6363-97-9Relevant academic research and scientific papers
Size-Selective Yolk-Shell Nanoreactors with Nanometer-Thin Porous Polymer Shells
Jia, Ying,Shmakov, Sergey N.,Register, Paul,Pinkhassik, Eugene
supporting information, p. 12709 - 12714 (2015/09/01)
Yolk-shell nanoreactors with metal nanoparticle core and ultrathin porous polymer shells are effective catalysts for heterogeneous reactions. Polymer shells provide size-selectivity and improved reusability of catalyst. Nanocapsules with single-nanometer porous shells are prepared by vesiclelated directed assembly. Metal nanoparticles are formed either by selective initiation in pre-fabricated nanocapsules or simultaneously with the creation of a crosslinked polymer shell. In this study, we investigated the oxidation of benzyl alcohol and benzaldehyde catalyzed by gold nanoparticles and hydrogenation of cyclohexene catalyzed by platinum nanoparticles. Comparison of newly created nanoreactors with commercially available nanoparticles revealed superior reusability and size selectivity in nanoreactors while showing no negative effect on reaction kinetics.
Starburst Polyether Dendrimers
Padias, Anne Buyle,Hall, H. K.,Tomalia, Donald A.,McConnell, J. R.
, p. 5305 - 5312 (2007/10/02)
The synthesis of two starburst polyether dendrimers, by a protection-deprotection scheme, is described.A bicyclic ortho ester or a dioxane is used to temporarily mask three or two hydroxyl groups, respectively.Dendrimer type I was synthesized with a pentaerythritol core and a hydroxymethyl bicyclic orthoformate as the dendrimer synthon, while in dendrimer type II, 1,1,1-tris(hydroxymethyl)ethane and a (hydroxymethyl)dioxane were used.Dendrimer type I is the most compact starburst molecule synthesized to date.No spacer groups or excess reagent are needed in the synthesis, even though all reactions occur at neopentyl positions.In just three generations, 108 functionalities are present in the exterior layer.The size of these molecules calculated from CPK models is in excellent agreement with the data obtained from size-exclusion chromatography.
