transfer. The intermediate [4.4]paracyclophane radicalcations 7·+ and 12·+ are apparently also localized radicalcations. The close interplanar distance between the two π-moieties, however, facilitates their mutual contacts. In 7·+, the intramolecular electron transfer becomes fast on the ESR time scale at room temperature; in 12·+ the transfer is fast over the temperature range 200−300 K.