Tetracyclic and pentacyclic compounds, and their use in liquid-crystalline media

US6635318B2 · kind B2 · utility

Assignee

• MERCK PATENT GESELLSCHAFT MIT BESHRANK TER HAFTUNG · DE

Inventors

• Peer Kirsch · Darmstadt, DE
• Joachim Krause · Dieburg, DE
• Georg Lüssem · Ober-Ramstadt, DE
• Dagmar Klement · Groß-Zimmern, DE

Key dates

• Filing date: Aug 13, 2001
• Grant date: Oct 21, 2003
• Expiry date: Nov 12, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3001
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is a tetracyclic compound of the formula I in whichR1, R2 are each, independently of one another, an alkyl or alkenyl radical having up to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3, or monosubstituted by halogen. One or more CH2 groups in these radicals may also, in each case independently of one another be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO— or —O—CO—O— such that the O atoms are not linked directly to one another. Z is —OCF2—, —CF2O— or a single bond. L1, L2, L3, and L4 are each, independently of one another, H or F. m is 1 or 2. Similar compounds, as well as liquid-crystalline media having these compounds, are also disclosed.