AbstractWe report the first successful allylation of aromatic esters by allyltrimethylsilane. The reaction is mediated by 0.3–1.0 equiv. of titanium tetrachloride (TiCl4) at room temperature and leads in a multi‐step, one‐pot reaction to quaternary triallylmethane derivatives 5. The most efficient ester possessed two ortho‐methoxy substituents on the phenol ring. Molecular modelling revealed the ability of this compound to form a bidentate titanium complex, thus improving the steric accessibility of the ester carbonyl to nucleophilic attack.magnified image
Peripheral functionalisation of dendrimers with polyoxotungstate complexes assembled by ionic bonding and their use as oxidation catalysts: Influence of the tether length
作者:Sylvain Nlate、Lauriane Plault、Didier Astruc
DOI:10.1039/b616288f
日期:——
poly-ammonium salts. Reactions of the latter with H3PW12O40 in the presence of hydrogenperoxide led to dendrimers containing PO4[WO(O2)2]4}3− species at the periphery. These compounds are efficient catalysts for the selectiveoxidation of alkenes, sulfides and alcohols in an aqueous–CDCl3 biphasic system, using hydrogenperoxide as the primary oxidant. The complexes with dendritic wedges directly bonded
2,4,9‐Triazaadamantanes with “Clickable” Groups: Synthesis, Structure and Applications as Tripodal Platforms
作者:Artem N. Semakin、Yulia V. Nelyubina、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.202000832
日期:2020.11.22
2,4,9‐Triazaadamantanes (TRIADs) are a poorly investigated class of hetrocage molecules, which have the potential for applications as synthetic platforms. Here, comprehensive studies on the synthesis, structure and stability of TRIADs were performed. Facile modification of bridge N‐positions in TRIADs through different click‐strategies demonstrates the versatile characteristics of this new 3D scaffold
Hydrozirconation of first-generation allyl-functionalized dendrimers and dendrimer model compounds
作者:Reinout Meijboom、John R. Moss、Alan T. Hutton、Tracy-Ann Makaluza、Selwyn F. Mapolie、Fazlin Waggie、Mark R. Domingo
DOI:10.1016/j.jorganchem.2004.03.010
日期:2004.6
Several allyl-functionalized dendrimers and mono-functional model compounds have been prepared. These have been hydro-zirconated using [Cp2ZrHCl](x) to give zirconocene terminated dendrimers. These dendrimers have been characterized using spectroscopic techniques. particularly NMR. (C) 2004 Elsevier B.V. All rights reserved.
Synthesis of Dendritic Polyoxometalate Complexes Assembled by Ionic Bonding and Their Function as Recoverable and Reusable Oxidation Catalysts
AbstractWe report the first successful allylation of aromatic esters by allyltrimethylsilane. The reaction is mediated by 0.3–1.0 equiv. of titanium tetrachloride (TiCl4) at room temperature and leads in a multi‐step, one‐pot reaction to quaternary triallylmethane derivatives 5. The most efficient ester possessed two ortho‐methoxy substituents on the phenol ring. Molecular modelling revealed the ability of this compound to form a bidentate titanium complex, thus improving the steric accessibility of the ester carbonyl to nucleophilic attack.magnified image