Universal iterative strategy for the divergent synthesis of dendritic macromolecules from conventional monomers by a combination of living radical polymerization and irreversible TERminator multifunctional INItiator (TERMINI)

Journal of the American Chemical Society

Volumn 125, Issue 21, 2003, Pages 6503-6516

  Percec, Virgil ^a   Barboiu, Bogdan ^a   Grigoras, Cristian ^a   Bera, Tushar K ^a  

^a UNIVERSITY OF PENNSYLVANIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

BRANCHING POINT;

CATALYST ACTIVITY; ITERATIVE METHODS; MONOMERS; POLYMERIZATION; SYNTHESIS (CHEMICAL);

MACROMOLECULES;

(1,1 DIMETHYLETHYL)[[1 [3,5 BIS(S PHENYL 4 N,N' DIETHYLTHIOCARBAMATE)PHENYL]ETHENYL]OXY]DIMETHYLSILANE; METAL COMPLEX; METHACRYLIC ACID METHYL ESTER; MONOMER; UNCLASSIFIED DRUG;

ARTICLE; COMPLEX FORMATION; MACROMOLECULE; POLYMERIZATION; QUANTITATIVE ANALYSIS; REACTION ANALYSIS; SYNTHESIS; TECHNIQUE; TERMINATOR MULTIFUNCTIONAL INITIATOR;

EID: 0037500047     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja034746j     Document Type: Article

References (65)

