Compounds having a c-c triple bond

Compounds of the formula I

• in which
• A1-5, independently of one another, denote
• a) 1,4-phenylene, in which one or more CH groups may be replaced by N,
• b) a radical of the formula
• c) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or two non-adjacent CH2 groups may be replaced by —O— and/or —S—, or
• d) a radical from the group 1,4-bicyclo[2.2.2]octylene, cyclobutane-1,3-diyl, spiro[3.3]heptane-2,6-diyl, thiophene-2,5-diyl or furan-2,5-diyl,
• and in which, in groups a), b), c) and d),
• optionally one or more H atoms independently have been replaced by a group L,
• where at least one of the rings A3 and A4 where p=1 denotes a radical selected from the radicals
• L, independently of one another, denotes Br, Cl, F, CN, —NCS, —SCN, SF5, C1-C10 alkyl, C1-C10 alkoxy, C3-C6 cycloalkyl or a mono- or polyfluorinated C1-C10 alkyl or alkoxy group,
• R1 in each case, independently of one another, denotes a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —(CO)O—, —O(CO)—, —(CO)—, —O— or —S— in such a way that O or S atoms are not linked directly to one another, or F, Cl, Br, CN, CF3, OCF3, SCN, NCS or SF5,
• X denotes F, Cl, Br, CN, SCN, NCS, SF5 or a halogenated alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in this radical may each be replaced, independently of one another, by —C≡C—, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —(CO)O—, —O(CO)—, —(CO)—, —O— or —S— in such a way that O or S atoms are not linked directly to one another,
• Z1, Z2, Z4, Z5, independently of one another, denote a single bond, —C≡C—, —CH═CH—, —CH2O—, —(CO)O—, —CF2O—, —CF2CF2—, —CH2CF2—, —CH2CH2—, —(CH2)4—, —CH═CF— or —CF═CF—, where asymmetrical bridges may be oriented to both sides, and
• m, n, p, q independently denote 0 or 1, where m+n+p+q is 1, 2, 3 or 4.