Patent number: 4874545
Abstract: The novel compounds are chiral esters of .alpha.-substituted phenylalkanoic acids and mesogenic hydroxy compounds, the symbols in the general formula (I) ##STR1## being defined as follows: MO=molecular radical of a mesogenic hydroxy compound MOH after removal of one H, the radical MO being expressed by the general formula (II)R.sup.2 --(A.sup.1).sub.n1 --(B--).sub.n2 (A.sup.2).sub.n3 --O (II)whereR.sup.2 =straight-chain or branched (C.sub.1 -C.sub.12)-alkyl, it being possible for one or two non-adjacent CH.sub.2 groups to be replaced by O and/or S atoms, or, if n1=1, also F, Cl, Br, CN or CF.sub.3,A.sup.1, A.sup.2 =independently of one another 1,4-phenylene, diazine-2,5-diyl, diazine-3,6-diyl, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl or 1,4-bicyclo(2,2,2)octylene, it being possible for these groups also to be at least monosubstituted by F, Cl, Br, CN, CF.sub.3 and/or (C.sub.1 -C.sub.12)-alkyl (one or two non-adjacent CH.sub.
Type:
Grant
Filed:
June 12, 1987
Date of Patent:
October 17, 1989
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Gerd Heppke, Gunter Scherowsky, Christian Bahr, Lutz Lehmann