NOVELTY - Aromatic compounds (I) are new, where (I) excludes 2-(9-(4,6-diphenyl-1,3,5-triazin-2-yl)fluoren-9-yl)-4,6-diphenyl-1,3,5-triazine.    USE - (I) are useful in an electronic device, preferably an organic electroluminescent device (organic LED and polymer LED), organic FET, organic thin-film transistor, organic light-emitting transistor, organic integrated circuits, organic solar cell, organic field-quench devices, light-emitting electrochemical cell, organic laser diode or organic photoreceptor (all claimed).    ADVANTAGE - (I) exhibit very high quantum efficiency; thermal stability; durability; solubility and quality.    DETAILED DESCRIPTION - Aromatic compounds of formula (I) are new, where (I) excludes 2-(9-(4,6-diphenyl-1,3,5-triazin-2-yl)fluoren-9-yl)-4,6-diphenyl-1,3,5-triazine.    X = CR1 or N, where in each cycle maximum 3 groups contains N;    Y1 = a single bond, BR1, C(R1)2, C(=O), C(=NR1), C(=C(R1)2), Si(R1)2, NR1, PR1, P(=O)R1, O, S, S(=O), S(=O)2, C(R1)2-C(R1)2, C(R1)2-NR1 or CR1=CR1;    R = Cl, Br, I, triflate, B(OR2)2, B(R2)2, B(N(R2)2)2, NAr12, N(R2)2, SiAr13, Si(R2)3, C(=O)Ar1, C(=O)R2, OAr1, OR2, SAr1, SR2, S(=O)Ar1, S(=O)R2, S(=O)2Ar1, S(=O)2R2, PAr12, P(R2)2, P(=O)Ar12, P(=O)(R2)2 or an aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms which is optionally substituted by one or more R1 residue; either    Ar1 = an aromatic or heteroaromatic ring system with 5-30 aromatic ring atoms, which is optionally substituted by one or more aromatic residues of R1, where 2Ar1 are bonded to N or P via a single bond or a bridge from B(R2), C(R2)2, Si(R2)2, C=O, C=NR2, C=C(R2)2, O, S, S=O, SO2, N(R2), P(R2) or P(=O)R2; either    R1 = H, D, F, Cl, Br, I, CHO, N(Ar1)2, C(=O)Ar1, P(=O)(Ar1)2, S(=O)Ar1, S(=O)2Ar1, CR2=CR2Ar1, CN, NO2, Si(R2)3, B(OR2)2, B(R2)2, B(N(R2)2)2, OSO2R2, or 1-40C-alkyl, 1-40C-alkoxy or 1-40C-thioalkoxy group or cyclic 3-40C-alkyl, 3-40C-alkoxy or 3-40C-thioalkoxy group (which is optionally substituted by one or more R2 residues, in which one or more non-adjacent CH2 group are substituted 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 one or more H atoms are substituted by F, Cl, Br, I, CN or NO2), or an aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms (which is optionally substituted by one or more R2 residues) and/or an aryloxy (which is optionally substituted by one or more R2 residues); or    2 or more R1 = a mono- or polycyclic, aliphatic or aromatic ring system; either    R2 = H, D or an aliphatic, more aromatic and/or heteroaromatic 1-20C hydrocarbon, in which H atoms are substituted by F; or    2 or more R2 = a mono- or polycyclic, aliphatic or aromatic ring system; and    n = 1 or 2.    INDEPENDENT CLAIMS are included for:    (1) the preparation of (I);    (2) a dimer, trimer, tetramer, pentamer, oligomer, polymer or dendrimer comprising (I), where one or more residues of R1 or R2 are bonded between (I) in the dimer, trimer, tetramer and/or pentamer and/or bonding of (I) to the polymer, oligomer or dendrimer or where the bonding takes place via substituents at the R groups;    (3) a mixture containing (I) and at least a further compound;    (4) a solution containing (I) and at least an organic solvent; and    (5) an organic electroluminescent device comprising an anode, a cathode, at least a light emitting layer and optionally a further layer from one or more hole injection layer, hole transport layer, hole block layer, electron transport layer, electron injection layer, electron block layer, exciton block layer and/or charge generation carrier.