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Ring-opening polymerization of six-membered cyclic esters catalyzed by tetrahydroborate complexes of rare earth metals

✍ Scribed by Yuushou Nakayama; Kenta Sasaki; Naoki Watanabe; Zhengguo Cai; Takeshi Shiono

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
341 KB
Volume
50
Category
Article
ISSN
0032-3861

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✦ Synopsis

Catalytic behavior of tetrahydroborate complexes of rare earth metals, Ln(BH 4 ) 3 (THF) x (1:

), for ring-opening polymerization (ROP) of six-membered cyclic esters, d-valerolactone (VL) and D,L-lactide (D,L-LA), was studied. The controlled polymerization of VL with 1-6 proceeded in THF at 60 C. The catalytic activities of these complexes for the ROP of VL were observed to be in order of the ionic radii of the metals:

The obtained polymers were demonstrated to be hydroxytelechelic by 1 H NMR and MALDI-TOF MS spectroscopy. The controlled ROP of D,L-LA also proceeded by these complexes. The activities of these complexes for the D,L-LA ROP were also in order of the ionic radii of the metals.

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