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    • 27. 发明授权
    • Preparation of N-hydroxypyrazoles
    • N-羟基吡唑的制备
    • US4945167A
    • 1990-07-31
    • US367047
    • 1989-06-16
    • Ulf BausWolfgang ReutherErwin Hahn
    • Ulf BausWolfgang ReutherErwin Hahn
    • C07D231/12C07D231/16C07D521/00
    • C07D231/12C07D231/16C07D233/56C07D249/08
    • N-hydroxypyrazoles of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 may be identical or different and are each hydrogen or halogen, are prepared by a process in which a pyrazole of the general formula II ##STR2## where R.sup.1, R.sup.2 and R.sup.3 have the meanings stated for formula I, is reacted with an aliphatic or aromatic peroxocarboxylic acid, preferably in the presence of from 0 to 15 moles of an alkali metal hydroxide, alkaline earth metal hydroxide, alkali meteal carbonate or alkaline earth metal carbonate in such a way that the reaction temperature is from -5.degree. C. to 60.degree.C.The reaction can be carried out in water as a solvent or in a 2-phase system consisting of water and an inert organic solvent which is poorly miscible with water, in the presence or absence of a suitable phase transfer catalyst. The peroxocarboxylic acid can be prepared in the reaction mixture before the reaction from H.sub.2 O.sub.2 and an acyl halide or a carboxylic anhydride or can be used in the form of an alkali metal salt or alkaline earth metal salt.
    • 其中R 1,R 2和R 3可以相同或不同并且各自为氢或卤素的通式I(I)的N-羟基吡唑通过其中通式II的吡唑(IMAGE)( II)其中R 1,R 2和R 3具有式I所述的含义,与脂族或芳族过氧羧酸反应,优选在0至15摩尔碱金属氢氧化物,碱土金属氢氧化物,碱金属碳酸盐 或碱土金属碳酸盐,使得反应温度为-5℃至60℃。该反应可以在作为溶剂的水中或在由水和惰性有机物组成的2相体系中进行 在有或没有合适的相转移催化剂的情况下与水很难混溶的溶剂。 过氧化羧酸可以在与H 2 O 2和酰卤或羧酸酐反应之前在反应混合物中制备,或者可以以碱金属盐或碱土金属盐的形式使用。
    • 28. 发明授权
    • Preparation of N-hydroxypyrazoles
    • N-羟基吡唑的制备
    • US4945166A
    • 1990-07-31
    • US367053
    • 1989-06-16
    • Ulf BausWolfgang ReutherRolf Fikentscher
    • Ulf BausWolfgang ReutherRolf Fikentscher
    • C07D231/12C07D231/16C07D231/54C07D231/56C07D521/00
    • C07D249/08C07D231/12C07D231/16C07D231/56C07D233/56
    • N-hydroxypyrazoles of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 may be identical or different and are each hydrogen, alkyl, halogen or aryl, or R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 together with the carbon atoms carrying these radicals form an aromatic or nonaromatic ring of 5 or 6 carbon atoms are prepared by a process in which(A) a pyrazole of the general formula II ##STR2## is converted in a conventional manner with an alkali metal hydroxide, alkali metal hydride or alkali metal carbonate into one of its metal salts of the general formula III ##STR3## where ME.sym. is a cation of an alkali metal, and (B) the resulting metal salt of the general formula III is reacted with dibenzoyl peroxide in an inert organic solvent or in a 2-phase system, in the presence or absence of a phase transfer catalyst.
    • 通式I的N-羟基吡唑(I)其中R 1,R 2和R 3可以相同或不同,各自为氢,烷基,卤素或芳基,或R 1和R 2或R 2和R 3与携带的碳原子一起 这些基团形成5或6个碳原子的芳族或非芳族环是通过以下方法制备的:其中(A)通式II的吡唑(II)以常规方式用碱金属氢氧化物,碱 金属氢化物或碱金属碳酸盐转化成其通式III(III)的金属盐之一,其中ME(+)是碱金属的阳离子,和(B)所得到的通式III的金属盐是 在相转移催化剂存在或不存在下,在惰性有机溶剂或2-相体系中与二苯甲酰基过氧化物反应。