| 摘要 |
<p>The invention relates to pyridine derivatives of formula (I), wherein Y is selected from F, Cl, -CF3, -OCF3, or -O CHF2; Z?1 and Z2¿ are selected from -CH¿2?-CH2-, -CO-O-, -O-CO-, -CH2-O-; O-CH2-, -C=C- or a single bond. A?1 and A2¿ are rings; X=H, or in case of Y=F or Cl, also F; n=0,1 or 2; and R1=alkyl wherein one or two non-adjacent CH¿2?-groups may be replaced by -O-, -O-CO-, -CO-O- and/or -CH=CH-which are used in liquid cristalline mixtures.</p> |
