National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Catalytic Enantioselective Desymmetrization of meso-Epoxides
Malatinec, Štefan ; Kotora, Martin (advisor) ; Baszczyňski, Ondřej (referee)
Catalytic enantioselective desymmetrization of meso-epoxides is widely used in many areas of chemistry. Such process is usually catalyzed by a transition metal complex with a chiral ligand. Recently, a synthesis of an analogue of Bolm's 2,2'-bipyridine ligand was developed and its combination with metal salts were tested in various reactions. In this master's thesis, a catalytic system composed of Sc(OTf)3/Bolm's ligand analogue was studied in alcoholysis and aminolysis of the meso- epoxides. The reaction has been extended to a broad range of alcohols providing 1,2-diol monoethers in excellent enantioselectivity up to 99% ee. The aminolysis of meso-epoxides has been optimized, as well. The catalyst loading could be lowered to 1 mol% with only marginal effects on the enantioselectivity. Key words: epoxides, enantioselective catalysis, chiral ligands.
Application of a Bolm ligand analog in catalysis
Malatinec, Štefan ; Kotora, Martin (advisor) ; Matoušová, Eliška (referee)
Bolm`s ligand belongs to the group of 2,2'-bipyridines, which represents a class of C2 symmetric ligands. These ligands form complexes with Lewis acids, which could be used in asymmetric catalysis, for example in the ring-opening of epoxides. Bolm`s ligand analogue was prepared and the enantioselectivity of the ring-opening reaction of cis-stilben oxide with aniline and variety of substituted benzyl alcohols catalyzed by scandium(III) triflate was studied as a part of this bachelor thesis. The enantioselectivity of the reaction using Bolm's ligand analogue was compared to that of Bolm`s ligand. Key words: synthesis, catalysis, bipyridines

Interested in being notified about new results for this query?
Subscribe to the RSS feed.