Journal of the Japan Petroleum Institute
Online ISSN : 1349-273X
Print ISSN : 1346-8804
ISSN-L : 1346-8804
Regular Paper
Application of Tripodal Linker Units to Immobilized Diphenylphosphine Palladium Complex Catalysts for Suzuki-Miyaura Coupling Reactions of Aryl Bromide: Effect of Immobilization Method of Phosphine Ligand on Catalytic Performance
Norihisa FUKAYATakayuki MIYAJIShun-ya ONOZAWASeong Jib CHOIMasae UEDAYukio TAKAGIJun-Chul CHOIToshiyasu SAKAKURAHiroyuki YASUDA
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2016 Volume 59 Issue 4 Pages 118-125

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Abstract

A tripodal linker unit that tightly binds to a silica surface via three independent Si–O–Si bonds was applied to immobilize diphenylphosphino-palladium complex catalysts onto ordered mesoporous silica. The diphenylphosphino-functionalized silica materials were prepared by: (i) grafting the bromine-substituted tripodal linker unit onto mesoporous silica and a subsequent treatment with potassium diphenylphosphide (the “bottom-up” method), (ii) directly grafting pre-synthesized tripodal diphenylphosphino ligands onto silica (the “top-down” method). The catalytic properties were evaluated in the Suzuki-Miyaura coupling reaction of aryl bromides. The tripodally immobilized catalyst prepared via the “bottom-up” method showed lower leaching levels of palladium and phosphorus compared to catalyst prepared via the “top-down” method.

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© 2016 by The Japan Petroleum Institute
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