Organosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixtures

US5348684A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wolfgang Hemmerling · Pocking, DE
• Hans-Rolf Dubal · Königstein, DE
• Claus Escher · Mühltal, DE
• Gerhard Illian · Frankfurt am Main, DE
• Yoshio Inoguchi · Tokyo, JP
• Ingrid Muller · Niedernhausen, DE
• Mikio Murakami · Kakegawa, JP
• Dieter Ohlendorf · Liederbach, DE
• Rainer Wingen · Hattersheim, DE

Key dates

• Filing date: Aug 20, 1992
• Grant date: Sep 20, 1994
• Expiry date: Aug 20, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/406
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The novel silylalkyl or silylalkenyl compounds correspond to the general formula (I) ##STR1## Here the symbols A.sup.1, A.sup.2, A.sup.3 denote aromatic or heteroaromatic molecular units such as 1,4-phenylene or pyrimidine-2,5-diyl which are combined via a single bond (for k, m=0) or via functional groups M.sup.1,M.sup.2 such as CO--O or CH.sub.2 --O; j, k, l, m, n are zero or 1 (j+l+n=2 or 3). The radicals R.sup.2, R.sup.3, R.sup.4, R.sup.5 are hydrogen or alkyl/alkenyl, cycloalkyl, and the radicals R.sup.6, R.sup.7, R.sup.8 have a comparable meaning (hydrogen); R.sup.1 is alkyl/alkenyl or one of the substituents known from LC chemistry such as an .alpha.-haloalkanoic radical. In some cases compounds have wide and polymorphous liquid crystalline phases.