Process for producing 2,3-difluoro-6-nitrophenol
    92.
    发明授权
    Process for producing 2,3-difluoro-6-nitrophenol 失效
    2,3-二氟-6-硝基苯酚的制备方法

    公开(公告)号:US5292967A

    公开(公告)日:1994-03-08

    申请号:US35719

    申请日:1993-03-23

    CPC classification number: C07C201/12

    Abstract: According to a process for producing isomer-free 2,3-difluoro-6-nitrophenol, 2,3,4-trifluoronitrobenzene is reacted with an aqueous solution of alkali metal or alkaline earth metal hydroxide in the absence of organic solvent, at temperatures between about 20.degree. C. and 100.degree. C., the pH value of the reaction mixture is set at about 1 to 6 by acid addition, the resulting product is stream distilled and the 2,3-difluoro-6-nitrophenol is isolated after cooling. No organic solvents are used during any of the steps of the process.

    Abstract translation: PCT No.PCT / EP91 / 01829 Sec。 371日期1993年3月23日 102(e)日期1993年3月23日PCT 1991年9月25日PCT公布。 出版物WO92 / 05141 日期:1992年4月2日。根据生产异构体2,3-二氟-6-硝基苯酚的方法,将2,3,4-三氟硝基苯与碱金属或碱土金属氢氧化物的水溶液在不存在的情况下反应 的有机溶剂中,在约20℃至100℃的温度下,通过酸加成将反应混合物的pH值设定在约1至6,将所得产物进行流蒸馏,并将2,3-二氟 - 冷却后分离出6-硝基苯酚。 在该方法的任何步骤中都不使用有机溶剂。

    Preparation of polycyclic dyes
    94.
    发明授权
    Preparation of polycyclic dyes 失效
    多环染料的制备

    公开(公告)号:US5214161A

    公开(公告)日:1993-05-25

    申请号:US898833

    申请日:1992-06-15

    Inventor: David J. Milner

    CPC classification number: C07D493/04 C09B57/00

    Abstract: A process for the preparation of a polycyclic dye of the Formula (1): ##STR1## by reacting a ketal ester of the Formula (2): ##STR2## with a benzofuranone of the Formula (3): ##STR3## wherein: Ring A is unsubstituted or is substituted by from one to three groups:Ring B is unsubstituted, apart from the nitro group, or is substituted by one or two additional groups;each R is independently alkyl.The polycyclic dyes described are useful for the coloration of synthetic textile materials especially polyesters.

    Method for ether formation
    95.
    发明授权
    Method for ether formation 失效
    醚形成方法

    公开(公告)号:US5185471A

    公开(公告)日:1993-02-09

    申请号:US797584

    申请日:1991-11-25

    CPC classification number: C07C201/12

    Abstract: A process for the preparation of 1,1'-oxy-bis(3-trifluoromethyl-4-nitrobenzene) which comprises reacting a compound of the formula ##STR1## where X is F, Cl, Br or I; with an inorganic base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal bicarbonates, in the presence of a catalytic quantity of a benzoate catalyst. In addition, benzoate esters of 4-nitro-3-trifluoromethylphenol may be isolated.

    Abstract translation: 一种制备1,1'-氧 - 双(3​​-三氟甲基-4-硝基苯)的方法,包括使式(VI)的化合物与其中X为F,Cl,Br或I的化合物反应; 与选自碱金属氢氧化物,碱金属碳酸盐和碱金属碳酸氢盐的无机碱在催化量的苯甲酸酯催化剂存在下反应。 此外,可以分离4-硝基-3-三氟甲基苯酚的苯甲酸酯。

    1,3-di-arylmethoxy-4,6-dinitro-benzenes, process for their preparation
and process for the preparation of 4,6-diaminoresorcinol
    98.
    发明授权
    1,3-di-arylmethoxy-4,6-dinitro-benzenes, process for their preparation and process for the preparation of 4,6-diaminoresorcinol 失效
    1,3-二氨基四甲基-4,6-二苯乙烯,其制备方法和制备4,6-DIAMINORESORCINOL的方法

    公开(公告)号:US5072053A

    公开(公告)日:1991-12-10

    申请号:US526357

    申请日:1990-05-21

    CPC classification number: C07C205/37 C07C213/02

    Abstract: The new 1,3-di-arylmethoxy-4,6-dinitrobenzenes of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another denote hydrogen or C.sub.1 -C.sub.4 -alkyl andAr represents C.sub.6 -C.sub.12 -aryl,can be prepared by reaction of 1,3-dihalogeno-4,6-dinitro-benzenes of the formula ##STR2## in which Hal represents chlorine or bromine, with an arylmethanol of the formulaAr--C(R.sup.1, R.sup.2)OH (IV),in which R.sup.1, R.sup.2 and Ar have the said meaning, and a strong base in the temperature range from 0.degree. to 100.degree. C.These di-arylmethoxy-dinitro-benzenes can be converted into 4,6-diaminoresorcinol by catalytic reduction with hydrogen.

    Abstract translation: 式(Ⅰ)的新的1,3-二芳基甲氧基-4,6-二硝基苯,其中R 1和R 2彼此独立地表示氢或C 1 -C 4烷基,Ar表示C 6 -C 12 - 芳基, 可以通过式(III)的1,3-二卤代-4,6-二硝基苯(其中Hal表示氯或溴)与式Ar-C的芳基甲醇(R1,R2 )OH(IV),其中R1,R2和Ar具有所述含义,在0℃至100℃的温度范围内具有强碱。这些二芳基甲氧基 - 二硝基苯可以转化为4,6- 用氢气催化还原二氨基间苯二酚。

    Method of preparing monohalogenated nitroalkanes
    99.
    发明授权
    Method of preparing monohalogenated nitroalkanes 失效
    制备单卤代硝基烷烃的方法

    公开(公告)号:US5043489A

    公开(公告)日:1991-08-27

    申请号:US529747

    申请日:1990-05-24

    CPC classification number: C07C201/12

    Abstract: A method of preparing a monohalogenated nitroalkane which comprises reacting equal molar quantities of an alkali metal hydroxide and a nitroalkane in a suitable medium to form a nitronate salt therein, promptly mixing the medium containing the nitronate salt with an equal molar quantity of a halogen to form a monohalogenated nitroalkane in the medium, promptly adding a material to the medium containing the monohalogenated nitroalkane to terminate any further halogenation therein, and recovering the monohalogenated nitroalkane from the medium.

    Abstract translation: 一种制备单卤代硝基烷烃的方法,其包括使等摩尔量的碱金属氢氧化物和硝基烷烃在合适的介质中反应以形成其中的硝酸盐,迅速将含有硝酸盐的介质与等摩尔量的卤素混合形成 介质中的单卤代硝基烷烃,迅速向含有单卤代硝基烷烃的介质中加入一种材料,以终止其中任何进一步的卤化,并从介质中回收一卤代硝基烷烃。

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