TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): The compound is prepared by condensation reaction of aromatic boronate and bromide (Suzuki reaction) as described in N. Miyaua and A. Suzuki in Chemical Reviews, Vol. 95, pp. 457-2483 (1995).Preferred Compounds: The compound is of formulae (II)-(IV).The oligomer or polymer has repeating groups (Ia) of formulae (IIa)-(IVa).Y = covalent bond, O, S or NR;R = H, halogen, 1-20C hydrocarbyl group, hydrocarbyl group substituted with heteroatom(s) containing groups containing up to 20 atoms not counting H, where the heteroatom is S, N, O, P, B or Si, halogenated or substituted derivative of hydrocarbyl group, where the substituent is a crosslinkable X group;n, n', X and Z = have meanings as defined;X' = X or divalent crosslinked remnant formed by addition polymerization of a crosslinkable X group;Y = O, S or NR. Preferred Definitions: (i)    X = moiety containing double bond, triple bond, or precursor capable of in situ formation of double bond or heterocyclic, addition polymerizable group;    (ii)    X = benzocyclobutanyl groups and substituted 6-12C arylene groups containing substituent(s) consisting of benzocyclobutane, azide, oxirane, di(hydrocarbyl)amino, cyanate ester, hydroxy, glycidyl ether, 1-4C (meth)alkylacrylate, ethenyl, ethenyloxy, perfluoroethenyloxy, ethynyl, maleimide, nadimide, tris(1-4C)-alkylsiloxy, tri(1-4C)alkylsilyl, or their halogenated derivatives;    (iii)    X = 1-benzo-3,4-cyclobutane or 4-phenyl-1-(benzo-3,4-cyclobutane);    (iv)    Z = halo, cyano, triflate, azide, -B(OR1)2, or compound of formula (1);    R1 = H or 1-10C alkyl;    R2 = 2-10 alkylene;    (v)    Ar = phenylene, and/or 9,9-di(1-20C alkyl)fluorenyl;    X = 3,4-benzocyclobutan-1-yl, ethenyl or p-ethenylphenyl;    Z = bromine or H;    n = 1 or 2;    n' = 0 or 1;    (vi)    Ar = phenylene;    X = 3,4-benzocyclobutan-1-yl;    Z = Br;    n = 1 or 2;    n' = 0;    (vii)    n = 1;    (viii)    X' = divalent crosslinked remnant formed by addition polymerization of a crosslinkable X group;    (ix)    X' = conjugated unsaturation.    EXAMPLE - To a flask were added palladium (II) acetate (196 mg) and tri(o-tolyl)phosphine (731 mg) in toluene (100 ml). The mixture was stirred at room temperature under nitrogen until palladium catalyst dissolved and the solution turned yellow. Diphenyl amine (20 g), bromo benzocyclobutane (23.8 g) and toluene (400 ml) were added, followed by sodium t-butoxide (22.8 g). The reaction was heated to reflux under nitrogen for 22 hours. It was quenched by addition of aqueous 1 M hydrochloric acid (30 ml). The toluene layer was washed with 2M sodium carbonate (100 ml), and toluene solution was passed through basic alumina. Evaporation of toluene gave a yellow oil. The product was precipitated by stirring the oil with isopropanol. The solids were collected and recrystallized from hot isopropanol to yield diphenyl benzocyclobutane amine.