9-Vinyl- and 9-aryl-tricyclo[3.3.1.02,8]nona-3,6-dien-9-olates (1c—h) underwent the retro-Diels-Alder reaction to give cycloheptrienes (2c—h) in excellent yields, indicating that it is not necessary for the fragmented 4π component to be incorporated into an aromatic nucleus.
T. Miyashi, A. Ahmed and T. Mukai, J. Chem. Soc., Chem. Commun., 1984, 179 DOI: 10.1039/C39840000179
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