Preparation of perfluoroalkanecarboxylic acids and novel
perfluoroalkanedichloroethylenes obtained
    5.
    发明授权
    Preparation of perfluoroalkanecarboxylic acids and novel perfluoroalkanedichloroethylenes obtained 失效
    获得全氟烷基二氯乙烯的全氟烷烃羧酸和新型全氟烷二氯乙烯的制备

    公开(公告)号:US4906416A

    公开(公告)日:1990-03-06

    申请号:US699827

    申请日:1985-02-08

    CPC分类号: C07C51/16

    摘要: A process for preparing perfluoroalkanecarboxylic acids, wherein a perfluoroiodoalkane, R.sub.F I, is reacted with trichloroethylene in an acidic solvent in the presence of zinc, and the 2-perfluoroalkyl-1,1-dichloroethylene thus obtained is oxidized with the aid of permanganate, R.sub.F representing a straight chain or branched perfluoro radical containing one to 20 carbon atoms, together with certain novel perfluoroalkyldichloroethylenes having four or more carbon atoms so obtained.

    摘要翻译: 一种制备全氟烷烃羧酸的方法,其中全氟碘代烷烃RFI与三氯乙烯在酸性溶剂中在锌存在下与三氯乙烯反应,所得的2-全氟烷基-1,1-二氯乙烯借助于高锰酸盐被氧化,RF代表 含有1-20个碳原子的直链或支链全氟基团,以及如此获得的具有四个或更多个碳原子的某些新型全氟烷基二氯乙烯。

    Use of isocyanates for assaying nucleophilic functions in the form of traces in wet medium
    7.
    发明授权
    Use of isocyanates for assaying nucleophilic functions in the form of traces in wet medium 失效
    使用异氰酸酯来测定在湿介质中痕量形式的亲核功能

    公开(公告)号:US06534317B1

    公开(公告)日:2003-03-18

    申请号:US09508787

    申请日:2000-05-08

    IPC分类号: G01N3300

    CPC分类号: G01N31/22 Y10T436/172307

    摘要: A method for detecting traces of pollutant in aqueous media, wherein the method includes the use of isocyanates to react on the nucleophilic functions in the form of trace amounts in a wet medium. The method for assaying nulceophilic functions in a wet medium includes the following steps: adding isocyanates to an aqueous solution of basic pH containing the nucleophilic functions to be tested; maintaining the solution for an interval ranging from a few minutes to several dozens of minutes at a temperature lower than 100° C.; and assaying the resulting carbamate, thiocarbamate or urea.

    摘要翻译: 一种用于检测水性介质中痕量污染物的方法,其中所述方法包括使用异氰酸酯以湿介质中痕量形式的亲核功能反应。 用于测定湿培养基中的亲脂性功能的方法包括以下步骤:将异氰酸酯加入含有待测试的亲核功能的碱性pH水溶液中; 在低于100℃的温度下将溶液保持几分钟至数十分钟的间隔; 并测定所得氨基甲酸酯,硫代氨基甲酸酯或尿素。

    Functionalization of iodopolyfuorgalkanes by electrochemical reduction
    9.
    发明授权
    Functionalization of iodopolyfuorgalkanes by electrochemical reduction 失效
    通过电化学还原对碘聚氧烷烃进行功能化

    公开(公告)号:US4830715A

    公开(公告)日:1989-05-16

    申请号:US38188

    申请日:1987-04-14

    CPC分类号: C25B3/04

    摘要: The invention relates to the preparation of functionalized derivatives from iodopolyfluoroalkanes by electrochemical reduction. This reduction is carried out in a formamide or substituted formamide solvent which may contain up to 70% (by volume) water, on a carbon cathode; for certain embodiments sulfur dioxide may also be present. This method of preparing perfluoroalkanecarboxylic acids R.sub.F COOH or perfluoroalkanesulphinic acids, R.sub.F SO.sub.2 H and alcohols of the R.sub.F C.sub.2 H.sub.4 OH type, also makes it possible to prepare new fluorinated compounds of formulae: I--(CF.sub.2).sub.p-1 --COOH and HO.sub.2 S--(CF.sub.2).sub.p-1 --COOH, in which p is an even-numbered integer which may range from 4 to 12.

    摘要翻译: 本发明涉及通过电化学还原从碘代聚氟烷烃制备官能化衍生物。 该还原在碳阴极上可以含有高达70%(体积)水的甲酰胺或取代甲酰胺溶剂进行; 对于某些实施方案,也可以存在二氧化硫。 制备全氟烷烃羧酸RFCOOH或全氟烷基亚磺酸,RFSO2H和RFC2H4OH型醇的方法也可以制备新的氟化式化合物:I-(CF 2)p-1-COOH和HO 2 S-(CF 2)p-1 -COOH,其中p是可以在4-12之间的偶数整数。