title: Access to an excited state via the thermal ring-opening of a cyclopropylidene.
abstract: [reaction: see text] Thermal generation of singlet excited states is unusual in organic chemistry. The potential energy surface for the thermal ring-opening of 4-methylene-bicyclo[3.1.0]hex-2-ene-6-ylidene (1) was calculated at the CASSCF level of theory and found to produce alpha,3-didehydrotoluene in its biradical ground state (S(0)) and/or its zwitterionic excited state (S(1)).
authors.affiliation: Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA.
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Cremeens
authors.forename: Barry K
authors.initials: BK
authors.lastname: Carpenter