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Direct Alkylation of Benzene at Lower Temperatures in the Liquid Phase: Catalysis by Montmorillonites as Noble‐Metal‐Free Solid Acids
Author(s) -
Takabatake Moe,
Nambo Masayuki,
Manaka Yuichi,
Motokura Ken
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000090
Subject(s) - alkylation , chemistry , benzene , catalysis , noble metal , montmorillonite , alkyl , organic chemistry , halide , heterogeneous catalysis , inorganic chemistry
Abstract Alkylated benzenes are widely used as raw materials for the production of a variety of chemical compounds. Conventionally, they are 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 the direct alkylation of benzene 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.