Tetrahydropyran derivatives having at least one ester group (—CO—O—) ##STR1##

—F, —Cl, —OCHF₂, —OCF₃, —CF₃, —OCHFCF₃, —OCF₂CHFCF₃, SF₅, or —OCF₂CF₃; a process for preparing said tetrahydropyran derivatives, and the use of said tetrahydropyran derivatives as a component in a liquid crystal composition.