1. Percec, V.; Ahn, C.-H.; Ungar, G.; Yeardley, D. J. P.; Möller, M.; Sheiko, S. S. Nature 1998, 391, 161.
2. (a) Percec, V.; Johansson, G.; Ungar, G.; Zhou, J. J. Am. Chem. Soc. 1996, 118, 9855.
3. (b) Balagurusamy, V. S. K.; Ungar, G.; Percec, V.; Johansson, G. J. Am. Chem. Soc. 1997, 119, 1523.
4. (c) Hudson, S. D.; Jung, H.-T.; Percec, V.; Cho, W.-D.; Johansson, G.; Ungar, G.; Balagurusamy, V. S. K. Science 1997, 278, 449.
5. (d) Percec, V.; Cho, W.-D.; Ungar, G.; Yeardley, D. J. P. J. Am. Chem. Soc. 2001, 123, 1302.
6. (e) Percec, V.; Cho, W.-D.; Ungar, G.; Yeardley, D. J. P. Chem. Eur. J. 2002, 8, 2011.
7. (f) Percec, V.; Bera, T. K.; Glodde, M.; Fu, Q.; Balagurusamy, V. S. K.; Heiney, P. A. Chem. Eur. J. 2003, 9, 921.
8. (a) Percec, V.; Glodde, M.; Bera, T. K.; Miura, Y.; Balagurusamy, V. S. K.; Shiyanovskaya, I.; Singer, K. D.; Heiney, P. A.; Schnell, I.; Rapp, A.; Spiess, H.-W.; Hudson, S. D.; Duan, H. Nature 2002, 419, 384.
9. (b) Ungar, G.; Liu, Y.; Zeng, X.; Percec, V.; Cho, W.-D. Science 2003, 299, 1208.
10. For a review on convergent synthesis see: (a) Grayson, S. M.; Fréchet, J. M. J. Chem. Rev. 2001, 101, 3819. For pioneering work on convergent synthesis see: (b) Hawker, C. J.; Fréchet, J. M. J. J. Am. Chem. Soc. 1990, 112, 7638. (c) Miller, T. M.; Neenan, T. X. Chem. Mater. 1990, 2, 346. (d) Moore, J. S.; Xu, Z. Macromolecules 1991, 24, 5893.
11. For a review on convergent synthesis see: (a) Grayson, S. M.; Fréchet, J. M. J. Chem. Rev. 2001, 101, 3819. For pioneering work on convergent synthesis see: (b) Hawker, C. J.; Fréchet, J. M. J. J. Am. Chem. Soc. 1990, 112, 7638. (c) Miller, T. M.; Neenan, T. X. Chem. Mater. 1990, 2, 346. (d) Moore, J. S.; Xu, Z. Macromolecules 1991, 24, 5893.
12. For a review on convergent synthesis see: (a) Grayson, S. M.; Fréchet, J. M. J. Chem. Rev. 2001, 101, 3819. For pioneering work on convergent synthesis see: (b) Hawker, C. J.; Fréchet, J. M. J. J. Am. Chem. Soc. 1990, 112, 7638. (c) Miller, T. M.; Neenan, T. X. Chem. Mater. 1990, 2, 346. (d) Moore, J. S.; Xu, Z. Macromolecules 1991, 24, 5893.
13. For a review on convergent synthesis see: (a) Grayson, S. M.; Fréchet, J. M. J. Chem. Rev. 2001, 101, 3819. For pioneering work on convergent synthesis see: (b) Hawker, C. J.; Fréchet, J. M. J. J. Am. Chem. Soc. 1990, 112, 7638. (c) Miller, T. M.; Neenan, T. X. Chem. Mater. 1990, 2, 346. (d) Moore, J. S.; Xu, Z. Macromolecules 1991, 24, 5893.
14. (a) Percec, V.; Barboiu, B. Macromolecules 1995, 28, 7970.
15. (b) Percec, V.; Barboiu, B.; Neumann, A.; Ronda, J. C.; Zhao, M. Macromolecules 1996, 29, 3635.
16. For two representative publications that demonstrate the scope and capabilities of sulfonyl chloride initiators see: (a) Percec, V.; Kim, H.-J.; Barboiu, B. Macromolecules 1997, 30, 8526. (b) Percec, V.; Barboiu, B.; Kim, H.-J. J. Am. Chem. Soc. 1998, 120, 305. For recent reviews on metal-catalyzed LRP initiated with alkyl halides see: (c) Matyjaszewski, K.; Xia, J. Chem. Rev. 2001, 101, 2921. (d) Kamigaito, M.; Ando, T.; Sawamoto, M. Chem. Rev. 2001, 101, 3689. (e) Fischer, H. Chem. Rev. 2001, 101, 3581.
17. For two representative publications that demonstrate the scope and capabilities of sulfonyl chloride initiators see: (a) Percec, V.; Kim, H.-J.; Barboiu, B. Macromolecules 1997, 30, 8526. (b) Percec, V.; Barboiu, B.; Kim, H.-J. J. Am. Chem. Soc. 1998, 120, 305. For recent reviews on metal-catalyzed LRP initiated with alkyl halides see: (c) Matyjaszewski, K.; Xia, J. Chem. Rev. 2001, 101, 2921. (d) Kamigaito, M.; Ando, T.; Sawamoto, M. Chem. Rev. 2001, 101, 3689. (e) Fischer, H. Chem. Rev. 2001, 101, 3581.
18. For two representative publications that demonstrate the scope and capabilities of sulfonyl chloride initiators see: (a) Percec, V.; Kim, H.-J.; Barboiu, B. Macromolecules 1997, 30, 8526. (b) Percec, V.; Barboiu, B.; Kim, H.-J. J. Am. Chem. Soc. 1998, 120, 305. For recent reviews on metal-catalyzed LRP initiated with alkyl halides see: (c) Matyjaszewski, K.; Xia, J. Chem. Rev. 2001, 101, 2921. (d) Kamigaito, M.; Ando, T.; Sawamoto, M. Chem. Rev. 2001, 101, 3689. (e) Fischer, H. Chem. Rev. 2001, 101, 3581.11
