title: Mechanistic investigation of the isomerization of 5-vinyl-2-norbornene.
abstract: The isomerization reaction of 5-vinyl-2-norbornene (VNB) to 5-ethylidene-2-norbornene (ENB) has been performed using a catalytic system consisting of an alkali metal hydride and an amine. Among various amines tested, only aliphatic 1,2-diamines exhibited the activity for the isomerization. The isomerization was also affected by the alkali metal hydride employed. The activity of the alkali metal hydride increased with the increasing size of alkali metal: KH > NaH > LiH. A series of electron paramagnetic resonance (EPR) and UV-vis experiments on the active species suggest that the isomerization of VNB proceeds through a radical mechanism.
authors.affiliation: Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Dondaemoon-gu, Seoul 130-701, Korea. khs2004@khu.ac.kr
authors.forename: Hoon Sik
authors.initials: HS
authors.lastname: Kim
authors.forename: So Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Hyunjoo
authors.initials: H
authors.lastname: Lee
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Bae
authors.forename: Sang Joon
authors.initials: SJ
authors.lastname: Park
authors.forename: Minserk
authors.initials: M
authors.lastname: Cheong
authors.forename: Je Seung
authors.initials: JS
authors.lastname: Lee
authors.forename: Chang-Ha
authors.initials: CH
authors.lastname: Lee