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
quest for general and efficient synthetic procedures for dendrons and dendrimers, allylphenol, allylnaphthol and 6-bromonaphthalene AB3 dendrons have been successfully prepared on a large-scale by a rapid and clean route starting from commercially available esters and allyl bromide. In contrast to the known organoiron strategy, the above-mentioned methodology enables the large-scale synthesis of AB3 dendrons
General Route from Simple Methyl, Alkyl, and Cycloalkyl Arenes to Polycyclic Cyclopentenyl Aryl Derivatives. The CpFe<sup>+</sup> Group as an Activator and Tag
CpFe(+) group activates the perallylation of the benzylic groups of arenes using KOH and allylbromide under ambient conditions. This reaction can be followed by ruthenium-catalyzed RCM metathesis using Grubbs' catalyst at room temperature to give polycyclic aromatic derivatives in high yields, and these products are easily separated from the catalyst by extraction using ether. Alternatively, the RCM metathesis
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