(en'dō-sī'klik, -sik'lik),
Within a cycle or ring, for example, the six carbon atoms of the benzene ring in toluene. Compare: exocyclic.
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Key statement: A rubber material is described, modified with a barrier material in the form of a copolymer which can be produced via ring-opening metathesis polymerization of a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C--C double bonds and bicyclic olefin monomers having one endocyclic C--C double bond and b) at least one polycyclic olefin monomer having at least two C--C double bonds.
These carbohydrate mimics substitute the endocyclic oxygen of sugars with a basic nitrogen atom.
Hydrogenation in the presence of palladium on carbon catalyst removes the endocyclic olefin, and the stereochemistry at the alcohol was inverted by converting it into the mesylate, which was then displaced with cesium acetate.