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Träfflista för sökning "WFRF:(Fristrup C) ;pers:(Norrby Per Ola 1962)"

Sökning: WFRF:(Fristrup C) > Norrby Per Ola 1962

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1.
  • Carroll, A. M., et al. (författare)
  • Synthetic and mechanistic studies in enantioselective allylic substitutions catalysed by palladium complexes of a modular class of axially chiral quinazoline-containing ligands
  • 2020
  • Ingår i: Tetrahedron. - : Elsevier BV. - 0040-4020. ; 76:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The application of palladium complexes of a modular series of axially chiral phosphinamine ligands, the Quinazolinaps, to the enantioselective alkylation of 1,3-diphenyl-2-propenyl acetate with dimethyl malonate and methyl dimethyl malonate is described. Complete conversions and enantiomeric excesses of up to 91% were obtained. To elucidate the solution structure of these complexes and their dynamic behaviour, 2D COSY and NOESY NMR experiments were carried out. An X-ray crystal structure of a palladacycle derived from 2-phenylQuinazolinap which possesses two Pd3Cl5 units is shown. Computational studies were also undertaken to allow qualitative predictions of diastereomeric ratios. The observed enantioselectivity was then rationalised in terms of combined spectroscopic and theoretical data. The catalytic results obtained are best interpreted by the reaction proceeding with nucleophilic attack on the allyl trans to the phosphorus donor atom of the major diastereomeric intermediate. (C) 2019 Elsevier Ltd. All rights reserved.
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2.
  • Santilli, C., et al. (författare)
  • The Manganese-Catalyzed Cross-Coupling Reaction and the Influence of Trace Metals
  • 2017
  • Ingår i: European Journal of Organic Chemistry. - : Wiley. - 1434-193X. ; 2017:35, s. 5269-5274
  • Tidskriftsartikel (refereegranskat)abstract
    • The substrate scope of the MnCl2-catalyzed cross-coupling between aryl halides and Grignard reagents has been extended to several methyl-substituted aryl iodides by performing the reaction at elevated temperature in a microwave oven. A radical clock experiment revealed the presence of an aryl radical as an intermediate leading to the proposal of an SRN1 pathway for the coupling. The mechanistic information gave rise to suspicion about two previously published cross-coupling reactions catalyzed by manganese(II) salts. As a result, the coupling between aryl halides and organostannanes as well as between aryl halides and amines were revisited. Both reactions were found impossible to reproduce without the addition of small amounts of palladium or copper and are therefore not believed to be catalyzed by manganese. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Norrby, Per-Ola,... (2)Ta bort avgränsningen
Fristrup, P (2)
McCarthy, M. (1)
Antonacci, G. (1)
Ahlburg, A. (1)
Madsen, R. (1)
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Carroll, A. M. (1)
Lacey, P. M. (1)
Saunders, C. P. (1)
Connolly, D. J. (1)
Farrell, A. (1)
Rokade, B. V. (1)
Goddard, R. (1)
Guiry, P. J. (1)
Santilli, C. (1)
Beigbaghlou, S. S. (1)
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Göteborgs universitet (2)
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