1,4-disubstituted 2,6-difluorobenzene compounds, and a liquid-crystalline medium

US6200654A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Eike Poetsch · Mühltal, DE
• Volker Meyer · Groß-Zimmern, DE
• Volker Reiffenrath · Roßdorf, DE
• Andreas Wachtler · Griesheim, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Hans-Adolf Kurmeier · Seeheim-Jugenheim, DE
• Reinhard Hittich · Seeheim-Jugenheim, DE
• Bernhard Rieger · Langenau, DE
• David Coates · Bishop's Stortford, GB
• Simon Greenfield · Poole, GB
• Robert William Clemitson · Dorchester, GB

Key dates

• Filing date: Aug 25, 1997
• Grant date: Mar 13, 2001
• Expiry date: Aug 25, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

1,4-disubstituted 2,6-difluorobenzene compound of formula I ##STR1## wherein PA1 R is an alkyl or alkenyl radical, PA1 A.sup.1 and A.sup.2, in each case independently of one another, are PA2 (a) a trans-1,4-cyclohexylene radical in which a CH.sub.2 group may be replaced by --O-- and/or --S, PA2 (b) a 1,4-phenylene radical in which a CH group may be replaced by N, PA2 (c) 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, PA1 Z.sup.1 and Z.sup.2 are --CO--O--, --O--CO--, --CH.sub.2 --O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or a single bond PA1 m and n are 0, 1, 2 or 3, PA1 (m+n) is 1, 2 or 3, PA1 X is R or F, Cl, CF.sub.3, --OCF.sub.3, or --OCHF.sub.2, --OCF.sub.5, --CN or --NCS with the proviso that at least one of the radicals A.sup.1 and A.sup.2 present in the molecule is ##STR2## are suitable as components of liquid-crystalline media.