Dendritic macromolecules polyesters

H. Ihre, A. Hult, J. M. J. Frechet, and I. Gitsov, Double-stage convergent approach for the synthesis of functionalized dendritic aliphatic polyesters based on 2,2-bis(hydroxymethyl)propionic acid, Macromolecules, 31 (1998) 4061 1068. 

A wide range of other monomer units have been employed in the synthesis of hyperbranched macromolecules and the range of structures obtained is nearly as diverse as those for dendritic macromolecules. For example, hyperbranched polyphenylenes [93], polyesters [104, 107-109], polyethers [110-112], polyamides [113], polysilanes [114], polyetherketones [100], polycarbazoles [115], etc. [116-118] have been prepared. Interestingly, a number of groups have also used growth processes other than condensation chemistry to prepare hyper-... 

Polyester-type dendritic macromolecules and their manufacture and use. [A Hult, E. Malmstrom, M. Johansson, K. Sorensen, Swed. Pat. 468,7711993 Chem. Abstr. 119 181545] [ 418]. 

Macromolecules dendritic, 285 hyperbranched, 284-286 Main-chain liquid crystalline polymers, 49 Main-chain polyester LCP mesogenic units, 50... 

Treatment of a dendritic polyester 5 with a dendritic polyamine 6 is perhaps the simplest example of coupling between two dissimilar cascade macromolecules.178-801 Scheme 9.2 illustrates some potential products (i.e., 7 and 8) available by this general procedure, as well as a continuation of surface amidation to afford polymeric species such as random network 9. As envisioned, it would be difficult to stop this procedure after the formation of a single amide bond, due to the close proximity of adjacent ester—amine groups. 

Hyperbranched Macromolecules. Because of their close structural and synthetic similarities to dendrimers, the comparison of hyperbranched macromolecules with their dendritic analogs has been studied by a number of groups. Ihre and Hult(7i) have recently reported the synthesis and characterization of the dendritic analogs of the commercially available hyperbranched polyesters, Boltron(D(7, based on 2,2-bis(hydroxymethyl)propionic acid, while Moor iJ) has reported a novel solid-supported synthesis of hyperbranched poly(phenylacetylenes) which are the hyperbranched analogs of Moore s well studied phaiylacetylene dendrimers(id). An intriguing study was also reported by Feast into the synthesis and physical properties of hyperbranched analogues of Tomalia s poly(amidoamine) dendrimers (77). 

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