Merck Patent Gesellschaft MIT Beschrankter Haftung

Graham Smith

David Coates

Volker Reiffenrath

Simon Greenfield

Reinhard Hittich

Ulrich Finkenzeller

Ian Charles Sage

Shirley Ann Marden

Stefan Wilhelm

David W Baxter

Eike Poetsch

Dieter Dorsch

Joachim Krause

Herbert Plach

Ekkehard Bartmann

Hans A Kurmeier

Volker Meyer

Klaus P Stahl

The invention relates to an electrooptical liquid crystal system

Electrooptical liquid crystal system

Disclosed are compounds of formula I ##STR1## wherein R is C.sub.1-12 -alkyl or halogenoalkyl wherein one or two non-adjacent CH.sub.2 groups are optionally replaced by --O--,

Fluoro-chloro-benzene derivatives

Biphenylylethanes of the formula I ##STR1## in which one of the radicals R.sup.1 and R.sup.2 is X and the other radical R.sup.1 or R.sup.2 is R--Y-- where

Biphenylethanes and liquid-crystalline phase

The invention relates to fluoro-chloro-benzene derivatives of the formula I ##STR1## wherein R denotes an alkyl or halogenoalkyl residue of up to 12 C atoms wherein one or two non-adjacent CH.sub.2 groups may also be replaced by -0- and/or -HC=CH-, the radical A is a ring of the formula (1) or (2): ##STR2## Q is a bivalent radical of the formula (1) or (2) or a single bond or--if radical A denotes trans-1,4-cyclohexylene--is also a bivalent radical of the formulae (3), (4) or (5): ##STR3## and L.degree., L.sup.1 and L.sup.2 are each independently H or F, with the proviso that at least one of L.degree., L.sup.1 and L.sup.2 present in the molecule denotes F.

Electrooptical liquid-crystal system

Phenyldioxanes

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Poole, United Kingdom

Graham Smith