2,3-difluorohydroquinone derivatives

Abstract

Abstract 2,3-difluorohydroquinone compounds of the formula I ##STR1## in which R 1 and R 2 , in each case independently of one another, are alkyl having 1 to 15 C atoms or alkenyl having 3 to 15 C atoms which are unsubstituted, monosubstituted by cyano or at least monosubstituted by fluorine or chlorine, it also being possible for one CH 2 group in these radicals to be replaced by --O--, --CO--, --CO--O--, --O--CO-- or --O--CO--O--, A 1 , A 2 and A 3 , in each case independently of one another, are (a) trans-1,4-cyclohexylene, in which, in addition, one or two non-adjacent CH 2 groups may be replaced by --O-- and/or --S--, (b) 1,4-phenylene, in which, in addition, one or two CH groups may be replaced by N, or (c) a radical from the group comprising piperidine-1,4-diyl, 1,4-bicylo (2,2,2)-octylene (sic), 1,3,4-thiadiazole-2,5-diyl, napththalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, it being possible for the radicals (a) and (b) to be monosubstituted or polysubstituted by F, Cl, CH 3 or CN, Z 1 is --CO--O--, --O--CO--, --CH 2 CH 2 --, --OCH 2 --, --CH 2 O--, --C.tbd.C-- or a single bond, Q 1 and Q 2 , in each case independently of one another, are --CO-- or --CH 2 --, m and n are each 0, 1 or 2, and (m+n) is 0, 1 or 2, are suitable as components of liquid-crystalline phases.

Inventors

• 👤 Volker Reiffenrath
• 👤 Joachim Krause
• 👤 Andreas Wachtler
• 👤 Georg Weber
• 👤 Thomas Geelhaar
• 👤 David Coates
• 👤 Ian C. Sage
• 👤 Simon Greenfield

Bibliographic Details