Abstract
The radical anions of heptalene and of 1, 7‐methano‐[12]annulene are generated by metal reduction and characterized by means of their ESR‐spectra. Whereas the neutral hydrocarbons are π‐bond localized their corresponding radical anions turn out to be π‐bond delocalized. This could be deduced from an interpretation of the different hyperfine splittings using a simple MO‐model.