Theoretical considerations indicate that in 4n π-electron systems the triplet state in rings of 4n atoms is less stable with respect to the lowest singlet than in the isoelectronic systems consisting of 4n± 1 or 4n± 2 atoms.
W. T. Borden, J. Chem. Soc. D, 1969, 881 DOI: 10.1039/C29690000881
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