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Showing 1–10 of 10 results
Advanced filters: Author: Yasutomo Segawa Clear advanced filters

  • Alkylphosphonates are used as chargeneutral replacements for naturally-occurring phosphodiester backbones in nucleotides but the choice of alkyl moieties that can be attached to phosphorus atoms in these compounds is limited to methyl groups or primary/secondary alkyls. Here, the authors demonstrate the tertiary alkylation of the phosphorus atoms of phosphites bearing two 2’-deoxynuclosides using a carbocation generated via a light-driven radical-polar crossover mechanism

    • Kenji Ota
    • Kazunori Nagao
    • Hirohisa Ohmiya
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-9

  • Strategies for the creation of topological carbon nanostructures have greatly advanced synthetic organic chemistry and materials science. Now, the synthesis of a Möbius carbon nanobelt, a molecule with a twist on belt-shaped aromatic hydrocarbons, is reported.

    • Yasutomo Segawa
    • Tsugunori Watanabe
    • Kenichiro Itami
    ResearchOpen Access
    Nature Synthesis
    Volume: 1, P: 535-541

  • Synthetic methods for the preparation of perfluorinated aromatic compounds are desirable in materials science. Here, the authors synthesize perfluorocycloparaphenylenes, fully fluorinated carbon nanorings, through a nickel-mediated one-pot method.

    • Hiroki Shudo
    • Motonobu Kuwayama
    • Kenichiro Itami
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-6

  • The Mackay crystal is a proposed—but synthetically unachieved—nanocarbon molecule that is anticipated to have many desirable properties. Now, a strategy based on annulative coupling of chlorophenanthrene derivatives is reported, allowing streamlined access to an important substructure.

    • Satoshi Matsubara
    • Yoshito Koga
    • Kenichiro Itami
    Research
    Nature Catalysis
    Volume: 3, P: 710-718

  • The synthesis of a zigzag carbon nanobelt has been achieved through an iterative Diels–Alder reaction followed by reductive aromatization. The isolated nanobelt was fully characterized by X-ray crystallography and its wide energy gap with blue fluorescence properties was revealed by photophysical measurements.

    • Kwan Yin Cheung
    • Kosuke Watanabe
    • Kenichiro Itami
    Research
    Nature Chemistry
    Volume: 13, P: 255-259

  • Carbon nanotubes (CNTs) are typically produced as a mixture of tubes with different diameters and sidewall structures — parameters that determine the optical and electronic properties of these materials. Now, it has been shown that discrete carbon nanorings can be used as templates to control the bottom-up growth of CNTs with a narrow distribution of diameters.

    • Haruka Omachi
    • Takuya Nakayama
    • Kenichiro Itami
    Research
    Nature Chemistry
    Volume: 5, P: 572-576

  • This study reports Stomidazolone, a doubly-sulfonylated imidazolone that inhibits stomatal differentiation by binding to the ACT-Like domain of MUTE, disrupting its interaction with the bHLH partner SCREAM, which expands the chemical toolkit for manipulating bHLH-ACTL protein interactions, offering new avenues for controlling plant development.

    • Ayami Nakagawa
    • Krishna Mohan Sepuru
    • Keiko U. Torii
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-17

  • A grossly warped nanographene, C80H30, that incorporates five 7-membered rings and one 5-membered ring embedded in a hexagonal lattice has been synthesized, isolated and fully characterized. Experiments revealing how the properties of such a large graphene subunit are affected by multiple odd-membered-ring defects are also reported.

    • Katsuaki Kawasumi
    • Qianyan Zhang
    • Kenichiro Itami
    Research
    Nature Chemistry
    Volume: 5, P: 739-744

  • A lack of general methods for making multisubstituted benzene derivatives means that only a small fraction of the huge number of possible structures based on this ubiquitous building block have been explored. Now, a programmed synthesis of hexaarylbenzenes using C–H activation, cross-coupling and [4 + 2] cycloaddition reactions has been developed that can also be applied to tetraarylnaphthalenes and pentaarylpyridines.

    • Shin Suzuki
    • Yasutomo Segawa
    • Junichiro Yamaguchi
    Research
    Nature Chemistry
    Volume: 7, P: 227-233

  • Conventional synthesis of nanocarbons, such as graphene, fullerenes and carbon nanotubes, yields mixtures of molecules with varying structures. However, harnessing the full potential of these materials demands atomically precise synthesis methods. Recent advances using organic chemistry are discussed in this Review.

    • Yasutomo Segawa
    • Hideto Ito
    • Kenichiro Itami
    Reviews
    Nature Reviews Materials
    Volume: 1, P: 1-14