Nano‐to‐Macroscale Poly(methyl methacrylate) Stereocomplex Assemblies

Goh, Tor Kit; Tan, Jing; Guntari, Stefanie N.; Satoh, Kotaro; Blencowe, Anton; Kamigaito, Masami; Qiao, Greg G.

doi:10.1002/ange.200903932

Cited by 9 publications

(14 citation statements)

References 41 publications

(22 reference statements)

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“…[8,12] We identified here an opportunity to make use of a decomposition product as an active catalyst in a worthwhile transformation.…”

mentioning

confidence: 98%

“…Methanolysis decomposition products of the first-and second-generation olefin metathesis precatalysts 1 and 2, respectively. (12) centers. The 1 H NMR spectrum does not, however, indicate the formation of a hydride species.…”

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confidence: 98%

“…Methanolysis decomposition products of the first-and second-generation olefin metathesis precatalysts 1 and 2, respectively. (12), Ru1-Cl2 2.3741(12), Ru1-P1 2.3851(12), Ru1-P2 2.4021(12); P1-Ru1-P2 170.99(4), Cl1-Ru1-Cl2 156.51(4), C1-Ru1-P1 91.15 (12), C1-Ru1 P2 97.86 (12) centers. The 1 H NMR spectrum does not, however, indicate the formation of a hydride species.…”

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confidence: 99%

“…Complex 3, as expected, is not metathesis active, but the ruthenium complexes are catalytically active in numerous catalytic transformations: alcohol racemization, [9] rearrangement of propargylic alcohols, [10] cyclization, [11] and polymerization, to name a few. [8,12] We identified here an opportunity to make use of a decomposition product as an active catalyst in a worthwhile transformation.…”

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confidence: 99%

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From Olefin Metathesis Catalyst to Alcohol Racemization Catalyst in One Step

et al. 2011

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Aquest mateix article està publicat a l'edició alemanya d''Angewandte Chemie' (ISSN 0044-8249, EISSN 1521-3757), 2012, vol.124, núm. 4, p. 1066–1069. DOI http://dx.doi.org/10.1002/ange.201106915From olefin metathesis catalyst to alcohol racemization catalyst in one stepThe research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. CP-FP 211468-2 EUMET. S.P.N. is a Royal Society Wolfson Research Merit Award holder. L.C. thanks BSC (QCM-2010-2-0020), and the HPC team of Enea for the use of the ENEA-GRID and the HPC facilities, and CRESCO, in Portici (Italy) for access to remarkable computational resources. A.P. thanks the Spanish MICINN for a Ramon y Cajal contract (RYC-2009-04170) and the European Commission for a Career Integration Grant (CIG09-GA-2011-293900

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“…[8,12] We identified here an opportunity to make use of a decomposition product as an active catalyst in a worthwhile transformation.…”

mentioning

confidence: 98%

mentioning

confidence: 98%

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confidence: 99%

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confidence: 99%

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From Olefin Metathesis Catalyst to Alcohol Racemization Catalyst in One Step

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“…123 The syndiospecific living radical polymerization of MMA was first carried out with Ru(Cp*)Cl(PPh 3 ) 2 in PhC(CF 3 ) 2 OH to give the syndiotactic-rich PMMA with the dormant C-Cl terminals. The isolated linear PMMA chain was then linked together by Ru(Ind)Cl(PPh 3 ) 2 in the presence of ethylene glycol dimethacrylate to result in star polymers with syndiotactic PMMA arms in a high yield 495%.…”

Section: Stereospecific Living Radical Polymerizationmentioning

confidence: 99%

Recent developments in metal-catalyzed living radical polymerization

Kamigaito

2010

Polym J

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This review presents a short overview of recent developments in metal-catalyzed living radical polymerization, mainly focusing on our recent research studies related to the subject. Metal-catalyzed living radical polymerization or atom transfer radical polymerization, which was originally developed via evolution of the metal-catalyzed Kharasch or atom transfer radical addition to chain-growth polymerization via reversible activation, has now been widely developed in many aspects. The effective metal catalysts include various transition metals, such as ruthenium, copper, iron and nickel, and highly active and versatile catalytic systems have been developed by designing ligands, applying lower oxidation metal species and using additives to widen the scope of controllable monomers and to minimize the amount of metal catalysts and the residual metals in the products. The development of the initiating systems has enabled the synthesis of a wide variety of novel, well-defined polymers, including end-functionalized, block, graft and star polymers, but also more complicated polymers possessing multiple controlled structures. Furthermore, metal-catalyzed living radical polymerization has been judiciously combined with stereospecific radical polymerization based on the use of polar solvents or Lewis acid additives, resulting in the dual control of the molecular weight and the tacticity of the resulting polymers and enabling the preparation of stereoblock and stereogradient polymers. Keywords: block polymer; living radical polymerization; precision polymer synthesis; transition metal catalyst; star polymer; stereospecific polymerization INTRODUCTIONSince the discovery of metal-catalyzed living radical polymerization or atom transfer radical polymerization (ATRP), there have been many developments in this research area, including active and versatile metal catalytic systems; the scope of controllable monomers; well-defined polymers with various controlled architectures; hybridization of the controlled polymers with inorganic, metal and biomolecular compounds; and attempts or real applications to a variety of industrial materials. 1-17 Besides these metal catalytic systems, there have also been substantial developments in various living radical polymerizations, such as nitroxide-mediated polymerizations, reversible addition fragmentation chain-transfer polymerizations and others, and in all of these, there are characteristic features of the mechanisms and components. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] The metal-catalyzed living radical polymerization was originally discovered via evolution of the metal-catalyzed Kharasch or atom transfer radical addition reaction 35 to the chain-growth polymerization of vinyl monomers (Figure 1). 1 The initiating system generally consists of a transition metal complex in a lower oxidation state and an organic halide, in which the carbon-halogen bond of the halogen compound is activated by the metal catalyst to generate the carbon radical species upon a one-e...

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