NEW MATERIAL:A compound of formula I [R and R' are 1-7C straight chain alkyl; the cyclohexane ring is in the trans(equatorial-equatorial) configuration]. USE:An electrooptical display material, having a weakly positive dielectric anisotropy, and usable as a material for dynamic light scattering display cells in the state of a mixture with anther nematic liquid crystal compound having a negative or weakly positive dielectric anisotropy and as a material for electric field type display cells in the state of a mixture with another nematic liquid crsytal compound having a strongly positive dielectric anisotropy. PROCESS:A compound of formula II is reacted with a compound of formula IIIin an inert organic solvent, e.g. ether or benzene, in the presence of a basic compound, e.g. pyridine, as a catalyst according to the reaction formula to afford the aimed compound of formula I .
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