Method for the production of 3,3'4,4'-tetraaminobiphenyl
    1.
    发明授权
    Method for the production of 3,3'4,4'-tetraaminobiphenyl 失效
    制备3,3'4,4'-四氨基联苯的方法

    公开(公告)号:US5041666A

    公开(公告)日:1991-08-20

    申请号:US82265

    申请日:1987-08-06

    IPC分类号: C07C211/50

    CPC分类号: C07C211/50

    摘要: A method is provided for the production of 3,3', 4,4'-tetraaminobiphenyl (TAB) from biphenyl comprising the following steps:1) acetylating the biphenyl in the presence of an appropriate Friedel-Crafts catalyst to obtain 4,4'-diacetylbiphenyl (DAcB);2) oximating the DAcB to form DAcB dioxime;3) subjecting the dioxime to a double Beckmann rearrangement to obtain N,N-diacetylbenzidine (DiAcBz);4) nitrating the DiAcBz to obtain 3,3'-dinitro-N,N-diacetylbenzidine (DNAcBz)5) removing the acetyl groups of the DNAcBz by basic hydrolysis to form 3,3'-dinitrobenzidine (DNB); and6) reducing the nitrate groups of the DNB to form TAB.

    摘要翻译: 提供从联苯制备3,3 + 40,4,4'-四氨基联苯(TAB)的方法,包括以下步骤:1)在合适的Friedel-Crafts催化剂存在下使联苯乙酰化得到4,4 ' - 乙酰基联苯(DAcB); 2)使DAcB肟化形成DAcB二肟; 3)使二肟双重Beckmann重排,得到N,N-二乙酰基联苯胺(DiAcBz); 4)硝化DiAcBz得到3,3'-二硝基-N,N-二乙酰基联苯胺(DNAcBz)5)通过碱水解除去DNAcBz的乙酰基,形成3,3'-二硝基联苯胺(DNB); 和6)减少DNB的硝酸盐基团形成TAB。

    Process for producing thioalkyl or thioarylphenones
    4.
    发明授权
    Process for producing thioalkyl or thioarylphenones 失效
    制备硫代烷基或硫代芳基化合物的方法

    公开(公告)号:US4994623A

    公开(公告)日:1991-02-19

    申请号:US500112

    申请日:1990-03-27

    IPC分类号: C07C319/20 C07C323/22

    CPC分类号: C07C319/20 C07C323/22

    摘要: Thiophenones are produced by acylating the aromatic ring of thiophenolic ethers in the presence of anhydrous hydrofluoric acid. It has been found that if the thio group is in the form of a thioether and not a thiol, the aromatic ring can be acylated to form the thiophenone in the presence of anhydrous hydrofluoric acid.

    摘要翻译: 通过在无水氢氟酸存在下酰化硫代酚醚的芳环来制备噻吩酮。 已经发现,如果硫基是硫醚而不是硫醇的形式,则芳族环可以在无水氢氟酸的存在下酰化形成噻吩酮。