Patent ID: 11917903
Assignee: UDC IRELAND LIMITED
Field: Organic fine chemistry (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 4:
5. The compound according to claim 1, characterized in that V1 is selected from the groups of the formulae (2) and (3), , where the dotted bonds represent the bonds to the central sub-ligand or to the sub-ligand(s) L1, R has the definitions given in claim 1 and the other symbols used are as follows:
A is the same or different at each instance and is —CR═CR—, —C(═O)—NR′—, —C(═O)—O—, —CR2—CR2—, —CR2—O— or a group of the following formula (4):, where the dotted bond represents the position of the bond of the central sub-ligand or of a sub-ligand L1 to this structure and * represents the position of the linkage of the unit of the formula (4) to the central cyclic group, i.e. the group explicitly included in formula (2) or (3);
X1 is the same or different at each instance and is CR or N;
X2 is the same or different at each instance and is CR or N, or two adjacent X2 groups together are NR, O or S, thus forming a five-membered ring, and the remaining X2 are the same or different at each instance and are CR or N; or two adjacent X2 groups together are CR or N when one of the X3 groups in the cycle is N, thus forming a five-membered ring; with the proviso that not more than two adjacent X2 groups are N;
X3 is C at each instance or one X3 group is N and the other X3 groups in the same cycle are C; with the proviso that two adjacent X2 groups together are CR or N when one of the X3 groups in the cycle is N;
A1 is the same or different at each instance and is C(R)2 or O;
A2 is the same or different at each instance and is CR, P(═O), B or SiR, with the proviso that, when A2=P(═O), B or SiR, the symbol A1 is O and the symbol A bonded to this A2 is not —C(═O)—NR′— or —C(═O)—O—;
R′ is the same or different at each instance and is H, D, a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl group in each case may be substituted by one or more R1 radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R1)2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R1 radicals.