Divergent dendrimer synthesis: ..

Another approach can be the addition of layers or generations to the end group non-covalently. The above mentioned methods resemble convergent and divergent dendrimer synthesis 34, 39, 41. The addition of layers or generations via recognition units on the branched monomer inside the dendrimer can be another approach which could be equivalent to grafting of dendrons onto specific reactive sites.

Dendrimers are conventionally synthesized by divergent [15–22] and convergent [23–26] methods.

FIGURE 3: SCHEMATIC REPRESENTATION OF A COMBINED CONVERGENT - DIVERGENT SYNTHESIS TECHNIQUE, WHERE THE FOCAL POINT (Y) OF BRANCHED MONOMER AND TERMINAL GROUP (Z) ARE PROTECTED WITH PROTECTING GROUP A AND B RESPECTIVELY. SUITABLE DEPROTECTION TECHNIQUE THEN PRODUCES DUALLY PROTECTED DENDRON AND FINALLY A COMPLETE DENDRITIC STRUCTURE


Divergent Synthesis of Polyester Type Dendrimers Containing ..

Double Exponential’ and ‘Mixed’ Growth: The most recent fundamental breakthrough in the practice of dendrimer synthesis has come with the concept and implications of 'double exponential' growth. Double exponential growth, similar to a rapid growth technique for linear polymers, involves an AB2 monomer with orthogonal protecting groups for the A and B functionalities. This approach allows the preparation of monomers for both convergent and divergent growth from a single starting material8.


Convergent dendrimer synthesis by olefin metathesis and studies ..

N2 - A divergent synthetic scheme was developed for the preparation of high branching functionality hybrid polymers from carbosilane dendrimer substrates and polybutadiene side chains. Carbosilane dendrimers with 32, 64, or 128 peripheral Si-Cl functional groups were first couple, with 1,2- polybutadienyllithium chains having a number-average molecular weight M n ≈ 1000. The polybutadienc-grafted substrates were then hydrosilylated with dichloromethylsilane and reacted with high 1,4-microstructure content polybutadienyllithium chains to generate high branching functionality dendrimer - arborescent hybrids. Three series of hybrid polymers were synthesized containing 1,4-polybutadiene side chains with M n ≈ 1500, 5000, or 30 000. Size exclusion chromatography analysis of the polymers confirmed that a narrow molecular weight distribution was maintained (Mw/Mn

Canadian Journal of Chemistry, ..

AB - Novel surface-block dendrimer was synthesized via a divergent/convergent approach using [4+4] 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.

referred to as convergent or divergent

AB - A divergent synthetic scheme was developed for the preparation of high branching functionality hybrid polymers from carbosilane dendrimer substrates and polybutadiene side chains. Carbosilane dendrimers with 32, 64, or 128 peripheral Si-Cl functional groups were first couple, with 1,2- polybutadienyllithium chains having a number-average molecular weight M n ≈ 1000. The polybutadienc-grafted substrates were then hydrosilylated with dichloromethylsilane and reacted with high 1,4-microstructure content polybutadienyllithium chains to generate high branching functionality dendrimer - arborescent hybrids. Three series of hybrid polymers were synthesized containing 1,4-polybutadiene side chains with M n ≈ 1500, 5000, or 30 000. Size exclusion chromatography analysis of the polymers confirmed that a narrow molecular weight distribution was maintained (Mw/Mn