| 摘要 |
PCT No. PCT/EP94/00767 Sec. 371 Date Sep. 12, 1995 Sec. 102(e) Date Sep. 12, 1995 PCT Filed Mar. 11, 1994 PCT Pub. No. WO94/21747 PCT Pub. Date Sep. 29, 19941,2,2,2-Tetrafluoroethyl ethers of the formula IR-(A1-Z1)m-A2-Z2A3-O-CHF-CF3(I) are suitable as components of liquid-crystalline media wherein R is H, a substituted or unsubstituted alkyl or alkenyl radical having 1 to 15 carbon atoms, A1 and A2 are each, independently of one another, a (a) trans-1,4-cyclohexylene radicals and derivatives thereof in which, in addition, one or more non-adjacent CH2 groups is optionally replaced by -O- and/or -S-, (b) 1,4-phenylene radicals and derivatives thereof in which, in addition, one or two CH groups is optionally replaced by N, or (c) radical from the group consisting of 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, wherein radicals (a) and (b) are optionally substituted by one or two fluorine atoms, Z1 and Z2 are each, independently of one another, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, -CH=CH-, -C 3BOND C- or a single bond, and one of the radicals Z1 and Z2 is optionally -(CH2)4- -CH=CH-CH2CH2-, X is H, F or Cl and is 0, 1 or 2.
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