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An innovative route for intramolecular cyclization of pent- 4-en-1-ol has been delineated through a ring closing reaction with phenylselenyl halides, in good yield. Several catalysts (triethylamine, quinoline, 2,2ʹ-bipyridine, pyridine, CoCl 2  and SnCl 2 ) enable fast, facile and efficient cyclization.

Cyclization of Unsaturated Alcohols. Mild and Efficient Selenocyclization of Pent-4-en-1-ol