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| | 4,6-Dehydro-2-cyclohexenone Zwitterion |
 | | The compound has to either be zwitterionic or biradical in nature. |
 | | The CISD/cc-pVDZ natural orbital occupations clearly rule out a biradical character of the wavefunction, and, therefore, the species is zwitterionic in nature. |
 | | Thus, the main resonance structures are zwitterionic and the seven possible resonance structures are depicted in the following Scheme. |
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