| 摘要 |
<p>New liquid crystal compounds (I) containing cyclic structures, at least one of which is a tetrahydropyran-2,5-diyl group, and various linking groups, at least one of which is an oxydifluoromethylene group. Liquid crystal compounds of formula (I) are new: R1, R2 = H, halogen or optionally halogenated 1-15C alkyl or alkoxy (optionally with one or more CH2 groups replaced by -C triple bond C-, -CH=CH-, O, COO or OCO, with the proviso that one of these groups can also be CN, OCN, SCN, NCS or SF5; A1-A4 = trans-1,4-cyclohexylene (Cyc), 1,4-phenylene (Phe), 2- or 3-fluoro-1,4-phenylene, 3,5- or 2,3-difluoro-1,4-phenylene, 1,3-dioxan-5,2-diyl, tetrahydropyran-5,2-diyl or -2,5-diyl, dihydropyran-5,2-diyl, 1,4-cyclohex-4-enylene (optionally with F at position 5), or 1,4-bicyclo(2.2.2)octylene; Z1-Z3 = COO, OCO, CF2O, OCF2, CH2O, OCH2, -CH2CH2-, -(CH2)4-, -C2F4-, -CH2CF2-, -CF2CH2-, -CF=CF-, -CH=CH-, -C triple bond C- or a single bond; a, b, c = 0, 1, 2 or 3; and (a+b+c) = not more than 3. Independent claims are also included for: (1) liquid crystal compounds of formula (IA); (2) liquid crystal media containing at least two mesogenic compounds, which contain at least one compound (I); and (3) electro-optical liquid crystal displays containing such liquid crystal media. (a+b) = 1 or 2; and L1, L2 = H or F.</p> |
