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Showing 1–5 of 5 results
Advanced filters: Author: Hau Sun Sam Chan Clear advanced filters

  • Exploration of the chemistry of allylic, benzylic, propargylic and allenylic oxonium ions is lacking despite the latest developments in onium ion chemistry. Now, a unified approach for the synthesis and NMR spectroscopic characterization of these unusual species is reported, helping to understand their reactivity.

    • Hau Sun Sam Chan
    • Yingzi Li
    • Jonathan W. Burton
    Research
    Nature Synthesis
    P: 1-12

  • Palladium-catalysed C(sp3)–H amination reactions of carboxylic acids are challenging due to N-coordination often outcompeting the carboxylic acid directing effect. Now, the development of chlorinated pyridine–pyridone ligands for palladium-catalysed methylene C(sp3)–H lactamization and cycloamination is reported, enabling the synthesis of lactams and cyclic amines.

    • Hau Sun Sam Chan
    • Yilin Lu
    • Jin-Quan Yu
    Research
    Nature Synthesis
    Volume: 3, P: 752-762

  • In an inter-laboratory study, the authors compare the accuracy and performance of three optical density calibration protocols (colloidal silica, serial dilution of silica microspheres, and colony-forming unit (CFU) assay). They demonstrate that serial dilution of silica microspheres is the best of these tested protocols, allowing precise and robust calibration that is easily assessed for quality control and can also evaluate the effective linear range of an instrument.

    • Jacob Beal
    • Natalie G. Farny
    • Jiajie Zhou
    ResearchOpen Access
    Communications Biology
    Volume: 3, P: 1-29