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Sökning: L773:1359 7345

  • Resultat 11-20 av 511
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11.
  • Andersson, Hans, et al. (författare)
  • Efficient, mild and completely regioselective synthesis of substituted pyridines
  • 2010
  • Ingår i: Chemical Communications. - : RSC Publishing. - 1359-7345 .- 1364-548X. ; 46:19, s. 3384-3386
  • Tidskriftsartikel (refereegranskat)abstract
    • Addition of Grignard reagents to pyridine N-oxides in THF at low temperature (-78 to -20 °C) and treatment with TFAA provides an efficient general procedure for synthesis of substituted pyridines. The method is compatible with a range of functional groups such as esters, halogens and nitriles.
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12.
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13.
  • Ankner, Tobias, 1976, et al. (författare)
  • Selective cleavage of 3,5-bis-(trifluoromethyl)benzylcarbamate by SmI2-Et3N-H2O
  • 2013
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 49:61, s. 6867-6869
  • Tidskriftsartikel (refereegranskat)abstract
    • A novel electron poor protection group for amines has been developed. It undergoes rapid cleavage by SmI2-Et3N-H2O and its orthogonality towards the regular benzyl carbamate group (CBz) under reductive or transfer hydrogenolytic conditions is reported.
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14.
  • Antila, Liisa J., et al. (författare)
  • Hunting for the elusive shallow traps in TiO2 anatase
  • 2015
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 51:54, s. 10914-10916
  • Tidskriftsartikel (refereegranskat)abstract
    • Understanding electron mobility on TiO2 is crucial because of its applications in photocatalysis and solar cells. This work shows that shallow traps believed to be involved in electron migration in TiO2 conduction band are formed upon band gap excitation, i.e., are not pre-existing states. The shallow traps in TiO2 results from large polarons and are not restricted to surface.
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15.
  • Antoni, Per, et al. (författare)
  • A chemoselective approach for the accelerated synthesis of well-defined dendritic architectures
  • 2007
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; :22, s. 2249-2251
  • Tidskriftsartikel (refereegranskat)abstract
    • A chemoselective and layered growth approach has been developed for the synthesis of dendrimers, combining Click chemistry with traditional esterification/etherification reactions, without the need for activation steps and with excellent overall yields.
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16.
  • Arkhypchuk, Anna I., et al. (författare)
  • Triarylalkenes from the site-selective reductive cross-coupling of benzophenones and aldehydes
  • 2019
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 55:43, s. 6030-6033
  • Tidskriftsartikel (refereegranskat)abstract
    • PhP(Li)TMS converts benzophenones to phosphaalkenes which upon activation under oxidizing, basic conditions react with aromatic aldehydes under the formation of triarylalkenes. The one-pot reaction omits transition metals, proceeds at room temperature and precludes the formation of any homo-coupling products. Systematic substrate variations reveal reactivity patterns that are useful for the identification of ketone/aldehyde combinations that can be coupled in yields up to 80%.
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17.
  • Arrigan, Damien, et al. (författare)
  • Selective voltammetric detection of dopamine in the presence ofascorbate
  • 2004
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry. - 1359-7345 .- 1364-548X. ; :6, s. 732-733
  • Tidskriftsartikel (refereegranskat)abstract
    • The selective detection of dopamine in the presence of ascorbateis demonstrated based on the voltammetry of dopamine transferacross the interface between two immiscible electrolyte solutions(ITIES) facilitated by an organic-phase ionophore; ascorbatetransfer does not occur, leading to highly selectivedetection of dopamine in the presence of excess ascorbate.
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18.
  • Augusto Berrocal, Jose, et al. (författare)
  • Consequences of conformational flexibility in hydrogen-bond-driven self-assembly processes
  • 2016
  • Ingår i: Chemical Communications. - : ROYAL SOC CHEMISTRY. - 1359-7345 .- 1364-548X. ; 52:72, s. 10870-10873
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the synthesis and self-assembly of chiral, conformationally flexible C-3-symmetrical trisamides. A strong Cotton effect is observed for the supramolecular polymers in linear alkanes but not in cyclic alkanes. MD simulations suggest 2:1 conformations of the amides within the aggregates in both types of solvents, but a chiral bias in only linear alkanes.
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19.
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20.
  • Axelsson, Anton, 1991, et al. (författare)
  • Asymmetric aerobic oxidative NHC-catalysed synthesis of dihydropyranones utilising a system of electron transfer mediators
  • 2016
  • Ingår i: Chemical Communications. - 1364-548X .- 1359-7345. ; 52:77, s. 11571-11574
  • Tidskriftsartikel (refereegranskat)abstract
    • In the context of green chemistry, the replacement of high molecular weight stoichiometric oxidants with O2 is most desirable but difficult. Here, we report the asymmetric aerobic oxidative synthesis of dihydropyranones. The oxidation is aided by a system of electron transfer mediators and is selective toward the homoenolate. The dihydropyranones can be isolated in high to excellent yields, with high ee (up to 95%).
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