New sulfur pentafluoride derivative liquid crystal media components

摘要

New sulfur pentafluoride derivatives for use as components of liquid crystal media. Sulfur pentafluoride derivatives of formula R<1>-(A<1>Z)n-A-SF5 (I) are claimed: R<1> = H, 1-12 C alkyl or 2-12 C alkenyl (both optionally substituted with one CN or CF3 group or at least one halogen and/or optionally having one or more nonadjacent CH2 groups replaced by O, S, CO, cyclobutane- 1,3-diyl, COO, OCO or OCOO); A<1> = (a) trans-1,4- cyclohexylene (optionally with one or more nonadjacent CH2 replaced by O and/or S), (b) 1,4-phenylene (optionally with 1 or 2 CH replaced by N), (c) 1,4-bicyclo(2.2.2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl or its decahydro or 1,2,3,4-tetrahydro derivative, or (d) 1,4-cyclohexenylene, in which groups (a), (b) and (d) may also be substituted with CN, Cl or F; Z = -COO-, -OCO-, -CH2O-, -O-, -OCH2-, -CH2CH2-, -CH=CH-, -C equivalent to C-, single bond, (trans) -(CF=CF)u- or -(CF2)v-; u, n = 1-3; v = 2-4. A = (II), (III) or (IV); L<1>-L<3> = H or F; The claim does not include compounds in which at least two of the three groups L<1>-L<3> are H and at the same time none of the groups Z are -(CF=CF)u- or -(CF2)v-. Independent claims are included for: (a) a method for the production of compounds (I) in which A = trans-1,4- cyclohexylene, Z = COO, OCO, CH2O, O, OCH2, CH2CH2, a single bond, (CHFCHF)u (sic) or (CF2)v, by hydrogenation of the corresponding 1,4-phenylene derivative; (b) a liquid crystalline (LC) medium with at least two LC components, containing at least one compound (I); (c) LC display elements containing such LC media; (d) electro-optical display elements containing such LC media as the dielectric.