The 7-formylnorcaradiene (1; X = O, R = Me) rearranges at 40 °C to the dihydrobenzofuran (4; X = O, R = Me) and the 7-vinylnorcaradiene (1; X =E-CHCO2Et, R = Me) rearranges to the dihydroindene (9), evidence for 3,5-rather than 1,3-sigmatropy in both processes.
P. J. Battye, D. W. Jones and H. P. Tucker, J. Chem. Soc., Chem. Commun., 1988, 495 DOI: 10.1039/C39880000495
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