Attempts to Synthesize Zwitterionic Donor‐Acceptor Cyclophanes: The Diastereomeric 12,15‐Bis(dimethylamino)‐[2](2,5)‐<i>p</i>‐benzoquinono[2]paracyclophanes

Abstract

The wish to study the interaction between the radical electrons prompted synthesis of the donor-acceptor cyclophanes(1)/(1a) and (2)/(2a). The absorption spectra do not permit any decision between structures (1) or (1a) and (2) or (2a); the ESR and 1H-NMR spectra rule out zwitterions with paramagnetic ground states.