The parent [12]annulene is a reactive species with a distorted structure and significant bondlength alternation. It is thus no surprise that it does not exhibit any Hund's rule violations (Figure ). The related [12]annulene-perimeter cyclazine is a well-described case of singlettriplet inversion. However, cyclazine is a symmetric molecule and the nitrogen in the middle adds two π-electrons. With a saturated bridge atom in the middle the perimeter is antiaromatic and we do not find such systems to exhibit Hund's rule violations. Inspired by cyclazine (and certain [14]annulene perimeters), we sample molecules with nitrogen heteroatoms or bridges but nonetheless we do not succeed in finding Hund's rule violations in [12]annulene perimeters beyond cyclazine.