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.    X 1,X 2=oxygen, N-R 1, or CR 2R 3;    R 1-R 3=1-20C alkyl, optionally 3-20C substituted cycloalkyl, 7-24C aralkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group;    n=2, 3, or 4;    L 3=coupling group;    L 1=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C bivalent optionally substituted silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (a) by carbon-carbon bond;    L 2=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl group or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (c) by carbon-carbon bond;    A 1=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or aromatic heterocyclic group connected with L 1by carbon-carbon bond;    A 2=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C aromatic heterocyclic group connected with L 2by carbon-carbon bond;    Y 1-Y 3=1-20C alkyl, 3-20C optionally substituted cycloalkyl, 1-20C alkoxy, 7-24C aralkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group connected with benzene rings (a-c) by carbon-carbon bond;    d,f=0,1,2, or 3;and    e=0,1, or 2.    When, both X 1and X 2are N-R 1, at least one of R 1is monovalent condensed-ring-aromatic-compound 8-24C substituted heterocyclic group. When n is 2, L 3is single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (c) by carbon-carbon bond. Full Definitions are included in"DEFINITIONS - Full Definitions:"section. INDEPENDENT CLAIMS are included for the following:    (1) halogen compound of formula (18), preferably of formula (19); and    (2) organic electroluminescent element. The electroluminescent element has organic thin film layer(s) including light emitting layer provided between a cathode and anode. The organic thin film layer contains polycyclic compound having pi-conjugated heteroacene structure crosslinked through carbon atom, nitrogen atom, oxygen atom or sulfur atom.    X 8,X 9=oxygen or N-R 1;    Z=fluoro, chloro, bromo or iodo;    t,u,v=0 or 1;and    t+u+v=1 or more.