Varying Topology of Dendrimers − A New Approach toward the Synthesis of Di-Block Dendrimers

Maraval, Valérie; Sebastián, Rosa Marı́a; Ben, Frédéric; Laurent, Régis; Caminade, Anne‐Marie; Majoral, Jean‐Pierre

doi:10.1002/1099-0682(200107)2001:7<1681::aid-ejic1681>3.0.co;2-t

Cited by 29 publications

(32 citation statements)

References 41 publications

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“…A small Janus dendrimer was synthesized with four phenyl groups on one side and four aldehydes on the other side; the aldehydes were then used for the growing of dendritic branches, up to the third generation. The final compound is a Janus dendrimer having 16 aldehydes on one side, and four phenyl groups on the other side [75].…”

Section: Dendrons For the Synthesis Of Non-symmetrical Dendrimers (Tymentioning

confidence: 99%

Bifunctional Phosphorus Dendrimers and Their Properties

Caminade

Majoral

2016

Molecules

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Dendrimers are hyperbranched and monodisperse macromolecules, generally considered as a special class of polymers, but synthesized step-by-step. Most dendrimers have a uniform structure, with a single type of terminal function. However, it is often desirable to have at least two different functional groups. This review will discuss the case of bifunctional phosphorus-containing dendrimers, and the consequences for their properties. Besides the terminal functions, dendritic structures may have also a function at the core, or linked off-center to the core, or at the core of dendrons (dendritic wedges). Association of two dendrons having different terminal functions leads to Janus dendrimers (two faces). The internal structure can also possess functional groups on one layer, or linked to one layer, or on several layers. Finally, there are several ways to have two types of terminal functions, besides the case of Janus dendrimers: either each terminal function bears two functions sequentially, or two different functions are linked to each terminal branching point. Examples of each type of structure will be given in this review, as well as practical uses of such sophisticated structures in the fields of fluorescence, catalysis, nanomaterials and biology.

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Section: Dendrons For the Synthesis Of Non-symmetrical Dendrimers (Tymentioning

confidence: 99%

Bifunctional Phosphorus Dendrimers and Their Properties

Caminade

Majoral

2016

Molecules

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“…Methylhydrazine, Ph 2 PCH 2 OH, and iron carbonyle are successively added to 40-G 1 G 0 , to finally afford compound 41-G 1 G 0 . This compound possesses 4 ammonium groups on one side, ensuring the solubility in water, and two iron complexes on the other side (Scheme 27) [56].…”

Section: -Gmentioning

confidence: 99%

“…The building was carried out up to the third generation, applying the method of synthesis already shown on Scheme 7. The resulting very unsymmetrical compound 42-G 1 G 3 possesses four phenoxy groups on one side, and sixteen aldehyde groups on the other side, which might be used for further reactions (Scheme 28) [56].…”

Section: -Gmentioning

confidence: 99%

Synthetic Pathways Towards Phosphorus Dendrimers and Dendritic Architectures

Caminade¹,

Turrin²,

Laurent³

et al. 2006

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The methods of synthesis of dendrimers and dendritic macromolecules possessing phosphorus derivatives at each branching points are reviewed. Classical methods using the repetition of two steps are first described, then various ways usable to shorten the time needed for the synthesis are emphasized. These improvements include the use of accelerated methods (one step for one generation), and of dendrons (dendritic wedges) to increase rapidly the number of generations. Beside classical dendrimers constituted by only one type of branches and one type of functional end groups, more sophisticated dendritic structures are described. In particular, up to 4 types of functional end groups can be grafted to each divergent point of the surface, or two types of functional groups can be located at the end of particular branches of special dendritic species. In the latter case, the dendritic species are obtained either by reacting functional groups included at particular layers of a main dendrimer, or taking advantage of the reactivity of the function located at the core of dendrons.

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“…[1][2][3][4][5] Since the physicochemical properties of dendrimers depend remarkably on their structural characteristics, there is an increasing emphasis on syntheses of surface-block dendrimers, which have a spherical shape where the surface character of one hemisphere is different from that of the other, in order to provide future development of dendrimer-based smart materials. [6][7][8][9][10][11][12][13][14][15] Recently, Percec and co-workers reported a new concept to provide bilayered supramolecular architectures; the Janus-dendritic system. 16 Several methods of preparation of surface-block dendrimers have already been developed: a convergent approach, [7][8][9] a divergent/convergent approach, 10,11 and a divergent/divergent approach.…”

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“…16 Several methods of preparation of surface-block dendrimers have already been developed: a convergent approach, [7][8][9] a divergent/convergent approach, 10,11 and a divergent/divergent approach. [12][13][14][15] Although the divergent/convergent approach is quite useful for combinatorial synthesis of surface-block dendrimers, only a few examples have been reported so far. Furthermore, the formation of surface-block dendrimer by the use of photoreaction of the focal point of two different hemispherical dendrons has never been described.…”

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confidence: 99%

Novel Synthesis of Surface-Block Dendrimer Using [4+4] Photocycloaddition of Anthryl Dendrons

Yanagimoto

Takaguchi

Tuboi

2006

Polym J

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ABSTRACT:Novel surface-block dendrimer was synthesized via a divergent/convergent approach using ½4þ4 photocycloaddition of two different anthracenes bearing a newly designed dendritic substituent, of which terminal groups are long alkyl chains for one hemisphere and oligo(ethylene oxide) chains for the other hemisphere. A solution of the two different anthryl dendrons was irradiated with a high-pressure mercury lamp to afford a hetero-dimer, which consists of the two different dendrons. The surface-block dendrimer was isolated by the use of size exclusion chromatography (SEC) and well characterized by NMR spectrum, SEC, and MALDI-TOF-Mass spectrum. Furthermore, this paper describes a ratio of the photoproducts (the hetero-dimer and two homo-dimers) that were obtained from the photocycloaddition reactions carried out in neat and an emulsion condition, along with the solution.

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Varying Topology of Dendrimers − A New Approach toward the Synthesis of Di-Block Dendrimers

Abstract: A new way to synthesise di-block dendrimers having two types of end groups located in two different areas of their surface is reported. It consists in growing, step-by-step, a se-

Cited by 29 publications

References 41 publications

Bifunctional Phosphorus Dendrimers and Their Properties

Bifunctional Phosphorus Dendrimers and Their Properties

Synthetic Pathways Towards Phosphorus Dendrimers and Dendritic Architectures

Novel Synthesis of Surface-Block Dendrimer Using [4+4] Photocycloaddition of Anthryl Dendrons

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