The Experts below are selected from a list of 1059 Experts worldwide ranked by ideXlab platform
Patrick Lacroixdesmazes - One of the best experts on this subject based on the ideXlab platform.
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dispersion polymerization of 2 hydroxyethyl methacrylate stabilized by a hydrophilic co2 philic poly ethylene oxide b poly 1 1 2 2 tetrahydroperfluorodecyl acrylate peo b pfda diblock copolymer in supercritical carbon dioxide
Polymer, 2004Co-Authors: Patrick LacroixdesmazesAbstract:Abstract Dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) has been successfully performed in supercritical carbon dioxide at P=370 bar and T=65 °C with azobis(Isobutyronitrile) as initiator and a hydrophilic/CO2-philic poly(ethylene oxide)-b-poly(1,1,2,2-tetrahydroperfluorodecyl acrylate) (PEO-b-PFDA) block copolymer as steric stabilizer. The PEO-b-PFDA (2K/21K) block copolymer was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. Spherical particles of poly(HEMA) were obtained in the range of 200–400 nm diameter size with a narrow particle size distribution (Dw/Dn
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dispersion polymerization of 2 hydroxyethyl methacrylate stabilized by a hydrophilic co2 philic poly ethylene oxide b poly 1 1 2 2 tetrahydroperfluorodecyl acrylate peo b pfda diblock copolymer in supercritical carbon dioxide
Polymer, 2004Co-Authors: Patrick LacroixdesmazesAbstract:Abstract Dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) has been successfully performed in supercritical carbon dioxide at P =370 bar and T =65 °C with azobis(Isobutyronitrile) as initiator and a hydrophilic/CO 2 -philic poly(ethylene oxide)- b -poly(1,1,2,2-tetrahydroperfluorodecyl acrylate) (PEO- b -PFDA) block copolymer as steric stabilizer. The PEO- b -PFDA (2K/21K) block copolymer was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. Spherical particles of poly(HEMA) were obtained in the range of 200–400 nm diameter size with a narrow particle size distribution ( D w / D n b -PFDA (3.5 w/w% versus HEMA).
Michael P Shaver - One of the best experts on this subject based on the ideXlab platform.
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single component iron catalysts for atom transfer and organometallic mediated radical polymerizations mechanistic studies and reaction scope
Macromolecules, 2014Co-Authors: Laura E N Allan, Jarret P Macdonald, Gary S Nichol, Michael P ShaverAbstract:Tetradentate amine–bis(phenolate)iron(III) halide complexes containing chloro substituents on the aromatic ring are extremely efficient catalysts for controlled radical polymerization. Molecular weights are in good agreement with theoretical values, and dispersities are as low as 1.07 for substituted styrenes and methyl methacrylate polymerizations. Kinetic data reveal activity for styrene polymerization among the fastest reported to date, with the excellent control shown to be electronic rather than steric in origin. Mechanistic studies implicate a multimechanism system with cooperation between atom transfer radical polymerization (ATRP) and organometallic mediated radical polymerization (OMRP). The in situ reduction of the Fe(III) complex with ascorbic acid or tin octanoate allows polymerizations to be initiated by both 1-phenylethyl chloride (1-PECl, ATRP regime) and azobis(Isobutyronitrile) (AIBN, OMRP regime) to isolate the mechanism of control and offer unique initiation pathways.
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Single Component Iron Catalysts for Atom Transfer and Organometallic Mediated Radical Polymerizations: Mechanistic Studies and Reaction Scope
2014Co-Authors: Laura E. N. Allan, Jarret P Macdonald, Gary S Nichol, Michael P ShaverAbstract:Tetradentate amine–bis(phenolate)iron(III) halide complexes containing chloro substituents on the aromatic ring are extremely efficient catalysts for controlled radical polymerization. Molecular weights are in good agreement with theoretical values, and dispersities are as low as 1.07 for substituted styrenes and methyl methacrylate polymerizations. Kinetic data reveal activity for styrene polymerization among the fastest reported to date, with the excellent control shown to be electronic rather than steric in origin. Mechanistic studies implicate a multimechanism system with cooperation between atom transfer radical polymerization (ATRP) and organometallic mediated radical polymerization (OMRP). The in situ reduction of the Fe(III) complex with ascorbic acid or tin octanoate allows polymerizations to be initiated by both 1-phenylethyl chloride (1-PECl, ATRP regime) and azobis(Isobutyronitrile) (AIBN, OMRP regime) to isolate the mechanism of control and offer unique initiation pathways
Clay S. Bennett - One of the best experts on this subject based on the ideXlab platform.
