Dicyanodiaryl-p-quinodimethanes : An Efficient Synthesis Using a New Dilithium Reagent and Their Solvent-Dependent Properties
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A series of 7,7-dicyano-8,8-diaryl-<I>p</I>-quinodimethane are readily prepared by the reaction of 4-lithiophenyldicyanomethyllithium 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.
- Chemistry Letters
Chemistry Letters 1997(10), 1055-1056, 1997-10
The Chemical Society of Japan