Evidence is presented for a mechanism in which ionisation of a pyrazoline permits a ring expansion and then extrusion of nitrogen in an electrocyclic process consistent with retention of stereochemistry by the resulting cyclopropane.
M. J. Begley, F. M. Dean, L. E. Hughton, R. S. Johnson and B. K. Park, J. Chem. Soc., Chem. Commun., 1978, 461 DOI: 10.1039/C39780000461
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