Download or read book Ferrocenylpyrazolyl Nickel II and Palladium II Complexes as Pre catalysts for Ethylene and Higher alpha olefins Reactions written by Collins Obuah and published by . This book was released on 2014 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Evaluation of Ferrocenylpyrazolyl and Ferrocenylpyrazolyl phosphine Palladium and Nickel Complexes as Ethylene Oligomerization Catalysts written by Arnoux Van der Westhuizen and published by . This book was released on 2011 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pyrazolyl Nickel and Palladium Complexes as Catalysts for Ethylene Oligomerization and Olefins and Carbon Monoxide Co polymerization Reactions written by Collins Obuah and published by . This book was released on 2011 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pyrazole and Pyrazolylethylamine Nickel II and Palladium II Complexes as Catalysts for Olefin Oligomerization and Friedel Crafts Alkylation Reactions written by Lerato Petunia Moeti and published by . This book was released on 2014 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bis pyrazolyl Chromium III Nickel II and Palladium II Complexes as Ethylene Oligomerization and Polymerization Catalysts written by Nangamso Alicia Miti and published by . This book was released on 2008 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of pyrazolylphosphinite Nickel II and Palladium II Complexes and Their Catalytic Activity Towards Olefin Oligomerization written by Juliana Mana Edor and published by . This book was released on 2016 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alpha diimine Nickel II and Palladium II Complexes in Cross coupling Reactions written by Md Muktadir Talukder and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Complexes as Catalysts for Selective Olefin Oligomerisations written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the importance of alpha-olefin oligomers as intermediates and polymer building blocks for the chemical industry, new single-site catalysts systems that are more active and more selective are constantly being sought. Inserted in this context, we investigated the syntheses of novel organic ligands and the respective metal complexes, to be applied for ethylene and propylene oligomerisation. A group of tridentate imino-ligands was synthesised, which includes the 2,6-bis(imino)pyridines 1-2, the 2,6-diacetyl-monoiminopyridine 3, the iminophosphines 16, and the imidazo[1,5-a]pyridines 23c and 24a, and others, obtaining a range of different N, N, N- or N, N, O- or N, N, P-ligands through variation of the coordinating backbone and of the substituents. The corresponding iron(II) complexes were then prepared and tested for the ethylene oligomerisation in the presence of MAO as co-catalyst. The 2,6-bis(imino)pyridyl-, the 2,6-diacetyl-monoiminopyridyl-, and the iminophosphine iron(II) complexes 5-7, 17 were active catalysts and gave only linear olefins. Furthermore, different classes of bidentate ligands for nickel(II) complexes were synthesised, which are easily tuneable in their steric and electronic properties; for instance the imidazo[1,5-a]pyridines 23a-b and 24b-f, the 3-aminoacrylates 28, 29, and 31, the 3-aminoiminoacrylates 35 and 37. In particular, the syntheses of the differently substituted 3-aminoiminoacrylates required to be developed and optimised according to the different substituents at the acrylic backbone and at the aryl rings. The bidentate N, N-ligands 23a, 24b-d, 40, and 42 were used in their neutral form to yield the corresponding nickel(II) dibromide complexes. The rest of the ligands was deprotonated with sodium bis(trimethylsilyl)amide to yield their monoanionic form that next reacted with [(PPh3)2Ni(Mes)Br]. Two different classes of neutral nickel(II) complexes were obtained: in one class (45 and 46) the ligands actually coordinate as monodentate th.
Download or read book Neutral Nickel and Palladium Complexes of Chelating Anionic N heterocyclic Carbenes written by Benjamin E. Ketz and published by . This book was released on 2005 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pyrazolyl Palladium II Complexes as Phenylacetylene Oligomerization and Polymerization Catalysts written by Tebogo Vincent Segapelo and published by . This book was released on 2004 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pyrazolyl compounds have been extensively used to prepare metal complexes, but it is only recently that they have been investigated as catalysts for the polymerization of unsaturated hydrocarbons. In catalyzing the polymerization of ethylene, the electrophilicity of the metal centre plays an important role since the key step in the polymerization is coordination of the ethylene. A similar facile coordination would be expected for acetylene and one would therefore expect pyrazolyl palladium complexes to be good catalysts for the transformation of acetylenes. This thesis was an investigation of pyrazolyl palladium complexes as catalysts for the polymerization and oligomerization of substituted acetylenes.
