‘Crowned’ arborols

Abstract

Crowned' arborols are synthesized for the first time using a convergent method.The novel class of cascade molecules, arborols, have recently been of much synthetic interest. [1][2][3][4][5][6][7][8][9] have also reported a similar class of cascade molecules 'starburstdendritic' polymers.In order to increase the variety of functional groups that have been used in dendritic structures we have attempted to introduce crown ethers into arborols in the hope of producing novel properties. We expected that crown ethers would act as 'nests' in arborols and metal ions would 'perch on them like birds'. As a result, the metal binding event would induce some changes in the physical properties, We address here the first successful approach to the synthesis of 'crowned' arborols.There are two different strategies for the synthesis of

Metallodendrimers: Structural Diversity and Functional Behavior

“…Molecule 11 was prepared by Shinkai and co-workers, and the role of such molecules in peptide solubilization has been illustrated. [44,45] This molecule has been shown to function as a poly(crown ether) with no particular change in binding ability as a function of generation. Another set of dendrimers containing crown ethers have been reported by Majoral and co-workers, who reported organophosphine dendrimers similar to 8 peripherally substituted with crown ether moieties.…”

Five Generations of Nitroxyl-Functionalized Dendrimers

“…The low polydispersity and nanoscopic dimensions of well-defined functionalized dendrimers may give rise to new properties in, for example, molecular recognition, catalysis, or molecule-based electronics and optics. Functional properties can be introduced at (i) the core of the dendrimer, [2][3][4][5] (ii) as an intrinsic element of the dendritic branches, 6,7 (iii) as pendant groups at the dendrimer surface, or (iv) as noncovalently bound encapsulated guests. 8 An increasing number of dendrimers are being functionalized with stable organic radicals or redox active groups, aiming at molecules or materials with a wide variety of functional properties.…”

Intercalation of dendrimers in the interlayer of hydrotalcite clay sheets

“…The resultant molecules present a well-defined number of terminal groups and a narrow molecular weight distribution that is truly monodisperse in most cases. Owing to their structural uniformity, dendrimers provide a valuable model for correlating the macromolecular structure to the technological function [2][3][4][5]. Thus, dendrimers have a wide range of applications, including drug delivery [6], catalysis, and sensors [7][8] in high-technology fields.…”

“…The hydrotalcite is constituted from inorganic sheets that are similar to the basic structure of brucite, Mg(OH) 2 [21]. The brucite-like sheets become positively charged owing to the partial substitution of divalent metal cations by trivalent metal cations in the layer structure.…”