| 摘要 |
<p>Dioxane derivatives for use as components in liquid crystal devices (LCDs) of general formula (A), wherein X is CH or B; R1, R2 are each A?1, OA1, OCOA2¿, or COOA2; A1 is a straight or branched chain alkyl group containing from 1 to 20 carbon atoms and may be substituted with one or more F or CN. A2 is a straight or branched chain alkyl group containing from 1 to 20 carbon atoms and may be substituted with one or more F or CN and if straight may be unsubstituted. Y?1, Y2, Y3¿ may each be (CH¿2?)p, (CH2)pCOO or OCO(CH2)p; p is from 0 to 10, n is 0 or 1, m is 0 or 1, either or both of Z1 and Z2 are F and, when not F, are H; Y?4¿ is a covalent bond or, when n is 0, may be (a) LCDs, containing the devices exhibit very fast switching speed, bi-stable characteristics, enhanced greyscale and storage capabilities and a wide viewing angle.</p> |
