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  • 1.
    Andersson, Pher
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Harden, Adrian
    Tanner, David
    Norrby, Per-Ola
    Studies of Allylic Substitution Catalysed by a Palladium Complex of a C2-Symmetric Bis(aziridine): Preparation and NMR Spectroscopic Investigation of a Chiral n-Allyl Species1995In: Chem. Eur. J., no 1, p. 12-16Article in journal (Refereed)
  • 2.
    Andersson, Pher
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Schab, Szymon
    Mechanism of the Palladium-Catalyzed Elimination of Acetic Acid from Allylic Acetates1995In: Organometallics, Vol. 14, no 1, p. 1-Article in journal (Refereed)
  • 3.
    Andersson, Örjan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Two Modified 2,3-Diamino-naphthalenes for Spectro-fluorimetric Determination of Selenium in Biological Samples1995Licentiate thesis, monograph (Other academic)
  • 4. AUNE, M
    et al.
    BERGSON, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    MATSSON, O
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    1,3-HYDRON TRANSFER IN SOME 5-SUBSTITUTED AND 7-SUBSTITUTED 1-METHYLINDENES - ENANTIOSELECTIVITIES AND ENANTIOMER-DEPENDENT KINETIC ISOTOPE EFFECTS1995In: JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, ISSN 0894-3230, Vol. 8, no 6, p. 400-406Article in journal (Refereed)
    Abstract [en]

    Base-catalysed substrate-enantioselective 1,3-hydron transfer (kinetic resolution) was studied in the indene system. A series of 1-methylindenes substituted in the aromatic ring [5-methoxy- (2), 5-fluoro- (3), 5-nitro- (4) and 7-nitro (5)] and 1-methylindene (1) were employed as substrates. The rate constants, the enantioselectivities and the kinetic isotope effects (KIEs) for the enantioselective reactions [(k(H)/k(D))(+) and (k(H)/k(D))(-)] were determined at 20 degrees C using (+)-(8R, 9S)-dihydroquinidine as chiral catalyst in the solvent o-dichlorobenzene. The rate constants vary according to the electronic effects of the substituents, The primary deuterium KIE, ranging from 4 . 73 [for (+)-(S)-2] to 11 . 3 [for (-)-(R)-5], is correlated with the rate constants as expected on the basis of the Melander-Westheimer postulate, The introduction of a substituent in the aromatic ring decreases the enantioselectivity, All compounds except 5 show the same sense of the enantioselectivity [k(+)/k(-)>1; all substrates used are (+)-(S)/(-)-(R)], The enantiomer dependence of the KIE is most pronounced for 1 [(k(H)/k(D))(+) = 5 . 71 and (k(H)/k(D))(-) = 6 . 46] and vanishes for the most acidic substrates (4 and 5).

  • 5.
    Aune, Marie
    et al.
    Uppsala University.
    Gogoll, Adolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Matsson, Olle
    Uppsala University.
    Solvent Dependence of Enantioselectivity for a Base Catalyzed 1,3-Hydron Transfer Reaction: A Kinetic Isotope Effect and NMR Spectroscopic Study.1995In: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, Vol. 60, no 5, p. 1356-1364p. 1356-1364Article in journal (Refereed)
    Abstract [en]

    The base-catalyzed rearrangement of 1-methylindene (1) to 3-methylindene (2) has been studied. The reaction proceeds with substrate enantioselectivity (kinetic resolution) when chiral tertiary amines are used as catalysts. When dihydroquinidine (DHQD) (3

  • 6. BAKKER, ALBERT
    et al.
    GEJJI, SHRIDHAR
    LINDGREN, JAN
    HERMANSSON, KERSTI
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    PROBST, MICHAEL M
    CONTACT ION-PAIR FORMATION AND ETHER OXYGEN COORDINATION IN THE POLYMER ELECTROLYTES M[N(CF3SO2)(2)](2)PEO(N) FOR M=MG, CA, SR AND BA1995In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 36, no 23, p. 4371-4378Article in journal (Refereed)
    Abstract [en]

    The polymer electrolytes M[N(CF3SO2)(2)](2)PEO(n) for M = Mg, Ca, Sr and Ba have been investigated using infra-red spectroscopy, differential scanning calorimetry and impedance spectroscopy. The effects of varying concentration (n = 6-40) and temperature (25-95 degrees C) on the contact ion pair formation and cation coordination have been studied. Contact ion pairs are only found for the most concentrated samples (n < 9). Ion pairs occur with two types of structures: one type is found far samples containing Mg2+ and the other for samples with Ca2+, Sr2+ and Ba2+. The conductivities of the samples are discussed in terms of radii and coordination numbers of the cations.