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aryl trifluoroethyl iodonium triflimide and nitrile solvent systems a combination for the stereoselective synthesis of armed 1 2 trans β glycosides at noncryogenic temperatures
Organic Letters, 2015Co-Authors: Andrei Minciunescu, Clay S. BennettAbstract:Armed thioglycosides can be activated with aryl(trifluoroethyl)iodonium triflimide in 2:1 CH2Cl2/pivalonitrile or a solvent combination of CH2Cl2, acetonitrile, Isobutyronitrile, and pivalonitrile (6:1:1:1) at 0 °C for glycosylation reactions that proceed in good yield and moderate to excellent selectivity (up to 25:1 β/α). Comparison to other common glycosylation promoters reveals that both the mixed solvent and the iodonium salt promoter are required for stereoselectivity.
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Aryl(trifluoroethyl)iodonium Triflimide and Nitrile Solvent Systems: A Combination for the Stereoselective Synthesis of Armed 1,2-trans-β-Glycosides at Noncryogenic Temperatures
2015Co-Authors: An-hsiang Adam Chu, Andrei Minciunescu, Clay S. BennettAbstract:Armed thioglycosides can be activated with aryl(trifluoroethyl)iodonium triflimide in 2:1 CH2Cl2/pivalonitrile or a solvent combination of CH2Cl2, acetonitrile, Isobutyronitrile, and pivalonitrile (6:1:1:1) at 0 °C for glycosylation reactions that proceed in good yield and moderate to excellent selectivity (up to 25:1 β/α). Comparison to other common glycosylation promoters reveals that both the mixed solvent and the iodonium salt promoter are required for stereoselectivity
Shi-chen Zhao - One of the best experts on this subject based on the ideXlab platform.
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metal free aerobic oxidative cyanation of tertiary amines azobis Isobutyronitrile aibn as a sole cyanide source
Journal of Organic Chemistry, 2017Co-Authors: Peng-yu Liu, Chao Zhang, Shi-chen ZhaoAbstract:An aerobic oxidative cyanation for the synthesis of α-aminonitriles was reported. The formation of C(sp3)-CN bonds was achieved under a metal-free condition by utilizing azobis(Isobutyronitrile) as a sole organic cyanide source with the combination of pivalic acid and sodium acetate as additives.
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Metal-Free Aerobic Oxidative Cyanation of Tertiary Amines: Azobis(Isobutyronitrile) (AIBN) as a Sole Cyanide Source
2017Co-Authors: Peng-yu Liu, Chao Zhang, Shi-chen ZhaoAbstract:An aerobic oxidative cyanation for the synthesis of α-aminonitriles was reported. The formation of C(sp3)-CN bonds was achieved under a metal-free condition by utilizing azobis(Isobutyronitrile) as a sole organic cyanide source with the combination of pivalic acid and sodium acetate as additives
Laura E N Allan - One of the best experts on this subject based on the ideXlab platform.
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single component iron catalysts for atom transfer and organometallic mediated radical polymerizations mechanistic studies and reaction scope
Macromolecules, 2014Co-Authors: Laura E N Allan, Jarret P Macdonald, Gary S Nichol, Michael P ShaverAbstract:Tetradentate amine–bis(phenolate)iron(III) halide complexes containing chloro substituents on the aromatic ring are extremely efficient catalysts for controlled radical polymerization. Molecular weights are in good agreement with theoretical values, and dispersities are as low as 1.07 for substituted styrenes and methyl methacrylate polymerizations. Kinetic data reveal activity for styrene polymerization among the fastest reported to date, with the excellent control shown to be electronic rather than steric in origin. Mechanistic studies implicate a multimechanism system with cooperation between atom transfer radical polymerization (ATRP) and organometallic mediated radical polymerization (OMRP). The in situ reduction of the Fe(III) complex with ascorbic acid or tin octanoate allows polymerizations to be initiated by both 1-phenylethyl chloride (1-PECl, ATRP regime) and azobis(Isobutyronitrile) (AIBN, OMRP regime) to isolate the mechanism of control and offer unique initiation pathways.
