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.
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Showing 1 to 20 of 51 for “"Fine Chemicals"”.
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Green Photochemistry: The synthesis of fine chemicals with sunlight
This research examines the dye-sensitised photooxygenation procedure as a case study to demonstrate ‘green’ photochemistry. There are three main streams to the research, namely the optimisation of juglone (5-hydroxy-1,4-naphthoquinone) synthesis under green conditions, the extension of the …
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Novel methods and processes for the chiral resolution of fine chemicals
… or even be harmful. Most pharmaceuticals and agrochemicals arechiral. The search of this specificity at the molecular level led to the development of manyasymmetric syntheses. However, the enantioselective synthetic approach is not alwayspossible and the mixture of equal amounts of both …
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Polymer-based solvents for minimizing pollution during the synthesis of fine chemicals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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An investigation into the use of ultrasound in the synthesis of fine chemicals
The application of ultrasound to the oxidative dimerisation of pivalic acid to tetramethyladipic acid (TMAA; 2,2,4,4-tetramethylhexa-1,6- dioic acid) using Fenton's reagent is described. Various parameters of the reaction were investigated (gas, equivalents of reagents, temperature, and sonication) …
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The relationship between structure and specificity in the plant nitrilases
… reactions are important in the manufacture of fine chemicals, pharmaceutical intermediates, plastics and paints. Industrial uses of nitrilases are limited however, as wild-type enzymes suffer from limitations such as: a lack of control of the acid:amide ratio of products, and limited …
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Microreactor technology : scale-up of multiphase continuous flow chemistries
… purposes, especially in the pharmaceutical and fine chemicals industry. The challenge is how to get benefit of the transport rates inherent to microreactors while increasing the throughput for production applications. Two approaches to increase production rate are possible: a) scale-out by …
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Laminar Flow-Based Microchemical Systems for Power Generation, Electrochemical Synthesis, and Biological Cell Studies
… systems for (1) biocatalytic synthesis of fine chemicals by microscale-enabled efficient regeneration of cofactors, as well as for (2) the study of intestinal stem cells on a surface that mimics their in vivo environment. In the first system, the ability to focus reagent streams close to …
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The development and improvement of biocatalytic reactions
… ecological production route for a wide range of fine chemicals, pharmaceuticals and food ingredients. In addition to biocatalysis, miniaturised chemistry has also become of interest and significance to the chemical industry over the last decade. Microreactors allow for the synthesis of small …
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Synthesis of new recoverable catalysts and their application in asymmetric reduction of ketimines with trichlrosilane
… building blocks for the pharmaceutical and other fine chemicals industries. Metal-free oranocatalysis can be viewed as an attractive and broadly applicable methodology in which the metal is not vital for the key bond-forming event. Previously developed in our laboratory, N-methylvaline-derived …
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Immobilized Bis-Indenyl Ligands for Stable and Cost-Effective Metallocene Catalysts of Hydrogenation and Polymerization Reactions
… are widely used in industry for manufacture of fine chemicals, pharmaceuticals, and plastics. Homogeneous catalysts for the processes that have low stability and their separation is difficult. Therefore, the development of new highly active and stable catalysts for hydrogenations and …
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Continuous separation and recycle of homogeneous catalysts in small scale flow system
… has transformed the way both bulk and fine chemicals are produced. When such catalysts are applied in fine chemicals production, the presence of toxic heavy metals in these catalysts (Pd, Pt, Ru, Rh, etc.) can pose significant separation challenges. Regulatory bodies (such as the FDA …
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Development of Sustainable Catalytic Systems For Oxidation Reactions
… application in the production of both bulk and fine chemicals, pharmaceuticals, agrochemicals and many more. Despite this, oxidations are often avoided due to the environmental and economic problems associated with traditional, stoichiometric oxidising agents. Within this thesis, three methods …
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Engineering polymeric hollow fiber membrane reactors for sustainable chemical transformation reactions
… production of pharmaceuticals, fine chemicals, and agrochemicals, as well as upgrading of biomass feedstocks. Immobilization of organocatalysts and metal nanoparticles on continuous-flow microreactors offers an efficient catalytic system that exploits and enhances the advantages …
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Characterization of crystallization processes with video imaging
… products. Despite its widespread use, in the fine chemicals, pharmaceutical and food industries, crystallization still has many unknowns which can affect the purity, quality and quantity of the crystals produced. As a result, monitoring crystallization processes in order to better understand …
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The synthesis, characterization and catalytic applications of mesocellular silica foams
… with narrow pore size distributions and well-defined pore structures in the size range of 100 - 500 A. Materials with pores of 100 - 500 A possess a potential combination of high surface areas and pore sizes accommodating of large molecules that could make them of great use in the catalysis and …
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Developing sustainable catalytic methods
… are essential to our way of life. From commodity chemicals to fine chemicals, pharmaceuticals to agrochemicals, these are products that we cannot do without. The energy demands of the chemical sector are also enormous and given that most of this energy still comes from fossil fuels, the …
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Development of O,N-bidentate ruthenium catalysts for isomerization and kinetic studies of ruthenium carbenes for C=C coupling reactions
… way of homogeneous catalysis in producing bulk, fine chemicals, and even natural products. During the last decade, ruthenium catalysts have provided new indispensable synthetic methods that cannot be promoted by other catalysts and applied in wide range of chemical reactions. This work deals with …
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Utilizing viruses to probe the material process - structure - property relationship : controlling catalytic properties via protein engineering and nanoscale synthesis
From the fabrication of fine chemicals, to the increasing attainability of a non-petrochemical based energy infrastructure, catalysts play an important role in meeting the increasing energy and consumable demands of today without compromising the global health of tomorrow. Development of these …
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DEVELOPMENT OF FLOW PROCESSES FOR THE EFFICIENT AND SUSTAINABLE PREPARATION OF HIGH VALUE CHEMICALS
… friendly approaches to the synthesis of fine chemicals and active pharmaceutical ingredients (APIs). This doctoral research aimed to develop sustainable and efficient continuous flow protocols for the synthesis of high-value compounds, in line with the principles of green chemistry and …
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Synthesis and Application of Air-Stable Secondary Phosphine Oxide, Oxime, and Amine-Phosphine Palladium(II) Complexes in Transfer Hydrogenation and Cross-Coupling Reactions
… particularly attractive for the production of fine chemicals, pharmaceuticals, and natural products. Ligand design is critical for the development of homogeneous catalysts. For late-transition-metal-catalyzed cross-coupling reactions that rely on C-X or C-H oxidative addition, strongly …
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