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Verification of flavinium salts reactivity with N- and O-nucleophiles for eventual transformation of boronic acids to corresponding amines
Honskusová, Linda ; Kotoučová, Hana (advisor) ; Holakovský, Roman (referee)
Presented diploma thesis follows the long-term study running at the Department of Organic Chemistry at the University of Chemistry and Technology Prague in the field of using flavinium salts as catalysts of oxidation reactions. The aim was to verify the reactivity of flavinium salt 13 with different types of O- and N-nucleophiles by monitoring of the corresponding C4a-adducts formation. In the thesis a simple alloxazinium salt 13 and one of the nucleophiles (hydroxylamine 25) were prepared. According to the results obtained from the UV-VIS measurements nucleophile 25 is the only one of the newly tested wchich formed desired C4a-adduct 13d with alloxazinium salt 13. KEYWORDS flavinium salt, nucleophile, C4a-adduct, organocatalysis, IBSE
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Verification of flavinium salts reactivity with N- and O-nucleophiles for eventual transformation of boronic acids to corresponding amines
Honskusová, Linda ; Kotoučová, Hana (advisor) ; Holakovský, Roman (referee)
Presented diploma thesis follows the long-term study running at the Department of Organic Chemistry at the University of Chemistry and Technology Prague in the field of using flavinium salts as catalysts of oxidation reactions. The aim was to verify the reactivity of flavinium salt 13 with different types of O- and N-nucleophiles by monitoring of the corresponding C4a-adducts formation. In the thesis a simple alloxazinium salt 13 and one of the nucleophiles (hydroxylamine 25) were prepared. According to the results obtained from the UV-VIS measurements nucleophile 25 is the only one of the newly tested wchich formed desired C4a-adduct 13d with alloxazinium salt 13. KEYWORDS flavinium salt, nucleophile, C4a-adduct, organocatalysis, IBSE
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HPLC and the Possibility of its Use in Teacher Education
Gabriel, Štěpán ; Kotoučová, Hana (advisor) ; Holakovský, Roman (referee)
This diploma thesis is focused on theoretical and practical aspects of High performance liquid chromatography (HPLC). This method is introduced as one of the most frequently used current analytical methods. The theoretical part of thesis is focused on instrumentation of HPLC and particular components of HPLC analytical system. The most often used mobile phases and static phases are described as well. Based on these theoretical aspects, laboratory exercise using HPLC for future teachers is designed. Caffeine is used as ideal model material for this exercise. Caffeine is well-known substance, because of its traditional usage for example in food-processing industry. Final part of this thesis is brief view on framework educational programmes for primary and secondary education. As appendix of this thesis, manual for referenced laboratory exercise is provided. KEYWORDS chromatography, caffeine, HPLC, instrumentation of HPLC, teacher training, RVP
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Flavinium Salts Usage as Catalysts of Oxidation Reactions
Strnadová, Iveta ; Kotoučová, Hana (advisor) ; Holakovský, Roman (referee)
Usage of Flavinium Salts as Catalysts of Oxidation Reactions Summary This diploma thesis deals with use of flavinium salts as a catalysts of oxidation reactions. 3,7,8,10-tetramethylisoalloxazin 25, 5-ethyl-3,7,8,10-tetramethylisoalloxazinium perchlorate 16 and 5-ethyl-1,3-dimethylalloxazinium perchlorate 26 had been prepared. Salts 16, 26 and other previously prepared phlavinium salt 28 were tested as potential catalysts for the oxidation of phenylboronic acids to the corresponding phenols, and especially for the use of oxygen as the oxidizing agent. The best solvent systems were found through testing and followed possible influence of the substituent on the phenyl ring of boronic acid was investigated. This initial screening can be used as a basis for further and more detailed testing of catalytic efficiency of flavinium salts and to study the oxidation mechanism.
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