title: Intramolecular photocycloaddition of dioxenones with alkynes: formation of secondary photoproducts from cyclobutene photoadducts.
abstract: [Reaction: see text] Intramolecular photocycloaddition of 4 leads to the formation of cyclobutene photoadduct 5. Secondary photoreaction of 5 then affords either cyclobutane 19 or the bridged product 7, as a function of R (H or TMS).
authors.affiliation: Department of Chemistry, The University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. winkler@sas.upenn.edu
authors.forename: Jeffrey D
authors.initials: JD
authors.lastname: Winkler
authors.forename: Emily C
authors.initials: EC
authors.lastname: McLaughlin
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D000480:Alkynes / Q000737:chemistry*; D003500:Cyclization; D003503:Cyclobutanes / Q000737:chemistry*; D004146:Dioxanes / Q000737:chemistry*; D006575:Heterocyclic Compounds, 3-Ring / Q000737:chemistry*; D015394:Molecular Structure; D010777:Photochemistry
chemical_list: D000475:Alkenes; D000480:Alkynes; D003503:Cyclobutanes; D004146:Dioxanes; D006575:Heterocyclic Compounds, 3-Ring