In 1972, Baird published rules describing aromaticity and antiaromaticity in the lowest triplet excited states of annulenes. The fortieth anniversary of Baird's rules — which are the reverse of Hückel's rules for aromaticity and antiaromaticity in the ground state — ought to be celebrated before 2012 comes to an end.
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Ottosson, H. Exciting excited-state aromaticity. Nature Chem 4, 969–971 (2012). https://doi.org/10.1038/nchem.1518
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DOI: https://doi.org/10.1038/nchem.1518
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