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Dissertations / Theses on the topic 'Trimerization'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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1

Snellman, A. (Anne). "Characterization of chain association in collagen types XII and XIII and other biochemical features of type XIII collagen using baculovirus-directed insect cell expression." Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:9514257464.

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Abstract Type XII minicollagen chain association was studied using baculovirus-directed insect cell expression. Since insect cells contain low endogenous prolyl 4-hydroxylase activity, the mechanism of the effect of prolyl hydroxylation on trimer formation in this collagen could be studied directly by adding recombinant baculoviruses directing the synthesis of prolyl 4-hydroxylase. Prolyl 4-hydroxylase was shown to be involved in the trimeric assembly process of type XII collagen through its α subunit, and thus through its hydroxylase activity. The transmembrane protein type XIII collagen was
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2

Albahily, Khalid. "Study of the Factors Affecting the Selectivity of Catalytic Ethylene Oligomerization." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20088.

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Over the past decade, advances in ethylene oligomerization have witnessed explosive growth of interest from both commercial and academic standpoint, with chromium metal invariably being the metal of preference. A common feature in this literature was the extended long debate regarding the mechanism, metal oxidation states responsible for selectivity and the role of the ligand. This thesis work embarked on the isolation and characterization of new active intermediates called “single component catalysts” (or self activating) to address two important questions: (1) how the catalyst precursors re-
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3

Gregori, Bernhard [Verfasser]. "3d-Metal catalyzed reductive transformations and isomerizations: hydrogenation of unsaturated compounds and trimerization of alkynes / Bernhard Gregori." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2021. http://d-nb.info/1237817188/34.

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4

Thapa, Indira. "The Challenge of Selectivity in Ethylene Oligomerization: Ligand Design and Metal Valence States." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23188.

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Catalytic ethylene oligomerization is a well understood industrially viable process. The large majority of scientific literature and patents concerning this process has been developed with the use of chromium catalysts. Commercial systems producing selective tri/tetramerization, non-selective oligomerization and polymerization are all based on this metal with the exception of a few systems based on other transition metals (Zr, Ti, Ni etc.). This versatility raises interesting questions about chromium’s unique behaviour. Essentially, selective or non-selective oligomerization and polymerization
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5

Siebert, Max [Verfasser], and Oliver [Akademischer Betreuer] Trapp. "Optimization of the selective ruthenium-catalyzed carbon dioxide reduction to dimethoxymethane and mechanistic investigation into the acetate-initiated catalytic trimerization of aliphatic isocyanates / Max Siebert ; Betreuer: Oliver Trapp." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1216039437/34.

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6

Kwon, Doo Hyun. "Computational Design and Analysis of Molecular Ethylene Oligomerization Catalysts." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8551.

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Linear alpha olefins (LAOs) are key petrochemical precursors for the synthesis of larger polymers, detergents, plasticizers, and lubricants. Most catalytic ethylene oligomerization processes generate a wide distribution of LAO carbon chain lengths. A major ongoing industrial challenge is to develop homogeneous catalysts that result in selective and tunable ethylene oligomerization to 1-hexene and 1-octene alkenes. Quantum mechanical calculations coupled with rapidly advancing technology have enabled the ability to calculate small molecule systems with high accuracy. Employing computational mod
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7

Cordier, Astrid. "Oligomerization and polymerization of ethylene by phenoxy-imine titanium catalysts." Thesis, Lyon, 2019. https://n2t.net/ark:/47881/m64q7tb8.

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L’hexène-1 est une des oléfines les plus importantes puisqu’elle est principalement utilisée comme comonomère pour la production de polyethylenes (HDPE, LLDPE), matériaux aux diverses applications à l’échelle mondiale. Dans le domaine de la trimérisation sélective de l’éthylène par voie catalytique, quelques complexes de titane portant un ligand phenoxy-imine tridente (SFI) et activé par le méthylaluminoxane (MAO) sont les plus actifs et sélectifs parmi les systèmes au titane. Néanmoins, la polymérisation de l’éthylène est une réaction secondaire inhérente à ces systèmes. Même si cette product
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8

Shaikh, Yacoob. "Towards Selective Ethylene Tetramerization." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23161.

