221208-75-9Relevant academic research and scientific papers
Enhanced catalytic activity in suzuki-miyaura couplings by shell crosslinked pd nanoparticles from alkene-terminated phosphine dendron-stabilized Pd nanoparticles
Shiomi, Toshiaki,Nakahodo, Tsukasa,Fujihara, Hisashi
, p. 1700 - 1702 (2012)
New alkene-terminated phosphine dendron-protected palladium nanoparticles (NPs) have been synthesized, and the olefin metathesis polymerization of their Pd NPs led to shell crosslinked Pd NPs without aggregation of the Pd NPs. The introduction of crosslinking at the surface of the protective ligand enhanced the catalytic activity of the Pd NPs for SuzukiMiyaura couplings.
Molecular Imprinting Inside Dendrimers
Zimmerman, Steven C.,Zharov, Ilya,Wendland, Michael S.,Rakow, Neal A.,Suslick, Kenneth S.
, p. 13504 - 13518 (2007/10/03)
Synthetic hosts capable of binding porphyrins have been produced by a mixed-covalent-noncovalent imprinting process wherein a single binding site is created within cross-linked dendrimers. Two synthetic hosts were prepared, using as templates 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin and 5,10,15,20-tetrakis(3,5-dihydroxyphenyl)porphyrin. These two templates were esterified with, respectively, fourth- and third-generation Frechet-type dendrons containing homoallyl end-groups. The resulting tetra-and octadendron macromolecules underwent the ring-closing metathesis reaction using Grubbs' Type I catalyst, RuCl2(P(C6H5) 3)2(CHCH2C6H5), to give extensive interdendron cross-linking. Hydrolytic removal of the porphyrin cores afforded imprinted hosts whose ability to bind porphyrins with various peripheral substituents was investigated by UV-visible spectrophotometric titrations and size exclusion chromatography. The results indicate a high yield of imprinted sites that show high selectivity for binding of porphyrins capable of making at least four hydrogen bonds, but only a moderate degree of shape selectivity.