Download or read book Nitrogen based Nickel and Palladium Complexes as Catalysts for Olefin Oligomerization Heck and Suzuki Coupling Reactions written by Simphiwe Maurice Nelana and published by . This book was released on 2007 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Catalytic Testing of Palladium and Nickel Based Intermetallic Compounds for Acetylene Semi hydrogenation written by Anish Dasgupta and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermetallic compounds often offer opportunities for synthesis of site isolated catalysts having precise active site coordination and morphology. They are also resistant to segregation effects (compared to random alloys) because of the high heat of formation of their unique electronically stabilized crystal structures. Due to predictable, periodic and easily reproducible nature of the isolated active sites, suitably chosen intermetallic compounds can act as excellent model systems for studying catalytic structure function correlation in different small molecule chemistries. In the current dissertation I utilized H2-D2 exchange in addition to ethylene and acetylene hydrogenation as the probe reactions of choice. My ultimate target is to understand and quantify the effect of active site (transition metal) isolation during the semi-hydrogenation of acetylene in an ethylene rich stream, which is a key step in industrial polyethylene synthesisa multi-hundred-billion-dollar industry. I studied two different classes of catalysts for this chemistry: Pd-(M)-Zn (M=Cu, Ag, Au) -brass intermetallics and Ni-Ga intermetallics. I used micron scale bulk materials as model catalysts because they provide greater compositional control and allows for studying the intrinsic catalytic property of the intermetallic, free from support and ligand effects.A significant part of the text is dedicated to the synthesis, characterization and catalytic study of the bulk Pd-(M)-Zn ternary -brass phase materials because of its unique adaptability in terms of developing a family of closely related model catalysts having Pd-M-Pd active sites (M=Pd, Zn, Au, Cu and Ag) which can change the semi-hydrogenation activity and selectivity by two orders of magnitude even when only one atom is changed per 52 atom unit cell. As an extension of this project I also report several Pd-Ni-Zn and Pd-Pt-Zn ternary -brass phases and determine their atomic site occupancy factors.During the course of my research I realized there were no reported methods for synthesizing Pd-Zn and Ni-Zn -brass intermetallics as catalytically relevant supported nano-particles (NPs). I developed and optimized a hybrid generalized synthesis approach for SiO2 supported Pd-Zn, Ni-Zn and Cu-Zn -brass NPs. I also provide preliminary evidence that this approach can be easily extended to the synthesis of ternary NPs as well.In the case of Ni-Ga intermetallics, I tried to understand the role of Ga in controlling acetylene semi-hydrogenation. I observed a reversal in the ethylene selectivity trend with Ga content between 85 C and 160 C which is unexpected based on published DFT calculations. Previously, it has been suggested that Ga simply acts as a spacer for isolating Ni/Pd active sites much like Zn in the case of Ni-Zn catalysts (studied by Charles Spanjers from our research group). However, Ga has a higher affinity to hydrogen compared to Zn and I attempted to investigate if Ga may have a weak but non-negligible catalytic contribution towards hydrogenation which has typically not been previously considered in any detail in the case of acetylene semi-hydrogenation on metallic catalysts. Additionally, I provide understanding behind the high acetylene semi-hydrogenation selectivity of Ni5Zn21 catalyst which was originally reported by Spanjers et al. (J. Catal. 2014). This involved identifying the site occupation factor of Ni and Zn in the -brass lattice for materials having greater than 15.4 at% Ni. It is determined that (unlike Pd-Zn -brass) exactly single atom Ni1 active sites are exposed on the surface irrespective of the Ni concentration (even though Ni3 clusters are present in the bulk) which explains the suppression of over-hydrogenation and oligomerization on this catalyst, resulting in the high ethylene selectivity reported by Spanjers et al.
