Isotactic polymerization of methyl methacrylate using a prochiral, zirconium enolate initiator

Macromolecules

Volumn 33, Issue 5, 2000, Pages 1508-1510

  Nguyen, Hoa ^a   Jarvis, Adam P ^a   Lesley, M J G ^a   Kelly, W Mark ^a   Reddy, Srinivasa S ^a   Taylor, Nicholas J ^a   Collins, Scott ^a  

^a UNIVERSITY OF WATERLOO   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

INITIATORS (CHEMICAL); NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; POLYMERIZATION; POLYMETHYL METHACRYLATES; SYNTHESIS (CHEMICAL); ZIRCONIUM;

LANTHANOCENE; METHYL METHACRYLATES;

MONOMERS;

EID: 0033908001     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma991797l     Document Type: Article

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24. 2).
25. 2).
26. w = 3.83%.
27. 2).
28. Brookhart, M.; Grant, B.; Volpe, A. F. Organometallics 1992, 11, 3290.
29. 2).
30. 2).
31. Preliminary results suggest that the major, Zr product is a cationic, carboxylate complex.
32. 8, decomposing at temperatures above -20 ° C. Presumably it is also more thermally stable in MMA solution.
33. A small amount of partially s-PMMA is formed under these conditions (entry 4). We suspect this arises from stoichiometric imbalance of 3 and 7 as deliberate use of excess 3 also leads to (increased) formation of s-PMMA (Table 1, entry 5).
34. 2O derived from oxonium acid 7.
35. 2 as initiator; in that case, alternating insertion of MMA was proposed-see ref 1d.
36. 4] as s-PMMA is partially formed in addition to i-PMMA under these conditions (Table 1, entry 5).