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Mechanistic Investigation of the Isomerization of 5-Vinyl-2-norbornene

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posted on 2006-02-03, 00:00 authored by Hoon Sik Kim, So Young Lee, Hyunjoo Lee, Jin Young Bae, Sang Joon Park, Minserk Cheong, Je Seung Lee, Chang-Ha Lee
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.

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