TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The electronic device is electroluminescent device having light emitting layer containing polycyclic compound as host material, and phosphorescent light-emitting material, provided between cathode and anode.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The polycyclic intermediate compound of formula (IXa, IXb, X, XI or XII) is reacted with aromatic amine compound of formula: HNA1A1', or of formula (f or g) in presence of base and catalyst in a solvent, to obtain polycyclic compound (I and/or II).Q=halo.Preferred Compounds: The polycyclic compound (I) is chosen from 7 compounds e.g. compound of formula (A-D). The polycyclic compound (II) is preferably of formula (E).R10,R10',R16,R16'=H, 1-18C alkyl or L1-X1;R3,R3',R4,R4',R7,R7'=-(C(=O))xL1-X1;-(C(=O))xL1-X1=-C(=O)A5, -P(=O)A4A4', -SiA6A7A8, -NA1A1', -BU-P(=O)A4A4', -BU-SiA6A7A8, -BU-N(-A3)-A3', -C(=O)-BU-N(-A3)-A3' or 26 aromatic groups chosen from group of formula (a1-a5);A5,A1,A1',A3,A3'=aromatic group of formula (a2 or a6);A4,A4',A6-A8=aromatic group (a1);andR116,R116', R117,R117'=H or 1-18C alkyl interrupted by -O-. Full Definitions:    X,X',Y',Y"=O, S, SO2, NR163, Se, or Te;    ring A-D=optionally substituted aryl group optionally having heteroatoms;    R1,R1',R11,R11'=-L1-X1;    or R1+R1',R11+R11=optionally substituted ring;    R163,R123,R127,R63-R67,R69=6-18C aryl substituted by 1-18C alkyl or 1-18C alkoxy, or 1-18C alkyl interrupted by -O-, or group -(C(=O))X-L1-X1;    x=0 or 1;    X1=6-28C aryl or 2-30C electron deficient heteroaryl (both optionally substituted), 1-18C alkyl interrupted by -O-, -CH=CH-Ar, -NA1A1', -P(=O)A4A4' or -SiA6A7A8;    Ar=6-14C aryl such as phenyl or naphthyl, optionally substituted by 1-25C alkoxy or 1-25C alkyl which is interrupted by -O-;    L1=single bond or bridging unit (BU) of formula (a-e);    A1,A1',A4,A4',A6-A8=6-24C aryl or optionally substituted 2-30C heteroaryl;    or A1+A1'+N=heteroaromatic ring or ring system of formula (f or g);    m'=0, 1 or 2;    m1=0 or 1;    R119,R120=1-18C alkyl or 1-18C alkoxy (both substituted by E and/or interrupted by D'), or 6-24C aryl or 2-20C heteroaryl (both substituted by G), 2-18C alkenyl, 2-18C alkynyl, 1-18C alkoxy or 7-25C aralkyl;    or R119+R120==CR121R122, or 5 or 6-membered ring optionally substituted by 1-18C alkyl or alkoxy (both substituted by E and/or interrupted by D'), 6-24C aryl or 2-20C heteroaryl (both substituted by G), 2-18C alkenyl, 2-18C alkynyl, 7-25C aralkyl or -C(=O)-R127;    R121,R122=1-18C alkyl or 1-18C alkoxy (both substituted by E and/or interrupted by D'), 6-24C aryl or 2-20C heteroaryl (both substituted by G), or H;    R123,R127,R63-R67,R69=6-18C aryl substituted by 1-18C alkyl or 1-18C alkoxy, or 1-18C alkyl interrupted by -O-;    D'=-CO-, -COO-, -S-, -SO-, -SO2-, -O-, -NR65-, -SiR70R71-, -POR72-, -CR63=CR64-, or -CC-;    E=-OR69, -SR69, -NR65R66, -COR68, -COOR67, -CONR65R66, -CN, or halo;    G=E, 1-18C alkyl or -SO2R73;    or R65+R66=5 or 6-membered ring;    R68=H or R67;    R70,R71=1-18C alkyl or 6-18C aryl substituted by 1-18C alkyl;    R73=1-18C alkyl interrupted by -O-, -CF3, 6-18C aryl substituted by 1-18C alkyl or 1-18C alkoxy;    R41=Cl, F, CN, -C6H4-N(-R45)-R45', NR45R45', 1-25C alkyl, 4-18C cycloalkyl, 1-25C alkoxy, in which one or more carbon atoms which are not adjacent to each other is optionally replaced by -NR45-, -O-, -S-, -C(=O)-O-, or -O-C(=O)-O-, and/or hydrogen atom(s) is optionally replaced by F, 6-24C aryl, or 6-24C aryloxy, where carbon atom(s) is optionally replaced by O, S, or N, and/or substituted by non-aromatic groups R41;    or two or more R41=ring;    R45,R45'=1-25C alkyl, 4-18C cycloalkyl, in which one or more carbon atoms which are not adjacent to each other is optionally replaced by -NR45"-, -O-, -S-, -C(=O)-O-, or -O-C(=O)-O-, and/or hydrogen atom(s) is optionally replaced by F, 6-24C aryl, or 6-24C aryloxy, where one or more carbon atoms is optionally replaced by O, S, or N, and/or substituted by non-aromatic group(s) R41;and    R45=1-25C alkyl, or 4-18C cycloalkyl.    