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Träfflista för sökning "WFRF:(Nilsson Mats) ;pers:(Larhed Mats)"

Sökning: WFRF:(Nilsson Mats) > Larhed Mats

  • Resultat 1-10 av 42
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  • Andappan, Murugaiah, et al. (författare)
  • Arylboronic acids as versatile coupling partners in fast microwave promoted oxidative Heck chemistry
  • 2003
  • Ingår i: Molecular diversity. - 1381-1991 .- 1573-501X. ; 7:2-4, s. 97-106
  • Tidskriftsartikel (refereegranskat)abstract
    • The useful and selective reactivity of arylboronic acids makes them favourite building blocks for many modern organic chemistry applications like the metal-mediated formation of C-C, C-O, C-N, and C-S bonds. This report describes oxidative Heck coupling reactions of arylboronic acids and olefins, which were conveniently and rapidly (5-30 min) carried out under air with temperature-controlled microwave heating. Different reaction conditions were investigated with regard to both microwave heating capability and chemical productivity. Copper(II) acetate was identified as a microwave compatible reoxidant of Pd(0). The scope and limitations of this high-speed chemistry protocol with diverse olefins and organoboronic acids are discussed.
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  • Datta, Gopal K., et al. (författare)
  • Enantiopure 2-Aryl-2-Methyl Cyclopentanones by an Asymmetric Chelation-Controlled Heck Reaction Using Aryl Bromides : Increased Preparative Scope and Effect of Ring Size on Reactivity and Selectivity
  • 2008
  • Ingår i: Tetrahedron. - : Elsevier BV. - 0957-4166 .- 1362-511X. ; 19:9, s. 1120-1126
  • Tidskriftsartikel (refereegranskat)abstract
    • Quaternary 2-aryl-2-methyl cyclopentanones were obtained in 85–94% ee via Pd(0)-catalyzed chelation-controlled asymmetric arylation of a cyclopentenyl ether with aryl bromides and subsequent hydrolysis. Two new cyclohexenyl ethers were synthesized and evaluated as Heck substrates with both aryl iodides and bromides under different reaction conditions. Arylations of the six-membered vinyl ether 1-methyl-2-(S)-(cyclohex-1-enyloxymethyl)-pyrrolidine with aryl bromides were achieved with t-Bu3P-promoted palladium catalysis using either classical or microwave heating. Isolated Heck products were also obtained in high diastereoselectivities (94–98% de).
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6.
  • Enquist, Per-Anders, et al. (författare)
  • ESI-MS Detection of Proposed Reaction Intermediates in the Air-Promoted and Ligand-Modulated Oxidative Heck Reaction
  • 2006
  • Ingår i: Journal of Organic Chemistry. - : American Chemical Society (ACS). - 0022-3263 .- 1520-6904. ; 71:23, s. 8779-8786
  • Tidskriftsartikel (refereegranskat)abstract
    • Electrospray ionization mass spectrometry (ESI-MS) and subsequent MS/MS analyses were used to directly detect palladium-containing cationic reaction intermediates in a ligand controlled palladium(II)-catalyzed oxidative Heck arylation. All potential intermediates were observed as dmphen-ligated palladium(II) species, suggesting that the dmphen bidentate ligand is attached to the metal center during the entire catalytic cycle. The study supports previous mechanistic propositions and provides new information regarding the composition of aryl-containing Pd(II) complexes in an ongoing oxidative Heck reaction. In addition, sodium acetate was found to be a useful base alternative to previously used tertiary amines.
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7.
  • Enquist, Per-Anders, et al. (författare)
  • Open-air oxidative Heck reactions at room temperature
  • 2006
  • Ingår i: Green Chemistry. - 1463-9262 .- 1463-9270. ; 8:4, s. 338-343
  • Tidskriftsartikel (refereegranskat)abstract
    • Palladium(II)-catalyzed oxidative Heck arylation reactions proceed at room temperature with atmospheric air as the sole reoxidant. Using arylboronic acids as arylating agents and inexpensive 2,9-dimethyl-1,10-phenanthroline as the supporting ligand, efficient vinylic substitution reactions were obtained both with electron-poor and electron-rich olefins on a 1–50 mmol scale.
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  • Resultat 1-10 av 42
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