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The Roles of 3- and 4-Isopropylbiphenyls in the Isopropylation of Biphenyl over a H-Mordenite

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Abstract

The isopropylation of mixtures of 3- and 4-isopropylbiphenyls (3- and 4-IPBPs) was examined over a dealuminated H-mordenite (HM) to elucidate the role of 3- and 4-IPBPs in the isopropylation of biphenyl (BP). 4-IPBP was consumed much faster than 3-IPBP in all cases. 4-IPBP was an exclusive precursor to diisopropylbiphenyls (DIPBs), particularly 4,4′-DIPB, and 4,4′-DIPB was found in encapsulated products during the reaction. These results show that 4-IPBP can allow establishment of an active complex with propylene and acid site in HM pores, whereas 3-IPBP cannot. It is concluded that the isopropylation of BP over HM occurs through a reactant selectivity mechanism, and through a restricted transition state mechanism, but not through a product selectivity mechanism.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Engineering, Gifu University, Gifu, 501-1193, Japan

    Y. Sugi, T. Sugimura, S. Tawada & Y. Kubota

  2. National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Higashi 1-1-1, Tsukuba, 305-5585, Japan

    T. Hanaoka & T. Matsuzaki

Authors
  1. Y. Sugi
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  2. T. Sugimura
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  3. S. Tawada
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  4. Y. Kubota
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  5. T. Hanaoka
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  6. T. Matsuzaki
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Sugi, Y., Sugimura, T., Tawada, S. et al. The Roles of 3- and 4-Isopropylbiphenyls in the Isopropylation of Biphenyl over a H-Mordenite. Catalysis Letters 77, 159–163 (2001). https://doi.org/10.1023/A:1012730910613

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