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Volumn 44, Issue 13, 2011, Pages 5136-5145

Ligand-based steric effects in Ni-catalyzed chain-growth polymerizations using bis(dialkylphosphino)ethanes

Author keywords

[No Author keywords available]

Indexed keywords

CHAIN-GROWTH POLYMERIZATION; CONVENTIONAL CATALYST; INITIATION AND PROPAGATION; POLYMER CHARACTERIZATION; POLYMERIZATION CATALYSTS; RATE LIMITING; REDUCTIVE ELIMINATION; SIGNIFICANT IMPACTS; SPECTROSCOPIC STUDIES; STERIC EFFECT; STERIC PROPERTIES;

EID: 79960026131     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma200976f     Document Type: Article
Times cited : (69)

References (92)
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    • Yokozawa has postulated that the differences in π-donor abilities of the two monomers might account for the observed dependence of cross-propagation on the order of monomer addition. For reference, see ref 7c.
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    • To date, studies probing the influence of steric properties in the polymerization have focused largely on steric properties of monomers and the aryl-functionalized initiators. For recent examples, see
    • To date, studies probing the influence of steric properties in the polymerization have focused largely on steric properties of monomers and the aryl-functionalized initiators. For recent examples, see: Tkachov, R.; Senkovskyy, V.; Komber, H.; Kiriy, A. Macromolecules 2011, 44, 2006-2015
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    • Monomers 4a, 4b, 7, and 8 were prepared in situ via Grignard metathesis reaction with iPrMgCl. For leading references, see: Shi, L.; Chu, Y.; Knochel, P.; Mayr, H. Org. Lett. 2009, 11, 3502-3505
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    • 2. We were unable to trace these fluctuations to any specific variable (e.g., batch of catalyst or i-PrMgCl, student, etc).
    • 2. We were unable to trace these fluctuations to any specific variable (e.g., batch of catalyst or i-PrMgCl, student, etc).
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    • Lamps and Catala reported polymerization rate profiles with two distinct regions and suggested that the first region (∼10% conversion of monomer) corresponded to initiation and oligomer formation. For reference, see: Lamps, J.-P.; Catala, J.-M. Macromolecules 2009, 42, 7282-7284
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    • 2 which forms during initiation.
    • 2 which forms during initiation.
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    • depe is too slow for this pathway to be viable.
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    • 31P NMR spectroscopy experiments were performed at higher concentrations of nickel ([Ni] = 0.03 M) compared to the lab-scale polymerizations ([Ni] = 0.0015 M).
    • 31P NMR spectroscopy experiments were performed at higher concentrations of nickel ([Ni] = 0.03 M) compared to the lab-scale polymerizations ([Ni] = 0.0015 M).
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    • Though not understood at this time, the downfield resonances are substantially broadened at these elevated temperatures (see Supporting Information).
    • Though not understood at this time, the downfield resonances are substantially broadened at these elevated temperatures (see Supporting Information).
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    • The generalized equivalent cone angles for dppe (177°) and depe (175°) are similar. See ref 20.
    • The generalized equivalent cone angles for dppe (177°) and depe (175°) are similar. See ref 20.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.