In solution, 3-acetyl-1,2,3-trimethylcyclopent-1-ene (I) undergoes a sigmatropic 1,3-acetyl shift as the major unimolecular reaction in the excited singlet state, and a (thermatically reversible) 1,2-acetyl shift with cyclopropane ring-closure as the predominant triplet state reaction.
E. Baggiolini, K. Schaffner and O. Jeger, J. Chem. Soc. D, 1969, 1103 DOI: 10.1039/C29690001103
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