A comprehensive series of donor/acceptor substituted tetraethynylethenes has been prepared by palladium‐catalyzed acetylenic coupling. The conjugated C‐atom scaffolds of these remarkably stable compounds are planar, including the substituted phenyl rings. Trends in electronic, optical, and structural properties as a function of degree and pattern of substitution are reported and the effectiveness of intramolecular donor–acceptor interactions via linear conjugation paths and cross‐conjugation paths compared.
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Tykivinski et al. (1996) studied this question.
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