Liquid crystalline compounds for use in media for electro-optical displays, e.g. in cars or aircraft, comprise compounds with tetrahydropyran-3,6- diyl and oxydifluoromethylene linking groups

摘要

Liquid crystalline compounds with tetrahydropyran-3,6-diyl groups and oxydifluoromethylene groups in addition to other divalent aromatic and/or alicyclic and/or heterocyclic groups and possibly other linking groups. Liquid crystalline (LC) compounds of formula (I); [Image] R1>, R2>H, halogen, or optionally halogenated 1-15C alkyl or alkoxy (optionally with one or more CH2 groups replaced by -Ctriple boundC-, -CH=CH-, -O-, -COO- or -OCO-), with the proviso that one of these groups R1> or R2> may also be CN, OCN, SCN, NCS or SF5; A1>-A4>trans-1,4-cyclohexylene, 1,4- phenylene, 2- or 3-fluoro-1,4-phenylene, 2,3- or 3,5-difluoro-1,4-phenylene, 1,3-dioxan-5,2-diyl, tetrahydropyran-3,6-diyl or -2,5-diyl, cyclohexene-4,1- diyl, 2-fluoro-cyclohexene-4,1-diyl or bicyclo[2.2.2]octane-1,4-diyl; Z1>-Z3>-COO-, -OCO-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CH2CH2-, -(CH2)4-, - C2F4-, -CH2CF2-, -CF2CH2-, -CF=CF-, -CH=CH-, -Ctriple boundC- or a single bond; a, b, c : 0, 1, 2 or 3; (a+b+c) : not more than 3. Independent claims are also included for: (1) LC media containing at least two mesogenic compounds, with at least one compound of formula (I) (2) electro-optical LC displays containing such LC media.