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Preparation of titanocene complexes with cytostatic properties
Dunlop, David ; Lamač, Martin (advisor) ; Demel, Jan (referee)
Cytotoxicity of titanocene dihalides has been a persistent topic in scientific literature, dating back to the 1970's. The intensively studied titanocene dichloride, which has disappointed in phase II clinical trials on humans, has been substituted by various titanocenes, which bear aryl-substituted cyclopentadienyl ligands. The activity of these complexes can be interestingly further improved via substitution of chloride ligands by fluorides. However, the mechanism of action of these complexes remains somewhat of a mystery, starting with their transport into the cells, stability under physiological conditions, etc. This thesis describes the preparation of several variously substituted titanocene dichlorides and difluorides. These complexes are a part of a larger series, which will help to further the understanding of structural effects on the cytotoxicity of titanocenes. All prepared complexes are characterized via 1 H ,13 C NMR and IR spectroscopy. Complexes containing fluoride ligands have also been characterized via 19 F NMR spectroscopy, melting points, RTG structural analysis (if monocrystals were available) and elemental analysis. Keywords: titanocene dihalides, organometallics, cytotoxicity, cancer cells
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Development of new pathways for syntheses of sesquiterpenoids
Topolovčan, Nikola ; Kotora, Martin (advisor) ; Dvořák, Dalimil (referee) ; Pour, Milan (referee)
This work consists of four consecutive parts, each dealing with syntheses of structurally diverse compounds. The syntheses were based on the methods within the domain of transition-metal catalyzed and/or mediated reactions with particular emaphasis on the application of organozirconium chemistry. 1. A method for synthesis of tricyclic condensed hydrocarbons possessing 5(6)-7-6(aryl) framework was developed. It is based on reaction of bicyclic zirconacyclopentenes, prepared by oxidative dimerization of enynes on a low-valent zirconocene species (Negishi's reagent), with ortho-halobenzaldehydes in the presence of various additives. The presence of two different centers of reactivity - the sp2 C-Zr and sp3 C-Zr bond - allowed sequential functionalization of each bond. Thanks to its higher nucleophilicity, the sp3 C-Zr bond reacted preferentially with the carbonyl carbon of the aldehyde yielding an oxazirconacycloheptene. The subsequent transmetallation of the remaining sp2 C-Zr bond with CuCl in the presence of other additives (catalysts) enabled an intramolecular cross-coupling reaction with the aryl halide moiety furnishing the desired tricyclic products in reasonable yields. The scope of the reaction with respect to differently functionalized reactants was assessed, as well as its mechanistic...
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Utilization of mass spectrometry for analysis of biologically active compounds
Kaliba, David
This PhD thesis provides a commented set of four publications. These publications are focused on capillary electrophoresis, liquid chromatography, and UV/Vis spectrometry used to study complexes of rhenium with aromatic ligands. The methods of mass spectrometry with soft ionization techniques, 1 H and 13 C nuclear magnetic resonance, and infrared spectrometry were used for structural characterization of the individual complexes. The complexes were synthetized in reactions of the rhenium precursor tetrabutylammonium tetrachlorooxorhenate with the corresponding ligand under both aerobic and anaerobic conditions. In the course of the research, it was revealed that the prepared complexes (with Re in the oxidation number +V and +VI) are unstable and their oxidation numbers change to another more stable form (Re+VII ). Sub-projects which were successfully implemented during the research were as follows: Design and successful realization of the process of synthesis of selected rhenium complexes with aromatic ligands 1,2-dihydroxybenzene, 1,2,3-trihydroxybenzene, and 2,3-dihydroxynaphthalene in reactions with and without air access, and their structural characterization by ESI-MS, APPI- MS, LDI-MS, ESI-MS/MS, NMR, and IR. ESI-MS SRM and UV/Vis time studies of the behaviour of primary rhenium complexes...
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Preparation of titanocene complexes with cytostatic properties
Dunlop, David ; Lamač, Martin (advisor) ; Demel, Jan (referee)
Cytotoxicity of titanocene dihalides has been a persistent topic in scientific literature, dating back to the 1970's. The intensively studied titanocene dichloride, which has disappointed in phase II clinical trials on humans, has been substituted by various titanocenes, which bear aryl-substituted cyclopentadienyl ligands. The activity of these complexes can be interestingly further improved via substitution of chloride ligands by fluorides. However, the mechanism of action of these complexes remains somewhat of a mystery, starting with their transport into the cells, stability under physiological conditions, etc. This thesis describes the preparation of several variously substituted titanocene dichlorides and difluorides. These complexes are a part of a larger series, which will help to further the understanding of structural effects on the cytotoxicity of titanocenes. All prepared complexes are characterized via 1 H ,13 C NMR and IR spectroscopy. Complexes containing fluoride ligands have also been characterized via 19 F NMR spectroscopy, melting points, RTG structural analysis (if monocrystals were available) and elemental analysis. Keywords: titanocene dihalides, organometallics, cytotoxicity, cancer cells
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Utilization of mass spectrometry for analysis of biologically active compounds
Kaliba, David
This PhD thesis provides a commented set of four publications. These publications are focused on capillary electrophoresis, liquid chromatography, and UV/Vis spectrometry used to study complexes of rhenium with aromatic ligands. The methods of mass spectrometry with soft ionization techniques, 1 H and 13 C nuclear magnetic resonance, and infrared spectrometry were used for structural characterization of the individual complexes. The complexes were synthetized in reactions of the rhenium precursor tetrabutylammonium tetrachlorooxorhenate with the corresponding ligand under both aerobic and anaerobic conditions. In the course of the research, it was revealed that the prepared complexes (with Re in the oxidation number +V and +VI) are unstable and their oxidation numbers change to another more stable form (Re+VII ). Sub-projects which were successfully implemented during the research were as follows: Design and successful realization of the process of synthesis of selected rhenium complexes with aromatic ligands 1,2-dihydroxybenzene, 1,2,3-trihydroxybenzene, and 2,3-dihydroxynaphthalene in reactions with and without air access, and their structural characterization by ESI-MS, APPI- MS, LDI-MS, ESI-MS/MS, NMR, and IR. ESI-MS SRM and UV/Vis time studies of the behaviour of primary rhenium complexes...
