| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new tetralin which can largely lower threshold voltage without deteriorating responsibility and is useful for liquid crystal displays. SOLUTION: A compound of formula I [R is a 1 to 20C alkyl, an alkoxy, an alkoxyalkyl, an alkenyl or the like; (a) is 0 or 1; the ring A and the ring B are each trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, pyridine-2,5-diyl or the like; L, M are each CH2CH2, CH=CH, CH2O, COO or the like; X1 to X3 are each H or F; Z is H, F, Cl, a (substituted) 1 to 20C alkyl or the like]. For example, 2-[2-(trans-4-propylcyclohexyl)ethyl]-6- fluoro-1,2,3-tetrahydronaphthalene. The compound of formula I is obtained, for example, by reacting a compound of formula II with a compound of formula III in the presence of Pd/C in a hydrogen pressure.
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