Liquid crystalline naphthalene derivatives

US4386007A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Joachim Krause · Dieburg, DE
• Michael C. Romer · Rodgau, DE
• Ludwig Pohl · Darmstadt, DE

Key dates

• Filing date: Dec 5, 1980
• Grant date: May 31, 1983
• Expiry date: Dec 5, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/325
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Liquid crystalline naphthalene derivatives of the formula ##STR1## wherein ring A is 1,4-phenylene, trans-1,4-cyclohexylene or 1,4-cyclohex-1-enylene and ring system BC is 2,6-naphthylene, 3,4-dihydro-2,6-naphthylene or 1,2,3,4-tetrahydro-2,6-naphthylene, with the proviso that A is not 1,4-phenylene when BC is 2,6-naphthylene; and R.sub.1 and R.sub.2, which are identical or different, are each alkyl of up to 8 C atoms or, when the rings to which they are bonded are aromatic, also can be alkoxy, alkanoyloxy or alkoxycarbonyloxy having up to 8 C atoms in each case; or one of R.sub.1 and R.sub.2 also can be CN, halogen, CF.sub.3 or NO.sub.2 are valuable components for liquid crystalline dielectrics.