Substituted oxepines

A compound of the formula (4a) or (6a)

• V is either O or S,
• X is the same or different at each instance and is N or CR1,
• R1 is the same or different at each instance and is H, D, F, Cl, Br, I, N(R2)2, CN, NO2, Si(R2)3, B(OR2)2, C(═O)R2, P(═O)(R2)2, S(═O)R2, S(═O)2R2, OSO2R2, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy, alkylalkoxy or thioalkoxy group having 3 to 40 carbon atoms, each of which is optionally substituted by one or more R2 radicals, where one or more nonadjacent CH2 groups is optionally replaced by R2C═CR2, C≡C, Si(R2)2, Ge(R2)2, Sn(R2)2, C═O, C═S, C═Se, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S or CONR2 and where one or more hydrogen atoms is optionally replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and is optionally substituted in each case by one or more R2 radicals, or an aryloxy, arylalkoxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and is optionally substituted by one or more R2 radicals, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group which has 10 to 40 aromatic ring atoms and is optionally substituted by one or more R2 radicals, or a combination of two or more of these groups or a crosslinkable Q group;
• at the same time, two or more adjacent R1 radicals together may form a mono- or polycyclic, aliphatic or aromatic or heteroaromatic ring system which is optionally substituted by one or more R2 radicals;
• R2 is the same or different at each instance and is H, D, F, Cl, Br, I, N(R3)2, CN, NO2, Si(R3)3, B(OR3)2, C(═O)R3, P(═O)(R3)2, S(═O)R3, S(═O)2R3, OSO2R3, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy, alkylalkoxy or thioalkoxy group having 3 to 40 carbon atoms, each of which is optionally substituted by one or more R3 radicals, where one or more nonadjacent CH2 groups is optionally replaced by R3C═CR3, C≡C, Si(R3)2, Ge(R3)2, Sn(R3)2, C═O, C═S, C═Se, C═NR3, P(═O)(R3), SO, SO2, NR3, O, S or CONR3 and where one or more hydrogen atoms is optionally replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and is optionally substituted in each case by one or more R3 radicals, or an aryloxy, arylalkoxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and is optionally substituted by one or more R3 radicals, or a diarylamino group, diheteroarylamino group or arylheteroarylamino group which has 10 to 40 aromatic ring atoms and is optionally substituted by one or more R3 radicals, or a combination of two or more of these groups;
• at the same time, two or more adjacent R2 radicals together may form a mono- or polycyclic, aliphatic or aromatic or heteroaromatic ring system;
• R3 is the same or different at each instance and is H, D, F or an aliphatic, aromatic and/or heteroaromatic hydrocarbyl radical having 1 to 40 carbon atoms, in which one or more hydrogen atoms may also be replaced by F;
• at the same time, two or more R3 substituents together may also form a mono- or polycyclic, aliphatic or aromatic or heteroaromatic ring system;
• and with the proviso that at least one of the R1 radicals is not H.