Fourth-generation dendrimers

Frdchet et al. reported the synthesis of a unimolecular micelle (Fig. 6) generated by a convergent approach starting with 3,5-dihydroxybenzyl alcohol, as the key branched monomer unit [65]. Fourth generation dendrimer 15 with 32 carboxylic acid moieties on the periphery was synthesized and its correspond-... 

Moss and Liao [182,183] reported a metallo-dendrimer built by a convergent strategy. An approach similar to that of Frechet was used to synthesize a fourth generation dendrimer containing 48 peripheral ruthenium atoms. 

In water, the third-generation (16) and fourth-generation dendrimers (17) induced chirality toward the (S)-enantiomer (50% ee for 16 and 98% ee for 17). In THF high enantiomeric excess was achieved only with the third-generation dendrimer (99% (S) ee for 16 and 3% (S) ee for 17). Dendrimer 16 was recovered from the heterogeneous reaction mixture by nanofiltration on a Millipore microporous membrane system. After regeneration of the catalytic activity by treatment with... 

Figure 4.10. Fourth-generation dendrimer with porphyrin core.

Figure 6.7 (a) Structural formula of the fourth-generation dendrimer 7 containing at its... 

Figure 6.11 Structural formulas of the fourth-generation dendrimers terminated with 64 metal complexes [Ru(bpy)3]2+ (14),54a,d [Ru(tpy)2]2+ (15),54 and [Co(tpy)212 1 (16).56...

For example, Kaifer et al. decorated the periphery of a POPAM dendrimer with ferrocene and cobaltocenium units. Such a fourth-generation dendrimer (Fig. 4.4) proved to be a suitable guest system - with numerous docking sites -for /9-cyclodextrin as host compound (see Section 8.3.6) [8]. 

Fig. 6.9 Pseudorotaxane-terminated fourth-generation dendrimer (according to Kim et a. )...

Fig. 41 Variation of the size of the elementary third and fourth generations dendrimer cylinder with bulky mesogenic groups. L3, Lg and Lg are for the bulky groups containing 3, 6 and 9 terminal aliphatic chains, respectively, h is the height of the cylinder, the diameter, and

Dumbbell copolymers were also synthesized by Frechet et al.165 A difunctional PS living chain, prepared in THF using potassium naphthalenide as initiator, was end-capped with DPE and subsequently reacted with a fourth-generation dendrimer having a bromomethyl group at its converging point (Scheme 78). 

FIGURE 5.1 Schematic representation of a fourth-generation dendrimer with a trifunctional... 

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