-4-fluorotoluene
    4.
    发明授权
    Preparation of 3-bromo-4-fluorotoluene 失效
    3-溴-4-氟甲苯的制备

    公开(公告)号:US4351974A

    公开(公告)日:1982-09-28

    申请号:US233413

    申请日:1981-02-11

    CPC分类号: C07C17/12

    摘要: In the preparation of 3-bromo-4-fluorotoluene by reacting 4-fluorotoluene with bromine, the improvement which comprises effecting the bromination in glacial acetic acid in the presence of iodine and iron or an iron salt. As a result the proportion of 3-bromo-4-fluorotoluene relative to its 2-bromo-4-fluorotoluene isomer is markedly increased.

    摘要翻译: 在通过4-氟甲苯与溴反应制备3-溴-4-氟甲苯的过程中,其改进包括在碘和铁或铁盐存在下在冰醋酸中进行溴化。 结果,3-溴-4-氟甲苯相对于其2-溴-4-氟甲苯异构体的比例明显增加。

    Process for the preparation of 5-fluorocytosine
    6.
    发明授权
    Process for the preparation of 5-fluorocytosine 失效
    5-氟胞嘧啶的制备方法

    公开(公告)号:US4703121A

    公开(公告)日:1987-10-27

    申请号:US790585

    申请日:1985-10-23

    CPC分类号: C07D239/47

    摘要: 5-fluorocytosine is prepared by reacting 2,5-difluoro-4-chloro-pyrimidine with a proton acid in the presence of water to yield 2-hydroxy-4-chloro-5-fluoropyrimidine and reacting the 2-hydroxy-4-chloro-5-fluoropyrimidine with ammonia to yield 5-fluoro-cytosine.

    摘要翻译: 5-氟胞嘧啶是通过使2,5-二氟-4-氯 - 嘧啶与质子酸在水存在下反应,得到2-羟基-4-氯-5-氟嘧啶,并使2-羟基-4-氯 -5-氟嘧啶与氨反应,得到5-氟 - 胞嘧啶。