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8,909 results
  • Light-driven deracemization enabled by excited-state electron transfer. [Journal Article]
    Science 2019; 366(6463):364-369Shin NY, Ryss JM, … Knowles RR
  • Deracemization is an attractive strategy for asymmetric synthesis, but intrinsic energetic challenges have limited its development. Here, we report a deracemization method in which amine derivatives undergo spontaneous optical enrichment upon exposure to visible light in the presence of three distinct molecular catalysts. Initiated by an excited-state iridium chromophore, this reaction proceeds t…
  • Novel phosphorescent triptycene-based Ir(iii) complexes for organic light-emitting diodes. [Journal Article]
    Dalton Trans 2019Wang Y, Xiao YP, … Mei QB
  • A series of charge-neutral cyclometalated iridium(iii) complexes (1-3 and 5-7) containing triptycene-substituted ligands (tbt and tpbi) and two parent complexes (4 and 8) were synthesized and characterized. The crystal structures indicated that π-π stacking interactions existed in ligand tbtH, but not in complex 6. However, a large intramolecular repulsion was found in complex 6. These triptycene…
  • Anti-Markovnikov Hydroamination of Unactivated Alkenes with Primary Alkyl Amines. [Journal Article]
    J Am Chem Soc 2019Miller DC, Ganley JM, … Knowles RR
  • We report here a photocatalytic method for the intermolecular anti-Markovnikov hydroamination of unactivated olefins with primary alkyl amines to selectively furnish secondary amine products. These reactions proceed through aminium radical cation (ARC) intermediates and occur at room temperature under visible light irradiation in the presence of an iridium photocatalyst and an aryl thiol hydrogen…
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