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The Secretary of State for Defence in Her Britannic Majesty's Government

The Secretary of State for Defence in Her Majesty's Government of the

Michael Romer

Georg Weber

Rudolf Eidenschink

Joachim Krause

Ludwig Pohl

Bernhard Scheuble

George W Gray

Kenneth J Toyne

Klaus Bofinger

Gunther Haas

Detlef Pauluth

David Lacey

Lawrence Kam Ming Chan

Hans A Kurmeier

Manfred Kohler

Ernst Felder

Jurgen Seubert

Hartmut Hartner

Claus P Herz

Hans Bardonner

Martina Schmidt

Fernando Del Pino

Wolfgang Fruhstorfer

Joachim Ruger

Klaus-Peter Stahl

Rudolf Eidensschink

Rudolf Fidenschink

Supertwist liquid-crystal displays having excellent properties are obtained using a nematic liquid-crystal mixture based on component A which contains one or more compounds of the formula IIa or IIb: ##STR1## on or more compounds of the formulae IIc to IIe: ##STR2## and one or more compounds of the formula IIf to IIh: and one or more compounds of the formula IIf to IIh: ##STR3## wherein R, R.sup.1, R.sup.2, L, Y, X and n are as defined herein.

Supertwist liquid-crystal display

Cyclohexane derivatives

A process for the production of hydroxyamines of the formula I

Process for the preparation of hydroxyamines

Bicyclohexyls

Liquid crystalline fluorine-containing pyrimidine compounds have the formula I ##STR1## wherein R.sup.1 and R.sup.2 are H, R, OR or OCOR, and one of them can also be CN or F, or, if A is a covalent bond, also one or both of R.sup.1 and R.sup.2 can be 4-R.sup.4 -phenyl or 4-R-cyclohexyl, wherein R.sup.4 is R, OR, cyano, f or OCOR; wherein R is an alkyl group of 1 to 12 C atoms; R.sup.3 is F or, if one of the radicals R.sup.1 or R.sup.2 is F or 4-fluorophenyl, also H; Z is 1,3-pyrimidin-2,5-diyl; and A is 1,4-phenylene, 1,4-cyclohexylene or a covalent bond. Fluorine-containing pyrimidine compounds are useful components of liquid crystal dielectrics for electro-optical display devices.

Fluorine-containing pyrimidine derivatives

Pyrimidine derivatives

Ketones of the formula II ##STR1## with Ar, R.sup.1 and R.sup.2 as indicated below, can be hydroxylated, readily and in high yields, in the .alpha.-position using tetrahalogenomethanes and alkali metal hydroxides under phase-transfer conditions.

Process for the preparation of ketones

Organosilicon compounds

Bicyclohexylethanes

Liquid-crystalline materials can be outgassed by thermal treatment under reduced pressure in a thin-layer evaporator or with additional ultrasonic treatment.

Process for outgassing liquid-crystalline materials

Novel terphenyls having a relatively high clearing point and which are suitable for use in liquid crystal materials or in the preparation of compounds for use in such material are characterized by a formula: ##STR1## wherein: R.sub.1 is selected from H, alkyl, alkoxy, alkylcarbonyl, alkylcarbonyloxy and alkoxycarbonyloxy;

Compounds containing a fluorobiphenylyl group and their use in liquid

Thienothiophene derivatives of the formula I

Thienothiophene derivatives

Hydroterphenyls

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Rodgau, Germany

Michael Romer