Styrene poly dendrons

Ru(CO)(den-por) (den-por=dendritic porphyrins). These are made by condensation of Ru(CO)L (L=5,10,15,20-tetrato(4 -hydroxyphenyl)porphyrin or 5,10,15,20-tetrakis(3, 5 -dihydroxy-phenyl)porphyrin), themselves made from RUjlCO) and (L), with poly-(benzylether) dendrons H, C NMR, electronic and IR spectra of the products were measured. Epoxidation of cyclic alkenes, cis- and tranx-sfilbene, styrene and its 3-methyl, methoxy, chloro and bromo derivatives, dimethylchromene and of cholesteryl esters in high yields and turnovers was effected by RulCOKden-porl/lCl pyNOl/CHjClj [871]. 

GAO Gao, M., Jia, X., Kuang, G., Li, Y., Liang, D., and Wei, Y., Thermo- and pH-responsive dendronized copolymers of styrene and maleic anhydride pendant with poly(amidoamine) dendrons as side groups. Macromolecules, 42, 4273, 2009. 

Poly[(styrene-a//-maleic anhydride)-g-poly(amidoamine) dendrons] water 2009GAO... 

One of the most comprehensive examinations of dendritic nanoscale amphiphiles involved structures that mimicked traditional surfactants. This work was reported in a thesis by van Hest et al. [126] [166]. In this study, extensive hydrophobic tails were precisely constructed by the living anionic polymerization of styrene, followed by termination with a primary amine function. Dendronization of these amine functionalized poly(styrenes) produced focal point functionalized, hydrophobically substituted PPI dendrons, as illustrated later (Figure 23). More specifically, the living polystyrene anion is terminated with ethyleneoxide, thus providing a hydroxyl terminated poly(styrene) with... 

Figure23 Linear-poly(styrene), focal point functionalized poly(propyleneimine) (PPI) dendrons G = 4.0.

Very interesting amphiphilic behavior at the air-water interface was observed by van Hest [126] for hydrophobe (focal point) modified poly(propyleneimine) (PPI) dendrons (i.e., poly(styrene)-de (in-PPl (NH2) where n = 2,4,8)(6). These dendritic amphiphiles were essentially a reverse version of the Frdchet examples (see above). Only PS-den(in-PPl-(NH2) with n = 8 and 16 (i.e., G = 3 and 4) exhibited normal pressure-area isotherms. The lower generations (i.e., G = 1 and 2) all displayed isotherm curves indicating they transitioned directly to solid state behavior. 

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