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Volumn 53, Issue 45, 1997, Pages 15367-15396

Bimetallic samarium(III) catalysts via electron transfer initiation: The facile synthesis of well-defined (meth)acrylate triblock copolymers

Author keywords

[No Author keywords available]

Indexed keywords

METHACRYLIC ACID; SAMARIUM;

EID: 0030664812     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(97)00968-X     Document Type: Article
Times cited : (41)

References (108)
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    • and references therein
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    • note
    • 2H was only accomplished "after expending many efforts.".
  • 47
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    • note
    • 2+) is -1.15 V. Reference 25.
  • 49
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    • Sm(II) species are typically purple, blue, or green, while Sm(III) species are usually yellow or orange. See: Evans, W. J. Polyhedron 1987, 6, 803-835.
    • (1987) Polyhedron , vol.6 , pp. 803-835
    • Evans, W.J.1
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    • note
    • 2. Zheng, S., Cornell University, personal communication, 1996.
  • 55
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    • note
    • We are aware of two other monomers for which samarocene cyclopolymerization has been investigated. Sogah and Zeng found 2,2'-bis((methacryloyloxy)methyl)-1,1'-binaphthyl to undergo polymerization with 2, although incomplete cyclization was achieved. A second dimethacrylate, (-)-trans-2,3-bis-((methacryloyloxy)diphenylmethyl)-1,4-dioxaspiro[4.4]-nonane, was not polymerized. In this case inactivity can be ascribed to the steric hindrance of the ester, which is even greater than that of the trityl group. Zheng, S., Cornell University, personal communication, 1996.
  • 64
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    • Immergut, E., Eds.; Wiley: New York
    • g of atactic PMMA is 105 °C, while that of the 100% syndiotactic polymer is predicted to be 131 °C. See: (a) Polymer Handbook; 3rd ed.; Brandrup, J.; Immergut, E., Eds.; Wiley: New York, 1989, pp III-144-149.
    • (1989) Polymer Handbook; 3rd Ed.
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    • Reference 9
    • (b) Reference 9.
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    • note
    • 2SmMe(THF): 20:47:33; 25:51:24; 8:72:20; 6:91:3. See Reference 14.
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    • note
    • Benzyl methacrylate, like hexyl methacrylate, is too high-boiling for convenient vacuum transfer.
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    • note
    • n (obs) slightly above 10 810, PDI ∼ 1.10.
  • 75
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    • note
    • Since this technique provides separate molecular weight information for each fraction of polymer as it elutes, while GPC alone gives the average molecular weight for an entire sample, GPC / LS can more easily detect small amounts of lower molecular weight contaminants at the tail end of the molecular weight distribution.
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    • Chemical Reactions on Polymers; Benham, J. L., Kinstle, J., Eds.; American Chemical Society: Washington, DC
    • For polymers with a high percentage of cleavable groups, McGrath has noted that a mixed solvent system (toluene / methanol) is required to maintain solubility. When II was reacted under these conditions, a portion of the deprotected PtBA units were converted into poly(methyl acrylate). Thus, we employed straight toluene as a solvent. A small amount of polymer precipitation was seen, but conversion to PAA was still quantitative. See: (a) Long, T. E.; Allen, R. D.; McGrath, J. E. In Chemical Reactions on Polymers; Benham, J. L., Kinstle, J., Eds.; ACS Symposium Series 364; American Chemical Society: Washington, DC, 1988, pp 258-275.
    • (1988) ACS Symposium Series 364 , pp. 258-275
    • Long, T.E.1    Allen, R.D.2    McGrath, J.E.3
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    • (b) Reference 80.
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    • note
    • 1H NMR spectrum of IV prepared by acid hydrolysis, which was carried out under nitrogen purge to remove the isobutylene, contained only a very small impurity resonance in this area, and no such peak was seen in the spectrum of V prepared with TMSI. See Reference 85.
  • 92
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    • note
    • n = 29 030, PDI = 1.09. Analysis of IV was unsuccessful due to isorefractivity with the mobile phase.
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    • Authentic sample as reported in JEOL High Resolution NMR Spectra; Sadtler Research Laboratories: Philadelphia, 1967.
    • (1967) JEOL High Resolution NMR Spectra
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    • Pouchert, C. J., Ed.; Aldrich Chemical Company: Milwaukee
    • Authentic sample as reported in The Aldrich Library of FT-IR Spectra, 1st ed.; Pouchert, C. J., Ed.; Aldrich Chemical Company: Milwaukee, 1985; Vol. 2.
    • (1985) The Aldrich Library of FT-IR Spectra, 1st Ed. , vol.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.