A substituent effect on the activation energy for the cyclopropylcarbene → olefin + acetylene ring cleavage in two bicyclic systems implies charge transfer from cyclopropane at the transition state.
S. S. Olin and R. M. Venable, J. Chem. Soc., Chem. Commun., 1974, 104 DOI: 10.1039/C39740000104
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