Optically active 1,3-dioxolane derivatives carrying a mesogenic radical in the 4-position, a process for their preparation and their use as doping agents in liquid-crystal mixtures

US5651918A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Scherowsky · Berlin, DE
• Jurgen Gay · Berlin, DE
• Rainer Wingen · Hattersheim, DE
• Hans-Rolf Dubal · Königstein, DE
• Claus Escher · Mühltal, DE
• Wolfgang Hemmerling · Pocking, DE
• Yoshio Inoguchi · Tokyo, JP
• Ingrid Muller · Niedernhausen, DE
• Dieter Ohlendorf · Liederbach, DE

Key dates

• Filing date: May 30, 1995
• Grant date: Jul 29, 1997
• Expiry date: May 30, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/588
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Optically active 1,3-dioxolane derivatives which carry a mesogenic radical in the 4-position and have the general formula (I) ##STR1## are suitable for use as doping agents in liquid-crystal mixtures--in particular ferroelectric liquid-crystal mixtures. The symbols in the general formula have the following meanings: PA1 R.sup.1 is composed analogously to the part of the general formula on the right-hand side of X or is an alkyl or alkylene radical which can be substituted, PA1 R.sup.2, R.sub.3 and R.sup.4 are H or alkyl (R.sup.4 is also alkenyl) which can also be substituted [R.sup.2 and R.sup.3, together with the C(2) of the dioxolane ring are also a cycloaliphatic radical or a keto group], J, l and n are zero, 1 or 2 and k and m are zero or 1, subject to the proviso that, if k is zero n is zero and if n is zero m is zero and 1.ltoreq.J+l+n.ltoreq.3, PA1 --A.sup.1, --A.sup.2 and --A.sup.3 are an aromatic, heterocyclic or aliphatic ring system, --M.sup.1 and --M.sup.2 are --CO--O, --0--CO, --CH.sub.2 CH.sub.2, --CH.dbd.CH, --CH.sub.2 O, --OCH.sub.2 or --C.tbd.C and PA1 X is O, S or O--CO--O.