Process for the preparation of p-benzoquinone
    3.
    发明授权
    Process for the preparation of p-benzoquinone 失效
    制备对苯醌的方法

    公开(公告)号:US4973720A

    公开(公告)日:1990-11-27

    申请号:US253056

    申请日:1988-10-04

    CPC分类号: C07C46/06

    摘要: There is provided a process of producing p-benzoquinone, wherein hydroquinone and hydrogen peroxide are reacted in water, an aqueous inorganic acid solution, an inert organic polar solvent or a mixture of water with an inert organic polar solvent in the presence of a catalyst selected from the group consisting of iodine, hydrogen iodide, and iodine compounds of metals.According to the process, p-benzoquinone can be obtained from hydroquinone with the yield and the quality of the p-benzoquinone being high without requiring any special facilities, equipments and operations.

    摘要翻译: 提供了一种生产对苯醌的方法,其中氢醌和过氧化氢在水中,无机酸水溶液,惰性有机极性溶剂或水与惰性有机极性溶剂的混合物在选择的催化剂存在下反应 由碘,碘化氢和金属碘化合物组成。 根据该方法,对苯醌可以由氢醌获得,对苯醌的产率和质量高,无需任何特殊设备,设备和操作。

    Method for preparing sulfones
    6.
    发明授权
    Method for preparing sulfones 失效
    制备砜的方法

    公开(公告)号:US5248828A

    公开(公告)日:1993-09-28

    申请号:US896313

    申请日:1992-06-10

    CPC分类号: C07C315/04 C07C315/00

    摘要: A method for preparing a sulfone represented by the following formula: ##STR1## wherein R' represents a lower alkyl group, an aryl group or an aryl group whose nucleus has at least one substituent selected from the group consisting of a halogen atom, nitro group, a lower alkyl group, phenyl group and a phenyl group substituted with a halogen atom, or an alkali metal salt thereof. A sulfonic acid ester of 4-hydroxybiphenyl is condensed at a temperature of 0.degree. to 200.degree. C. in a presence of a Lewis acid or a super-strong acid with a sulfonyl chloride represented by the formula R'SO.sub.2 Cl, wherein R' is the same as that defined above.

    摘要翻译: 一种制备由下式表示的砜的方法:其中R'表示低级烷基,芳基或芳基,其核具有至少一个选自卤原子,硝基的取代基 ,低级烷基,苯基和被卤素原子取代的苯基,或其碱金属盐。 在路易斯酸或超强酸与式R'SO2Cl表示的磺酰氯存在下,在0〜200℃的温度下,将4-羟基联苯的磺酸酯缩合,其中R'为 与上述相同。