Abstract: Sixteen lateral multi-fluorine substituted internal alkynes liquid crystals were synthesized via a series of reactions including substituted phenylboronic acidation, Suzuki cross-coupling, Sonogashira cross-coupling and iodination using 4-bromo-alkylbenzene and 4-bromo-2,3-difluoro-phenol precursors. The structures of the products were characterized by means of IR, NMR and MS. The differential scanning calorimetric, polarizing microscope and Abbe refractometer, were used to investigate their properties. The results demonstrate that the compounds possess low melting point, wide phase transition interval and high optical anisotropy value(Δn＞0.3). The obtained liquid crystals might find broad potential applications in dual-frequency liquid crystals.

Key words: lateral multi-fluorine substituted, internal alkynes, dual-frequency liquid crystals