PURPOSE: To obtain the subject new compound having a specific dimer-type structure, presenting stable antiferroelectricity, and capable of improving hysteresis form through potentiating antiferroelectricity by its addition to liquid crystals low in antiferroelectricity and poor in hysteresis form or to ferroelectric liquid crystals.
CONSTITUTION: This new compound is expressed by formula I [R1 and R3 are each a (substituted) 1-18C alkyl; R2 and R4 are each CF3 or CH3; X1 and X2 are each a single bond, O, etc.; Y1, Y2, Z1 and Z2 are each a single bond, COO, etc.; cyclic A1, A2, B1, B2, C1 and C2 are each a (1 or 2F-substituted) 1,4- phenylene, trans-1,4-cyclohexylene, etc.; (m) is 7-20; (n1) and (n2) are each 0 or 1; * denotes an asymmetric carbon atom], e.g. (S,S)-1,1,1,11,11,11,- hexafluoro-2,10-bis{4-[4-(4-octyloxyphenyl)- phenylcarboxy]phenylcarboxy}undecane. This compound of formula I is obtained by reaction between a compound of formula II, a compound of formula III and a compound of formula IV using a dehydrating condensation agent such as ethyl polyphosphate.
SUZUKI GIICHI
KUSUMOTO TETSUO
HIYAMA TAMEJIROU
SAGAMI CHEM RES