Dicyclopenta[a,d]cyclooctene: A [14]Annulene Containing Two Zero-Atom Cross-Links.

Angew Chem Int Ed Engl 2001 Jul;40(14):2660-2662

Department of Applied Chemistry, Faculty of Engineering Toyama University Gofuku 3190, Toyama 930-8555 (Japan) Fax: (+81) 76-445-6819.

14π-Electrocyclization across the two pentafulvenoid moieties of pentafulvene 1 occurs upon heating to provide dicyclopenta[a,d]cyclooctene 2 [Eq. (1)]. The nonalternant hydrocarbon 2 shows diatropic character and a distinctive absorption spectrum with the longest wavelength maximum at 767 nm.

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http://dx.doi.org/10.1002/1521-3773(20010716)40:14<2660::AID-ANIE2660>3.0.CO;2-6DOI Listing
July 2001

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