The 2,2′,6,6′-tetra-arylbipyran-4-ylidenes (1b) and (1c), disc-like molecules with a novel core and four n-alkyl side chains, exhibit a discotic mesophase which allows either four- or two-fold symmetry.
R. Fugnitto, H. Strzelecka, A. Zann, J. Dubois and J. Billard, J. Chem. Soc., Chem. Commun., 1980, 271 DOI: 10.1039/C39800000271
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