Partially fluorinated benzene derivatives

A partially fluorinated benzene compound of the formula I ##STR448## in which R.sup.1 is H, an alkyl or alkenyl radical having 1 to 15 carbon which is unsubstituted, monosubstituted by CN or CF.sub.3, or monosubstituted to perhalo-substituted by halogen, where, optionally, one or more CH.sub.2 groups in these radicals may each independently of one another be replaced by --O--, --S--, ##STR449## --CO--, --CO--O--, --O--CO--or --O--CO--O in such a way that O atoms are not linked directly to one another,

• A.sup.1 and A.sup.2 are each, independently of one another,
• (a) a trans-1,4-cyclohexylene radical in which, optionally, one or more non-adjacent CH.sub.2 groups may be replaced by --O-- and/or --S--,
• (b) a 1,4-phenylene radical in which, optionally, one or two CH groups may be replaced by N,
• (c) a radical from the group consisting of 1,4-cyclohexenylene, 1,4-bicyclo›2.2.2!octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1, 2, 3, 4-tetrahydronaphthalene-2,6-diyl,
• where the radicals (a) and (b) may further optionally be substituted by one or two fluorine atoms,
• Z.sup.1 and Z.sup.2 are each, independently of one another, --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --(CH).sub.4 --, --CH.dbd.CH--CH.sub.2 CH.sub.2 -- or a single bond,
• m is 0, 1 or 2,
• n is 0 or 1,
• L.sup.1, L.sup.2 and L.sup.3 are each, independently of one another, H or F, and
• R.sup.2 is an alkyl radical having 1 to 6 carbon atoms which is unsubstituted or substituted by one or more fluorine atoms.