Universitat de Girona
Now showing items 90-109 of 141
L'activació d'oxigen que té lloc en els éssers vius constitueix una font d'inspiració pel desenvolupament d'alternatives als oxidants tradicionals, considerats altament tòxics i nocius. En aquesta treball s'utilitzen ...
The production of engineered nanomaterials (ENMs) has grown in last years due to their special physicochemical properties in respect to their bulk counterparts, derived from their small size (1-100 nm). Among the existing ...
Structural isomers are molecules that have the same number and type of atoms but arranged in different manner. The isomerization energy is the energy difference between two isomers, i.e. the energy cost corresponding to ...
The oxidation of aliphatic C-H bonds is a very powerful reaction because it allows the functionalization of inert C-H bonds, converting them into a suitable sites for further chemical elaboration. It also represents one ...
Nowadays, the search for new drugs against cancer is one of the major goals to improve the quality of life of patients. The development of more selective treatments against cancer cells may lead to a significant reduction ...
En aquesta tesi doctoral es va estudiar la preparació de pèptids biarílics en fase sòlida. En primer lloc, es varen borilar residus de fenilalanina o tirosina presents a la seqüència peptídica a través d’una reacció de ...
Apart from the geological controls that can cause As mobilization in groundwater in the Bengal Delta Plain, local anthropogenic factors may also contribute to some extent. Investigations showed that As(III) get enriched ...
Aquesta tesi doctoral es basa en l'estudi de l'aplicació en catàlisi de dos tipus de complexos organometallics basats en dos metalls de tansició diferents. Concretament s'estudien complexos macrocíclics triolefínics de ...
Metalloenzymes are a fundamental source of inspiration for synthetic chemists. Oxidation metalloenzymes catalyze oxidation reactions with high efficiency under very mild experimental conditions exhibiting exquisite regio- ...
The development of new chemical processes and efficient catalysts for the formation of carbon-carbon bonds is an important topic in organic chemistry. In particular, the [2+2+2] cycloaddition reaction involving different ...
Organometallic aryl-CuIII species have been proposed as key intermediates in Ullmann-type reactions. However, such species have long remained elusive and mechanistic investigations of a plausible catalytic cycle remained ...
The physical and chemical properties of fullerenes and nanotubes can be conveniently tuned by the attachment of different functional groups to them. Therefore, the systematic understanding of different problems such as ...
This thesis is focused on the unexplored field of organometallic copper(III) chemistry. Arylcopper(III) complexes have been proposed as key intermediates in Ullmann condensation reactions that consist in the coupling of ...
In this thesis, we focused on the alternative methodologies that are based on the reconstruction of density matrices. While in DFT several benchmarks can be found in the literature, for the rest of alternative methodologies ...
The low efficiency of wastewater treatment plants to achieve the complete removal of micropollutants, including pharmaceuticals, has motivated the development of alternative water technologies to improve their efficiency, ...
The [2+2+2] cycloaddition reaction involves the formation of three carbon-carbon bonds in one single step using alkynes, alkenes, nitriles, carbonyls and other unsaturated reagents as reactants. This is one of the most ...
Transition metal-catalysed [2+2+2] cycloaddition reactions involving unsaturated substrates represent one of the most elegant methods in organic chemistry to prepare functionalised cyclic compound. This doctoral thesis is ...
The development of novel catalytic methodologies involving the formation of carbon – carbon/heteroatom bonds to produce cyclic systems constitutes a field of great interest in the modern synthetic organic chemistry. Over ...
Selenium (Se) is an element with important health implications that is emitted in significant amounts from volcanoes. Attracted by the fertility of volcanic soils, around 10% of the world population lives within 100 km of ...
Des del seu descobriment, a la molècula C60 se li coneixen una varietat de derivats segons el tipus de funcionalització amb propietats fisicoquímiques específiques de gran interès científic. Una sel·lecció de derivats ...
