Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"Staudinger"”.
-
The physiology and pharmacology of some cellulose derivatives
… definition of macromolecules given in 1922 by Staudinger and Fritschi states that a macromolecule is a compound with more than 1,500 atoms and with a molecular weight exceeding 10,000; dissolved it shows colloidal properties and cannot be dialyzed.
-
Synthesis, antimalarial evaluation and structure-activity relationship in a series of dibenzlmethylamine (Dibemethin) derivatives of 4-amino-7-chloroquinoline
… side chains were synthesized using the Staudinger reduction of azides or the reductive amination via oxime of an aldehyde. Derivatives in which the para substituent on the terminal phenyl ring were altered from the parent compound (X = H) by replacement with Cl, OCH₃ orNMe₂ group were …
-
Synthese und Charakterisierung neuer Pentamethylcyclopentadienyl-Halbsandwichkomplexe des Tantals mit N-haltigen Liganden
… (20) wurde die Staudinger-Reaktion mit Triphenylphosphan durchgeführt. Im Laufe von 3 Tagen entstand in siedendem Toluol bei Anwesenheit eines Überschusses an Triphenylphosphan der azidoverbrückte Di(azido)-phosphoraniminato-Halbsandwichkomplex …
-
Auxiliares quirales derivados de carbohidratos: Nuevas aplicaciones
… as chiral auxiliaries in Pauson-Khand and Staudinger reactions, along with the synthesis of cyanohydrins, processes where the use of carbohydrates as chiral auxiliaries has been scarcely explored. Thus, the featured results constitute original solutions and a new concept of the use of …
-
Solubility of cellulose nitrate as a function of the degree of polymerization
… determined by viscosity measurements using the Staudinger viscosity equation (109) and then using a suitable solvent, a quantitative determination of the solubility of each fraction was to be attempted. From any solubility data obtained an attempt was to be made to determine if any relationship …
-
Principals' outlooks on suspension based on socioeconomic status, gender, years of experience, and school type
… of disciplinary actions (Skiba, Simmons, Staudinger, Rausch, Dow, & Feggins, 2003). The data collected was found to be significantly correlated with gender, years of experience, and school type.
-
Morphologie und Bruchverhalten von Block- und Multipfropfcopolymeren
Ziel der vorliegenden Arbeit war es, die Zusammenhänge zwischen der molekularen Architektur, Morphologie und den mechanischen bzw. bruchmechanischen Eigenschaften in S-SB-S-Triblockcopolymeren und deren Blends und in PI-PS-Multipfropfcopolymeren herauszuarbeiten und damit einerseits einen Beitrag …
-
Evaluation of mass transfer correlations for packed column air stripping of volatile organic contaminants from water supplies
The application of packed column air stripping systems to the removal of volatile organic contaminants (VOCs) from drinking water sources was investigated. The crucial element for the design of such systems exists in obtaining accurate predictions of mass transfer rates. The first phase of this …
-
Regioselective synthesis of curdlan derivatives
… iminophosphorane intermediate generated during Staudinger reactions was further investigated for subsequent syntheses: i) 6-amino or 6-amido-6-deoxycurdlan by in situ reaction with water or excess carboxylic anhydride, ii) 6-monoalkylamino curdlan by reductive amination using aldehydes and …
-
Single and hybrid antimalarials based on artemisinin, chloroquine and ß-lactams : synthesis, antiplasmodial activity, cytotoxicity and effect of selected artemisinin-chloroquine hybrids on the parasitic endocytosis pathway
… acetylene moiety were synthesized via the Staudinger and Ugi 3-component 4-centre condensation reactions. The compound with the best activity from the series was used to couple these reactions to post-condensation chemical modifications via the Mannich reaction, another multi-component …
-
Exploring the Chemistry of Bis(azido)phosphine Chalcogenides and the Pursuit of Isolable Phosphinidene Chalcogenides
… and their participation in chemoselective Staudinger reactions with secondary or tertiary phosphines to produce chiral phosphines. A tautomeric equilibrium of species was analyzed by 31P-31P nuclear Overhauser effect spectroscopy (NOESY). Thermogravimetric analysis (TGA) provided insights …
-
Preparation and Characterization of Carbohydrate-Functionalized Nanomaterials for Use as Cellular Probes and Targeted Delivery Vehicles
… and hydrocarbons were synthesized via modified Staudinger methodology with a high stereoselectivity. The stereochemistry at the anomeric center (alpha vs. beta) was readily controlled by choosing the appropriate reaction conditions. Typically, the alpha-stereochemistry arose from the reaction of …
-
Guanidinium Compounds: Synthesis, Oxoanion Binding, and Cellular Delivery
… photocaged phosphinothioesters for the traceless Staudinger ligation and attempts to install a diazo moiety site-selectively at the N-terminus of a peptide or protein.
-
Enzyme-mediated labeling of proteins and protein-protein interactions in vitro and in living cells
… be derivatized with a phosphine probe via the Staudinger ligation. We next turned to the goal of delivering quantum dots to the cytosol of living cells, which in the future may permit intracellular single-molecule imaging. We investigated viral methods of delivery, but found that our protocol …
-
Regioselective Synthesis of Novel Cellulose Derivatives for Drug Delivery
… groups were then reduced to amines using the Staudinger reaction. This very mild and selective reaction allowed the conversion of the azides to amines in the presence of the ester groups still attached to the cellulose backbone. Such derivatives could have properties useful for a range of …
-
Synthesis of Non-Natural Cyclic Di-Nucleotides for the Investigation of Bacterial Signaling Pathways
… strategies employed, the novel application of a Staudinger ligation to afford our abasic macrocycles and finally our progress towards implementing a bis-glycosylation strategy to install the desired nucleobase. We are able to efficiently provide large amounts of a di-amino, azide methyl ester, …
-
Material weight : the performativity of designed things in the space of corporate responsibility
This thesis is about designed things acting in the context of corporate responsibility (CR). It explores how designed things are mobilised by corporations to address CR issues. This research project was conducted by a designer through an interdisciplinary research project bringing together design, …
-
New Strategies for the Synthesis of Amines, Ethers and Small Strained Rings
… rings proceeds via a [2+2] Staudinger ketene cycloaddition from cis- or terminal olefins. Next, a complete optimization study for the generation of alpha,alpha-dichlorocyclobutanols via 1,2-addition of organocerium reagents is described. Last, a base-mediated quasi-Favorskii …
-
Photochemical synthesis of dihydroquinolinones and their investigation toward macrocycle synthesis via ring expansion
… and effect a SuRE macrocyclization following a Staudinger deprotection in the presence of triphenylphosphine. The intermediate was successfully synthesised, and while a trial reaction revealed promising results, this is still under investigation. Analysis of the product mixture by NMR suggested …
-
Regioselective Synthesis of Polysaccharide-based Polyelectrolytes
Polysaccharides are one of the most abundant and diverse families of natural polymers, and have an incredibly wide range of natural functions including structural reinforcement, energy storage, aqueous rheology modification, and communication and identity. Application of native polysaccharides like …
Page 1 of 2