19. For two representative publications that demonstrate the scope and capabilities of sulfonyl chloride initiators see: (a) Percec, V.; Kim, H.-J.; Barboiu, B. Macromolecules 1997, 30, 8526. (b) Percec, V.; Barboiu, B.; Kim, H.-J. J. Am. Chem. Soc. 1998, 120, 305. For recent reviews on metal-catalyzed LRP initiated with alkyl halides see: (c) Matyjaszewski, K.; Xia, J. Chem. Rev. 2001, 101, 2921. (d) Kamigaito, M.; Ando, T.; Sawamoto, M. Chem. Rev. 2001, 101, 3689. (e) Fischer, H. Chem. Rev. 2001, 101, 3581.
20. For two representative publications that demonstrate the scope and capabilities of sulfonyl chloride initiators see: (a) Percec, V.; Kim, H.-J.; Barboiu, B. Macromolecules 1997, 30, 8526. (b) Percec, V.; Barboiu, B.; Kim, H.-J. J. Am. Chem. Soc. 1998, 120, 305. For recent reviews on metal-catalyzed LRP initiated with alkyl halides see: (c) Matyjaszewski, K.; Xia, J. Chem. Rev. 2001, 101, 2921. (d) Kamigaito, M.; Ando, T.; Sawamoto, M. Chem. Rev. 2001, 101, 3689. (e) Fischer, H. Chem. Rev. 2001, 101, 3581.
21. Percec, V.; Bera, T. K.; De, B. B.; Sanai, Y.; Smith, J.; Holerca, M. N.; Barboiu, B.; Grubbs, R. B.; Fréchet, J. M. J. J. Org. Chem. 2001, 66, 2104.
22. (a) Kamigata, N.; Udodaira, K.; Shimizu, T. J. Chem. Soc., Perkin Trans. 1 1997, 783.
23. (b) Ando, T.; Kamigaito, M.; Sawamoto, M. Macromolecules 1998, 31, 6708.
24. (c) Bon, S. A. F.; Steward, A. G.; Haddleton, D. M. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 2678.
25. (d) Tokuchi, K.; Ando, T.; Kamigaito, M.; Sawamoto, M. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 4735.
26. (e) Snijder, A.; Klumperman, B.; van der Linde, R. J. Polym. Sci., Part A: Polym. Chem. 2002, 40, 2350.
27. (a) Mander, L. N.; Sethi, S. P. Tetrahedron Lett. 1984, 25, 5953.
28. (b) Corey, E. J.; Cho, H.; Rucker, C.; Hua, D. H. Tetrahedron Lett. 1981, 22, 3455.
29. (a) Percec, V.; Barboiu, B.; van der Sluis, M. Macromolecules 1998, 31, 4053.
30. (b) van der Sluis, M.; Barboiu, B.; Pesa, N.; Percec, V. Macromolecules 1998, 31, 9409.
31. (a) Percec, V.; Barboiu, B.; Bera, T. K.; van der Sluis, M.; Grubbs, R. B.; Fréchet, J. M. J. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 4776.
32. (b) Robello, D. R.; Andre, A.; McCovick, T. A.; Kraus, A.; Mourey, T. H. Macromolecules 2002, 35, 9334.
33. (a) Fréchet, J. M. J.; Tomalia, D. A. Dendrimers and Dendritic Polymers, Wiley: New York, 2001.
34. (b) Newkome, G. R.; Moorefield, C. N.; Vögtle, F. Dendrimers and Dendrons; Wiley-VCH: Weinheim, Germany, 2001.
35. (c) Tomalia, D. A.; Fréchet, J. M. J. J. Polym. Sci., Part A: Polym. Chem. 2002, 40, 2719.
36. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
37. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
38. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
39. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
40. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
41. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
42. For some representative and pioneering examples of divergent strategies to dendrimers see: (a) Buhleier, E.; Wehner, W. I.; Vögtle, F. Synthesis 1978, 155. (b) Tomalia, D. A.; Baker, H.; Dewald, J.; Hall, M.; Kallos, G.; Martin, S.; Roeck, J.; Ryder, J.; Smith, P. Polym. J. 1985, 17, 117. (c) Newkome, G. R.; Yao, Z.; Baker, R. G.; Gupta, V. K. J. Org. Chem. 1985, 50, 2003. (d) de Brabander-van den Berg, E.-M. M.; Meijer, E. W. Angew. Chem., Int. Ed. Engl. 1993, 32, 1308. (e) Wörner, C.; Mülhaupt, R. Angew. Chem., Int. Ed. Engl. 1993, 32, 1306. (f) Ihre, H.; De Jesus, L. P.; Fréchet, J. M. J.; J. Am. Chem. Soc. 2001, 123, 5908. (g) Peerlings, H. W. I.; van Benthem, R. A. T. M.; Meijer, E. W. J. Polym. Sci., Part A: Polym. Chem. 2001, 39, 3112.
43. For recent reviews on hyperbranched polymers see: (a) Kim, Y. H. J. Polym. Sci., Part A: Polym. Chem. 1998, 36, 1685. (b) Voit, B. I. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 2505. (c) Sunder, A.; Heinemann, J.; Frey, H. Chem. Eur. J. 2000, 6, 2499. (d) Kubisa, P. J. Polym. Sci., Part A: Polym. Chem. 2003, 41, 457.
