Cycloheptadiene Ring Synthesis by Tandem Intermolecular Enyne Metathesis

Abstract
The tandem intermolecular enyne metathesis between 1-alkynes and cyclopentene is reported, providing 2-substituted 1,3-cycloheptadienes. The success of the intermolecular reaction hinges on an appropriate balance between cycloalkene ring strain and reactivity of the alkyne.