TRIMETHYLENEMETHANES EXTENDED WITH AROMATIC RINGS

Hexaaryl substituted trimethylenemethane dications and dianions extend ed with thiophenes or benzenes have been synthesized through regiosele ctive lithiation and functionalization of the corresponding triarylmet hanes. These molecules are featured by highly tetrapolar properties an d long-wavelength absorption in near infrared region. While thiophene- extended dications and dianions are considerably stable, benzene-exten ded dications are very sensitive to acidity of media to exist in equir ibrium with protonated trications.