| 摘要 |
NEW MATERIAL:A compound expressed by the formula (R is 1-10C alkyl). EXAMPLE:4-Isothiocyanatophenyl trans-4-propylcyclohexanecarboxylate. USE:A nematic liquid crystal substance having positive dielectric anisotropy, useful as a component used in liquid crystal materials used in TN type liquid crystal display elements, having not so high melting point and not so low clear point, and capable of assuming the nematic phase. PREPARATION:4-Isocyanatophenol which is a well-known compound is reacted with a trans-4-alkylcyclohexanecarboxylic acid halogenide in a basic solvent, e.g. pyridine, to afford the aimed compound expressed by the formula.
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