Veb Werk Fur Fernsehelektronik Im Veb Kombinat Mikroelektronik

Veb Werk Fuer Fernsehelektronik Im Veb Kombinat Mikroelektronik

Adelbert Wiegeleben

Dietrich Demus

Horst Zaschke

Hans-Joachim Deutscher

Hans-Matthias Vorbrodt

Sabine Richter

Wilfried Fuchs

2-Substituted-5-(1-alkyl-piperid-yl)-1,3-dioxanes of the formula I ##STR1## wherein R= ##STR2## R.sup.1 =--C.sub.n H.sub.2n+1, --OC.sub.n H.sub.2n+1, --OOCC.sub.n H.sub.2n+1, --COC.sub.n H.sub.2n+1, --OOCOC.sub.n H.sub.2n+1, --F, --Cl, --Br, --I, --NO.sub.2, --CN --(CH.sub.2).sub.2 CN, ##STR3## and n=1 to 10, are novel liquid crystalline compounds, which can be produced in high yields by means of reacting 2-(1-alkyl-piperid-4-yl)-propane-1,3-diols with aldehydes in the presence of acid catalysts, such as p-toluenesulfonic acid, mineral acids and Lewis acids. Because of their high thermal and chemical stability, which is also transferred to mixtures, the compounds of the formula I are very well suited for utilization in optoelectronic displays.

Liquid crystalline 2-substituted-5-(1-alkyl-piperid-4-yl)-1,3-dioxanes

What is described is an improved opto-electronic component and display which uses novel liquid crystal nematic substances for the control of the light transmission and for the display of numbers symbols and images. The novel nematic liquid crystal substances herein, which exhibit high clearing temperatures, low working temperatures and rapid switching times, are 7-alkyl-perhydrophenanthren-2-carboxylic acids and esters thereof.

Liquid-crystal nematic substances

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Zorbig, Germany

Adelbert Wiegeleben