Abstract: The esr spectra of a number of bicyclo [2.2. l] heptane-2, 3-semidiones and bicyclo [3.2. l] octane-2, 3-semidiones are reported, including tri-and tetracyclic derivatives. Assignments of hyperfine splitting constants have been made by studies of deuterium and alkyl derivatives. A number of long range transoid, coplanar interactions between protons and the electron spin are reported, discussed, and analyzed in terms of valence bond ...
![Bicyclo[2.2.1]hept-2-ene,7-bromo-, anti- (9CI) Structure](https://image.chemsrc.com/caspic/247/22365-94-2.png)