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There is an increasing trend towards advancing the understanding and development of ethylene oligomerization catalysts, both in academia and industry. The metal of choice in this chemistry is invariably chromium, which has shown great versatility in selective trimerization/tetramerization, non-selective oligomerization and polymerization of ethylene. While much success has been achieved in ethylene trimerization, the same con not be said about tetramerization catalysis. Aminophosphine based ligands have demonstrated their ability towards selective 1-octene production, however, the popular PNP
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9

Yang-Jun-Nam and 楊俊南. "A Novel Organotungsten Lewis Acid and Catalytic Aldehyde Trimerization Reactions." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41974465954583217196.

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碩士<br>國立中正大學<br>化學研究所<br>92<br>Abstract The research goal of this thesis is to study organometallic Lewis acids catalyzed aldehyde trimerization reactions under various conditions. As for the green chemistry concern, our strategies are to design processes to shorten reaction time, to increase product yields, to cut down energy usage, and to reduce chemical wastes. The precursor [A(2-py3)]M(CO)3 (A = P, OP, M=W, Mo) can be prepared in one pot in several minutes under microwave irradiation conditions. The method gave high purity products in exclusive yields without further
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10

Chen, Hui-Chuan, and 陳慧娟. "Photofrin® induces covalent dimerization / trimerization of caspase-3 and modulates anticancer drug-triggered cell death." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/63807272332702139797.

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碩士<br>長庚大學<br>基礎醫學研究所<br>92<br>Photofrin® is the first generation photosensitizer for photodynamic therapy (PDT), which is approved for treatment of cancer and some other diseases. Previous work from our laboratory indicated that PDT with Photofrin® targeting to distinct subcellular site results in different death phenotypes of A431 cells (Hsieh et al., 2003). Following that study, we found that Photofrin® induced formation of the two high-molecular- weight (HMW) forms of caspase-3 in various human cell lines. Photofrin® induces the formation of two HMW forms of caspase-3 is dose- and time-dep
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11

Ashman, Jonathan B. "A role for the transmembrane domain in the trimerization of the MHC class II-associated invariant chain /." 1999. http://wwwlib.umi.com/dissertations/fullcit/9934023.

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12

Chi, Han-Hsiang, and 錡瀚翔. "Synthesis of Lantern-type Trinuclear Nickel Complexes and Trimerization of Nitriles Mediated by the Inverted-Sandwich Vandium Complex." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/my9neu.

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碩士<br>國立清華大學<br>化學系所<br>105<br>The first part of this thesis aim for the synthesis of the Low-valent, low-coordinate tetranuclear metal complexes (M = Al, Ni) by the use of tetradentate multinitrogen ligand (2,7-bis(2,4,6-trimethylanilinyl)-1,8-naphthyridine (H2(N2N2)Mes) (Mes = 2,4, 6-Me3C6H2) under mild conditions. We intended to work with free ligand as such. Treatment of H2(N2N2)Mes with AlMe3 and AlEt2Cl produced dinuclear {AlMe[μ-κ4-(N2N2)Mes]}2 (1), {AlCl[μ-κ4-(N2N2)Mes]}2 (3)and{AlEt[μ-κ4-(N2N2)Mes]}2 (4)respectively. Interestingly, reaction of H2(N2N2)Mes with 1.5 equivalents Ni(COD)2
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13

Schofer, Susan Jessica. "The Effect of Ligand Array on Stereocontrol and Molecular Weight in Metallocene-Catalyzed α-Olefin Polymerization and (PNP)CrPh₃ Complexes as Well-Defined Ethylene Trimerization Catalysts". Thesis, 2004. https://thesis.library.caltech.edu/2444/1/Ch1.pdf.

