Liquid-crystalline compounds containing tricyclo(4.4.0.0^3,8)-decane (twistane) and spiro (3.3) heptane ring systems

Nematic Liquid Crystals: Synthesis of Nematic Liquid Crystals

“…Cubanes, 4, [89,90] and bicyclo[ 1.1. llpentanes, 5 , [91, 921 provide a collinear arrangement of bridgehead bonds but they are poor nematogens because the angular nature of the core is not conducive to lateral, molecular associations. Derivatives of 6 [93], 7 [94,95], 8 [93 -951,9 [94,96], and 10 [97, 981 have also produced nematic phases. Many methods of esterification have been reported and it is normally a straightforward procedure to prepare an ester from the carboxylic acid and the phenol or alcohol.…”

Synthesis of Indole Substituted Twistenediones from a 2-Quinonyl Boronic Acid

“…In sharp contrast to adamantane analogues which have received huge attention, these cage-shaped systems have been the subject of limited studies. To date, theoretical investigations , and applied studies directed toward determining their behavior as liquid crystals have been reported. The D 2 symmetry makes them ideal models to evaluate the chiroptical properties of twist-boat type structures .…”