| 摘要 |
<p>Chiral, nonracemic compounds of the general formula: R'-Ar-O-CH2X-(CHY)n-(CHZ)m-R wherein m and n are either both zero, both equal one or n is equal to one and m is equal to zero, X and Y and Z are halogens, R' is an alkyl, alkoxy, alkenyl, thioalkyl, thioether, ether, or alkylsilyl group containing three to fifteen carbon atoms, and R is an alkyl group having one to fifteen carbon atoms and where Ar is: -Aa-(E)e-Bb-(F)f-Dd- where A, B and D independently of one another are aromatic rings which are selected from the group consisting of a phenyl, a pyridine ring, a pyrimidine ring, a pyridizine ring, a pyrazine ring and a thiadiazole ring, wherein a, b and d are intergers from 0-3 such that a + b + d = 2-3, where E and F independently of one another are linking groups selected from the group consisting of a -CH2-CH2-, -CH2-O-, -CH2-S-, -O-CH2, -S-CH2, -OO-C- or -COO- wherein e and f can be 1 or 0. When e and/or f is 0, the adjacent aromatic rings are linked by a carbon-carbon single bond. Preferably e and f are both 0 or one of e or f is 1, and wherein * indicates a chiral, which are useful as ferroelectric liquid crystal compoenents having high polarization are described.</p> |
