Mechanistic investigation of the isomerization of 5-vinyl-2-norbornene.
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.
Kim
Hoon Sik
HS
Department of Chemistry, Kyung Hee University, 1 Hoegi-dong, Dondaemoon-gu, Seoul 130-701, Korea. khs2004@khu.ac.kr
Lee
So Young
SY
Lee
Hyunjoo
H
Bae
Jin Young
JY
Park
Sang Joon
SJ
Cheong
Minserk
M
Lee
Je Seung
JS
Lee
Chang-Ha
CH