| 摘要 |
NEW MATERIAL:An ester compound expressed by formula I (R is 1-10C alkyl; ring A is expressed by formula IV or V; X is F or Cl; Y is F, Cl or CN). EXAMPLE:3'-Fluoro-4'-cyanophenyl 2-(trans-4-ethylcyclohexyl)-5-nicotinate. USE:Useful as a liquid crystal composition for display elements, capable of exhibiting a nematic liquid crystal phase, having improved compatibility with other liquid crystal compositions and increasing the clear point by adding the compound expressed by formula I, increasing a dielectric anisotropic value DELTAepsilonand showing effect on drop of driving voltage of display elements of liquid crystal compositions. PREPARATION:As shown in the reaction formula, a 2-substituted-5-nicotinic acid expressed by formula II is linked to a compound expressed by formula III in methylene chloride solvent using dicyclohexylcarbodiimide to afford the aimed compound expressed by formula I.
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