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    • 4. 发明授权
    • Manufacture of alkylanthraquinones
    • 烷基蒽醌的制备
    • US4404140A
    • 1983-09-13
    • US314869
    • 1981-10-26
    • William L. Evans
    • William L. Evans
    • C07C46/00C07C49/68
    • C07C46/00
    • A process for preparing alkylanthrquinones wherein the alkyl group contains from 2 to 5 carbon atoms such as 2-ethylanthraquinone, 2-t-amylanthraquinone or 2-t-butylanthraquinone by ring closure from the corresponding alkylbenzoylvenzoic acid is disclosed. The process involves adding a solution of the alkylbenzoylbenzoic acid to 100% concentrated sulfuric acid or up to 12% oleum, distilling off the solvent at from 20.degree. to 60.degree. C., heating the remaining solution to from 80.degree. to 95.degree. C. and preferably from 83.degree. to 87.degree. C. for 3 to 5 hours, diluting the remaining reaction mixture with water and separating the alkylanthraquinone product.
    • 公开了一种制备烷基蒽醌的方法,其中烷基含有2至5个碳原子,例如2-乙基蒽醌,2-叔戊基蒽醌或2-叔丁基蒽醌,由相应的烷基苯甲酰基化合物通过闭环。 该方法包括将烷基苯甲酰基苯甲酸溶液加到100%浓硫酸或最多12%发烟硫酸中,在20至60℃蒸出溶剂,将剩余溶液加热至80-95℃。 优选在83℃至87℃下反应3至5小时,用水稀释剩余的反应混合物并分离出烷基蒽醌产物。