| 摘要 |
<p>Liquid crystalline alkenyl cyclohexane compounds of formula (I) having a nematic phase over a broad temperature range, a higher elastic constant ratio K33/K11 and a lower viscosity, liquid crystal compositions comprising the above compounds and liquid crystal display elements using the liquid crystal compositions. <CHEM> wherein R1 is an alkyl group of 1-15 carbons, an alkenyl group of 2-15 carbons or an alkyl or alkenyl group in which at least one of non-adjacent methylene groups (-CH2-) is replaced by -O-, -S-, -C IDENTICAL C- or -COO-; R2 is a hydrogen atom or an alkyl group of 1-10 carbons; m is 0-5; when m is 2 or more, any one methylene group in -(CH2)m- may be replaced by -O-; and the rings A1, A2 and A3 are independently a 1,4-cyclohexylene, a cyclohexene-1,4-diyl or a 6-membered ring group, one or two -CH2- groups in said rings optionally replaced by -O- or -S-.</p> |
