1,3-dioxane derivatives, methods of preparation and liquid cryst

Details 1,3-dioxane derivatives, methods of preparation and liquid cryst 1,3-dioxane derivatives, methods of preparation and liquid cryst

1990-05-25

1993-08-24

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

549369, 25229901, C09K 1934, C09K 1952, C07D31906, C07D40700

Patent

active

052385990

ABSTRACT:
Trans-2-phenyl-5-trans-4'-alkylcyclohexyl-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group of 1 to 10 carbon atoms, A is a single covalent bond or a --CH.sub.2 CH.sub.2 -- group, X is F or CN, Y is F if X is CN or Y is H or F if X is F, and the cyclohexane ring and the 1,3-dioxane ring are trans isomers. The 1,3-dioxane derivatives have large positive dielectric constant anisotropy (.DELTA..epsilon.), small birefringence (.DELTA.n) and have good compatibility with other liquid crystal compounds. The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.

REFERENCES:
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E. Kleinpeter et al., Liquid-Crystalline Behaviour of 2,5-Disubstituted 1,3-Dioxanes Subject to the Flexibility of Terminal chains, Tetrahedron, vol. 44 6, pp. 1609-1612 (1988).

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