electrode cell of 2 u03bcm in thickness which had been subjected to orientation by rubbing and heated to 180 u00b0 c to thereby give an isotropic liquid the liquid crystal cell thus obtained was cooled under a crossed nicol prism while applying rectangular pulses 15 v 1 hz thereto as a result definite switching behaviors were observed 0 23 g of 4 n octylbenzoic acid 0 31 g of s 4 4 39 methyloctoxy biphenol 0 21 g of n n 39 dicyclohexyl carbodiimide 0 02 g of 4 pyrolidinopyridine and 10 ml of dichloromethane were stirred for 3 hours at room temperature the precipitated n n 39 dicyclohexyl urea were filtered and the filtrate was evaporated the product was purified on a silica gel column with the use of hexane diethylether 95 5 as a developing solvent and s 4 n octylbenzoic acid 4 4 39 methyloctoxy biphenyl ester was obtained infrared spectroscopy cm 1 3050 vw 2930 s 2860 m 1735 s 1610 s 1575 vw 1495 s 1470 m 1415 vw 1380 w 1270 s 1215 s 1180 m 1170 m 1120 vw 1080 s 1020 w 1000 w 930 vw 885 w 840 m 810 m 760 w 730 vw 640 vw and 520 w str32 this compound was poured into a transparent glass electrode cell of 2 u03bcm in thickness which had been subjected to orientation by rubbing and heated to 180 u00b0 c to thereby give an isotropic liquid the liquid crystal cell thus obtained was cooled under a crossed nicol prism while applying rectangular pulses 15.