Liquidcrystalline cyclohexylbenzene derivatives their manufacturing and novel nematic admixtures containing same.

摘要

New compounds of the general formula I: wherein R<1> is a normal or branched alkyl chain H2n+1Cn- or a normal or branched alkoxy group H2n+1CnO-, n being an integer number from 1 to 12; X is a bridging group from the set: -COO-, -OCO-, -CH2O-, -OCH2-, -COCH2-, -CHOHCH2-, -CH=CH-,-CH2CH2-, -CHClCH2-, -CHCNCH2-, -CHBrCH2-, -CHFCH2-, -CHOCH3CH2-; Y is a terminal group from the set: -NO2, -NH2, -NCS, -Cl, -Br, -F; the cyclohexane rings are trans-1,4-disubstituted ones and the benzene rings are 1,4-disubstituted ones, and besides one of them may contain sometimes additionally a fluorine atom in position 2 or 3, k and l are integer numbers from the set: 0, 1, 2 fulfilling the condition that k+1=2 or 3; besides, if X denotes the -COO- or -OCO- group, then k+1 also may assume the value of 1 , their manufacture and liquid crystalline admixture containing them and use for electro-optical devices as dielectrics are described.