HOMA, which is a geometric-based indicator of aromaticity that only takes into account the C–C bond distances, shows an increase of the aromaticity of the 5-MRs when the spin state increases, whereas for the 6-MRs it does not follow a clear trend.
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On the regioselectivity of the Diels-Alder cycloaddition to C<sub>60</sub> in high spin states.
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