title: Synthesis and characterization of cyclic alkyl tetraynes.
abstract: Cyclic (4a-e) and linear (10) tetraynes have been studied. Macrocycles 4a-e are unstable to isolation as neat compounds, but 4b-e have been characterized in solution. 13C NMR spectroscopy shows a consistent downfield shift of the acetylenic resonances of 4c-e as ring strain increases. UV-vis spectroscopy demonstrates that ring strain has little effect on the HOMO-LUMO gap. X-ray crystallography of tetrabromoolefin 6b confirms the monomeric constitution of the precursors.
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton AB T6G 2G2, Canada.
authors.forename: Andreea
authors.initials: A
authors.lastname: Spantulescu
authors.forename: Thanh
authors.initials: T
authors.lastname: Luu
authors.forename: Yuming
authors.initials: Y
authors.lastname: Zhao
authors.forename: Robert
authors.initials: R
authors.lastname: McDonald
authors.forename: Rik R
authors.initials: RR
authors.lastname: Tykwinski