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E-mail: shjin@pusan.ac.krReceived August 1, 2011, Accepted August 8, 2011Frechet-type dendritic benzaldehydes were efficiently synthesized using 3,5-dihydroxybenzaldehyde as analdehyde focal point functionalized unit by adding a generation to the existing dendron or direct oxidation ofFrechet-type dendritic benzyl alcohols. These dendritic benzaldehydes were applied for the construction ofdendrimers containing secondary amines as connectors via Staudinger/ aza-Wittig Reactions with α,α'-diazido-p-xylene core.Key Words : Aldehyde, Azide, Dendrimer, Staudinger/ aza-Wittig reactionIntroductionDendrons and dendrimers are the most intensely investi-gated subset of dendritic polymers. Dendrimers, which areprepared by repetition of a given set of reactions using eitherdivergent or convergent strategies, are highly branched andregular macromolecules with well-defined structures andhave served as functional objects in nanotechnology andnanoscience.

Facile Synthesis of Aldehyde-focal Fréchet Type Dendrons and Dendrimers via Staudinger/Aza-Wittig Reactions