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

U.S. Patent Number: 5348684

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.

Inventors: Hemmerling; Wolfgang (Sulzbach, DE), Dubal; Hans-Rolf (Konigstein/Taunus, DE), Escher; Claus (Muhltal, DE), Illian; Gerhard (Frankfurt am Main, DE), Inoguchi; Yoshio (Tokyo, JP), Muller; Ingrid (Hofheim am Taunus, DE), Murakami; Mikio (Konigstein/Taunus, DE), Ohlendorf; Dieter (Liederbach, DE), Wingen; Rainer (Hattersheim am Main, DE)

Assignee: Hoechst Aktiengesellschaft (Frankfurt am Main, DE)

Application Number: 07/932,644

Issued: 1994-09-20

Expired: 2006-09-20

Classes: 252/299.61 ; 252/299.01; 252/299.63; 252/299.64; 252/299.65; 252/299.66; 252/299.67; 556/400; 556/413; 556/424; 556/427; 556/436; 556/437; 556/438; 556/441; 556/445; 556/446; 556/453; 556/454

Field of search: 252/299.1,299.4,299.5,299.61,259.63,299.65,299.66,299.67 556/400,407,413,424,427,436,437,438,440,441,445,453,454

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