Method for the preparation of 2,3,5-trimethylbenzoquinone
    3.
    发明授权
    Method for the preparation of 2,3,5-trimethylbenzoquinone 失效
    制备2,3,5-三甲苯硼酸的方法

    公开(公告)号:US5245059A

    公开(公告)日:1993-09-14

    申请号:US318716

    申请日:1989-03-03

    IPC分类号: C07C46/06 C07C50/02

    CPC分类号: C07C50/02 C07C46/06

    摘要: 2,3,5-Trimethyl-p-benzoquinone is prepared advantageously by the catalytic oxidation of 2,3,5- or 2,3,6-trimethylphenol with hydrogen peroxide in an organic solvent, which is preferably acetic acid, in the presence of a catalyst which is a heteropolyacid of silicon or phosphorus as the center atom selected from phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid and silicotungstic acid. The reaction proceeds rapidly even at room temperature to give the product in a high yield so that the method is industrially advantageous in addition to the advantages in respect of the inexpensiveness of the reactants and catalyst and absence of any noxious byproducts which may cause environmental pollution.

    Method for the preparation of cyclohexanone
    4.
    发明授权
    Method for the preparation of cyclohexanone 失效
    环己酮的制备方法

    公开(公告)号:US4400544A

    公开(公告)日:1983-08-23

    申请号:US341758

    申请日:1982-01-22

    CPC分类号: C07C45/34

    摘要: The invention provides an efficient method for the preparation of cycloheone by the liquid-phase oxidation of cyclohexene in the presence of a catalyst system. The rate of conversion of the cyclohexene and the yield of cyclohexanone are unexpectedly increased when the reaction mixture brought into contact with oxygen or air contains a limited amount of an aliphatic alcohol having 2-10 carbon atoms in a molecule such as ethyl alcohol with the catalyst system composed of a palladium compound, e.g. PdCl.sub.2, and at least one co-catalytic ingredient which is a copper compound or iron compound such as CuCl.sub.2 or FeCl.sub.3. The influence of benzene or cyclohexane admixed in the reaction mixture was studied to indicate no adverse effects or even better results in the reaction giving further advantages of the process in which the starting cyclohexene need not be purified and can be used as prepared by the partial hydrogenation of benzene or partial dehydrogenation of cyclohexane.

    摘要翻译: 本发明提供了一种在催化剂体系存在下通过环己烯的液相氧化制备环己酮的有效方法。 当与氧气或空气接触的反应混合物含有有限量的分子中具有2-10个碳原子的脂族醇(例如乙醇)与催化剂时,环己烯的转化率和环己酮的转化率出人意料地增加 系统由钯化合物组成,例如 PdCl 2和至少一种作为铜化合物或铁化合物如CuCl 2或FeCl 3的助催化成分。 研究了在反应混合物中混合的苯或环己烷的影响,表明在反应中没有不利影响或甚至更好的结果,给出其中起始环己烯不需要纯化并可通过部分氢化制备的方法的进一步优点 的苯或环己烷的部分脱氢。