Chiral esters of alpha -substituted carboxylic acids with mesogenic hydroxyl compounds, and their use as doping substance in liquid-crystalline phases

摘要

The novel compounds are chiral esters of alpha -substituted carboxylic acids and mesogenic hydroxyl compounds, which are characterised by the general formula (I) IMAGE in which the symbols have the following meaning: MO denotes a radical of a molecule of a mesogenic hydroxyl compound MOH after elimination of an H, the radical MO being expressed by the general formula (II R2-(A1)n1-(B-)n2(A2)n3-O in which R2 denotes straight-chain or branched (C1-C12)alkyl, it being possible for one or two non-adjacent CH2 groups to be replaced by O and/or S atoms, or, if n1 = 1, also denote F, Cl, Br or CN, A1 and A2 independently of one another denote 1,4-phenylene, pyrimidine-2,5-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 also being possible for these groups to be at least monosubstituted by F, Cl, Br, CN and/or (C1-C12)alkyl (one or two non-adjacent CH2 groups optionally being replaced by O and/or S atoms), B denotes CO-O, O-CO, CH2-CH2, OCH2, CH2O, CH=N, N=CH, N=N,N(O)=N, n1, n2, n3 independently of one another denote 0, 1 or 2, where n1 and n3 are not simultaneously 0, Y denotes F, Cl, Br, CN or CF3, and R1 denotes branched (C3-C9)alkyl, benzyl or phenyl, where the compounds in which R1 denotes branched (C3-C7)alkyl, benzyl or phenyl, Y denotes F, Cl or Br, R2 denotes (C1-C11)alkoxy, A1 and A2 denote phenyl, n1 and n3 denote 1 and n2 denotes 0 ... Original abstract incomplete.