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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"Aryl groups"”.
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Structure-property studies of conjugated 1,8-naphthalic anhydrides
… were designed and synthesized using a variety of aryl groups with different donor strengths. This allowed detailed analysis on how the aryl groups, as well as the position, affect the electronic and photophysical properties of the system. Both series showed a range of quantum yields, …
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C-H Activation of Functional Materials
… and good d.r., with many different functional groups and substitution patterns being tolerated. Further transformation of the lactam was also demonstrated, yielding pyrrolidines and functionalised lactams. Chapter 2 describes the development of a carboxylate directed C-H arylation of azulene at …
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The N-H stretching frequency of substituted hydrazines
… R and R' (where R & R' are either alkyl or aryl groups) on the N-H stretching and bending frequencies of substituted hydrazines. In this project an investigation was undertaken to correlate the N-H stretching and bending frequencies of 1, 1-disubstituted hydrazines. The difference between Vs …
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STEREOSPECIFIC SUZUKI-MIYAURA CROSS-COUPLING OF CHIRAL BENZYLIC BORONIC ESTERS AND VINYL BROMIDES
… to prepare flat, Csp2-Csp2 bonds between two aryl groups. Since most bioactive compounds contain several 3-D or chiral centers, it is more desirable to make bonds between sp2-sp3 and sp3-sp3 carbon centers. However, when dealing with sp3 carbons in cross-coupling chemistry, new challenges …
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Advances in the synthesis of indazoles: regioselective C-7 functionalization by directed ortho metalation and progress towards indazole based azaborine compounds
… ortho Metalation (DoM) reactions at the C-3 aryl groups of substituted indazoles towards azaborine targets were unsuccessful. Internal alkyne bearing substituted indazole was subjected to hydroboration conditions but without any conversion to the desired products. C-3 protected Indazoles …
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Catalytic C-N and C-F bond formation by organometallic group 11 complexes
… buffers improve reaction efficiency. A study of aryl-substituted alkynes suggests that electron-poor aryl groups favor shorter reaction times and higher regioselectivity of fluorination. A heavily fluorinated phenanthroline ligand supporting a cationic copper(I) catalyst allows efficient …
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BINOL-Catalyzed Asymmetric Synthesis of Chiral Heterocycles; Experimental Mechanistic Study of Binol-Catalyzed Conjugate Addition of Vinylboronic Acids to Enones; Enantioselective Synthesis of Diarylalkane Compounds via Binol-Catalyzed Conjugate Addition
… showing great compatibility with different heteroaryl structures. Along with that, a new BINOL catalyst was introduced that exhibited superior catalytic activity to previously used catalysts. As proposed for previous studies, the rate determining step of the transformation was the carbon-carbon …
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Early transition metal catalysts for the living polymerization of olefins and alkynes
… of the mesityl amido substituents in [ArylNpy]2- hafnium complexes with aryl groups containing chlorines or fluorines (especially the latter) in the ortho positions was found to be detrimental to the development of living olefin polymerization catalysts of this general type. The …
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ΜΕΛΕΤΗ ΟΞΕΙΔΩΣΗΣ ΟΞΙΜΙΝΙΚΩΝ ΚΑΙ ΙΜΙΝΙΚΩΝ ΠΑΡΑΓΩΓΩΝ ΚΑΡΒΟΝΥΛΙΚΩΝ ΕΝΩΣΕΩΝ
… INFLUENCE IS ALSO EXERCISED BY ALKYL OR ARYL GROUPS ADJACENT TO THE =NOH MOIETY. DEOXYGENATION OF THE ABOVE N- OXIDES WITH TRIETHYL PHOSPHITE PROCEEDSVERY DIFFICULTY TO THE PARENT RING SYSTEM, WHEREAS DIELS-ALDER REACTION AND IRRADIATION WITH MERCURY LAMP WERE UNSUCCESSFUL. FURTHERMORE, …
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Design and synthesis of HIV-1 integrase inhibitors
… scaffolds containing three specific functional groups. Each molecule was designed to contain the core functional motif (a,b-diketoamide), optimal aryl groups (3-benzylphenyl or substituted 3-benzylphenyl) and a terminal group (proton donor or acceptor or amphoteric functional groups) in a planar …
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Structural Studies in Tellurium Chemistry
… the strong trans effect of aromatic and aryl groups in tellurium complexes.
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The synthesis and structural characterisation of novel 4- and 5- membered nitrogen heterocycles derived from azoacetates
… that azo compounds not containing two aromatic groups are unstable. The syntheses of a number of novel heterocycles including important medicinal structures directly linked to an arylazo moiety are reported. The literature survey introduces a range of four and five membered heterocycles with …
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Stereochemistry of small molecules: Configurational and conformational control
… of lithio-cyclopropylnitriles bearing chelating groups for intramolecular coordination, as a possible strategy to impart configurational stability. Although this strategy has not yet been successful, using density functional theory (DFT) method, we addressed the effect of chelating groups on …
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Functional Metal Phosphonates
… that had covalently attached organic functional groups. In some cases, these ligands undergo reactions during the solvothermal syntheses which can impart new chemical reactivity. Another method used to introduce functionality was to partially or completely substitute metal atoms within …
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Synthesis of Biologically Relevant Sphingolipid Analogues
… such that future introduction of different aryl groups is straightforward. Throughout the synthetic coarse, we gained access to a number of structural analogues, which provided more insight into the structure-activity relationship of this class of compounds. Biological evaluation, both in …
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Applications of Brush-Type Chiral Stationary Phases in New Chromatographic Techniques
… that enhance chiral discrimination within the 5-aryl hydantoin family of compounds. Addition of increased pi-basic aryl groups at the chiral center along with alkylation of the imide and amide nitrogens provides improved enantioseparation of the racemic compounds. The development of a means of …
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Development and mechanistic investigation of the palladium-catalyzed α-arylation of aldehydes and N-arylation of ammonia
A general method for the palladium-catalyzed α-arylation of aldehydes was developed to couple linear and branched aldehydes with electron-poor and electron-rich bromo- and chloroarenes in high yields. Catalysts generated from allylpalladium chloride (APC) and 1,1’-diphenylphosphinoferrocene (DPPF) …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
… of GO were functionalized by treatment with aryl diazonium salts. The functionalized nanosheets disperse readily in polar aprotic solvents. A one-pot method has also been developed for reducing GO and simultaneously functionalizing it with alkyl and aryl groups. The alkyl functionalized …
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