Liquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixtures

US4891151A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Rainer Wingen · Hattersheim, DE
• Hans-Rolf Dubal · Königstein, DE
• Claus Escher · Mühltal, DE
• Wolfgang Hemmerling · Pocking, DE
• Ingrid Muller · Niedernhausen, DE
• Dieter Ohlendorf · Liederbach, DE

Key dates

• Filing date: Sep 16, 1988
• Grant date: Jan 2, 1990
• Expiry date: Sep 16, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3458
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Liquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixtures The phenylpyrimidinyl trans-cyclohexanecarboxylates of the general formula ##STR1## form a smectic C phase besides a relatively broad nematic phase when R.sup.1 denotes an alkyl radical having 10 to 16 carbon atoms, in particular 11 to 16 carbon atoms, or an alkoxy radical having 8 to 14 carbon atoms, and R.sup.2 denotes an alkyl radical having 2 to 9 carbon atoms. They are therefore particularly suitable as components of liquid-crystalline mixtures having a smectic C phase since they induce a relatively broad nematic phase or extend a narrow nematic phase which is present and extend the temperature range of the smectic C phase to low temperatures, but in particular to high temperatures.