Journal ArticleDOI
Polyhomologation: The Living Polymerization of Ylides
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TLDR
The polymerization of dimethylsufoxonium methylide to produce linear polymethylene polymers is described, providing control over molecular weight and functionality at the polymer chain ends.Abstract:
The polymerization of dimethylsufoxonium methylide to produce linear polymethylene polymers is described. The reaction is catalyzed/initiated by trialkylboranes and gives organoboron star polymers as the primary product. The reaction is a living polymerization, providing control over molecular weight and functionality at the polymer chain ends. A variety of novel polymethylene architectures are available by this methodology.read more
Citations
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Journal ArticleDOI
Converting step-growth to chain-growth condensation polymerization
TL;DR: The development and applications of chain-growth condensation polymerization are reviewed in this paper, where substituent effect-assisted chain growth condensation is applied to the synthesis of polyamides and polyesters.
Journal ArticleDOI
C1 polymerisation and related C–C bond forming ‘carbene insertion’ reactions
TL;DR: A critical review of the current state-of-the-art in C1 polymerization can be found in this paper, where the authors discuss the most important differences between C1 and C2 polymerization techniques, highlighting the opportunities provided by C1 polymers to prepare new polymer structures.
Journal ArticleDOI
Polyhomologation. A Living C1 Polymerization
Jun Luo,Kenneth J. Shea +1 more
TL;DR: This research focused on polymerization reactions that employ nonolefin monomers, more specifically the polymerization of ylides and diazoalkanes, which can provide quantities of specialized materials for the study of structure-property relationships and can guide the production of polymers for new commercial applications.
Journal ArticleDOI
The boron-catalyzed polymerization of dimethylsulfoxonium methylide. A living polymethylene synthesis.
Brett B. Busch,Manuel M. Paz,Kenneth J. Shea,Chad L. Staiger,Jonathan M. Stoddard,James R. Walker,Xian-Zhi Zhou,Huide Zhu +7 more
TL;DR: Although oligomeric polymethylene has been the most frequent synthetic target of this method, polymeric star organoboranes with molecular weights of 1.5 million have been produced.
References
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Journal ArticleDOI
Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts
TL;DR: In contrast to heterogeneous Ziegler-Natta catalysts, homogeneous metallocene-based catalysts as discussed by the authors allow efficient control of regio-and stereoregularities, molecular weights and molecular weight distributions, and comonomer incorporation.
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The Dimensions of Chain Molecules Containing Branches and Rings
TL;DR: In this paper, the mean square radii of various branched and ringed polymer molecules were derived under the usual assumptions regarding the statistics of chain configuration, and it was shown that the number of branches or rings can be determined from light scattering measurements.
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Dimethyloxosulfonium Methylide ((CH3)2SOCH2) and Dimethylsulfonium Methylide ((CH3)2SCH2). Formation and Application to Organic Synthesis
E. J. Corey,Michael Chaykovsky +1 more
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The End of Cheap Oil
Colin Campbell,Jean Laherrere +1 more
TL;DR: The End of Cheap Oil In 1973 and 1979, a pair of sudden price increases rudely awakened the industrial world to its dependence on cheap crude oil as mentioned in this paper, sending the major economies sputtering into recession.
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Living Polymerization Methods
TL;DR: Living polymerization techniques can be used to achieve a high degree of control over polymer chain architecture, which results in polymers with widely diverse physical properties, even though they are made from readily available low-cost monomers.