Yttrium chelating diamide complexes in olefin and polar monomer polymerisation

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StatementBenjamin Robert Elvidge.
SeriesSussex theses ; S 5735
The Physical Object
Paginationix, 260 leaves :
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Open LibraryOL16174739M

Yttrium chelating diamide complexes in olefin and polar monomer polymerisation Author: Elvidge, Benjamin Robert ISNI: X Awarding Body: University of Sussex Current Institution: University of Sussex Date of Award: Availability of Full Text.

Novel yttrium chelating diamide complexes [(Y{ArN(CH2)xNAr}(Z)(THF)n)y] (Z = I, CH(SiMe3)2, CH2Ph, H, N(SiMe3)2, OC6H,6-tBuMe; x = 2, 3; n = 1 or 2; y = 1 or 2) were made via salt metathesis of the potassium diamides (x = 3 (3), x = 2 (4)) and yttrium Cited by: Rare-Earth Half-Sandwich Dialkyl and Homoleptic Trialkyl Complexes for Rapid and Stereoselective Polymerization of a Conjugated Polar Olefin.

Organometallics32 Yttrium chelating diamide complexes in olefin and polar monomer polymerisation book Coordination Polymerization of Polar Vinyl Monomers by Single-Site Metal Catalysts. Chemical ReviewsYttrium complexes incorporating the chelating diamides Cited by: Novel yttrium chelating diamide complexes [(Y{ArN(CH2) xNAr}(Z)(THF)n)y,] (Z = I, CH(SiMe 3)2, CH2Ph, H, N(SiMe3)2, OC6H,6-tBuMe; x = 2, 3; n = 1 or 2; y = 1 or 2) were made via salt metathesis of the potassium diamides (x = 3 (3), x = 2 (4)) and yttrium triiodide in THF (5, 10), followed by salt metathesis with the appropriate potassium salt (,15) and further reaction with Cited by:   Conformationally Rigid Diamide Complexes: Synthesis and Structure of Titanium(IV) Alkyl Derivatives.

Organometallics15 (24), DOI: /om John D. Scollard and, David H. McConville. Living Polymerization of α-Olefins by Chelating Diamide Complexes of by:   Chelating Diamide Group IV Metal Olefin Polymerization Catalysts.

Organometallics20 (16), DOI: /oml. Sterically Demanding Chelating Diamide Complexes of Yttrium and Lutetium. Organometallics21 Zirconium(IV) Complexes Having a Rigid 1,8-Naphthalene Diamide versus a Flexible 1,3-Propylene Diamide for Olefin Polymerization.

Organometallics Stereocontrol in the Polymerization of Higher alfa-Olefin Monomers. ,   The novel group IV metal chelating diamide complexes [(2,6-diisopropylanilido)B(NMe 2)B(NMe 2)(2,6-diisopropylanilido)]MX 2, 7a (M = Ti, X = Cl), 7b (M = Ti, X = Me), and 8 (M = Zr, X = CH 2 Ph), have been prepared and characterized by 1 H and 13 C{H} NMR spectroscopy and single-crystal X-ray structure analysis (7a).These complexes are active polymerization catalysts upon combining.

Yttrium complexes incorporating the chelating diamides {ArN(CH 2)xNAr}2- (Ar = C6H ,6-iPr2, x = 2, 3) and their unusual reaction with phenylsilane Citing article May Complexes a,b are catalysts for the living polymerization of 1-hexene at 23°C.

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In the absence of monomer, complex b slowly evolves methane over the course of several hours to give a new pentane soluble derivative [RN(CH₂)₃NR]Ti[CH₂B(C₆F₅)₂](C₆F₅) (b) in quantitative yield as indicated by NMR spectroscopy.

In past decades, some monoalkyl rare-earth complexes (such as L 2 MR, L=ligand, M=metal, R=alkyl) with two ancillary ligands were found to be effective in the polymerization and copolymerization of ethylene and polar monomers, such as alkyl acrylates and lactones. However, the neutral complexes generally showed poor activity in the.

The resulting yttrium ethyl complex 7 was structurally characterized. The synthesis of d0 chelating diamide complexes and the role of the complexes in the polymerization of 1-hexene are.

Request PDF | Rare-Earth Half-Sandwich Dialkyl and Homoleptic Trialkyl Complexes for Rapid and Stereoselective Polymerization of a Conjugated Polar Olefin | Under ambient conditions, discrete half. Synthesis of polar vinyl monomer–olefin copolymers by α‐diimine nickel catalyst.

Maria M Marques. activated by methylaluminoxane was used as a catalyst system and trialkylaluminium was employed to block the polar groups for these polymerizations.

Polymerization activities of the order of magnitude of 10 6 in the case of vinyl acetate. Olefin polymerization with Ti complexes containing Tp or Tp * as a ligand The results of ethylene polymerization with TpTiCl 3 are listed in Table 4. The solubility of TpTiCl 3 in toluene was very poor and so a homogeneous CH 2 Cl 2 solution of TpTiCl 3 (10 ml) was added to toluene ( ml) containing MMAO and saturated with ethylene to start.

Alkyl (neutral and ate), cationic alkyl and hydrido complexes supported by nitrogen-containing ligands are considered. The polymerization-active complexes are classified according to monomer (ethylene, α-olefin, styrene), type of compound (neutral alkyl, cationic alkyl, ate-alkyl, hydrido) and the number of nitrogen atoms in supporting ligands.

It was demonstrated that Y[N(TMS)2]3, the neutral yttrium-diamine complex 13 and yttrium-NPS complexes 15 are efficient precatalysts for intramolecular hydroamination of aminoalkynes involving. CHELATE METAL-OLEFIN COMPLEXES R. NYHOLM Department of Chemistry, University College, London, W.C.

