Dicyanodiaryl-p-quinodimethanes : An efficient synthesis using a new dilithium reagent and their solvent-dependent properties

Article abstract of DOI:10.1246/cl.1997.1055

A series of 7,7-dicyano-8,8-diaryl-p-quinodimethane are readily prepared by the reaction of 4-lithiophenyldicyanomethyl-lithium with diaryl ketones; the 8-(4-dimethylaminophenyl) compounds thus obtained show solvent-dependent absorption spectra and bond rotation of the exocyclic double bonds and form a head-to-tail dimeric structure in the crystal.