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<p>A series of neutral and cationic group 4 and neutral group 3 model complexes of the Me₂Si(η⁵-C₅H₄)(η⁵-3-(CMe₃)-C₅H₃)(tBuSp) ligand have been prepared: tBuSpZrCl₂(1), tBuSpZr(CH₂SiMe₃)₂ (8), tBuSpZrMe₂ (9), [tBuSpZrH₂]₂ (10), tBuSpZrMeCl (11), tBuSpZrMe(CH₂CMe₃) (12), tBuSpZrMe(CH₂SiMe₃) (13), tBuSpScCl(THF) (14), tBuSpScCH(SiMe₃)₂ (17), [tBuSpScH] (18), and tBuSpTiCl₂ (19). The kinetically preferred isomers of 12 and 13 have been identified, and in both cases the syn isomer is preferred. We have obtained solid state structures of [tBuSpZrH₂]₂ (10), tBuSpZrMeCl (11), tBuSpZrMe(CH₂CMe₃) (1
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14

Hodík, Tomáš. "Homogenní a heterogenní titaničité komplexy pro selektivní trimerizaci ethylenu na 1-hexen." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-350911.

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This diploma thesis is focused on the design and synthesis of new half-sandwich titanium complexes for anchoring to selected supports (SiO2, SBA-15) and the study of their catalytic activity and selectivity in ethylene trimerization to 1-hexene. The synthetic strategy of half-sandwich titanium complexes with a suitable leaving group for direct anchoring through Ti−O bond was carried out (Cl, Oi-Pr). In addition, the titanium complexes with pendant alkenyl group were prepared and utilised for anchoring to a SiMe2H modified support by Pt-catalysed hydrosilylation reaction. Prepared compounds wer
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15

Lin, Wei-chih, and 林威志. "Palladium-Catalyzed Trimerizations of Terminal Arylalkynes: Synthesis of 1,3-Diaryl-2-arylethynyl-1,3-butadienes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28292555433736809099.

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碩士<br>國立成功大學<br>化學系碩博士班<br>96<br>Various 1,3-diaryl-2-arylethynyl-1,3-butadienes 7 have been generated by the Pd-catalyzed trimerization of arylalkynes 4. Based on this synthetic method, fifteen dienyne derivatives have been prepared in 23-94% yields. This procedure provides high regioselectivity to generate adducts Z-7 in moderate to excellent yields. Their structures and stereochemistry have been confirmed by the X-ray crystal analyses. To the best of our knowledge, this is the first example to generate a dienyne with this skeleton by trimerization of a terminal alkyne. The scope, limitation
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16

Cloutier, Maryse. "Modulation du trafic des molécules de classe II par l’isoforme p35 de la chaîne invariante." Thesis, 2019. http://hdl.handle.net/1866/23954.

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La chaîne invariante (Ii) agit à titre de chaperon dans l’assemblage et le trafic des molécules du complexe majeur d’histocompatibilité de classe II (CMHII). Chez l’humain, les deux isoformes prédominantes, p33 et p35, diffèrent par la présence d’un motif di-arginine (RXR). Ce dernier permet la rétention de p35 au réticulum endoplasmique (RE) jusqu’à son masquage par une molécule de CMHII. La chaîne invariante forme des trimères auxquels s’associent successivement jusqu’à trois dimères αß de CMHII résultant en la formation de pentamères, heptamères et nonamères. Toutefois, la stœchiométrie exa
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17

Bai, Yunpeng. "Understanding the biological function of phosphatases of regenerating liver, from biochemistry to physiology." Thesis, 2014. http://hdl.handle.net/1805/5675.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Phosphatases of regenerating liver, consisting of PRL-1, PRL-2 and PRL-3, belong to a novel protein tyrosine phosphatases subfamily, whose overexpression promotes cell proliferation, migration and invasion and contributes to tumorigenesis and metastasis. However, although great efforts have been made to uncover the biological function of PRLs, limited knowledge is available on the underlying mechanism of PRLs’ actions, therapeutic value by targeting PRLs, as well as the physiological function of PRLs in vivo. To answer these questi
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