H. Ihre, A. Hult, E. Söderlind
Jul 10, 1996
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1
Influential Citations
196
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Journal
Journal of the American Chemical Society
Abstract
Dendritic aliphatic polyesters of one, two, three, and four generations (Mw: 906, 1856, 3754, and 7549 g/mol) were synthesized in the convergent fashion, using 2,2-bis(hydroxymethyl)propionic acid as building block and 1,1,1-tris(hydroxyphenyl)ethane as core molecule. Dendrons of one to four generations were synthesized from the building block and in a final step coupled to the core molecule. The focal point of the dendrons was protected by a benzyl ester group and deprotected by catalytic hydrogenolysis. The esterifications were performed by conversion of the acid into the corresponding acid chloride and followed by reaction of the acid chloride with the hydroxyl groups in the presence of triethylamine and dimethylaminopyridine. The simplicity of the 1H-NMR and 13C-NMR spectras and elemental analyses suggest that pure and monodisperse dendrimers were obtained. Molecular self-diffusion studies of first, second, third, and fourth generation dendrimers were performed, in chloroform, using pulsed-field spin...