Toward Dendrimers with Cylindrical Shape in Solution
摘要:
Three approaches for the synthesis of dendrimers with poly(p-phenylene)-PPP derived cores are described. The respective limitations of these approaches are assessed in view of the goal of this research: to make available structurally perfect, high molecular weight polymers with a dense sequence of sterically demanding dendrons.
Fréchet-type core-functionalized chiral diamine-based dendritic ligands and hybrid dendritic ligands condensed from polyether wedge and Newkome-type poly(ether-amide) supported multiple ligands were designed and synthesized. The solubility of hybrid dendrimers was found to be finely controlled by the polyether dendron. The catalytic efficiency and recovery use of dendritic ruthenium complexes were compared
Asymmetric transfer hydrogenation catalysed by hydrophobic dendritic DACH–rhodium complex in water
作者:Lin Jiang、Tong-Fei Wu、Ying-Chun Chen、Jin Zhu、Jin-Gen Deng
DOI:10.1039/b608386b
日期:——
Hydrophobic Frechet-type dendritic chiral 1,2-diaminocyclohexane-Rh(III) complexes have been applied in the asymmetric transfer hydrogenation of ketones in water using HCOONa as hydrogen source. The catalysts were found to be finely dissolved in the liquid substrates in the aqueous mixture and exhibited high catalytic activity and enantioselectivity (52-97% ee). The catalytic loading could be decreased
The self-assembly of chiral depsipeptide dendrons 4, which contain a cyanuric acid building block at their focal point, with the homotritopicHamiltonreceptor 1 is reported. The 1:3 compositions of the resulting chiral supramoleculardendrimers, the association constants K(n), and the cooperativity of binding expressed by Scatchard plots and the Hill coefficients n(H) was determined by NMR titration
Novel Chiral Dendritic Diphosphine Ligands for Rh(I)-Catalyzed Asymmetric Hydrogenation: Remarkable Structural Effects on Catalytic Properties
作者:Bing Yi、Qing-Hua Fan、Guo-Jun Deng、Yue-Ming Li、Li-Qin Qiu、Albert S. C. Chan
DOI:10.1021/ol036512a
日期:2004.4.1
series of dendritic ligands with a chiral diphosphine located at the focal point have been synthesized through coupling of pyrphos 2 with Frechet-type polyether dendron 3. The relationship between the primary structure of the dendrimer and its catalytic properties was established in the Rh-catalyzed asymmetric hydrogenation of alpha-acetamido cinnamic acid 4. A remarkable structural effect on catalytic