Das ESR.‐Spektrum der 1,2,3‐Trihydropyrenyls

Abstract
The two isomeric tetrahydropyrenes II and III have been prepared by Birch reduction of pyrene. Air oxidation of either compound yields 1,2,3‐trihydropyrenyl (1,9‐trimethylene‐phenalenyl; IV); its ESR. hyperfine structure is shown to be closely related to that of phenalenyl.