NOVELTY - Preparing a secondary amine compound (III) comprises reacting an aromatic or heteroaromatic compound (I) and a primary amine compound (II).    USE - The process is useful for preparing (III), preferably 3-(2-pyridyl)-N-(3-(2-pyridyl)phenyl)aniline, which is useful for preparing a ligand that is a tertiary amine for metal complexes (all claimed), where the ligand is useful for high performance electronic and electroluminescent devices including organic electroluminescent devices, organic integrated circuits, organic field-effect transistors, organic thin-film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, ight-emitting electrochemical cells and organic laser diodes.    ADVANTAGE - The versatile process efficiently and economically prepares (III) with high yield and purity, and good emission properties.    DETAILED DESCRIPTION - Preparing a secondary amine compound of formula (III), comprises: either reacting an aromatic or heteroaromatic compound of formula (I) and a primary amine compound of formula (II); or performing Buchwald reaction of (III) with a halide compound of formula (R1-Hal).    Ring A, B, C, D=aryl or heteroaryl ring, condensed ring system or polycyclic ring system (all optionally substituted with one or more rests of R1);    X1-X4=C or N, where at least two out of X1-X4 represent N;    B1(i)=bridging units, which are single bond, rings, preferably 5-membered rings comprising at least one N-atom and condensed to both neighboring rings, bivalent atoms or groups, preferably C(R1) 2, N-R1, P1-R1, or Si(R1)2;    i=1 or 2;    V1=leaving group, preferably comprising Hal or CF 3SO 3 (trifluoromethanesulfonate or triflate), preferably Br;    Hal=halo comprising F, Cl, Br or I;    R1=straight-chain alkyl, alkoxy 1-40C-thioalkoxy, straight-chain alkenyl or 2-40C-alkynyl, branched or cyclic alkyl, alkenyl, alkynyl, alkoxy, 3-40C-thioalkoxy, aryl or heteroaryl ring system having 5-60C-aryl ring atoms, aryloxy or heteroaryloxy group having 5-60C-aryl ring atoms, diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10-40C-aryl ring atoms (all substituted by one or more groups of R2), H, D, F, Cl, Br, I, N(R2) 2, CN, NO 2, Si(R2) 3, B(OR2) 2, C(O)R2, P(O)(R2) 2, S(O)R2, SO2R2, OSO2R2, B(R2)2, where one or more non-adjacent CH 2 groups are 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, SO 2, NR2, O, S or CONR2, where one or more H atoms are replaced by D, F, Cl, Br, I, CN or NO 2, and two or more radicals of R1 may form a mono- or polycyclic, aliphatic, aryl and/or benzo-fused ring system with one another;    R2=straight-chain alkyl, alkoxy or 1-40C-thioalkoxy, straight-chain alkenyl or 2-40C-alkynyl, branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or 3-40C-thioalkoxy, aryl or heteroaryl ring system having 5-60C-aryl ring atoms, aryloxy or heteroaryloxy group having 5-60C-aryl ring atoms, diarylamino group, diheteroarylamino group or arylheteroarylamino group having 10-40-aryl ring atoms (all optionally substituted by one or more groups of R3), H, D, F, Cl, Br, I, N(R3) 2, CN, NO 2, Si(R3) 3, B(OR3)2, C(O)R3, P(O)(R3) 2, S(O)R3, SO2R3 or OSO2R3, where one or more non-adjacent CH 2 groups are 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, SO 2, NR3, O, S or CONR3, one or more H atoms are replaced by D, F, Cl, Br, I, CN or NO 2, and two or more adjacent groups of R2 form a mono- or polycyclic, aliphatic or aryl ring system with one another; and    R3=H, D, F or an aliphatic, aryl and/or 1-20C-heteroaryl hydrocarbyl, in which, in addition, one or more H atoms are replaced by F, where two or more substituents of R3 form a mono- or polycyclic, aliphatic or aryl ring system with one another.    An INDEPENDENT CLAIM is included for the secondary amine compound (III).