| 摘要 |
A nematic liquid crystal compound represented by any one of formulas (a-1) to (a-6): in formulas (a-1) to (a-6), Ra and Rb are each independently hydrogen or alkyl having 1 to 10 carbons, provided that in the alkyl, -CH2- may be replaced by -O-, -(CH2)2- may be replaced by -CH-CH-, and hydrogen may be replaced by a halogen; ring A1 and ring A2 are each independently trans-1,4-cyclohexylene or 1,4-phenylene, provided that in these rings hydrogen may be replaced by a halogen, and in the case where the ring is trans-1,4-cyclohexylene, -CH2- may be replaced by -O-, and -CH2CH- may be replaced by -CH-C-; and Z1 and Z2 are each independently a single bond, -COO-, -OCO-, -OCH2-, -CH2O- or -CH2CH2-, provided that in formula (a-3), in the case where ring A2 is trans-1,4-cyclohexylene, Z2 is a single bond, -COO-, -OCO-, -OCH2- or -CH2O-, in the case where Ra is -C3H7, Rb is -OC2H5, and Z2 is a single bond, ring A2 is trans-1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2-fluoro-3-chloro-1,4-phenylene, 2-chloro-3-fluoro-1,4-phenylene or 2,3-dichloro-1,4-phenylene, and in formula (a-4), in the case where ring A1 is trans-1,4-cyclohexylene, Z1 is a single bond, -COO-, -OCO-, -OCH2O-.
|
