1-hydroxyimidazole compounds
    7.
    发明授权
    1-hydroxyimidazole compounds 失效
    1-羟基咪唑化合物

    公开(公告)号:US5484938A

    公开(公告)日:1996-01-16

    申请号:US800065

    申请日:1991-11-27

    摘要: The preparation of 1-hydroxyimidazoles of the formula I ##STR1## where the R radicals can be identical or different and are each halogen or an organic radical, it also being possible for vicinal radicals to be connected to form an aromatic or nonaromatic ring of from 3 to 12 carbon atoms, and n is from 0 to 3, entails reacting an imidazole of the formula II ##STR2## where Q is preferably hydrogen or, especially where R is not halogen, an alkali metal or alkaline earth metal cation, with an organic peroxide.The 1-hydroxyimidazole and its halogen substituted derivatives of the formula I and the acid addition salts thereof are valuable intermediates for organic syntheses.

    摘要翻译: 制备式I(I)的1-羟基咪唑,其中R基团可以相同或不同,各自为卤素或有机基团,连接基团可连接形成芳族或非芳族化合物 3至12个碳原子的环,n为0至3,使式II(II)的咪唑与Q优选为氢或特别是其中R不是卤素的碱金属或碱 土壤金属阳离子,有机过氧化物。 式I的1-羟基咪唑及其卤素取代的衍生物及其酸加成盐是有机合成的有价值的中间体。

    Preparation of N-hydroxypyrazoles
    10.
    发明授权
    Preparation of N-hydroxypyrazoles 失效
    N-羟基吡唑的制备

    公开(公告)号:US4945167A

    公开(公告)日:1990-07-31

    申请号:US367047

    申请日:1989-06-16

    摘要: 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.

    摘要翻译: 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。