Chiral esters formed from .alpha.-substituted carboxylic acids and mesogenic hydroxyl compounds, and their use as dopants in liquid-crystalline phases

US4855429A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gerd Heppke · Berlin, DE
• Christian Bahr · Berlin, DE
• Ingrid Muller · Niedernhausen, DE
• Dieter Ohlendorf · Liederbach, DE
• Rainer Wingen · Hattersheim, DE

Key dates

• Filing date: May 28, 1987
• Grant date: Aug 8, 1989
• Expiry date: May 28, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3463
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The novel compounds are chiral esters formed from .alpha.-substituted carboxylic acids and mesogenic hydroxyl compounds of the general formula (I) ##STR1## in which the symbols have the following meaning: MO=molecular radical of a mesogenic hydroxyl compound MOH after removing an H, the radial MO being expressed by the general formula (II): EQU R.sup.2 --(A.sup.1).sub.n1 --(B--).sub.n2 (A.sup.2).sub.n3 --O(II) PA0 where the meaning of PA1 R.sup.2 is a straight-chain or branched (C.sub.1 -C.sub.12)alkyl or alkenyl, it being possible for one or two nonadjacent CH.sub.2 groups to be replaced by O and/or S atoms, or if n1=1, also F, Cl, Br or CN, PA1 A.sup.1, A.sup.2 are, independently of each other, 1,4-phenylene, pyrimidine-2,5-diyl, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl, or 1,4-bicyclo(2,2,2)octylene, it being possible for said groups to be substituted at least singly by F, Cl, Br, CN and/or (C.sub.1 -C.sub.12)alkyl (optionally, one or two nonadjacent CH.sub.2 groups are replaced by O and/or S atoms), PA1 B is CO--O, O--CO, CH.sub.2 --CH.sub.2, OCH.sub.2, CH.sub.2 O, CH.dbd.N, N.dbd.CH, N.dbd.N N(O).dbd.N, PA1 n1, n2, n3 are, independently of each other, 0, …