Thienothiophene derivatives

US4639328A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Joachim Krause · Dieburg, DE
• Michael C. Romer · Rodgau, DE
• Georg Weber · Langen (Hessen), DE

Key dates

• Filing date: Nov 26, 1984
• Grant date: Jan 27, 1987
• Expiry date: Nov 26, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3491
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Thienothiophene derivatives of the formula I EQU R.sup.1 --(A.sup.1).sub.m --Z.sup.1 --A--(Z.sup.2 --A.sup.2).sub.n --R.sup.2 I in which R.sup.1 and R.sup.2 are each H or an alkyl group having 1-12 C atoms, in which, furthermore, one or two non-adjacent CH.sub.2 groups can be replaced by O atoms, --CO-- or --CH.dbd.CH-- groups, or are each F, Cl, Br, CN, --COOR or --O--COR, A.sup.1 and A.sup.2 are each 1,4-phenylene, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl, tetrahydropyran-2,5-diyl, pyridazine-3,6-diyl or the corresponding N-oxide, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or pyrimidine-2,5-diyl groups which are unsubstituted or substituted by one or two F, Cl or Br atoms and/or CN groups and/or CH.sub.3 groups, A is a group of the formula 1 or 2 ##STR1## which is unsubstituted or substituted by one or two Cl and/or Br atoms, Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O-- or a single bond, R is an alkyl group having 1-10 C atoms, m is 1 or 2 and n is 0 or 1, and where m is 2, the two groups A.sup.1 can be identical or different, can be used as components of liquid crystalline phases.