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A variety of chiral 6-hepten-1-ynes have been found to undergo cyclization to titanabicyclopentenes by (η 2 -propene)Ti(Oi-Pr) 2 with excellent yields and degrees of exo-stereoselectivity depending on the substrate steric requirements. In the framework of a plausible cyclization mechanism several conformational features which can regulate the stereoinduction have been suggested.
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