Patent ID: 8859111

Claim:
A compound of formula I wherein R is selected on each occurrence, identically or differently, from the group consisting of F, CN, NO 2 , ArNAr 2 , NAr 2 , C(═O)Ar, C(═O)R 2 , P(═O)Ar 2 , S(═O)Ar, S(═O) 2 Ar, —CR 2 ═C(R 2 ) 2 and a mono- or polycyclic aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, optionally substituted by one or more non-aromatic radicals R 1 ; two radicals Ar which are bonded to the same nitrogen or phosphorus atom are optionally linked to one another by a single bond or a bridge selected from B(R 2 ), C(R 2 ) 2 , Si(R 2 ) 2 , C═O, C═NR 2 , C═C(R 2 ) 2 , O, S, S═O, SO 2 , N(R 2 ), P(R 2 ) and P(═O)R 2 ; R 1 is selected, identically or differently on each occurrence, from the group consisting of H, D, F, OH, CN, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms and a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms or an alkenyl group having 2 to 40 C atoms, each of which is optionally substituted by one or more radicals R 2 , where one or more non-adjacent CH 2 groups is optionally replaced by R 2 C═CR 2 , C≡C, Si(R 2 ) 2 , C═O, C═S, C═NR 2 , P(═O)(R 2 ), SO, SO 2 , NR 2 , O or S and where one or more H atoms is optionally replaced by D, F, Cl, Br, I, CN or NO 2 ; where, in addition, the respective R 1 which is located in the vicinal position to the radical R, in the case where R is an aromatic or heteroaromatic ring system, is optionally a divalent unit which is linked to the group R; Ar is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 1 ; R 2 is selected on each occurrence, identically or differently, from the group consisting of H, D, F, CN and an aliphatic, aromatic or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which, in addition, one or more H atoms may be replaced by F, CN, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms; two or more adjacent substituents R 2 may also be linked to one another by a covalent bond or also, in the case where the R 2 involved are aromatic or heteroaromatic hydrocarbon radicals, by one or more divalent aliphatic hydrocarbon units.