Discrete yttrium(III) complexes as lactide polymerization catalysts

Macromolecules

Volumn 32, Issue 7, 1999, Pages 2400-2402

  Chamberlain, Bradley M ^a   Sun, Yongping ^a   Hagadorn, John R ^a   Hemmesch, Eric W ^a   Young Jr , Victor G ^a   Pink, Maren ^a   Hillmyer, Marc A ^a   Tolman, William B ^a  

^a University of Minnesota   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; CRYSTAL ATOMIC STRUCTURE; MOLECULAR STRUCTURE; MOLECULAR WEIGHT DISTRIBUTION; RING OPENING POLYMERIZATION; YTTRIUM COMPOUNDS;

POLYLACTIDE;

POLYESTERS;

EID: 0033528629     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma990005k     Document Type: Article

References (31)

1. Selected references: (a) Müller, H. M.; Seebach, D. Angew. Chem., Int. Ed. Engl. 1993, 32, 477-502.
2. (b) Vert, M. Makromol. Chem. Symp. 1986, 6, 109.
3. (c) Neuwenhuis, J. Clin. Mater. 1992, 10, 59.
4. (d) Vert, M.; Li, S. N.; Spenlehauer, G.; Guèrin, P. J. J. Mater. Sci., Pure Appl. Chem. 1995, A32, 787-796.
5. For example see: (a) Spassky, N.; Wisniewski, M.; Pluta, C.; Le Borgne, A. Macromol. Chem. Phys. 1996, 197, 2627-2637.
6. (b) Penczek, S.; Duda, A.; Libiszowski, J. Macromol. Symp. 1998, 128, 241-254.
7. (c) Trofimoff, L.; Aida, T.; Inoue, S. Chem. Lett. Chem Soc. Jpn. 1987, 991-994.
8. (a) Simic, V.; Spassky, N.; Hubert-Pfalzgraf, L. G. Macromolecules 1997, 30, 7338-7340.
9. (b) Stevels, W. M.; Ankone, M. J. K.; Dijkstra, P. J.; Feijen, J. Macromol. Chem. Phys. 1995, 196, 1153-1161.
10. (c) Stevels, W. M.; Ankone, M. J. K.; Dijkstra, P. J.; Feijin, J. Macromolecules 1996, 29, 3332-3333.
11. (d) Yasuda, H.; Furo, M.; Yamamoto, H.; Nakamura, A.; Miyake, S.; Kibino, N. Macromolecules 1992, 25, 5115.
12. (e) McLain, S. J.; Ford, T. M.; Drysdale, N. E. Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 1992, 2, 463-464.
13. (f) Stevels, W. M.; Ankone, M. J.; Dijkstra, P. J.; Feijin, J. Macromolecules 1996, 29, 6132-6138.
14. (g) Le Borgne, A.; Pluta, C.; Spassky, N. Macromol. Rapid. Commun. 1995, 196, 955.
15. Robb, J.; Peacock, R. D. Inorg. Chim. Acta 1986, 121, L15-L17.
16. Fallis, I. A.; Farrugia, L. J.; Macdonald, N. M.; Peacock, R. D. J. Chem. Soc., Dalton Trans. 1993, 2759-2763.
17. Huekens, J.; Sherry, A. D. J. Chem. Soc., Chem. Commun. 1997, 845-846.
18. Wainwright, K. P. Coord. Chem. Rev. 1997, 166, 35-90.
19. Synthetic procedures and characterization data for all compounds are provided in the Supporting Information.
20. 1H NMR).
21. 3, Z = 1. For further details, see the Supporting Information.
22. (a) Belal, A. A.; Farrugia, L. J.; Peacock, R. D.; Robb, J. J. Chem. Soc., Dalton Trans. 1989, 931-935.
23. (b) Belal, A. A.; Fallis, I.; Farrugia, L. J.; Macdonald, N. M.; Peacock, R. D. J. Chem. Soc. Chem. Commun. 1991, 402-403.
24. (c) Farrugia, L. J.; Macdonald, N. M.; Peacock, R. D.; Robb, J. Polyhedron 1995, 14, 541-545.
25. (d) Belal, A. A.; Chaudhuri, P.; Fallis, I. A.; Farrugia, L. J.; Hartung, R.; Macdonald, N. M.; Nuber, B.; Peacock, R. D.; Weiss, J.; Wieghardt, K. Inorg. Chem. 1991, 30, 4397-4402.
26. (e) Parrugia, L. J.; Fallig, I. A.; Macdonald, N. M.; Peacock, R. D. Inorg. Chem. 1993, 32, 779-780.
27. (f) Farrugia, L. J.; Peacock, R. D. Acta Crystallogr. 1991, C47, 1312.
28. Some of the GPC traces were bimodal. This is presumably a result of efficient transesterification in competition with ring-opening polymerization. See: Baran, J.; Duda, A.; Kowlaski, A.; Szymanski, R.; Penczek, S. Macromol. Rapid Commun. 1997, 18, 325-333.
29. The initiation may occur through insertion of an alkoxide from the ligand into lactide, but experimental evidence is lacking. Although variable initiator efficiency may be responsible for the inability to systematically control molecular weight in polymerizations with 1 and 2, further studies (including absolute molecular weight determinations) will be necessary before the initiator efficiency can be adequately defined.
30. Thakur, K A. M.; Kean, R. T.; Hall, E. S.; Kolstad, J. J.; Lindgren, T. A.; Doscotch, M. A.; Siepmann, J. I.; Munson, E. J. Macromolecules 1997, 30, 2422-2428.
31. So far, attempts to assess the effect of the coordinated water by stirring solutions of 3 with molecular sieves or heating the solid under vacuum (90 °C, 8 h, 0.1 Torr) have failed to remove the aquo ligand.