Download or read book Synthesis of New Iron and Nickel Complexes written by Anthony Kermagoret and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: My Ph-D thesis concerns the study of the catalytic oligomerization reaction with nickel, iron and cobalt complexes coordinated by N-O, P-N, N-P-N, P-O and P-N-P type ligands with a N donor atom represented by an oxazoline or a pyridine heterocycle. These complexes activated by a cocatalyst such as MAO or AlEtCl2 showed high activities and a high selectivity of C4 olefins in ethylene oligomerization. The nickel complexes with P-N chelates showed a high impact of the P substituents on the oligomerization selectivities. Moreover, the crystallographic studies on nickel complexes coordinated by N-O and P-N type ligands showed the formation of mono-, di- and tetranuclear complexes. The cobalt, iron and palladium complexes with N-P-N ligands highlighted original N-N, P-N or N-P-N coordination modes of the ligands influenced by the ligand substituents and the metal center.
Download or read book Nickel II and Palladium II Complexes of 2 3 bis diphenylphosphino Maleic Anhydride written by H. J. Becher and published by . This book was released on 1977 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nickel Precatalysts as Enabling Tools for Catalytic Coupling Reactions written by Eric Alan Standley and published by . This book was released on 2015 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Chemical formula] A series of air-stable nickel complexes of the form L2Ni(aryl)X (L = monodentate phosphine, X = Cl, Br) and LNi(aryl)X (L = bis-phosphine) have been synthesized and are presented as a library of precatalysts suitable for a wide variety of nickel-catalyzed transformations. These complexes are easily synthesized from low-cost NiCl2-6H2O or NiBr2-3H2O and the desired ligand followed by addition of 1 equiv of Grignard reagent. A selection of these complexes were characterized by single-crystal X-ray diffraction, and an analysis of their structural features is provided. [Chemical formula] The air-stable nickel(II) complex trans-(PCy2Ph)2Ni(o-tolyl)Cl was employed as a precatalyst for the Mizoroki-Heck-type, room temperature, internally selective coupling of substituted benzyl chlorides with terminal alkenes. This reaction, which employs a terminal alkene as an alkenylmetal equivalent, provides rapid, convergent access to substituted allylbenzene derivatives in high yield and with regioselectivity greater than 95:5 in nearly all cases. The reaction is operationally simple, can be carried out on the benchtop with no purification or degassing of solvents or reagents, and requires no exclusion of air or water during setup. Synthesis of the precatalyst is accomplished through a straightforward procedure that employs inexpensive, commercially available reagents, requires no purification steps, and proceeds in high yield. [Chemical formula] The nickel-catalyzed cross-coupling of aliphatic N-tosylaziridines with aliphatic organozinc reagents is described. The reaction protocol displays complete regioselectivity for reaction at the less hindered C-N bond, and the products are furnished in good to excellent yield for a broad selection of substrates. An air-stable nickel(II) chloride/ligand precatalyst was also developed and employed for the reaction. In addition to increasing the activity of this catalyst system, this also greatly improves the practicality of this reaction, as the use of the very air-sensitive Ni(cod)2 is avoided. Finally, mechanistic investigations, including deuterium-labeling studies, show that the reaction proceeds with overall inversion of configuration at the terminal position of the aziridine by way of aziridine ring opening by Ni (inversion), transmetallation (retention), and reductive elimination (retention).
Download or read book Copolymerization of Higher Olefins with Carbon Monoxide by Pd II Catalysts and Design of Nickel Palladium and Zirconium Complexes with Nitrogen based Ligands written by Mika Kettunen and published by . This book was released on 2004 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metals and Organometallics as Catalysts for Olefin Polymerization written by Walter Kaminsky and published by Springer. This book was released on 1988 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