1 ABSTRACT The results of a series of investigations of the behaviour of potential olefin— phosphine and olefin—arsine chelate groups with transition metals are pre-sented. After a brief discussion of the nature of the metal—olefin bond the.

Titanium catalysts with diamide, phenoxy-imine, or indolide-imine chelate ligands have demonstrated living coordination polymerization of α-olefins. Diamide complexes of titanium, Ti-5 and Ti-6, are able to produce atactic propylene and simple α-olefins, but are unable to polymerize ethylene in a living manner.

When activated using MAO, it. According to the so-called MLX scheme, possible compositions of rare-earth metal hydride complexes are compiled in Fig. two families of molecular hydrides belonging to the class of neutral species of the type [Ln(L n X) 2 H] have been reported.

The first family includes metallocene hydrides [Ln(η 5-C 5 R 5) 2 H] 2 or [Ln(η 5-C 5 H 4 R′) 2 H] 2, whereas the second one. The polymerization mechanism of methyl methacrylate (MMA) catalyzed by rare-earth/phosphorus (RE/P) Lewis pairs has been systematically studied through density functional theory (DFT) calculations.

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Having achieved an agreement between theory and experiment, it is found that the polymerization of MMA mediated by int Rare Earth Chemistry – In memory of Professor Xu Guangxian at his centenary.

DOI: /()CO;2-C Corpus ID: Olefin Polymerization by Late Transition Metal Complexes-A Root of Ziegler Catalysts Gains New Ground. @article{MeckingOlefinPB, title={Olefin Polymerization by Late Transition Metal Complexes-A Root of Ziegler Catalysts Gains New Ground.}, author={S.

Mecking}, journal={Angewandte Chemie}. The present invention provides a process for the pressure modulated polymerization of one or more α-olefins having at least 3 carbon atoms, which comprises: contacting the monomer or monomers in a polar or non-polar solvent under polymerization conditions with a homogeneous catalyst system including: a) a cationic form of a racemic mixture of a chiral octahedral transition metal complex or of.

Request PDF | New Bis(allyl)(diketiminato) and Tris(allyl) Lanthanide Complexes and Their Reactivity in the Polymerization of Polar Monomers | The reaction of LnCl3(THF)n (Ln = La, n = 4; Ln = Y.

The ring‐opening copolymerization (ROCOP) of functional 4‐alkoxymethylene‐β‐propiolactones (BPL OR s) by yttrium‐bisphenolate complexes was investigated. The ROCOP of equimolar mixtures of BPL OR s of opposite configurations, namely (R)‐BPL OR1 /(S)‐BPL OR2 [R 1, R 2 =OMe, OAllyl, OCH 2 Ph (=OBn), OSiMe 2 tBu (=OTBDMS)], by the syndioselective Y{ONOO cum}/iPrOH catalyst.

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Hf analogue is also effective for the living polymerization, although its activity is lower than the Zr complex Ti complex with diamide ligand (63) is one of the earliest catalysts for living polymerization of 1-hexene at room temperature.3 Recent catalysts for living polymerization of 1-hexene and aoleï¬ ns include Zr complexes with.

This review article describes developments in chiral metallocenes as polymerization catalysts focusing on C2 symmetric ansa-zirconocene complexes.

Selective synthesis of rac-isomers of ansa-zirconocenes are surveyed. Isospecific polymerizations of propylene catalyzed by chiral zirconocenes are summarized.

Advanced series of polymerizations by chiral metallocenes such as asymmetric. Figure 2. Calculated Charges of the ligand and Zr metal of a model metallocene catalyst for ethylene polymerization (DFT calculations) [10]. These research efforts have led to the introduction of quite a few high-activity single-site catalysts based on both early and late transition metal complexes with various ligand environments [].In association with appropriate cocatalysts, many of.

able for a variety of radically polymerizable monomers such as methacrylates, acrylates,7,12 styrenes, and acrylonitrile,18 although the complexes and other conditions should be carefully chosen for each monomer.

Acrylamides are among the representative polar mono-mers in radical polymerization that contains oxygen and nitrogen. The monoborohydride lanthanide complex [Sm(Cp*) 2 (BH 4)(thf)] (1 a) (Cp* = η‐C 5 Me 5), has been successfully used for the controlled ring‐opening polymerization of ε‐caprolactone (ε‐CL).The organometallic samarium(III) initiator 1 a produces, in quantitative yields, α,ω‐dihydroxytelechelic poly(ε‐caprolactone) displaying relatively narrow polydispersity indices.

Recently, we have paid much attention to the synthesis of the half-sandwich Flu-ligated rare earth metal dialkyl complexes Flu’Ln(CH 2 SiMe 3) 2 (THF) n and their applications in the coordination–insertion (co)polymerization of olefins such as ST or conjugated dienes.

Inthese complexes displayed high activities up to × 10 7 (g of polymer)/(mol Ln h) and syndiotacticities up to.The polymerization of 4‐methyl‐1‐pentene proceeds by 2,1‐insertion with a selectivity of 92–97 %, and affords the polymer with methyl and 2‐methylhexyl branches.

2,1‐Insertion occurs selectively in all of the polymerization reactions of α‐olefins catalyzed by the dipalladium complexes.

Ethylene polymerization with the catalyst.LIVING α -OLEFIN POLYMERIZATION BY CATIONIC ZIRCONIUM AND HAFNIUM COMPLEXES CONTAINING CHELATING DIAMIDOPYRIDINE LIGANDS by PARISA MEHRKHODAVANDI (Honours) in Chemistry, University of British Columbia () Submitted to the Department of Chemistry In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY at the.