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A carbosilane dendrimer with 12 peripheral iodoarene groups, Si{(CH2)3{Si(CH2)3O2C(C6H4I-4)}3}4 (G1-ArI, 5), and the corresponding G0 model compound, Si{(CH2)3O2CC6H4I-4}4 (G0-ArI, 4) have been prepared from polyol precursors. These compounds react with Pd(dba)2/tmeda (dba = dibenzylideneacetone, tmeda = N,N,N',N'-tetramethylethylenediamine) to yield\udperiphery-palladated complexes, Si{(CH2)3O2C(C6H4-4)PdI(tmeda)}4 (G0-ArPdI(tmeda), 6) and\udSi{(CH2)3{Si(CH2)3O2C(C6H4-4)PdI(tmeda)}3}4 (G1-ArPdI(tmeda), 7). Dendrimer 7 represents the first example of an exclusively sigma-bonded completely periphery-palladated dendrimer. Reactions of the model palladium(II) complexes PdI(EtO2C(C6H4)-4)(tmeda) (2) and\udPdI(EtO2C(C6H4)-4)(bpy) (3) (bpy = 2,2'-bipyridyl) with the transmetalation reagents LiMe and SnMe4 were not successful, while no reaction occurred with the related reagent Sn(C~N)Me3 [C~N = 8-(dimethylamino)-1-naphthyl]. The molecular structure of G0-ArI (5) has been determined by X-ray crystallography and has C2v symmetry in the solid state

organometallics

Organopalladium-Functionalized Dendrimers: Insertion of Palladium(0) into Peripheral Carbon−Iodine Bonds of Carbosilane Dendrimers Derived from Polyols. Crystal Structure of Si{(CH2)3O2CC6H4I-4}4