Optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them

US5354500A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wolfgang Hemmerling · Pocking, DE
• Ingrid Muller · Niedernhausen, DE
• Hans-Rolf Dubal · Königstein, DE
• Claus Escher · Mühltal, DE
• Gerhard Illian · Frankfurt am Main, DE
• Mikio Murakami · Kakegawa, JP
• Dieter Ohlendorf · Liederbach, DE
• Rainer Wingen · Hattersheim, DE

Key dates

• Filing date: Apr 17, 1992
• Grant date: Oct 11, 1994
• Expiry date: Apr 17, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/37
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Use of optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them. Optically active 1,3-dioxolane-4-carboxylic esters and oxirane-2-carboxylic esters of the general formula (I) EQU R(--A.sup.1).sub.j (--M.sup.1).sub.k (--A.sup.2).sub.l (--M.sup.2).sub.m (--A.sup.3).sub.n --X--Ac in which PA1 R.sup.1 is, for example, (C.sub.1 -C.sub.16)-alkyl or (C.sub.1 -C.sub.16)-alkoxy, PA1 A.sup.1, A.sup.2, A.sup.3 are, for example, phenyl or pyrimidine-2, 5-diyl, PA1 M.sup.1, M.sup.2 are, for example, CO--O, CH.sub.2 --CH.sub.2, PA1 j, l are 0, 1, 2, PA1 k, m are 0, 1, PA1 n is 0, 1, 2, PA1 X is O, S and PA1 Ac is ##STR1## in which R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 for example, H or methyl, are particularly suitable doping substances for liquid crystalline mixtures, since they induce a high spontaneous polarization and effect a substantial decrease in the melting point.