  • 7.
    BERGER, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    TERGENIUS, LE
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    NOREN, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    ERIKSSON, L
    THE CRYSTAL STRUCTURE OF ROOM-TEMPERATURE SYNTHESIZED ORTHORHOMBIC TLCU4SE3 FROM DIRECT-METHODS ON X-RAY-POWDER DATA1995In: J Alloys Comp, Vol. 224, p. 171-176Article in journal (Refereed)
    Abstract [en]

    An orthorhombic modification of TlCu4Se3 was synthesised at room temperature by oxidative copper extraction from TlCu5Se3. It crystallises in a new structure type, space group Pnnm, with the cell parameters a = 12.4306(2) Angstrom, b = 12.7997(2) Angstrom, c= 3.93516(6) Angstrom. The structure is closely related to the tetragonal structure of the parent compound.

  • 8.
    BERGER, RA
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    ON THE SYMMETRY OF LICUO21995In: J Solid State Chem, Vol. 114, p. 590-591Article in journal (Refereed)
    Abstract [en]

    Utsumi et al., J. Solid State Chem. 107, 507, 1993, claim that LiCuO2 transforms from an orthorhombic modification to a monoclinic one by applying pressure. This interpretation is disputed on the basis of evidence from X-ray and neutron diffraction refinements which show that LiCuO2 is already monoclinic (NaCuO2 structure type) at ambient pressure.

  • 9.
    BUCUR, RV
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    BERGER, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    ELECTROCHEMICAL POTENTIOMETRIC DETERMINATION OF THE DIFFUSION-COEFFICIENT OF COPPER IN LOW DIGENITE, A COPPER SULFIDE1995In: Solid State IonicsArticle in journal (Refereed)
    Abstract [en]

    The diffusion of copper in ''low digenite'', Cu1.8S, has been measured by an electrochemical potentiometric method within the temperature range 15-50 degrees C. At 25 degrees C the chemical diffusion coefficient ($) over tilde D is 1.8(1) x 10(-8) cm(2)/

  • 10.
    Carlsson, Annika
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Spectroscopy and Pattern Recognition as Alternative Methods to Biological Assays1995Licentiate thesis, monograph (Other academic)
  • 11.
    Hellberg, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Kemisk och Funktionell Karaktärisering av Vätske-kromatografimedia för Proteinrening1995Licentiate thesis, monograph (Other academic)
  • 12.
    HERMANSSON, KERSTI
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    O-H BONDS IN ELECTRIC-FIELDS - ELECTRON-DENSITIES AND VIBRATIONAL FREQUENCY-SHIFTS1995In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 233, no 4, p. 376-382Article in journal (Refereed)
    Abstract [en]

    The changes in the electron density distribution caused by varying the O-H bond length for HDO and OH- in uniform electric fields are investigated and related to the frequency shifts for the uncoupled O-H stretching vibration. Numerical integration of difference density maps, Delta rho=rho(r(OH)+Delta r(OH))-rho(r(OH)), reproduces the electronic contribution to theta mu(parallel to)(total)/theta r(OH), if the integration is carried out to a distance of approximate to 3.5 Angstrom from the O atom. The frequency shift Delta nu, is proportional to -E(parallel to) X[d mu(parallel to)(permanent)(r(OH))/dr(OH)]-1/2E(parallel to)[theta mu(parallel to)(induced)(E(parallel to), r(OH))/theta r(OH)] and electron density maps corresponding to the electronic parts of these terms are presented. Experimentally it has been found that the OH- ion shows a frequency upshift when bound in a moderately strong field, while water molecules show a downshift. The electron density maps show why d mu(parallel to)(permanent)(r(OH))/dr(OH) is positive for HDO and negative for OH-, resulting in a downshift for bound water an an upshift for bound OH-. For positive fields, theta mu(parallel to)(induced)/theta r(OH) is positive for both HDO and OH- and gives a downshift contribution.

  • 13.
    HERMANSSON, KERSTI
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    LINDGREN, JAN
    PROBST, MICHAEL M
    NONADDITIVITY OF OH FREQUENCY-SHIFTS IN ION WATER-SYSTEMS1995In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 233, no 4, p. 371-375Article in journal (Refereed)
    Abstract [en]

    The intramolecular OH stretching frequency shift observed for water on formation of 'cation-water...H-bond acceptor' complexes is highly non additive. The uncoupled OH frequency shift has been calculated by ab initio methods for q(+)-OH2 and OH2...q(-) complexes of different geometries and for a series of Mg2+.(H2O)(n)...(H2O)(m) complexes, and we argue that the non-additivity (cooperativity) of the frequency shifts is largely a consequence of the parabolic shape of the frequency versus electric field curves.

