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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 11
BKCSDE 29(11)
November 20, 2008

Title	Isomerization of 5-Vinyl-2-norbornene Using Sodium-coated Catalysts
Author	Ji Hee Oh, Byoung Sung Ahn, Jeong Sik Han, Sang Deuk Lee, Seung Wook Kim, Hyunjoo Lee*,
Keywords	Double bond isomerization, 5-Ethylidene-2-norbornene, EPDM rubber, Solid base catalyst
Abstract	Various sodium-coated metal oxide catalysts were prepared using readily available supporting materials such as neutral γ-Al₂O₃ (neutral alumina, N-Al₂O₃) basic γ-Al₂O₃ (basic alumina, B-Al₂O₃), SiO₂, MgO, and TiO₂, and their catalytic activities were evaluated for the isomerization of 5-vinyl-2-norbornene (VNB) to 5- ethylidene-2-norbornene (ENB). Of various sodium-coated catalysts, Na/N-Al₂O₃ and Na/B-Al₂O₃ showed extremely high activities, resulting in quantitative conversion of VNB. Catalyst characterization and isomerization results clearly demonstrated that the presence of both strong basic sites (pK_BH ≥ 27) and one-electron donor sites on the Na/Al₂O₃ is prerequisite for the isomerization of VNB to take place.
Page	2202 - 0
Full Text	PDF

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