| abstract |
A liquid crystalline compound having a high elastic constant ratio (K33/K11) and an immproved solubility thereof in other liquid crystal materials, have the formula:- (1) : <CHEM> wherein Q represents -CF3, -CF2H or -CFH2; A1, A2 and A3 each independently represent a trans-1,4-cyclohexylene group, a 1,4-phenylene group wherein one or more hydrogen atoms on the ring may be replaced by F, C l or CN, a pyridine-2,5-diyl group or a 1,3-pyrimidine-2,5-diyl group; ring B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group which can be replaced at its lateral position by groups L, and L2 noted below; Z1, Z2 and Z3 each independently represent a covalent bond or a group -CH=CH-, -C=C-, -OCO-, -COO-, -CH2O-, -OCH2-, -(CH2)2- or -(CH2)4-; l and m each independently represent 0 or an integer of 1 to 5; o and p each independently represent 0 or 1; L1 and L2 each independently represent H, F or C l ; and L3 represents a hydrogen or halogen atom, -CN, -CF3, -CF2H, -CFH2, -OCF3, -OCF2H, a C1-C10 alkyl group or a C2-C10 alkenyl group [wherein optional non-adjacent methylene groups (-CH2-) in the alkyl group or the alkenyl group may each independently be replaced by -O-, -S-, -CO-, -OCO- or -COO-]. |