A compound of formula G in which R G denotes H, non-fluorinated straight chain alkyl having 1 to 12 C atoms, or non-fluorinated straight chain or branched alkenyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more non-adjacent CH 2 -groups may be replaced by -O-, Z G1 and Z G2, identically or differently, denote -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -C≡C-C≡C- or a single bond, X denotes Cl or F, R denotes linear or branched or cyclic alkyl having 1 to 6 C atoms, t is 0, 1 or 2, and identically or differently, denote a radical selected from the following groups: a) the group consisting of 1,4-phenylene, 1,4-naphthylene, and 2,6-naphthylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L, b) the group consisting of trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4'-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl, and spiro[3.3]-heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH 2 groups may be replaced by -O- and/or -Sand in which one or more H atoms may be replaced by L, c) the group consisting of thiophene-2,5-diyl, thieno[3,2-b]thiophene-2,5-diyl, selenophene-2,5-diyl, each of which may also be mono- or polysubstituted by L, L on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF 5 or straight-chain or branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms. R G denotes H, non-fluorinated straight chain alkyl having 1 to 12 C atoms, or non-fluorinated straight chain or branched alkenyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more non-adjacent CH 2 -groups may be replaced by -O-, Z G1 and Z G2, identically or differently, denote -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -C≡C-C≡C- or a single bond, X denotes Cl or F, R denotes linear or branched or cyclic alkyl having 1 to 6 C atoms, t is 0, 1 or 2, and identically or differently, denote a radical selected from the following groups: a) the group consisting of 1,4-phenylene, 1,4-naphthylene, and 2,6-naphthylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L, b) the group consisting of trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4'-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl, and spiro[3.3]-heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH 2 groups may be replaced by -O- and/or -Sand in which one or more H atoms may be replaced by L, c) the group consisting of thiophene-2,5-diyl, thieno[3,2-b]thiophene-2,5-diyl, selenophene-2,5-diyl, each of which may also be mono- or polysubstituted by L, a) the group consisting of 1,4-phenylene, 1,4-naphthylene, and 2,6-naphthylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L, b) the group consisting of trans-1,4-cyclohexylene, 1,4-cyclohexenylene, tetralin-2,6-diyl, tetralin-5,8-diyl, decalin-2,6-diyl, bicyclo[1.1.1]pentane-1,3-diyl, 4,4'-bicyclohexylene, bicyclo[2.2.2]octane-1,4-diyl, and spiro[3.3]-heptane-2,6-diyl, in which one or two CH groups may be replaced by N, one or more non-adjacent CH 2 groups may be replaced by -O- and/or -Sand in which one or more H atoms may be replaced by L, c) the group consisting of thiophene-2,5-diyl, thieno[3,2-b]thiophene-2,5-diyl, selenophene-2,5-diyl, each of which may also be mono- or polysubstituted by L, L on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF 5 or straight-chain or branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms.