Process for the preparation of chlorofluronitrobenzenes and
difluoronitrobenzenes
    48.
    发明授权
    Process for the preparation of chlorofluronitrobenzenes and difluoronitrobenzenes 失效
    氯氟草硝和二氟硝基苯的制备方法

    公开(公告)号:US5545768A

    公开(公告)日:1996-08-13

    申请号:US958107

    申请日:1992-12-22

    CPC classification number: C07C201/12

    Abstract: A process for the preparation of chlorofluoronitrobenzenes and difluoronitrobenzenes, which comprises heating dichloronitrobenzene to not more than 200.degree. C. in excess with an alkali metal fluoride having a total water content of about 0.2 to about 2.5% by weight in the presence of a quaternary ammonium and/or phosphonium salt, crown ether and/or polyethylene glycol dimethyl ether as catalyst in the absence of a solvent.

    Abstract translation: PCT No.PCT / EP92 / 01079 Sec。 371日期1992年12月22日 102(e)日期1992年12月22日PCT Filed 1991年6月8日PCT公布。 公开号WO91 / 00270 日期1992年1月9日一种氯氟硝基苯和二氟硝基苯的制备方法,其包括在二氯硝基苯与总含水量为约0.2至约2.5重量%的碱金属氟化物中将二氯硝基苯过量加热至不超过200℃ 在不存在溶剂的情况下存在季铵和/或鏻盐,冠醚和/或聚乙二醇二甲醚作为催化剂。

    Process for the preparation of 2-nitro-3, 6-dichlorophenol
    49.
    发明授权
    Process for the preparation of 2-nitro-3, 6-dichlorophenol 失效
    2-硝基-3,6-二氯苯酚的制备方法

    公开(公告)号:US5292966A

    公开(公告)日:1994-03-08

    申请号:US33110

    申请日:1993-03-16

    CPC classification number: C07C201/08

    Abstract: 2-Nitro-3,6-dichlorophenol is prepared by sulfonation of 2,5-dichlorophenol and subsequent nitration and desulfonation, in which the nitration is carried out by metering in a nitrating acid composed of 98 to 100% strength nitric acid and 96 to 100% strength sulfuric acid at temperatures from -15.degree. to 35.degree. C. and a metering time of at least 1 hour.

    Abstract translation: 2-硝基-3,6-二氯苯酚是通过2,5-二氯苯酚的磺化和随后的硝化和脱磺酸制备的,其中硝化是通过计量在由98至100%的强度硝酸组成的硝酸中进行的,而96- 在-15度至35摄氏度的温度下,100%强度的硫酸和至少1小时的计量时间。

    Process for producing nitromethane
    50.
    发明授权
    Process for producing nitromethane 失效
    硝基甲烷生产工艺

    公开(公告)号:US4992603A

    公开(公告)日:1991-02-12

    申请号:US363735

    申请日:1989-06-09

    CPC classification number: C07C201/06

    Abstract: Nitromethane is preparaed from a nitriding agent comprising an oxygenated nitrogen compound and a carbon compound containing two carbon atoms and at least one atom other than carbon and hydrogen.

    Abstract translation: 硝基甲烷由包含含氧氮化合物和含有两个碳原子的碳化合物和除碳和氢以外的至少一个原子的氮化剂制备。

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