| abstract |
Liquid crystalline ethane derivatives by the described method in order to form liquid crystalline compositions with known liquid crystalline compounds have a general formula I: <IMAGE> I wherein, if ring A idicates a 1,4-substituted benzene ring, then ring B indicates 1.4-substituted benzene ring or 1.4-trans-substituted cyclohexane ring or 1.4-substituted bicyclo[2,2,2]octane ring or 2.5-substituted pyrimidine ring or 2.5-substituted 1.3- dioxane ring, or if ring B indicates a 1.4-substituted benzene ring, then A indicates 1.4-trans-substituted cyclohexane ring or 1.4-substituted bicylo[2,2,2]octane ring or 2.5-substituted pyrimidine ring or 2.5-substituted 1.3-dioxane ring, and R indicates a normal alkyl chain CnH2n+1 or a non-branched alkoxy group CnH2n+1O or an alkylcarboxylic group CnH2n+1COO or an alkyl carbonato group CnH2n+1OCOO or a branched alkyl chain CH3-CH2-CH(CH3)-(CH2)k- or a branched alkoxy group CH3-CH2-CH(CH3)-(CH2)k-O, where n is an integer number and assumes values from 1 to 12, k is an integer number and assumes values from 1 to 3 and l and m assume values 1 or 0 fulfilling the condition that l+m>0, and if ring A denotes 1.4-disubstituted bicyclo[2,2,2] octane ring also l+m=0. Liquid crystalline compositions containing the compound of formula I are characterized by low viscosity and are applied in displays. |