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Utilization of mass spectrometry for analysis of biologically active compounds
Kaliba, David ; Jelínek, Ivan (advisor) ; Pacáková, Věra (referee) ; Smrček, Stanislav (referee)
This PhD thesis provides a commented set of four publications. These publications are focused on capillary electrophoresis, liquid chromatography, and UV/Vis spectrometry used to study complexes of rhenium with aromatic ligands. The methods of mass spectrometry with soft ionization techniques, 1 H and 13 C nuclear magnetic resonance, and infrared spectrometry were used for structural characterization of the individual complexes. The complexes were synthetized in reactions of the rhenium precursor tetrabutylammonium tetrachlorooxorhenate with the corresponding ligand under both aerobic and anaerobic conditions. In the course of the research, it was revealed that the prepared complexes (with Re in the oxidation number +V and +VI) are unstable and their oxidation numbers change to another more stable form (Re+VII ). Sub-projects which were successfully implemented during the research were as follows: Design and successful realization of the process of synthesis of selected rhenium complexes with aromatic ligands 1,2-dihydroxybenzene, 1,2,3-trihydroxybenzene, and 2,3-dihydroxynaphthalene in reactions with and without air access, and their structural characterization by ESI-MS, APPI- MS, LDI-MS, ESI-MS/MS, NMR, and IR. ESI-MS SRM and UV/Vis time studies of the behaviour of primary rhenium complexes...
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Development of new pathways for syntheses of sesquiterpenoids
Topolovčan, Nikola ; Kotora, Martin (advisor) ; Dvořák, Dalimil (referee) ; Pour, Milan (referee)
This work consists of four consecutive parts, each dealing with syntheses of structurally diverse compounds. The syntheses were based on the methods within the domain of transition-metal catalyzed and/or mediated reactions with particular emaphasis on the application of organozirconium chemistry. 1. A method for synthesis of tricyclic condensed hydrocarbons possessing 5(6)-7-6(aryl) framework was developed. It is based on reaction of bicyclic zirconacyclopentenes, prepared by oxidative dimerization of enynes on a low-valent zirconocene species (Negishi's reagent), with ortho-halobenzaldehydes in the presence of various additives. The presence of two different centers of reactivity - the sp2 C-Zr and sp3 C-Zr bond - allowed sequential functionalization of each bond. Thanks to its higher nucleophilicity, the sp3 C-Zr bond reacted preferentially with the carbonyl carbon of the aldehyde yielding an oxazirconacycloheptene. The subsequent transmetallation of the remaining sp2 C-Zr bond with CuCl in the presence of other additives (catalysts) enabled an intramolecular cross-coupling reaction with the aryl halide moiety furnishing the desired tricyclic products in reasonable yields. The scope of the reaction with respect to differently functionalized reactants was assessed, as well as its mechanistic...
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Organometallic Compounds in Chemistry Education
Houser, František ; Klímová, Helena (advisor) ; Svoboda, Lubomír (referee) ; Kolář, Karel (referee)
The thesis is devoted to organometallic chemistry teaching problematics at Czech secondary schools. In this thesis it is analyzed what space in the schooling is given this theme by educational programs. Furthermore, the thesis are in terms of the theme of organometallic compounds analyzed secondary school textbooks commonly used chemical education, and there is estimated interest of teachers for the newly prepared materials on this topic as well. As a reaction to the conclusions of the analyzes was prepared explanatory text on the topic of organometallic compounds intended for teachers who can use it for their own learning and to prepare their lessons as well. The second main output of this work is a set of test tasks relating to the created explanatory text of organometallic compounds. These questions are not only intended for testing mastering the topic of organometallic compounds by pupils, but also serves as an mastery-level proposal of the topic that students especially in grammar schools and secondary vocational schools should achieve. Explanatory text and a set of test tasks were verified by teachers teaching chemistry through direct interview method and then there were incorporated comments emerged in the interviews into them. Powered by TCPDF (www.tcpdf.org)
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