  • 14.
    HERMANSSON, KERSTI
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    OJAMAE, LARS
    ON THE ROLE OF ELECTRIC-FIELDS FOR PROTON-TRANSFER IN WATER1995In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 77, p. 34-42Article in journal (Refereed)
    Abstract [en]

    The influence of uniform and non-uniform electric fields on one-dimensional proton transfer curves for (H2O)(2), H5O2+ and H3O2- has been examined using quantum-mechanical ab initio calculations. Both liquid-state and solid-state environments are discussed. For the charged complexes the transfer barrier is removed or greatly reduced by a field as small as 0.005 a.u. (2.5 X 10(7) V/cm). Local field fluctuations of this size are easily produced in condensed aqueous systems at room temperature. For the asymmetric single-well potential of an (H2O)(2) complex, a field ten times larger is needed to move the minimum from one side to the other across the O ... O bond. Such local fields can be achieved in ionic aqueous systems. The energy barrier for proton transfer in ice Ih has been computed using a periodic Hartree-Fock approach; the barrier for a fully concerted proton transfer is similar to 60 kJ/mol.

  • 15. Koroleva, Elise B.
    et al.
    Bäckvall, Jan-E.
    Andersson, Pher
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Palladium-Catalyzed Stereocontrolled endo Cyclization of 3-hydroxypropyl-1,3-cyclohexadiene Leading to Versatile Fused Tetrahydropyrans1995In: Tetrahedron Letters, Vol. 36, no 30, p. 5397-5400Article in journal (Refereed)
  • 16.
    Lindblom, Torbjörn
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry, Analytical Chemistry.
    Christy, Alfred A.
    Libnau, Fred O.
    Quantitative determination of stabiliser in a single base propellant by chemometric analysis of Fourier transform infrared spectra1995In: Chemometrics and intelligent laboratory systems, ISSN 0169-7439, Vol. 29, p. 243-254Article in journal (Refereed)
  • 17.
    MATTSSON, G
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    NYHOLM, L
    OLIN, A
    ORNEMARK, U
    DETERMINATION OF SELENIUM IN FRESH-WATERS BY CATHODIC STRIPPING VOLTAMMETRY AFTER UV IRRADIATION1995In: TALANTA, ISSN 0039-9140, Vol. 42, no 6, p. 817-825Article in journal (Refereed)
    Abstract [en]

    An analytical method was developed for the determination of total dissolved selenium in fresh waters, using linear sweep cathodic stripping voltammetry (CSV) in combination with UV photolytic digestion. Both the CSV method, based on the electrodeposition

  • 18. O'Donnell, Martin J.
    et al.
    Zhou, Changyou
    Mi, Aiqiao
    Chen, Ning
    Kyle, Jeffrey A.
    Andersson, Pher
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Palladium-Catalyzed Reaction of a Malonate Anion with a Glycine Cation Equivalent: Bis-Phosphine Ligands and in situ Catalyst Formation1995In: Tetrahedron Letters, Vol. 36, no 24, p. 4205-4208Article in journal (Refereed)
  • 19.
    Pettersson-Fasth, Helena
    et al.
    Uppsala University.
    Gogoll, Adolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Bäckvall, Jan-Erling
    Uppsala University.
    Diastereoselectivity in the OsO4 Catalyzed Dihydroxylation of Tosylamido-3-hexene-2-ol Derivatives1995In: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, Vol. 60, no 6, p. 1848-1851p. 1848-1851Article in journal (Refereed)
    Abstract [en]

    The stereochemistry in dihydroxylation of 5-(p-toluenesulfonamido)-3-hexen-2-ol derivatives was studied. The product configuration was assigned by NMR.

  • 20.
    Rönn, Magnus
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Bäckvall, Jan-Erling
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Andersson, Pher
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Palladium(II)-catalyzed cyclization using molecular oxygen as reoxidant1995In: Tetrahedron Letters, Vol. 36, no 42, p. 7749-7752Article in journal (Refereed)
  • 21.
    YUN, H
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    LEE, ML
    MARKIDES, KE
    CHARCOAL POROUS LAYER OPEN-TUBULAR COLUMN GAS-CHROMATOGRAPHY FOR PERMANENT GAS-ANALYSIS1995In: JOURNAL OF MICROCOLUMN SEPARATIONS, ISSN 1040-7685, Vol. 7, no 3, p. 207-212Article in journal (Refereed)
    Abstract [en]

    The preparation of charcoal porous layer open tabular (PLOT) columns, and their application to the separation of permanent gases and light hydrocarbons are reported. Two types of charcoal, coconut and darco charcoal, were used to prepare columns from fus

1 - 21 of 21
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