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    • 5. 发明授权
    • Preparation of 4(5)-hydroxymethyl-5(4)-methylimidazole
    • 4(5) - 羟甲基-5(4) - 甲基咪唑的制备
    • US4734509A
    • 1988-03-29
    • US854537
    • 1986-04-22
    • Jacob HerzigBen Z. WeinerStephan CherkezAbraham Antebi
    • Jacob HerzigBen Z. WeinerStephan CherkezAbraham Antebi
    • C07D233/54C07D233/64
    • C07D233/64
    • 4(5)-Hydroxymethyl-5(4)-methylimidazole (MHI) is prepared by a process comprising the steps of:(a) reacting 4-methylimidazole (MI) with from 1.05 to 1.1 moles of formaldehyde or an equivalent amount of paraformaldehyde per mole of MI, in a concentrated aqueous NaCl solution in the presence of a catalytically effective amount of a strong inorganic base, at a temperature from about 20.degree. to about 60.degree. C.;(b) neutralizing the reaction mixture with concentrated aqueous hydrochloric acid to a pH of 8.5-8.9 to obtain a precipitate of MHI free base; and(c) separating the precipitate thus obtained from the aqueous solution and washing it with cold water or acetone.The MHI free base thus obtained can further be converted to an acid addition salt thereof.
    • 4(5) - 羟甲基-5(4) - 甲基咪唑(MHI)通过包括以下步骤的方法制备:(a)使4-甲基咪唑(MI)与1.05-1.1摩尔甲醛或当量的多聚甲醛 在约20℃至约60℃的温度下,在催化有效量的强无机碱的存在下,在浓的NaCl水溶液中,每摩尔MI。 (b)用浓盐酸水溶液中和反应混合物至pH 8.5-8.9,得到游离碱的游离碱沉淀物; 和(c)从水溶液中分离由此获得的沉淀物并用冷水或丙酮洗涤。 由此获得的MHI游离碱可进一步转化为其酸加成盐。