Ring A and B are not substituted by hydroxy, ester, ether, or epoxy groups. When Y' and Y" are NR163, is different from acetyl group, and linear or branched chain 1-7C alkyl group. The polycyclic compound (I and/or II) does not include 2-(9-(2-hydroxyphenyl)-8,16-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,10(15),11,13-hexaen-1-yl)phenol, 1,9-bis(2-methoxyphenyl)-8,16-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,10(15),11,13-hexaene, 4,6,12,14-tetra-tert-butyl-1,9-bis(4-methoxyphenyl)-8,16-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,10(15),11,13-hexaene, 4b,9b-diphenyl-4b,9b-dihydro-benzo(b)benzo(4,5)furo(2,3-d)furan, 1,9-bis(2,3,4,5,6-pentahydrogeniophenyl)-8,16-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,10(15),11,13-hexaene, 2,7-dibromo-4b,9b-diphenyl-4b,9b-dihydro-benzo(b)benzo(4,5)furo(2,3-d)furan, 3,8-dibromo-4b,9b-diphenyl-4b,9b-dihydro-benzo(b)benzo(4,5)furo(2,3-d)furan and 1,13-diphenyl-12,24-dioxahexacyclo(11.11.0.02,11.04,9.014,23.016,21)tetracosa-2(11),3,5,7,9,14(23),15,17,19,21-decaene. Preferred Definitions:    X=O, S, SO2, N-(C(=O))x-BU-A1A1', N-(C(=O))x-R170, N-(C(=O))x-BU-R170;    R170=R123;    R1=L1-X1 or aromatic group of formula (h-n);    R216,R217=H or 1-18C alkyl which is interrupted by O;    L1X1=31 aromatic groups chosen from group (a1-a5);    R41=1-18C alkyl interrupted by -O-, or phenyl optionally substituted by diphenylamino group;    Y'=O, SO2, NR163 or S;    R163=1-4C alkyl, C(=O)-R170 or C(=O)-BU-R170;and    R11=aromatic group (h, i or l).    SPECIFIC COMPOUNDS - 281 Polycyclic compounds are specifically claimed e.g. 2-(1,9-diphenyl-13-(3-phenylquinoxalin-2-yl)-8,10-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2,4,6,11,13,15-hexaen-5-yl)-3-phenylquinoxaline of formula (Ia), 9-(14-(9H-carbazol-9-yl)-1,9-diphenyl-8,10-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,11(16),12,14-hexaen-4-yl)-9H-carbazole, 9-(13-(9H-carbazol-9-yl)-1,9-diphenyl-8,10-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,11(16),12,14-hexaen-5-yl)-9H-carbazole, 1,5,9,13-tetraphenyl-8,10-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,11(16),12,14-hexaene and 1,9-diphenyl-5,13-bis(pyren-1-yl)-8,10-dioxatetracyclo(7.7.0.02,7.010,15)hexadeca-2(7),3,5,11(16),12,14-hexaene.    EXAMPLE - 1-(8-(2-Oxo-2-phenyl-acetyl)-5a,10b-diphenyl-5a,10b-dihydro-benzo(b)benzo(4,5)furo(3,2-d)furan-3-yl)-2-phenyl-ethane-1,2-dione (in g) (1.5) and 1,2-phenylene diamine (689 mg) were mixed in mixed solvent (57 ml) of ethanol/chloroform under nitrogen atmosphere, heated, 97% sulfuric acid (4 drops) was added to the reaction mixture, heated for 3 hours and 30 minutes, cooled using ice bath, filtered and washed using cold mixture of ethanol/chloroform, to obtain 2-(1,9-diphenyl-13-(3-phenylquinoxalin-2-yl)-8,10-dioxatetracyclo(7.7.0.02,7.011,16)hexadeca-2,4,6,11,13,15-hexaen-5-yl)-3-phenylquinoxaline (Ia). The obtained compound (Ia) was used in the formation of light emitting layer in electroluminescent device. The electroluminescent device had excellent efficiency, stability and spectral characteristics.