Sökning: "13C"

Visar resultat 11 - 15 av 166 avhandlingar innehållade ordet 13C.

  1. 11. Addition of organocuprates to enoates : a mechanistic and synthetic study

    Författare :Beritte Christenson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 13C labelled; TMSX; NMR spectroscopy; diastereoselectivity; solvent effects; pi-complex; enoates; lithium diorganocuprates; conjugate addition;

    Sammanfattning : .... LÄS MER

  3. 12. Structure and mechanism on the C9H9+ and C9H9- potential energy surfaces : charge control of degenerate rearrangements and homoaromatic delocalization studied by multiple labelling with 13C and 2H, 13C NMR methods and ab initio MO calculations

    Författare :Göran Jonsäll; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 13. Investigations of cellulose polymorphs by 13C-CP/MAS-NMR spectroscopy and chemometrics

    Författare :Helena Lennholm; Tommy Iversen; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 14. Dipolar recoupling sequences in 13C and 31P nuclear magnetic resonance studies of mineral surfaces

    Författare :Dan Sandström; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : Solid state magic angle spinning (MAS) 31P nuclear magnetic resonance (NMR) experiments, both cross polarization (CP) and dipole-dipole recoupling, were used as tools in the investigation of the reaction products at the surface of synthetic galena (PbS) mineral and O,O'-dialkyldithiophosphate potassium salts. Various dipole-dipole recoupling sequences have been tested on powder glycine-13C2 NMR and a polycrystalline powder sample of O,O'-diethyldithiophosphate2-Ni(II) to find one or several sequences suitable for the surface experiments. LÄS MER

  7. 15. NMR Studies of Inclusion Compounds

    Författare :Sahar Nikkhou Aski; Jozef Kowalewski; Pierre Mutzenhardt; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NMR; 13C spin relaxation; PFGNMR; Kinetics; Correlation time; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : This thesis presents the application of some of the NMR methods in studying host-guest complexes, mainly in solution. The general focus of the work is on investigating the reorientational dynamics of some small molecules that are bound inside cavities of larger moieties. LÄS MER