| 摘要 |
<p>New Optically active 5-ring compounds with terminal chiral 1,3-dioxan-2-yl groups have the formula (I): in which R<1>, R<2> = alk(en)yl, in which 1 or 2 non-adjacent methylene groups may be replaced by -O-, -COO- and/or -OOC- and/or hydrogen atoms may be replaced by fluorine, chlorine or cyano; one of rings A, B and C = pyridin-2,5-diyl, pyrimidin-2,5-diyl or 1,4-phenylene, optionally with 1 or 2 F substituents, and the other 2 rings = trans-1,4-cyclohexylene or 1,4-phenylene, optionally with 1 or 2 F substituents; Z<1>, Z<4> = a single bond, -CH2CH2-, -CH2O-, -OCH2-, -C=C-, -(CH2)4-, -(CH2)3O-, -O(CH2)3-, -CH=CH-CH2O-, -O-CH2-CH=CH-, -CH=CH-(CH2)2- or -(CH2)2CH=CH- such that the oxygen (O) atom is not linked directly to the chiral dioxane ring; Z<2>, Z<3> = a single bond, -CH2-CH2-, -O-CH2-, -CH2-O-, -COO-, -OOC-, -C=C- -(CH2)4-, -O(CH2)3-, -(CH2)3O-, -CH=CH-CH2O-, -OCH2-CH=CH-, -(CH2)2-CH=CH- or -CH=CH-(CH2)2-; R*, S* = the relative configurations of the chiral carbon (C) atoms. Also claimed are: (i) liquid crystalline (LC) mixtures containing at least 2 components among which at least 1 is an optically active compound (I); and (ii) and electro-optical devices containing (I).</p> |
