title: Formal [(2+2)+2] and [(2+2)+(2+2)] nonconjugated dienediyne cascade cycloadditions.
abstract: [reaction: see text] Fluoranthene 2 and heptacycle 3 are easily accessible from the reaction of diyne 1 and norbornadiene (NBD) in the presence of the rhodium catalyst. The unusual [(2+2)+(2+2)] adduct 3 was confirmed by the X-ray crystal structure analysis.
authors.affiliation: Institute of Organic Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
authors.forename: Yao-Ting
authors.initials: YT
authors.lastname: Wu
authors.forename: Anthony
authors.initials: A
authors.lastname: Linden
authors.forename: Jay S
authors.initials: JS
authors.lastname: Siegel