Ring A 1,4-Phenylen, Pyridin-2,5-diyl, Pyrimidin-2,5-diyl, trans-1,4-Cyclohexylen oder trans 1,3-Dioxan-2,5-diyl darstellt; Z eine einfache Kovalenzbindung, -CH₂CH₂-, -OCH₂-, -CH₂O-, -(CH₂)₄-, -O(CH₂)₃-, -(CH₂)₃O-, oder, falls Ring A einen gesättigten Ring darstellt, auch die trans-Form von -CH=CH(CH₂)₂- oder -CH=CHCH₂O- bedeutet; X Fluor, Chlor, Cyano, -CF₃, -OCF₃, -OCHF₂, Alkyl, Alkoxy oder Alkoxyalkyl mit 1 bis 6 Kohlenstoffatomen bedeutet; Y¹, Y² unabhängig voneinander Fluor oder Wasserstoff bedeuten ; und R Alkyl, Alkoxy, Alkenyl oder Alkenyloxy mit 1 bzw. 2 bis 12 Kohlenstoffatomen bedeutet, in welchen eine oder zwei miteinander nicht benachbarte CH₂-Gruppen durch Sauerstoff und/oder eines oder mehrere Wasserstoffatome durch Fluoratome ersetzt sein können, deren Herstellung, flüssigkristalline Gemische , die solche Verbindungen enthalten, sowie die Verwendung dieser Verbindungen bzw. Gemische für elektro-optische Zwecke.
摘要:
Ethine derivatives of the formula R1-(A1-Z1)m-A3-C=C-A4-(Z2-A2)n-R2, in which R2 = -OCF3'-OC2F4H or -OC2F5 are suitable as components of liquid crystal phases.
摘要:
Liquid crystal compounds having a high optical anisotropy Δn value and yet a low viscosity which, when added to a liquid crystal composition increase the Δn value without lowering the NI point or raising theviscosity of the composition, are 4-substituted-4′-(1-alkynyl)tolans of the formula: wherein R¹ and R² each represent a C₁-C₈ alkyl group in which one CH₂ group or two non-adjacent CH₂ groups may be replaced by an O atom, -CO- group, -CO-O- group, -O-CO- group or -CH=CH- group; -Ⓐ- represents an unsubstituted 1,4-phenylene group, a 1,4-phenylene having one or two F, Cℓ or Br atoms or CN grups as substituents, a 1,4-cyclohexylene group, a pyrimidine-2,5-diyl group or a 1,3-dioxane-2,5-diyl group; X represents a group -COO-, -OCO-, -CH₂CH₂-, -OCH₂-, -CH₂O- or -CH=CH- or a single bond; n is 0 or 1 (and when n is O, X represents a single bond); and Y is H or F.
摘要:
Liquid crystal compounds having a high optical anisotropy Δn value and yet a low viscosity which, when added to a liquid crystal composition increase the Δn value without lowering the NI point or raising theviscosity of the composition, are 4-substituted-4′-(1-alkynyl)tolans of the formula: wherein R¹ and R² each represent a C₁-C₈ alkyl group in which one CH₂ group or two non-adjacent CH₂ groups may be replaced by an O atom, -CO- group, -CO-O- group, -O-CO- group or -CH=CH- group; -Ⓐ- represents an unsubstituted 1,4-phenylene group, a 1,4-phenylene having one or two F, Cℓ or Br atoms or CN grups as substituents, a 1,4-cyclohexylene group, a pyrimidine-2,5-diyl group or a 1,3-dioxane-2,5-diyl group; X represents a group -COO-, -OCO-, -CH₂CH₂-, -OCH₂-, -CH₂O- or -CH=CH- or a single bond; n is 0 or 1 (and when n is O, X represents a single bond); and Y is H or F.
摘要:
Dérivés d'éthine ayant la formule R1-(A1Z1)m-A3-C=C-A4-(Z2-A2)n-R2, dans laquelle R2 = -OCCF3'-OC2F4H ou -OC2F5 sont utiles comme composants de phases de cristaux liquides.