The Roles of 3- and 4-Isopropylbiphenyls in the Isopropylation of Biphenyl over a H-Mordenite |
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Authors: | Y Sugi T Sugimura S Tawada Y Kubota T Hanaoka and T Matsuzaki |
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Affiliation: | (1) Department of Chemistry, Faculty of Engineering, Gifu University, Gifu, 501-1193, Japan;(2) National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Higashi 1-1-1, Tsukuba, 305-5585, Japan |
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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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Keywords: | 3- and 4-IPBS isopropylation biphenyl H-mordenite |
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