| 摘要 |
NEW MATERIAL:A compound shown by formula I (R is 2-8C n-alkyl; R' is 1-20C n-alkyl or n-alkoxy). USE:An electro-optical display material. An optically active compound. Temperature dependence of threshold voltage can be lessened by adding a small amount of the optically active compound to a nematic liquid crystal composition and occurrence of cross talk phenomena caused by environmental change in high- order partition drive is effectively prevented. The optically active compound is effective for controlling liquid crystal materials. PREPARATION:A 4-iodophenyl-1'-methylalkyl ether shown by formula II is reacted with a 4-alkylphenylacetylene or 4-alkoxyphenylacetylene shown by formula III in a solvent such as diethylamine, etc., in the presence of a catalyst such as bis(triphenylphosphine)palladium (II) chloride, etc., to give a compound shown by formula I.
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