| 摘要 |
NEW MATERIAL:A compound shown by formula I (R is 1-8C alkyl; n is 1 or 2; X is one covalent bond, CH2CH2, group shown by formula II, etc.; group shown by formula III Is trans-1,4-disubstituted cyclohexane ring). EXAMPLE:2-{2'-[trans-4''-(trans-4'''-Methylcyclohexyl)cyclohexyl}ethyl }-5-cyanoi ndane. USE:A liquid crystal electro-optical element substance having positive dielectric anisotropy, effective for displaying of watch, electronic calculator, automobile instrument panel, etc. PREPARATION:A compound shown by formula IV is reacted with bromine in the presence of a catalyst such as iron powder, etc., to give a monobromo substance shown by formula V. Then, this compound is reacted with cuprous cyanide to give a compound shown by formula I.
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