𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Ring-opening polymerization of lactides using heterobimetallic yttrocene complexes

✍ Scribed by Klaus Beckerle; Kai C. Hultzsch; Jun Okuda

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
77 KB
Volume
200
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Structurally characterized, chiral heterobimetallic yttrocene derivatives Li[Y(g 5 : g 1 -C 5 R 4 Si-Me 2 NCH 2 CH 2 OMe) 2 ] (R = Me, H) have been shown to be active in the controlled ring-opening polymerization of L-lactide to give poly(L-lactide)s with high molecular weights and moderately narrow molecular weight distributions (M w /M n a 1.50). Both transesterification and racemization appear to be less prominent. 1 H NMR spectroscopic tetrad analysis of copolymers prepared using a mixture of L-and D-lactide demonstrates the absence of any preference for one enantiomer during the polymerization.

πŸ“œ SIMILAR VOLUMES

Highly Heteroselective Ring-Opening Poly
Highly Heteroselective Ring-Opening Polymerization of rac-Lactide Initiated by Bis(phenolato)scandium Complexes
✍ Haiyan Ma; Thomas P. Spaniol; Jun Okuda πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 137 KB

Currently there is considerable interest in the controlled ringopening polymerization (ROP) of lactides (LAs) by welldefined metal initiators because of the biodegradable and biocompatible nature of polylactides (PLAs) and their potentially wide-ranging commercial applications. [1, 2] Particularly i

Synthesis of dendritic–linear block copo
Synthesis of dendritic–linear block copolymers by living ring-opening polymerization of lactones and lactides using dendritic initiators
✍ D. Mecerreyes; Ph. Dubois; R. JΓ©rΓ΄me; J. L. Hedrick; C. J. Hawker πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 229 KB πŸ‘ 1 views

Polyether dendrons have been successfully used as macroinitiators for the living ring-opening polymerization (ROP) of lactones and lactides. A hydroxyl group located at the focal point of dendrimers of different generations was transformed into diethyl aluminum alkoxides by reaction with triethyl al

Polymerization of lactides and lactones.
Polymerization of lactides and lactones. IV. Ring-opening polymerization of Ξ΅-caprolactone by rare earth phenyl compounds
✍ Xianmo Deng; Minlong Yuan; Chengdong Xiong; Xiaohong Li πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 153 KB πŸ‘ 1 views

Ring-opening polymerization of -caprolactone (CL) has been initiated with rare earth phenyl compounds in both bulk and solution. These rare earth phenyl initiators can give polycaprolactone (PCL) with high yield and high molecular weight. The polymerization mechanism is through a coordination-deprot