NEW MATERIAL:A trans-4-alkyl-trans-4"-( 3-trifluoromethylbenzoyloxy )-octadecahydro-trans-p-terphenyl of formula I (R is H or 1W10C alkyl).

EXAMPLE: trans-4- Propyl-trans-4" -( 3-trifluoromethylbenzoyloxy )-octadecahydro- trans-p-terphenyl.

USE: A liquid crystal substance exhibiting the liquid crystal phase within a wide temperature range, having a low viscosity and about +0.5 dielectric anisotropy though a high clear point while changing the threshold voltage and saturation voltage of a composition not so much, and stable to moisture, heat, light, etc.

PROCESS: A trans-4-alkyl-trans-4"-hydroxy-trans-octadecahydro-p-terphenyl of formula II is reacted with a compound of formula III in the presence of pyridine to give the aimed compound of formula I .