Conversion of picrate to picric acid in a liquid-liquid two phase system
    132.
    发明授权
    Conversion of picrate to picric acid in a liquid-liquid two phase system 有权
    在液 - 液两相系统中苦味酸转化为苦酸

    公开(公告)号:US05998676A

    公开(公告)日:1999-12-07

    申请号:US149938

    申请日:1998-09-09

    CPC classification number: C07C201/16 C07C201/12

    Abstract: A process for the conversion of a picrate salt, preferably ammonium pricrate, to picric acid by acidifying the picrate salt in a two phase liquid system. One phase is an aqueous phase which contains an acid which is effective for acidifying ammonium picrate to picric acid and the other phase is an organic solvent phase in which the picric acid is soluble.

    Abstract translation: 通过将苦味酸盐在两相液体体系中酸化而将苦味酸盐,优选铵盐转化成苦味酸的方法。 一相是含有酸的方法,该酸可有效酸化苦味酸铵至苦味酸,另一相为苦味酸可溶的有机溶剂相。

    Process for preparing trifluralin
    136.
    发明授权
    Process for preparing trifluralin 失效
    制备氟乐灵的方法

    公开(公告)号:US5728881A

    公开(公告)日:1998-03-17

    申请号:US810883

    申请日:1997-03-05

    CPC classification number: C07C209/10 C07C201/12 Y02P20/582

    Abstract: A process is provided for preparing 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine from 4-chlorotrifluoromethylbenzene. The process includes a two stage nitration and an amination step. Ethylene dichloride is utilized as a diluent and solvent in the nitration steps. Spent acid from the first nitration is reconstituted with sulfur trioxide for use in the second nitration. Spent acid from the second nitration is used directly in the first nitration and evaporation is used to remove nitrosoamines from the final trifluralin product.

    Abstract translation: 提供了从4-氯三氟甲基苯制备2,6-二硝基-N,N-二丙基-4-(三氟甲基)苯胺的方法。 该方法包括两步硝化和胺化步骤。 二氯化乙烯在硝化步骤中用作稀释剂和溶剂。 来自第一次硝化的废酸用三氧化硫重新配制用于第二次硝化。 来自第二硝化的废酸直接用于第一硝化,蒸发用于从最终的氟乐灵产物中除去亚硝基胺。

    Process for the preparation of nitrobenzene derivatives
    137.
    发明授权
    Process for the preparation of nitrobenzene derivatives 失效
    硝基苯衍生物的制备方法

    公开(公告)号:US5719317A

    公开(公告)日:1998-02-17

    申请号:US809778

    申请日:1997-03-28

    Applicant: Franco Manfre

    Inventor: Franco Manfre

    CPC classification number: C07C201/12

    Abstract: A method for preparing a compound of formula (I), wherein R.sub.1 and R.sub.2, which are the same or different, are a hydrogen atom or an alkyl or alkoxy radical, or R.sub.1 and R.sub.2, taken together with the carbon atom to which they are attached, form a cycloalkyl radical containing 3-6 carbon atoms. The method comprises dehalogenating a derivative of formula (lI), wherein R.sub.1 and R.sub.2 have the same meanings as in formula (1) and Hal is a chlorine or bromine atom, using 1-2 mol of triethylammonium formate, in the presence of 0.002-0.1 mol of coal-borne palladium per mol of the compound of formula (II), in aceonitrile or tetrahydrofuran and at a temperature between 50.degree. C. and the boiling point of the reaction medium. ##STR1##

    Abstract translation: PCT No.PCT / FR95 / 01241 Sec。 371日期1997年3月28日 102(e)1997年3月28日PCT PCT 1995年9月27日PCT公布。 出版物WO96 / 日期:1996年4月4日制备式(I)化合物的方法,其中R1和R2相同或不同,为氢原子或烷基或烷氧基,或R1和R2与碳一起 它们所连接的原子形成含有3-6个碳原子的环烷基。 该方法包括使式(I)的衍生物脱卤,其中R1和R2具有与式(1)中相同的含义,Hal是氯或溴原子,使用1-2摩尔的三乙基铵甲酸酯,在0.002- 每摩尔式(II)化合物,在乙腈或四氢呋喃中,在50℃和反应介质的沸点之间的温度下,0.1摩尔的煤炭钯。 (I)(II)

    Process for preparing fluoronitrobenzenes
    140.
    发明授权
    Process for preparing fluoronitrobenzenes 失效
    制备氟硝基苯的方法

    公开(公告)号:US5476976A

    公开(公告)日:1995-12-19

    申请号:US277475

    申请日:1994-07-19

    CPC classification number: C07C201/12

    Abstract: Fluoronitrobenzenes are prepared in an advantageous way from the corresponding chloronitrobenzenes and an alkali metal fluoride by means of a chlorine-fluorine exchange reaction with replacement of a chlorine atom by a fluorine atom, by catalyzing the reaction with a quaternaryammonium compound which comprises at least one alkoxypolyoxyalkyl radical.

    Abstract translation: 通过与含有至少一个烷氧基聚氧基烷基的季铵化合物的反应,通过与氟原子取代氯原子进行氯 - 氟交换反应,由相应的氯硝基苯和碱金属氟化物以有利的方式制备氟硝基苯 激进。

Patent Agency Ranking