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    • 5. 发明授权
    • Aromatic transformation process
    • 芳香族转化过程
    • US5210353A
    • 1993-05-11
    • US620529
    • 1990-11-30
    • Carl A. UdovichE. William Breder, Jr.Ibrahim GhanayemMark W. MeszarosThomas E. NemoThomas G. Smith
    • Carl A. UdovichE. William Breder, Jr.Ibrahim GhanayemMark W. MeszarosThomas E. NemoThomas G. Smith
    • C07C6/12
    • C07C6/126
    • A process is provided for transaralkylating a class of starting compounds comprised of aryl-substituted lower alkanes and aryl-substituted fused alkylene ring compounds to produce derivatives of such compounds wherein benzyl substituents thereof have different alkyl substituents compared to the starting compounds. The process is carried out by admixing such a starting compound with a lower alkyl-substituted aromatic compound under liquid phase conditions in the presence of a catalytically effective amount of a Friedel-Crafts catalyst. The process makes possible new and economical routes for synthesizing desired lower alkyl-substituted benzyl group containing compounds, such as 2,2-di(lower alkyl-substituted) phenyl propanes and 1,3,3-trimethyl-1-(lower alkyl-substituted)-phenyl indans. Thus, there is provided a three-step process for making dixylylpropane from alpha methyl styrene and also a two-step process for making 1,3,3,6-tetramethyl-1-o-xylyl indan from alpha-4-dimethyl styrene. Provided also is a process for preparing 3,3',4,4'-dixylylmethane from a mixture of isomeric dixylylmethanes.
    • 提供了一种方法,用于将由芳基取代的低级烷烃和芳基取代的稠合亚烷基环化合物组成的一类起始化合物转烷基化以产生这样的化合物的衍生物,其中苄基取代基与起始化合物相比具有不同的烷基取代基。 该方法通过在液相条件下在催化有效量的Friedel-Crafts催化剂的存在下将这种起始化合物与低级烷基取代的芳族化合物混合来进行。 该方法可用于合成所需的低级烷基取代苄基化合物如2,2-二(低级烷基取代的)苯基丙烷和1,3,3-三甲基-1-(低级烷基取代的苄基) 取代的) - 苯基茚二酮。 因此,提供了由α-甲基苯乙烯制备二甲苯基丙烷的三步法,以及由α-4-二甲基苯乙烯制备1,3,3,6-四甲基-1-邻苯二甲酰基茚二酮的两步法。 还提供了从异构二烷基甲烷的混合物制备3,3',4,4'-二甲苯基甲烷的方法。