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Showing 1 to 20 of 1014 for “"Chiral"”.
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Investigations of chiral recognition of conformationally rigid chiral stationary phases
… the development of conformationally rigid chiral stationary phases (CSPs) has been a goal. Several conformationally rigid CSPs derived from $\alpha$-amino-lactams have been prepared and their abilities to separate the enantiomers of a variety of analytes have been evaluated. $\pi$-Acidic …
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Chiral Polymer Photodetector
… is fabricated using polythiophene with chiral alkyl side chains. The Cotton effect is observed in the CD spectrum of the photodetector, indicating an unequal absorbance of left- and right-handed circular polarized light (CPL). The photodetector is proven to be able to identify incident …
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Dynamics of Chiral Fermions
… containing Weyl fermions respecting some chiral symmetry. There are severe challenges in lattice regularising such theories and chiral gauge theories, where a non-anomolous chiral symmetry is gauged, can display interesting strong coupling dynamics such as confinement without chiral …
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CoMFA Study of Chiral Catalysts
A QSAR using Comparative Molecular Field Analysis (CoMFA) is developed for a set of 23 catalysts containing bis-oxazoline or phosphino-oxazoline ligands that are known to induce asymmetry during the Diels-Alder reaction of N-2-alkenoyl-1, 3-oxazolidine-2-one with cyclopentadiene. It is shown that …
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New axially chiral amine organocatalysts
… up to 37% seen. The first example of an isolated chiral hydrazinium salt being used as a nitrogen transfer reagent for the aziridination of enones is also described. Secondly, a range of α-substituted secondary amines based on the binaphthyl backbone has been synthesized from easily accessible …
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Investigations of Chiral Recognition Processes
… (CEC), was also investigated. The chiral selector was bonded to silica support (3 mum, 100 A pore size), packed into capillaries (100 mum i.d.), and evaluated under different conditions to determine optimal chromatographic performance.
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Methods Development in Chiral Chromatography
Chiral stationary phases derived from N-3,5-dinitrobenzoyl amino acids, amides of 1-aryl-1-alkylamines and N-2-naphthyl amino acids have proven to be viable sorbents for the direct liquid chromatographic separation of enantiomers. In an effort to extend the utility of these chrial stationary …
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Applications of Chiral Nmr Solvents
Made available in DSpace on 2014-12-10T23:01:22Z (GMT). No. of bitstreams: 1 7219888.pdf: 3559423 bytes, checksum: d331bfa23f980499c84a6fb1e646b446 (MD5) Previous issue date: 1972
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Nmr Spectroscopy in Chiral Solvents
Made available in DSpace on 2014-12-09T17:36:29Z (GMT). No. of bitstreams: 1 7013241.pdf: 5951930 bytes, checksum: b666f6e3943a05ab675d4b201eeea9f6 (MD5) Previous issue date: 1969
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Chiral Phases on the Lattice
While chiral quantum field theories (QFTs) describe a wide range of physical systems, from the standard model to topological quantum matter, the realization of chiral QFTs on a lattice has proved to be difficult due to the Nielsen-Ninomiya theorem and the possible presence of quantum anomalies. In …
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Borox catalysis : a new frontier in chiral Bronsted acid catalysis derived from chiral borate anions
… focus has been on the development of the new chiral Brønsted acid catalysts, large-scale synthesis, novel reaction methodologies and understanding their mechanisms by experimental/computational analysis. In due course of time, a pool of unprecedented chiral Brønsted acid catalysts known to be …
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Synthesis and application of chiral dienes and chiral imidates as ligands for transition metal catalysis
… two main ligandclasses have been studied: chiral diene ligands and chiral imidate ligands. We developed a novel route to synthesize chiral disubstituted bicyclo[2.2.1]heptadienes (R= i-Bu, c-Hex, Benzyl and allyl) starting from enantiomerically pure bistriflate. The synthesized diene …
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The use of chiral auxiliaries in the synthesis of chemically and biologically important chiral compunds
Chiral synthons of chemical and biological importance have been synthesised using imidazolidinone and Evans' oxazolidinone chiral auxiliaries (CA). The thesis comprises two parts, which were carried out at the Universities of Cape Town, RSA and University of Michigan in the USA. In part 1, carried …
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Asymmetric nucleophilic catalysis with planar-chiral DMAP derivatives and chiral phosphines : synthetic and mechanistic studies
… isopropyl carbonate, through the use of a planar-chiral DMAP derivative (an acylation catalyst) in combination with a ruthenium complex (an alcohol-racemization catalyst). Chapter 2 describes the development and detailed mechanistic investigation of the enantioselective synthesis of tertiary alkyl …
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Chiral Separations on HPLC Derivatized Polysaccharide CSPs: Temperature, Mobile Phase and Chiral Recognition Mechanism Studies
Direct chiral separations of the non-steroidal drugs of 2-methylarylpropionic acids (profens) on the chiral stationary phases (CSPs) of amylose tris(3,5-dimethylphenyl-carbamate), Chiralpak AD, and cellulose tris(3,5-dimethylphenylcarbamate), Chiralcel OD, were investigated. Chiralpak AD and …
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Studies on new approaches of chiral discrimination for chiral analysis by regression modeling of spectral data.
Two new approaches of chiral discrimination for enantiomeric composition analysis using isotropic spectroscopic techniques and multivariate regression modeling were investigated. This is in view of the urgent need for rapid and improved strategies for chiral analysis due to the rising preference …
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Synthesis and Use of Chiral Surfactants.
… shown that micelles formed from surfactants with chiral head groups serve to induce a chiral reaction medium, leading to enhanced enantioselectivities in the reaction products. This utilization of chiral surfactants will offer an economical alternative to traditional chial solvents while …
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α-Formylations with Chiral Chloroiminium Salts
… α-methyl indanone and α-methyl tetralone using chiral chloroiminium salts derived from (S)-proline. The asymmetric reactions gave enantiomeric excesses of up to 68%.
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Chiral Organometallic osmium(VI) Nitrido Complexes
The chiral-at-metal complex [Os(N)(CH2SiMe3)MeCl 2]- forms in a reaction of a mixed tetraalkyl osmium nitrido complex with pyridinium chloride. Reactions between Ag2CrO 4 and [Os(N)(CH2SiMe3)MeCl2] - or [Os(N)(CH2SiMe3)PhCl2] - give chiral-at-metal heterobimetallic complexes that catalyze the …
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Nonlinear optical properties of chiral media.
… interfaces. Optical processes are considered in chiral liquids and at chiral surfaces to second order in the applied electric fields, and to third-order in fluids. Time-dependent perturbation theory is used to describe the response of molecules to electromagnetic fields in terms of molecular …
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