1,2,2,2-tetrafluoroethyl ethers, and liquid-crystalline medium

US5643495A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Ekkehard Bartmann · Langen (Hessen), DE
• Ulrich Finkenzeller · Plankstadt, DE

Key dates

• Filing date: Sep 12, 1995
• Grant date: Jul 1, 1997
• Expiry date: Sep 12, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,2,2,2-Tetrafluoroethyl ethers of the formula I EQU R--(A.sup.1 --Z.sup.1).sub.m --A.sup.2 --Z.sup.2 A.sup.3 --O--CHF--CF.sub.3(I) are suitable as components of liquid-crystalline media wherein PA1 R is H, a substituted or unsubstituted alkyl or alkenyl radical having 1 to 15 carbon atoms, PA1 A.sup.1 and A.sup.2 are each, independently of one another, a PA2 (a) trans-1,4-cyclohexylene radicals and derivatives thereof in which, in addition, one or more non-adjacent CH.sub.2 groups is optionally replaced by --O-- and/or --S--, PA2 (b) 1,4-phenylene radicals and derivatives thereof in which, in addition, one or two CH groups is optionally replaced by N, or PA2 (c) radical from the group consisting of 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, wherein radicals (a) and (b) are optionally substituted by one or two fluorine atoms, PA1 Z.sup.1 and Z.sup.2 are each, independently of one another, --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, and one of the radicals Z.sup.1 and Z.sup.2 is optio…