Method for preparing norbornene and substituted derivatives of norbornene
AssigneeOpatatech Corporation
InventorsChrister Bergström, Jukka Koskinen, Erkki Halme, Matti Lindström, Mika Perälä
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Abstract
Disclosed is a method for the preparation of norbornene and substituted norbornene compounds via a Diels-Alder reaction, in which a cyclic diene is reacted with an olefinic compound in order to prepare a norbornene compound. According to the invention a cyclic diene is gradually added to react with an olefinic compound, in order to keep the concentration of the cyclic diene in the reaction mixture as low as possible during the reaction. It is possible to obtain a very pure product, high yield, short reaction time and high concentrations of the exo diastereomer with the method of the invention.
Claims19
A method of producing a substituted derivative of norbornene by the Diels-Alder reaction, the method comprising:
- reacting a cyclic diene selected from the group consisting of dicyclopentadiene and cyclopentadiene with an olefin compound selected from the group consisting of styrene and indene to yield the substituted norbornene derivative wherein the cyclic diene is added gradually during the reaction, the substituted derivative being phenyl norbornene or indanylnorbornene.
Dependencies are inferred from the claim text.