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Volumn 42, Issue 22, 2009, Pages 8611-8614

Palladium complexes with aqueous-partitioning dibenzylideneacetone ligands. A new strategy for catalyst design in suzuki polycondensation reactions

Author keywords

[No Author keywords available]

Indexed keywords

AQUEOUS PHASE; CATALYST DESIGNS; CATALYST SYSTEM; CONDENSATION POLYMERIZATION; DIBENZYLIDENEACETONE; NEW DIRECTIONS; NEW STRATEGY; ORGANIC PHASE; PALLADIUM COMPLEXES; POLYFLUORENES; SUZUKI POLYCONDENSATION;

EID: 71549153506     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma901793g     Document Type: Article
Times cited : (6)

References (43)
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    • However, this is an exception rather than the norm
    • High molecular weights can be achieved with Suzuki polycondensations under traditional conditions. For a recent example, see: Fu, Y.; Sun, M.; Wu, Y.; Bo, Z.; Ma, D. J. Polym. Sci., Polym. Chem. Ed. 2008, 46, 1349-1356. However, this is an exception rather than the norm.
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  • 22
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    • Suzuki polycondensations can be used to synthesize hyperbranched polymers with very high molecular weights. For example, see: Sun, M.; Li, J.; Li, B.; Fu, Y.; Bo, Z. Macromolecules 2005, 38, 2651-2658.
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  • 23
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    • As pointed out by a reviewer, insufficient molecular weights can also be caused by inadequate monomer purity and stoichiometric match. Nevertheless, problems with the traditional triphenylphosphine catalyst systems are well documented. For example, see
    • As pointed out by a reviewer, insufficient molecular weights can also be caused by inadequate monomer purity and stoichiometric match. Nevertheless, problems with the traditional triphenylphosphine catalyst systems are well documented. For example, see: Goodson, F. E.; Wallow, T. I.; Novak, B. M. Macromolecules 1998, 31, 2047-2056.
    • (1998) Macromolecules , vol.31 , pp. 2047-2056
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    • A patent application on this subject was recently filed with the USPTO
    • A patent application on this subject was recently filed with the USPTO.
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    • Polymerization attempts utilizing 7 without the presence of phosphine were not successful, in line with observations made when 3 was used without phosphine in small molecule examples run under similar conditions
    • Polymerization attempts utilizing 7 without the presence of phosphine were not successful, in line with observations made when 3 was used without phosphine in small molecule examples run under similar conditions: Goodson, F. E.; Wallow, T. I.; Novak, B. M. Org. Synth. 1998, 75, 61-68.
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    • w = 125000 g/mol, average of two trials) that were similar to those obtained from a commercial sample (entry 3)
    • w = 125000 g/mol, average of two trials) that were similar to those obtained from a commercial sample (entry 3).
  • 36
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    • As was the case with our previous polymerizations (ref 24), the chromatograms exhibit bimodality with the high molecular shoulder gaining in prominence (and becoming the main peak for the higest molecular weight examples) with increased gellation during the polymerization. This may be due to a Trommsdorff-like effect in which increased viscoscity affects a molecular-weight limiting side reaction more than the polymerization. While differences in bimodal shape may be caused by differences in workup (for example)
    • As was the case with our previous polymerizations (ref 24), the chromatograms exhibit bimodality with the high molecular shoulder gaining in prominence (and becoming the main peak for the higest molecular weight examples) with increased gellation during the polymerization. This may be due to a Trommsdorff-like effect in which increased viscoscity affects a molecular-weight limiting side reaction more than the polymerization. While differences in bimodal shape may be caused by differences in workup (for example)
  • 37
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    • We do not believe that to be the case here, since polymers were analyzed after minimal workup, which was the same in all cases
    • see: Yamamoto, T.; Abla, M.; Murakami, Y. Bull. Chem. Soc. Jpn. 2002, 75, 1997-2009) we do not believe that to be the case here, since polymers were analyzed after minimal workup, which was the same in all cases.
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    • Yamamoto, T.1    Abla, M.2    Murakami, Y.3
  • 38
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    • note
    • n value determined by GPC-LS is likely inflated. It is worth noting that most literature values for polyfluorene have been determined by GPC relative to polystyrene.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.