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    • 51. 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。