Search for dissertations about: "process substitution"

Showing result 11 - 15 of 146 swedish dissertations containing the words process substitution.

  2. 11. Asymmetric Synthesis and Mechanistic Studies on Copper(I)-Catalyzed Substitution of Allylic Substrates

    Author : Jakob Norinder; Jan-Erling Bäckvall; Norbert Krause; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; copper; allylic substitution; ferrocene; DYKAT; cross-coupling; homo-coupling; DFT; Organic chemistry; Organisk kemi;

    Abstract : This thesis deals with the copper-catalyzed substitution of allylic substrates.In the first part of this thesis, the synthesis of a series of metallocenethiolates is described. The thiolates were examined as ligands in the enantioselective copper(I)-catalyzed γ-substitution of allylic acetates. READ MORE

  4. 12. Quantum Chemical Studies of Aromatic Substitution Reactions

    Author : Magnus Liljenberg; Tore Brinck; Leif Eriksson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

    Abstract : In this thesis, density functional theory (DFT) is used to investigate the mechanisms and reactivities of electrophilic and nucleophilic aromatic substitution reactions (SEAr and SNAr respectively). For SEAr, the σ-complex intermediate is preceded by one (halogenation) or two (nitration) π-complex intermediates. READ MORE

  5. 13. Development of Palladium-Catalyzed Transformations Involving η1-Allypalladium Species

    Author : Niclas Solin; Kálmán Szabó; Antonio M. Echavarren; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Palladium; Homogenous catalysis; Allylation; Electrophilic substitution; Density functional calculations; Organic chemistry; Organisk kemi;

    Abstract : This thesis is focused on investigation of the structure, reactivity and isomerization reactions of η1-allylpalladium complexes, which are key intermediates in catalytic transformations. The first part of this thesis concerns the structure and reactivity of bis-allylpalladium complexes. READ MORE

  6. 14. Sensorimotor transformations during grasping movements

    Author : Daniel Säfström; Benoni B. Edin; Melvyn A. Goodale; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; sensorimotor transformation; sensory integration; visuomotor map; human physiology; adaptation; grasping; sensory substitution; Physiology; Fysiologi;

    Abstract : ‘Sensorimotor transformations’ are processes whereby sensory information is used to generate motor commands. One example is the ‘visuomotor map’ that transforms visual information about objects to motor commands that activates various muscles during grasping movements. READ MORE

  7. 15. Livestock, feed production and land use – an environmental assessment

    Author : Yaw Sasu-Boakye; Chalmers tekniska högskola; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; partial equilibrium modelling; land use impacts; livestock production; soya beans; life cycle assessments; ecosystem services; protein feeds; feed substitution;

    Abstract : The use of land for agriculture contributes substantially to today’s global environmental challenges such as climate change, water and land degradation and biodiversity loss. Today, about 38% of the ice-free land surface on earth is used as agricultural land, with about 75% of agricultural land used to produce feed for livestock. READ MORE