44. For recent reviews on hyperbranched polymers see: (a) Kim, Y. H. J. Polym. Sci., Part A: Polym. Chem. 1998, 36, 1685. (b) Voit, B. I. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 2505. (c) Sunder, A.; Heinemann, J.; Frey, H. Chem. Eur. J. 2000, 6, 2499. (d) Kubisa, P. J. Polym. Sci., Part A: Polym. Chem. 2003, 41, 457.
45. For recent reviews on hyperbranched polymers see: (a) Kim, Y. H. J. Polym. Sci., Part A: Polym. Chem. 1998, 36, 1685. (b) Voit, B. I. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 2505. (c) Sunder, A.; Heinemann, J.; Frey, H. Chem. Eur. J. 2000, 6, 2499. (d) Kubisa, P. J. Polym. Sci., Part A: Polym. Chem. 2003, 41, 457.
46. For recent reviews on hyperbranched polymers see: (a) Kim, Y. H. J. Polym. Sci., Part A: Polym. Chem. 1998, 36, 1685. (b) Voit, B. I. J. Polym. Sci., Part A: Polym. Chem. 2000, 38, 2505. (c) Sunder, A.; Heinemann, J.; Frey, H. Chem. Eur. J. 2000, 6, 2499. (d) Kubisa, P. J. Polym. Sci., Part A: Polym. Chem. 2003, 41, 457.
47. For recent conceptual advances in hyperbranched polymers see: (a) Emrick, T.; Chang, H.-T.; Fréchet, J. M. J. Macromolecules 1999, 32, 6380. (b) Guan, Z.; Cotts, P. M.; McCord, E. F.; McLain, S. J. Science 1999, 283, 2059. (c) Markowski, L. J.; Thompson, J. L.; Moore, J. S. Macromolecules 2002, 35, 1599. (d) Guan, Z. J. Am. Chem. Soc. 2002, 124, 5616.
48. For recent conceptual advances in hyperbranched polymers see: (a) Emrick, T.; Chang, H.-T.; Fréchet, J. M. J. Macromolecules 1999, 32, 6380. (b) Guan, Z.; Cotts, P. M.; McCord, E. F.; McLain, S. J. Science 1999, 283, 2059. (c) Markowski, L. J.; Thompson, J. L.; Moore, J. S. Macromolecules 2002, 35, 1599. (d) Guan, Z. J. Am. Chem. Soc. 2002, 124, 5616.
49. For recent conceptual advances in hyperbranched polymers see: (a) Emrick, T.; Chang, H.-T.; Fréchet, J. M. J. Macromolecules 1999, 32, 6380. (b) Guan, Z.; Cotts, P. M.; McCord, E. F.; McLain, S. J. Science 1999, 283, 2059. (c) Markowski, L. J.; Thompson, J. L.; Moore, J. S. Macromolecules 2002, 35, 1599. (d) Guan, Z. J. Am. Chem. Soc. 2002, 124, 5616.
50. For recent conceptual advances in hyperbranched polymers see: (a) Emrick, T.; Chang, H.-T.; Fréchet, J. M. J. Macromolecules 1999, 32, 6380. (b) Guan, Z.; Cotts, P. M.; McCord, E. F.; McLain, S. J. Science 1999, 283, 2059. (c) Markowski, L. J.; Thompson, J. L.; Moore, J. S. Macromolecules 2002, 35, 1599. (d) Guan, Z. J. Am. Chem. Soc. 2002, 124, 5616.
51. (a) Mourey, T. H.; Turner, S. R.; Rubinstein, M.; Fréchet, J. M. J.; Hawker, C. J.; Wooley, K. L. Macromolecules 1992, 25, 2401.
52. (b) Hawker, C. J.; Malmström, E. E.; Frank, K. W.; Kampf, J. P. J. Am. Chem. Soc. 1997, 119, 9903.
53. (c) Naylor, A. M.; Goddard, W. A., III; Kiefer, G. E.; Tomalia, D. A. J. Am. Chem. Soc. 1989, 111, 2339.
54. (d) Percec, V.; Cho, W.-D.; Mosier, P. E.; Ungar, G.; Yeardley, D. J. P. J. Am. Chem. Soc. 1998, 120, 11061.
55. Anton, G. R. M.; Horta, A.; Fuentes, H. I. Polym. Commun. 1986, 27, 5.
56. (a) Percec, V.; Ahn, C.-H.; Cho, W.-D.; Jamieson, A. M.; Kim, J.; Leman, T.; Schmidt, M.; Gerle, M.; Möller, M.; Prokhorova, S. A.; Sheiko, S. S.; Cheng, S. Z. D.; Zhang, A.; Ungar, G.; Yeardley, D. J. P. J. Am. Chem. Soc. 1998, 120, 8619.
57. (b) Wyatt, P. J. Anal. Chim. Acta 1993, 272, 1.
58. Motherwell, W. B.; Crich, D. Free Radical Reactions in Organic Synthesis; Academic Press: New York, 1992.
59. (a) Webster, O. W. Science 1991, 251, 887.
60. (b) Hawker, C. J.; Bosman, A. W.; Harth, E. Chem. Rev. 2001, 101, 3661.
61. (a) Trollsas, M.; Hedrick, J. L. J. Am. Chem. Soc. 1998, 120, 4644.
62. (b) Hedrick, J. L.; Magbitang, T.; Connor, E. F.; Glauser, T.; Volksen, W.; Hawker, C. J.; Lee, V. Y.; Miller, R. D. Chem. Eur. J. 2002, 8, 3308.
63. Percec, V. Invited Lecture Presented at the IUPAC International Symposium on Ionic Polymerizations, Kyoto, Japan, July 19-23, 1999; Book of Abstracts, p 37; IUPAC: Kyoto, 1999.
64. Barboiu, B.; Percec, V. Macromolecules 2001, 34, 8626.
65. Linnemayr, K.; Vana, P.; Allmaier, G. Rapid Commun. Mass. Spectrom. 1998, 12, 1344.