NOVELTY - Aryl compounds (Q) are new.    USE - (Q) is useful: to prepare polymers, oligomers or dendrimers; in organoelectronic devices, preferably organic-LED, organic field-effect transistors, organic thin-film transistors, organic light-emitting transistors, organic integrated circuits, organic solar cell, organic field-quench devices, light emitting electrochemical cell, organic photoreceptor or organic laser diode; and as hole transport material in hole transport layer and/or a hole injection layer, where (Q) is optionally doped with electron receptor compounds, electron transport material in an electron transport layer, hole block material in hole block layer, triplet-matrix material in an emitting layer containing (Q) or polymer, oligomer or dendrimer (all claimed).    ADVANTAGE - (Q) provides organoelectronic devices with high stability, high lifetime, and efficiency.    DETAILED DESCRIPTION - Aryl compounds (Q) of formulae (I)-(IV) are new.    A = aryl group of formula (V);    Y1 = B, N, P, P=O, PF2, P=S, As, As=O, As=S, Sb, Sb=O, Sb=S, Bi, Bi=O, Bi=S, C=O, O, S, Se, Te, S=O, SO2, Se=O, SeO2, Te=O or TeO2;    Z = CR or N;    X = a divalent bridge comprising B(R1), C(R1)2, Si(R1)2, C=O, C=NR1, C=C(R1)2, O, S, S=O, SO2, N(R1), P(R1) or P(=O)R1; either    R = H, D1, F, Cl, Br, I, N(R2)2, N(Ar1)2, C(=O)Ar1, P(=O)Ar12, S(=O)Ar1, S(=O)2Ar1, CR2=CR2Ar1, CN, NO2, Si(R2)3, B(OR2)2, OSO2R2, or 1-40C-alkyl, 1-40C-alkenyl, 1-40C-alkynyl, 1-40C-alkoxy, 1-40C-thioalkoxy, cyclic 3-40C-alkyl, 3-40C-alkenyl, 3-40C-alkynyl, 3-40C-alkoxy or 3-40C-thioalkoxy (all optionally substituted by one or more R2, where one or more non-adjacent CH2 groups are optionally replaced by R2C=CR2, 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 optionally replaced by F, Cl, Br, I, CN or NO2) or (hetero)aryl ring system with 5-40 aromatic ring atoms (optionally substituted by one or more R2), or (hetero)aryloxy group (optionally substituted by one or more R2); or    2R = a mono- or polycyclic aliphatic ring system; either    R1 = H, D1, F, Cl, Br, I, CN, NO2, N(R2)2, B(OR2)2, Si(R2)3, or 1-40C-alkyl, 1-40C-alkenyl, 1-40C-alkynyl, 1-40C-alkoxy, 1-40C-thioalkoxy, cyclic 3-40C-alkyl, 3-40C-alkenyl, 3-40C-alkynyl, 3-40C-alkoxy or 3-40C-thioalkoxy (all optionally substituted by one or more R2, where one or more non-adjacent CH2-groups are optionally replaced by -R2C=CR2-, -C?=C-, Si(R2)2, Ge(R2)2, C=O, C=S, C=Se, C=NR2, -O-, -S-, -COO- or -CONR2- and one or more H atoms are optionally replaced by F, Cl, Br, I, CN or NO2), aryl amine, carbazole (optionally substituted by R2), or (hetero)aryl ring system with 5-40 aromatic ring atoms (optionally substituted by one or more non-aromatic R1); or    2R1 = a mono- or polycyclic ring system;    R2 = H, D1 or an aliphatic or aromatic 1-20C-hydrocarbon;    Ar1 = (hetero)aryl ring system with 5-40 aromatic ring atom (optionally substituted by one or more R1);    E = a single bond, N(R1), O, S, C(R1)2, Si(R1)2 or B(R1);    q = 1, when the central atom of Y1 is an element from III or V main group, or 0, when the central atom of Y1 is an element from IV or VI main group; and    t, v = 0 or 1.    Provided that: t is 0, when q is 0, and when t is 0, then R1 is boned in the place of E; and when v is 0, then R2 or Ar1 is bonded at the place of Y1. INDEPENDENT CLAIMS are included for:    (1) a polymer, oligomer or dendrimer containing (Q), where one or more residues, H atoms or R of (Q) represents a bond to the polymer, oligomer or dendrimer; and    (2) the preparation of (I).