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Telechelic and Star-Shaped poly(L-lactide)s by Means of bismuth(III) Acetate as Initiator

Telechelic and Star-Shaped poly(L-lactide)s by Means of bismuth(III) Acetate as Initiator

Hans R Kricheldorf, Heiko Hachmann-Thiessen, Gert Schwarz

Biomacromolecules. Mar-Apr 2004;5(2):492-6.

PMID: 15003011

Abstract:

L-lactide was polymerized as concentrated solution in chlorobenzene with Bi(OAc)3 as initiator. When tetra(ethylene glycol) was added as co-initiator (CoI), telechelic polylactides having two CH-OH end groups were obtained. With 1,1,1-tri(hydroxy methyl)propane (THMP) as co-initiator, three-armed stars having three CH-OH end groups were formed. Analogously, tetrafunctional star-shaped poly(L-lactide)s were obtained with pentaerythritol as co-initiator. The chain lengths were varied via the monomer/CoI ratio. Time-conversion curves proved that Bi(OAc)3 is slightly less reactive as initiator than tin(II) 2-ethylhexanoate. However, bismuth acetate (or other carboxylates) have a particularly low toxicity as documented in the literature and by numerous Bi3+-containing pharmaceutical products.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP22306372	Bismuth(III) acetate		22306-37-2	Price

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