| 摘要 |
Objects of this invention are cyclopentyl compounds of the general formula <IMAGE> I wherein k signifies a whole number of 4 to 18; n signifies 0 or 1; Y1, Y2 signify a single bond, -O-, -COO- or -OOC-; rings A, B, C each independently signify optionally mono- or difluorinated 1,4-phenylene, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyrazine-2,5-diyl, naphthalene-2,6-diyl, quinoline-2,6-diyl, thiophene-2,5-diyl, thiazole-2,5-diyl or 1,3,4-thiadiazole-2,5-diyl and ring C also signifies trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl; Z1 signifies a single bond, -COO-,-OOC- or -C 3BOND C-; Z2 signifies -COO-, -OOC-, -OCH2-, -CH2O- or -(CH2)2-; and R signifies straight-chain or branched, optionally optically active, alkyl or alkenyl with 4 to 20 carbon atoms in which one or two non-adjacent methylene groups can be replaced by -O-, -COO-, -OOC- and/or epoxyethylene and/or at least one hydrogen can be replaced by fluorine and/or one hydrogen can be replaced by chlorine or cyano and/or a terminal hydrogen can be replaced by cyclopentyl, mixtures containing such compounds as well as electro-optical devices containing these compounds.
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