| 摘要 |
2-Fluoroperfluoroalkylcyclohexene derivatives of the formula I <IMAGE> I where R is an alkyl or alkenyl radical having up to 18 carbon atoms which is unsubstituted or substituted by CN or by at least one halogen and in which one or more non-adjacent CH2 groups may be replaced by a radical selected from the group consisting of -O-, -S-, -CO-, -O-CO-, -CO-O- and -C=C-, A1 and A2 are each, independently of one another, a) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, b) a 1,4-cyclohexylene radical, in which one or two non-adjacent CH2 groups may be replaced by -O- or -S-, c) a 1,4-cyclohexenylene, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or naphthalene-2,6-diyl radical, where the radicals a) and b) may be monosubstituted or polysubstituted by halogen atoms, cyano groups and/or methyl groups, Z1 and Z2 are each, independently of one another, -CO-O-, -O-CO-, -CH2CH2-, -C=C-, -CH=CH-, -OCH2-, -CH2O- or a single bond, or one of the radicals Z1 and Z2 is alternatively -(CH2)4- or -CH=CH-CH2CH2-, o is 0, 1 or 2, and n is 0-7. The derivatives of the present invention can be used as components of liquid-crystalline media for electro-optical display elements, in particular for matrix liquid-crystal displays.
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