Alkylated benzenes are widely used as raw materials for the production of a variety of chemical compounds. Conventionally, they have been obtained by the Friedel–Crafts reaction between alkyl halides and benzene. In this study, the synthesis of halogen‐free alkylated benzenes was made possible by direct benzene alkylation with alkanes using montmorillonites as noble‐metal‐free solid acid catalysts. The direct alkylation of benzene with n ‐heptane was performed at 150 °C. Aluminum‐exchanged montmorillonite showed the highest yield of the target C‐7 alkylated products (Ph‐C7) compared with other homogeneous and heterogeneous acid catalysts: 1.8% conversion of benzene with 58% selectivity in 16 h. The montmorillonite catalyst system was applied to other linear and cyclic alkanes to give the corresponding alkylated products with good selectivities.

中文翻译：

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液相在低温下将苯直接烷基化：蒙脱土作为无贵金属固体酸的催化作用

烷基化苯广泛用作生产各种化合物的原料。按照惯例，它们是通过卤代烷和苯之间的Friedel-Crafts反应获得的。在这项研究中，使用蒙脱石作为无贵金属的固体酸催化剂，通过与烷烃直接进行苯烷基化，可以合成无卤的烷基苯。苯与正庚烷的直接烷基化反应在150°C下进行。与其他均相和非均相酸催化剂相比，铝交换蒙脱土显示出目标C-7烷基化产物（Ph-C7）的最高收率：16小时内苯转化率为1.8％，选择性为58％。将蒙脱石催化剂体系应用于其他线性和环状烷烃，以得到具有良好选择性的相应烷基化产物。