SCHEDULED MAINTENANCE
The [2 + 2] intramolecular photocycloaddition of E and Z olefins to a cyclohexenone has been investigated; it is concluded that the bond to C(3) in the cyclohexenone is formed first to give the diradical intermediates (7a) and (7b).
D. Becker, M. Nagler, S. Hirsh and J. Ramun, J. Chem. Soc., Chem. Commun., 1983, 371 DOI: 10.1039/C39830000371
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