Sökning: "Helena Lundberg"

Hittade 5 avhandlingar innehållade orden Helena Lundberg.

  1. 1. Amidst the green Metal-catalyzed amide formation from carboxylic acids

    Författare :Helena Lundberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis describes novel methods for transition metal-catalyzed transformation of non-activated carboxylic acids to amides. It was found that 2-10 mol% of zirconium(IV) chloride or 10-20 mol% titanium(IV) isopropoxide catalyzed the formation of a range of secondary and tertiary amides in good to excellent yields (61-99%) in THF at 70-100°C, with molecular sieves present as water scavengers. LÄS MER

  3. 2. Group (IV) Metal-Catalyzed Direct Amidation : Synthesis and Mechanistic Considerations

    Författare :Helena Lundberg; Adolfsson Hans; Tom Sheppard; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; catalysis; amide; carboxylic acid; amino acid; titanium; zirconium; hafnium; organisk kemi; Organic Chemistry;

    Sammanfattning : The amide unit constitutes the backbone of proteins, and it is present in a large number of pharmaceutically active molecules, polymeric materials such as nylon and Kevlar, as well as in food additives like aspartame. Amides are produced in enormous amounts every year, thus, environmentally friendly and selective methods for their formation are of great importance. LÄS MER

  4. 3. Strävan efter värdighet : En studie av servicearbete

    Författare :Helena Lundberg; Henrietta Huzell; Patrik Larsson; Ylva Ulfsdotter Eriksson; Karlstads universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Dignity; service work; professional status; Värdighet; servicearbete; yrkesstatus; Working Life Science; Arbetsvetenskap;

    Sammanfattning : The focus of this study is dignity in low status service work. Using labels such as bad jobs, McJobs and dirty work, these jobs have been described as low-skilled, low-paid, monotonous and physically demanding with lack of voice and no job security. LÄS MER

  5. 4. "Pre- versus Post Birth Parental Influences in the Formation of Health: Lessons from a Large Sample of Adoptees" and "Birth Order and Child Health"

    Författare :Evelina Lundberg; Helena Svaleryd; Anders Forslund; Robert Östling; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi;

    Sammanfattning : .... LÄS MER

  7. 5. Essays on Income Taxation and Wealth Inequality

    Författare :Jacob Lundberg; Håkan Selin; Spencer Bastani; Helena Svaleryd; Tomas Sjögren; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; public economics; income taxation; wealth inequality; Laffer curve; redistribution; microsimulation; Economics; Nationalekonomi;

    Sammanfattning : This thesis is concerned with inequality, redistribution and taxation, in particular the taxation of labour income and the distribution of wealth. Most of the analysis is focused on Sweden. The thesis consists of four self-contained essays.Essay 1: “Analyzing tax reforms using the Swedish Labour Income Microsimulation Model”. LÄS MER