TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The aromatic amine moiety includes at least one species represented by a formula (2). The divalent aromatic group comprises a phenylene group or a naphthylene group in the aromatic amine moiety. The monovalent aromatic group independently comprises groups represented by formula (3). The core comprises moieties represented by formula (4).Arx = a single bond or a divalent aromatic group;Ar1, Ar2 = a monovalent aromatic group;R1, R2 of formula (3) = independently a hydrogen atom, a 1-4C alkyl group, or a 1-4C alkoxy group;Z = Br, CHO.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The dendritic polymer is a dendrimer, preferably second generation or a higher generation.Preferred Condition: The repeating unit that serves as a starting point of the branching structure is further bonded to a center moiety that serves as a core.Preparation: A dendritic polymer containing tertiary amine moieties at the ends and having a structural repeating unit represented by formula (1) can be produced through the convergent method as disclosed. EXAMPLE - In a nitrogen atmosphere, dehydrated tetrahydrofuran (160 ml) was added to a mixture of methyltriphenylphosphonium bromide (42.9 g) and t-butoxypotassium (13.5 g), while the mixture was stirred at room temperature. The resultant mixture was allowed to react for 2 hours at room temperature. Subsequently, diphenylaminobenzaldehyde (10.9 g) dissolved in dehydrated tetrahydrofuran (120 ml) was added dropwise, and the mixture was allowed to react for 2 hours at room temperature. The reaction was terminated by the addition of acetone (10 ml) to the mixture. The precipitates were removed through filtration and washed with methylene chloride. The wash liquid and filtrate were combined, and the solvent was distilled off under reduced pressure, to yield a crude product. The crude product was isolated and purified through column chromatography to yield the target product of diphenylaminostyrene (10.0 g, 92%) yellow solid.