Biphenylethanes and liquid-crystalline phase

US5496499A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Eike Poetsch · Mühltal, DE
• Volker Meyer · Groß-Zimmern, DE
• Klaus P. Stahl · Darmstadt, DE
• Volker Reiffenrath · Roßdorf, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Ekkehard Bartmann · Langen (Hessen), DE
• Reinhard Hittich · Seeheim-Jugenheim, DE
• David Coates · Bishop's Stortford, GB
• Simon Greenfield · Poole, GB
• Graham Smith · Poole, GB
• Hans-Adolf Kurmeier · Seeheim-Jugenheim, DE
• Dieter Dorsch · Ober-Ramstadt, DE

Key dates

• Filing date: Jan 12, 1994
• Grant date: Mar 5, 1996
• Expiry date: Jan 12, 2014

Classification

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

Abstract

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 PA1 X is H, halogen, --CF.sub.3, --OCHF.sub.2, --OCF.sub.3, --CN, --NCS or --NO.sub.2, PA1 R is alkyl, fluoroalkyl, alkenyl or oxaalkyl and PA1 Y is O, S, --CO--O--, --O--CO--, --O--CO--O--, a single bond or--in the case where m=1--alternatively trans-1,4-cyclohexylene or ##STR2## m is 1 or 2, Ph is in each case identical or different radicals selected from the group comprising 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene and 3,5-difluoro-1,4-phenylene, PA1 L.sup.3 and L.sup.4 are each H, or one of these radicals is alternatively F, PA1 L.sup.1, L.sup.2 PA1 and L.sup.5 are each H or F, with the proviso that in the case where X=CN or R.sup.1 =--NCS, Y is trans-1,4-cyclohexylene or ##STR3## and/or m=2 and/or one of the radicals L.sup.1, L.sup.2 and L.sup.3 is fluorine and/or Ph--CN is 2-fluoro-4-cyanophenyl or 3,5-difluoro-4-cyanophenyl, are suitable as components of liquid-crystalline phases.