Thermal isomerization of cis- and trans-6,9-dimethylspiro[4,4]nona-1,3-diene involves a suprafacial, sigmatropic [1,5]-shift of sp3 carbon, with retention of configuration.
M. A. M. Boersma, J. W. de Haan, H. Kloosterziel and L. J. M. van de Ven, J. Chem. Soc. D, 1970, 1168 DOI: 10.1039/C29700001168
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