Pyrimidine derivatives

US4776973A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Klaus Bofinger · Mühltal, DE
• Michael C. Romer · Rodgau, DE
• Bernhard Scheuble · Alsbach, DE
• Georg Weber · Langen (Hessen), DE

Key dates

• Filing date: Feb 24, 1986
• Grant date: Oct 11, 1988
• Expiry date: Feb 24, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3458
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Pyrimidine derivatives of the formula I EQU R.sup.1 --Pry--A.sup.1 --Z.sup.1 --A.sup.2 -[Z.sup.2 --A.sup.3 ].sub.m --R.sup.2 I in which PA0 R.sup.1 and R.sup.2 each are an alkyl group having 1 to 12 C atoms, in which one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O-- or --CH.dbd.CH--, and one of the radicals R.sup.1 and R.sup.2 are H, F, Cl, Br or CN, PA0 Pyr is pyrimidine-2,5-diyl, PA0 A.sup.1 and A.sup.3 each are 1,4-cyclohexylene, unsubstituted 1,4-phenylene or 1,4-phenylene which is substituted by one or two F and/or Cl atoms and/or CH.sub.3 and /or CN groups, PA0 A.sup.2 is 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 and/or CN groups, PA0 Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 -- PA0 Z.sup.2 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --O--CH.sub.2 -- or a single bond, and PA0 m is 0 or 1, are suitable for preparing liquid crystal phases having steep electro-optical characteristic curves.