Effect of samarium iodide on isocyanate-polymerization by alkyllithiums

Chemistry Letters

Volumn , Issue 10, 1996, Pages 909-910

  Wang, Jia ^a   Nomura, Ryoji ^a   Endo, Takeshi ^a  

^a TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0030351645     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.1996.909     Document Type: Article

References (12)

1. For recent reviews, a) G. A. Molander and C. R. Harris, Chem. Rev., 96, 307 (1996).
2. b) T. Imamoto, Lanthanides in Organic Synthesis, Academic Press, London, Great Britain (1994).
3. c) G. A. Molander, Chem. Rev., 92, 29 (1992).
4. d) G. A. Molander, Comprehensive Organic Synthesis; ed by B. M. Trost, I. Fleming, Pergamon Press: Oxford, Great Britain (1991), Vol 1, Chapter 1.9, p 251.
5. a) T. Imamoto, Pure Appl. Chem., 62, 747 (1990).
6. b) T. Imamoto, Comprehensive Organic Synthesis; ed by B. M. Trost, I. Fleming, Pergamon Press: Oxford, Great Britain (1991), Vol 1, Chapter 1.8, p 231.
7. Quite recently, lanthanide alkoxides were reported as effective catalysts of isocyanates-polymerization. See, N. Fukuwatari, H. Sugimoto, and S. Inoue, Macromol. Rapid Commun., 17, 1 (1996).
8. G. Natta, J. DiPietro, and M. Cambini, Macromol. Chem., 56, 200 (1962).
9. Natta et al. reported that the polymerization of BuNCO with ethyllithium in THF at -78°C gave the polymer in 27 % yield, which was inconsistent with our results.
10. 8 After 7h stirring, The polymerization was quenched by methanol, and poly(N-butyl 1-nylon) was obtained by the reprecipitation with methanol.
11. 2Li for convenience.
12. 2 in THF.