Compounds having a C—C triple bond

A compound of formula I

• in which
• H/F means H or F,
• A1-5 independently of one another, denote
• a) 1,4-phenylene, in which one or more CH groups are optionally replaced by N, or
• b) a radical of one of the following formulae
• wherein in a) and b), optionally one or more H atoms are independently replaced by L, which L in a) and b) each, 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,
• and wherein one of the rings A3 and A4 denotes
• Y denotes S or O,
• R1 denotes a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups are optionally replaced, independently of one another, by —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 denotes F, Cl, Br, CN, SCN, NCS or SF5,
• X denotes F, Cl, Br, CN, SCN, NCS, SF5 or a halogenated alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups are optionally replaced, independently of one another, by —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 all denote a single bond, and
• m, n, p, q independently denote 0 or 1, where m+n+p+q is 1, 2, 3 or 4.