Abstract
Three series of α‐methylstilbene‐tolane liquid crystals, 4‐[2‐(4‐alkylphenyl)‐1‐ethynyl]‐4′‐fluoro‐α‐methylstilbene (3a–3e), 4‐[2‐(4‐alkylphenyl)‐1‐ethynyl]‐2′‐methyl‐4′‐fluoro‐α‐methylstilbene (4a–4e) and 4‐[2‐(4‐alkylphenyl)‐1‐ethynyl]‐3′‐methyl‐4′‐fluoro‐α‐methylstilbene (5a–5e), were synthesized and their phase transition temperatures characterized. All the α‐methylstilbene‐tolane liquid crystals exhibit an enantiotropic nematic phase. Compounds 5a–5e, which contain a lateral methyl group at the 3 position of the middle phenyl ring, display low melting points, a wide nematic range and a small enthalpy of fusion. Their potential applications for displays and laser‐beam steering are noted.
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