Search for dissertations about: "substitution"

Showing result 6 - 10 of 735 swedish dissertations containing the word substitution.

  2. 6. Direct Catalytic Nucleophilic Substitution of Non-Derivatized Alcohols

    Author : Anon Bunrit; Joseph Samec; Joseph Moran; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nucleophilic substitution; catalysis; alcohols; stereospecific; Lewis acid; Brønsted acid base; bifunctional; heterocycles; organisk kemi; Organic Chemistry;

    Abstract : This thesis focuses on the development of methods for the activation of the hydroxyl group in non-derivatized alcohols in substitution reactions. The thesis is divided into two parts, describing three different catalytic systems. READ MORE

  4. 7. Copper-Mediated Vicarious Nucleophilic Substitution

    Author : Olof Haglund; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis suggests and examines a novel approach for copper-mediated cross-couplings. We call this mechanistic approach copper-mediated vicarious nucleophilic substitution. Our hypothesis is that copper-promoted cross-couplings proceed via an intermediate s-adduct, a Meisenheimer adduct. READ MORE

  5. 8. Chemicals in consumer products : Towards a safe and sustainable use

    Author : Linda Molander; Christina Rudén; Sven Ove Hansson; Mattias Öberg; KTH; []
    Keywords : consumer products; articles; hazardous chemicals; risk management; chemicals regulation; REACH; substitution; regulatory toxicology; European Union;

    Abstract : Health and environmental risks associated with emissions of hazardous chemicals from articles, including everyday consumer products such as clothes and toys, have become widely acknowledged internationally, particularly in the EU. This thesis contributes to new understandings of how these risks are currently managed within the EU and recommends actions for ensuring a safe and sustainable use of chemicals in articles. READ MORE

  6. 9. Welfare Relationships : Voluntary organisations and local authorities supporting relatives of older people in Sweden

    Author : Lena Dahlberg; Rune Premfors; Tommy Möller; Staffan Johansson; Stockholms universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; substitution; complementarity; welfare pluralism; voluntary organisation; welfare state; informal care; older people; Sweden; Political science; Statsvetenskap;

    Abstract : Sweden is often described as a country with a strong welfare state and little voluntary work. This is as would be expected according to substitution theory, in which extensive welfare systems are assumed to crowd out voluntary activity and thereby limit the potential for voluntary work – there is an inverse relationship between voluntary and statutory activity. READ MORE

  7. 10. Synthesis and Characterization of New Inorganic Thermoelectric Materials

    Author : Daniel Cederkrantz; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; thermal conductivity.; Ba8Ga16Ge30; Seebeck coefficient; nanoinclusions; Thermoelectricity; waste heat recovery; clathrates; thermal stability; electrical resistance; Mg2Si; substitution; semiconductors;

    Abstract : With thermoelectric materials it is possible to convert a difference in temperature into electrical energy. This can be utilized for a more efficient use of available energy, eg. by converting waste heat from a combustion process. READ MORE