Fluorinated oligophenyls and their use in liquid crystal materials

US5273680A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• George W. Gray · Corby, GB
• Michael Hird · Hull, GB
• David Lacey · Hope, GB
• Kenneth J. Toyne · Cudworth, GB
• Volker Reiffenrath · Roßdorf, DE
• Andreas Wachtler · Griesheim, DE
• Joachim Krause · Dieburg, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Thomas Geelhaar · Mainz, DE

Key dates

• Filing date: Mar 9, 1992
• Grant date: Dec 28, 1993
• Expiry date: Mar 9, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/123
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to fluorinated oligophenyls of formula (I), in which a is 0 or 1 and in which the terminal substituents R.sup.1, R.sup.2 and R.sup.3 are each independently an alkyl or alkenyl residue each with up to 15 C atoms, optionally substituted by CN or by at least one halogen atom, and wherein one or more non adjacent CH.sub.2 groups of these residues may be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O--, --O--CO--O-- or --C.tbd.C--, one of the residues R.sup.1 and R.sup.2 may also denote a group of formula (II), any one of the following pairs of lateral substituents are both fluorine: (A, B), (C, D), (D, E), (C, E), (B, C), (D, J), (D, K), (A, C), (C, J), (C', D'), (D', E), (D', A), (C', E), (C', A), (D', J'), (D', K'), (C', J'), (B, G), (A, G), all of the other lateral substituents being hydrogen or fluorine, and to their use as components of liquid crystalline compositions.