title: Photochemical cycloisomerizations via 7-exo-dig reactions on a calix[4]arene scaffold.
abstract: Narrow-rim 1,3-bis(phenylethynyl)-p-tert-butylcalix[4]arenes were found to be photolabile, producing unprecedented seven-membered oxacyclic systems formed via 7-exo-dig cyclizations and a new [3.2.1]bicyclic system via subsequent 1,8-H shifts. The calixarene provided a scaffold for these unprecedented photochemical reactions to occur.
authors.affiliation: Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada.
authors.forename: Hassan
authors.initials: H
authors.lastname: Al-Saraierh
authors.forename: David O
authors.initials: DO
authors.lastname: Miller
authors.forename: Paris E
authors.initials: PE
authors.lastname: Georghiou