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Norbornene derivatives bearing endo-substituents in the 5- and 6-positions were studied as substrates for ene–yne metathesis cascades. Substrates which contained an internal alkyne and a terminal alkene or alkyne in each sidechain were found to undergo a metathesis cascade leading to pentacyclic bis-dienes and bis-trienes. Attempts to extend the chemistry further to sidechains containing two internal...
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