The thermal rearrangement of 2-methylbicyclo[2,1,0]pent-2-ene gives 1-methylcyclopentadiene, rather than the 2-methylcyclopentadiene required by the usually assumed diradical mechanism for this valence isomerization.
J. E. Baldwin and A. H. Andrist, J. Chem. Soc. D, 1970, 1561 DOI: 10.1039/C29700001561
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