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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 

Isomerization of 5-Vinyl-2-norbornene Using Sodium-coated Catalysts
Ji Hee Oh, Byoung Sung Ahn, Jeong Sik Han, Sang Deuk Lee, Seung Wook Kim, Hyunjoo Lee*,
Double bond isomerization, 5-Ethylidene-2-norbornene, EPDM rubber, Solid base catalyst
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 (pKBH ≥ 27) and one-electron donor sites on the Na/Al2O3 is prerequisite for the isomerization of VNB to take place.
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