TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation is given. Preferred compound: The compound (I) is of formula: (Ara-Ar21-(Ar3)o-(Ar4)p-(Ar5)q-Arb)-Xn (II) or of formula (III).Ara,Arb,Ar21,Ar3-Ar5=benzene ring, naphthalene, fluorene, chrysene, fluoranthene, benzo (b)fluoranthene, phenanthrene, dibenzophenanthrene, benzochrysene, picene, dibenzofuran or dibenzothiophene (all optionally substituted by substituent other than aryl or heteroaryl);o,p,q=0 or 1;Ar31=optionally substituted 6-100C aryl, 7-100C aralkyl, 6-100C arylamino or 5-100C heteroaryl;Ar6,Ar7=6-60C aryl, or 5-50C heteroaryl (both optionally substituted), preferably groups chosen from groups of formulae (a)-(d);R2-R9=1-20C alkyl, 3-10C cycloalkyl, 6-30C aryl, 1-20C alkoxy, 3-10C cycloalkoxy, 6-30C aryloxy, 7-40C aralkyl, 3-30C heteroaryl, mono-or di-alkylamino having 1-20C alkyl portion, 3 alkyl and/or aryl substituted silyl containing 1-20C alkyl and 6-30C aryl, mono-or di-6-30C arylamino, halo, nitro, cyano or hydroxy;e,g,h,i,k=0-4;f,j,l=0-3;Ar8=1-20C alkyl, 3-10C cycloalkyl, 6-30C aryl, 3-30C heteroaryl, or one-three 1-20C alkyl substituted 6-30C aryl;andL2-L5=single bond or optionally substituted 6-50C arylene.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The polymer has repeating unit of formula (VIII) or (IX).r=number of repeating units. EXAMPLE - (In g) (6-(3-(phenanthren-9-yl)-5-(prop-1-en-2-yl)phenyl)naphthalen-2-yl)boranediol (5.6), 2,6-dibromonaphthalene (3.14), dimethoxyethane (100 ml) and 2 mol/l sodium carbonate aqueous solution (50 ml) and tetrakis(triphenylphosphine) palladium (1.0) were stirred for 8 hours. The solid obtained was filter-separated and washed to obtain 9-(3-(6-(6-bromonaphthalen-2-yl)naphthalen-2-yl)-5-(prop-1-en-2-yl)phenyl)phenanthrene (5.3) with yield of 70%. The bromo compound (12.5) was reacted with 4-vinyl phenyl boronic acid (3.0) to obtain 9-(3-(6-(6-(4-vinyl phenyl)naphthalen-2-yl)naphthalen-2-yl)-5-(prop-1-en-2-yl)phenyl)phenanthrene (10.3) with yield of 78%. The obtained compound was polymerized to obtain polymer with mean molecular weight of 5500 and molecular weight distribution of 1.4.