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    Process for preparing diazonium salts of 3-amino-pyrazole
    2.
    发明授权
    Process for preparing diazonium salts of 3-amino-pyrazole 失效
    制备3-氨基 - 吡唑的重氮盐的方法

    公开(公告)号：US4268436A

    公开(公告)日：1981-05-19

    申请号：US41550

    申请日：1979-05-23

    申请人： Giampiero Pieri ,  Enzo Rosati ,  Ruggero Battisti ,  Giovanni Burei

    发明人： Giampiero Pieri ,  Enzo Rosati ,  Ruggero Battisti ,  Giovanni Burei

    IPC分类号： C07D231/38 ,  C07D231/42 ,  C09B29/036 ,  C09B41/00 ,  C07C107/00 ,  C07C107/04 ,  C07C107/08 ,  C07C113/04

    CPC分类号： C07D231/38

    摘要： 3-Diazonium salts of pyrazole, useful as intermediates in the preparation of azo dyes are obtained by an oxidative diazotization of 3-amino-pyrazolines with nitrous acid or with nitrosyl-sulphuric acid. The 3-diazonium salts of pyrazole have the following structure: ##STR1## wherein: X is a radical --CO-- or --COO--,n is 0 or 1,R is hydrogen (in such case n is always 0), a normal or ramified alkyl C.sub.1 --C.sub.4, an aromatic or heterocyclic, optionally substituted, radical, in particular a phenyl radical having the structure: ##STR2## in which m may vary from 0 to 3 and substituents R.sub.3, either like or unlike one another for m>1, are alkyls C.sub.1 --C.sub.4 with linear or ramified chain, halogens, a cyano, nitro, sulphonic or carboxylic group, carboxyesters having a linear or ramified chain C.sub.1 --C.sub.4, alkoxyls having a linear or ramified chain C.sub.1 --C.sub.4, trifluoro-methyl groups, acylamino groups having a linear or ramified aliphatic chain C.sub.1 --C.sub.4, or sulphonamide groups of the type ##STR3## wherein substituents R.sub.4 and R.sub.5, like or unlike each other, are hydrogen, or linear or ramified aliphatic chains C.sub.1 --C.sub.4, andR.sub.1 and R.sub.2, either like or unlike each other, are hydrogen, linear or ramified aliphatic chains C.sub.1 --C.sub.4, or non-substituted or substituted benzene residues.

    摘要翻译： 通过用亚硝酸或亚硝酰基硫酸对3-氨基 - 吡唑啉进行氧化重氮化可以得到用作制备偶氮染料中的中间体的吡唑的3-重氮鎓盐。 吡唑的3-重氮盐具有以下结构：其中：X是-CO-或-COO-基团，n是0或1，R是氢（在这种情况下，n总是为0） ，正烷基或分支的烷基C1-C4，芳族或杂环的，任选取代的基团，特别是具有以下结构的苯基：其中m可以在0至3之间变化，并且取代基R3与或不同于一个 对于m> 1，另一个是具有直链或支链，卤素，氰基，硝基，磺酸或羧基的烷基C1-C4，具有直链或支链C 1 -C 4的烷基酯，具有直链或支链C1-C4 三氟甲基，具有线性或分枝的脂族链C1-C4的酰基氨基或类型“IMAGE”的磺酰胺基团，其中取代基R 4和R 5彼此相似或不同，为氢，或直链或分枝的脂族链C1 -C4和R1和R2彼此相似或不同，是氢，直链或分枝的脂族链C1-C4或n 取代或取代的苯残基。