NOVELTY - A polycyclic-type compound (1 or 2) is new.    USE - Polycyclic-type compound is used for forming organic thin film layer of organic electroluminescent element (claimed). Uses include but are not limited to light source of electronic device, organic solar cell, organic semiconductor laser, sensor and organic thin film transistor.    ADVANTAGE - The polycyclic-type compound provides organic electroluminescent element having excellent luminous efficiency and durability.    DETAILED DESCRIPTION - A polycyclic-type compound of formula (1 or 2) is new. The polycyclic compounds (1,2) are preferably of formulae (3,4), respectively.    Ar1-Ar3=6C optionally substituted aromatic hydrocarbyl or aromatic heterocyclic group;    X1-X4=oxygen, sulfur, N-R1 or CR2R3;    R1-R3=1-20C alkyl, 3-20C optionally substituted cycloalkyl, 7-24C aralkyl, silyl, 3-20C substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group;    o-q=0 or 1;    s=1-3;    n=2-4;    L1=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C bivalent aromatic hydrocarbyl or 3-24C optionally substituted monovalent or bivalent aromatic heterocyclic group;    L2=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C bivalent aromatic hydrocarbyl or 3-24C optionally substituted bivalent aromatic heterocyclic group;    A1=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group connected with L1 by carbon-carbon bond;    A2=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group;    Y1-Y3=1-20C alkyl, 3-20C optionally substituted cycloalkyl, 1-20C alkoxy, 7-24C aralkyl, 3-20C silyl, 6-24C optionally substituted aromatic hydrocarbyl, or 3-24C aromatic heterocyclic group connected with benzene rings (a-c) by carbon-carbon bond;    d,f=0-3;and    e=0-2.    When n is 2, L3 is L2, when n is 3, L3 is 1-20C trivalent saturated hydrocarbyl, 3-20C optionally substituted trivalent cycloalkane, trivalent silyl, silyl or 1-20C trivalent substituted silyl, 6-24C optionally substituted trivalent aromatic hydrocarbyl, or 3-24C optionally substituted aromatic heterocyclic group, and when n is 4, L3 is 1-20C tetravalent saturated hydrocarbyl, 3-20C optionally substituted tetravalent cycloalkane, silicon atom, 6-24C optionally substituted tetravalent aromatic hydrocarbyl, or 3-24C optionally substituted aromatic heterocyclic group. Full Definitions are included in"DEFINITIONS - Full Definitions:"section. INDEPENDENT CLAIMS are included for the following: (i) halogen compound of formula (30), preferably of formula (31); and (ii) organic electroluminescent element. The element has organic thin film layer(s) containing a light emitting layer and arranged between a cathode and an anode. The organic thin film layer contains polycyclic compound having pi-conjugated heteroacene structure crosslinked via carbon atom, nitrogen atom, oxygen atom or sulfur atom.    X30,X31=oxygen, sulfur or N-R1;    Z=fluoro, chloro, bromo or iodo;    t,u,v=0 or 1;and    t+u+v=1 or more.