Journal ArticleDOI
Catalytic Chain Transfer (co-)Polymerization: Unprecedented Polyisoprene CCG and a New Concept to Tune the Composition of a Statistical Copolymer.
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TLDR
Chain transfer in the course of a metal catalyzed statisticalCopolymerization may be viewed as a new and original way for the control of the composition of a copolymer.Abstract:
Borohydrido-halflanthanidocene/dialkylmagnesium combinations are found to be powerful catalytic systems for the chain transfer polymerization of isoprene and its copolymerization with styrene. A behavior close to a lanthanide catalyzed polyisoprene chain growth on magnesium is reported. Transmetalation is further shown to occur in the course of the statistical copolymerization of isoprene and styrene. For the same monomer feed, the amount of styrene inserted in the copolymer can be increased by a factor 3 using 10 equiv. dialkylmagnesium versus 1 in the range of our experimental conditions. Chain transfer in the course of a metal catalyzed statistical copolymerization may thus be viewed as a new and original way for the control of the composition of a copolymer.read more
Citations
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Journal ArticleDOI
Coordinative chain transfer polymerization.
Book ChapterDOI
Polymerization of 1,3-Conjugated Dienes with Rare-Earth Metal Precursors
TL;DR: In this paper, a survey of the publications related to cis-1,4-, trans-1/4-, 1/4, 3/4-regio-, and stereoselective polymerization of 1/3-conjugated dienes with rare-earth metal-based catalytic systems is presented.
Journal ArticleDOI
Chain‐Shuttling Polymerization at Two Different Scandium Sites: Regio‐ and Stereospecific “One‐Pot” Block Copolymerization of Styrene, Isoprene, and Butadiene
TL;DR: The first example of chain-shuttling copolymerization of styrene, isoprene, and butadiene by two different scandium catalysts is reported, achieving for the first time block copolymers with perfect syndiotactic polystyrene (sPS) and highly regulated cis-1,4-polyisoprene (PIP) blocks.
Journal ArticleDOI
Living catalyzed-chain-growth polymerization and block copolymerization of isoprene by rare-earth metal allyl precursors bearing a constrained-geometry-conformation ligand
TL;DR: Aminophenyl functionalized cyclopentadienyl ligated rare-earth metal allyl mediated cationic systems display high cis-1,4 selectivity for the polymerization of isoprene, and living reversible and rapid chain transfer to aluminium additives.
Journal ArticleDOI
Borohydride complexes of rare earths, and their applications in various organic transformations
Marc Visseaux,Fanny Bonnet +1 more
TL;DR: Borohydride complexes of the rare earths have attracted increasing interest during the last decade as mentioned in this paper, with a special emphasis on their use for polymerization catalysis, and a review of recent results over this period with respect to the preparation, characterization, structure, and applications in organic chemistry of this family of compounds, including inorganic and organometallic complexes.
References
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Book ChapterDOI
Neodymium-Based Ziegler/Natta Catalysts and their Application in Diene Polymerization
TL;DR: In this paper, a review of the polymerization of dienes by neodymium-based Ziegler/Natta-catalyst systems is presented, focusing on the monomer 1,3-butadiene (BD).
Journal ArticleDOI
Versatile Pathways for In Situ Polyolefin Functionalization with Heteroatoms: Catalytic Chain Transfer
Smruti B. Amin,Tobin J. Marks +1 more
TL;DR: Chain-transfer processes represent highly effective chemical means to achieve selective, in situ d- and f-block-metal catalyzed functionalization of polyolefins, with distinctly different mechanisms operative for the electron-poor and electron-rich reagents.
Journal ArticleDOI
Synthesis of New Dialkylmagnesium Compounds by Living Transfer Ethylene Oligo- and Polymerization with Lanthanocene Catalysts†
Journal ArticleDOI
Highly trans-stereospecific Isoprene Polymerization by Neodymium Borohydrido Catalysts
TL;DR: In this paper, a borohydridoneodymium (BH4)3(THF)3 (1) and dialkylmagnesium (Cp*nPr) catalysts were used for polyisoprene polymerization.
Journal ArticleDOI
Lanthanide Borohydrides as Precursors to Organometallic Compounds. Mono(cyclooctatetraenyl) Neodymium Complexes
TL;DR: In this paper, the X-ray crystal structures of 7 and of a toluene solvate of 9 have been determined by treating 4 or 5 with the alkali metal salt of the corresponding anionic reagent.