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Arsole

The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform

Pakhing Leung – 1st expert on this subject based on the ideXlab platform

  • palladium promoted asymmetric cycloaddition reaction of Arsole via an unusual exo endo stereochemically controlled method
    Journal of Organometallic Chemistry, 2014
    Co-Authors: Zhijuan Yu, Sumod A Pullarkat, Pakhing Leung

    Abstract:

    Asymmetric cycloaddition reaction between 3,4-dimethyl-1-phenylArsole and ethyl vinyl ketone was promoted by the palladium complex containing ortho-metalated (S)-[1-(dimethylamino)ethyl]naphthalene as the chiral auxiliary. The keto group in the resulting arsanorbornene cycloadducts could be located stereospecifically in the endo or exo position by controlling the electronic properties of the organopalladium promoter. In the intermolecular cycloaddition reaction, a pair of separable diastereomeric palladium complexes was obtained in the ratio of 2:1. In the intramolecular process, however, only one As–O bidentate arsanorbornene palladium complex was produced stereoselectively. The arsenic-elimination reaction was readily observed on the corresponding endo- and exo-ketoarsine ligands. The absolute configuration and the coordination property of the enantiomerically pure endo-cycloadduct had been established by single-crystal X-ray analysis.

  • Palladium-promoted asymmetric cycloaddition reaction of Arsole via an unusual exo–endo stereochemically controlled method
    Journal of Organometallic Chemistry, 2014
    Co-Authors: Mengtao Ma, Zhijuan Yu, Sumod A Pullarkat, Pakhing Leung

    Abstract:

    Asymmetric cycloaddition reaction between 3,4-dimethyl-1-phenylArsole and ethyl vinyl ketone was promoted by the palladium complex containing ortho-metalated (S)-[1-(dimethylamino)ethyl]naphthalene as the chiral auxiliary. The keto group in the resulting arsanorbornene cycloadducts could be located stereospecifically in the endo or exo position by controlling the electronic properties of the organopalladium promoter. In the intermolecular cycloaddition reaction, a pair of separable diastereomeric palladium complexes was obtained in the ratio of 2:1. In the intramolecular process, however, only one As–O bidentate arsanorbornene palladium complex was produced stereoselectively. The arsenic-elimination reaction was readily observed on the corresponding endo- and exo-ketoarsine ligands. The absolute configuration and the coordination property of the enantiomerically pure endo-cycloadduct had been established by single-crystal X-ray analysis.

Kensuke Naka – 2nd expert on this subject based on the ideXlab platform

  • highly efficient singlet oxygen generation and high oxidation resistance enhanced by Arsole polymer based photosensitizer application as a recyclable photooxidation catalyst
    Macromolecules, 2020
    Co-Authors: Susumu Tanaka, Hiroaki Imoto, Takuji Kato, Toshiaki Enoki, Yousuke Ooyama, Joji Ohshita, Kensuke Naka

    Abstract:

    Photosensitizers have attracted considerable attention in various fields such as organic synthesis and medical care. For the development of high-performance photosensitizers, highly efficient and p…

  • The Dawn of Functional Organoarsenic Chemistry.
    Chemistry: A European Journal, 2018
    Co-Authors: Hiroaki Imoto, Kensuke Naka

    Abstract:

    : Organoarsenic chemistry was actively studied until the middle of 20th century. Although various properties of organoarsenic compounds have been computationally predicted, for example, frontier orbital levels, aromaticity, and inversion energies, serious concern to the danger of their synthetic processes has restricted experimental studies. Conventional synthetic routes require volatile and toxic arsenic precursors. Recently, nonvolatile intermediate transformation (NIT) methods have been developed to safely access functional organoarsenic compounds. Important intermediates in the NIT methods are cyclooligoarsines, which are prepared from nonvolatile inorganic precursors. In particular, the new approach has realized experimental studies on conjugated arsenic compounds: Arsole derivatives. The elucidation of their intrinsic properties has triggered studies on functional organoarsenic chemistry. As a result, various kinds of arsenic-containing π-conjugated molecules and polymers have been reported for the last few years. In this minireview, progress of this recently invigorated field is overviewed.

  • Peraryl Arsoles: Practical Synthesis, Electronic Structures, and Solid-State Emission Behaviors.
    Chemistry: A European Journal, 2018
    Co-Authors: Hiroaki Imoto, Aya Urushizaki, Ikuo Kawashima, Kensuke Naka

    Abstract:

    : 2,3,4,5-Tetraaryl-1-phenylArsoles were synthesized by utilizing safely generated diiodophenylarsine and zirconacyclopentadienes. The obtained peraryl Arsoles showed aggregation-induced emission (AIE), where intense emission was observed in the solid states (quantum yields up to 0.61), whereas the corresponding solutions were very weakly emissive. The optical and electronic properties were examined by experimental and computational methods. It was elucidated that the aryl groups at the 2,5-positions affected the frontier orbitals and the aromaticity of the Arsole core. On the other hand, those at the 1,3,5-positions were perpendicular to the luminophore and effective for a restriction of aggregation-caused quenching. Because the lone pair of the arsenic atom has a sufficient coordination ability due to the low aromaticity of the Arsole moiety, a gold(I) chloride complex of 1,2,3,4,5-pentaphenylArsole was synthesized. The complex formation caused a blue shift of the emission from the bare ligand. Interestingly, the complex showed luminescent mechanochromism; grinding the crystals with a blue emission (λem =445 nm) gave amorphous samples with a greenish-blue emission (λem =496 nm).

Zhijuan Yu – 3rd expert on this subject based on the ideXlab platform

  • palladium promoted asymmetric cycloaddition reaction of Arsole via an unusual exo endo stereochemically controlled method
    Journal of Organometallic Chemistry, 2014
    Co-Authors: Zhijuan Yu, Sumod A Pullarkat, Pakhing Leung

    Abstract:

    Asymmetric cycloaddition reaction between 3,4-dimethyl-1-phenylArsole and ethyl vinyl ketone was promoted by the palladium complex containing ortho-metalated (S)-[1-(dimethylamino)ethyl]naphthalene as the chiral auxiliary. The keto group in the resulting arsanorbornene cycloadducts could be located stereospecifically in the endo or exo position by controlling the electronic properties of the organopalladium promoter. In the intermolecular cycloaddition reaction, a pair of separable diastereomeric palladium complexes was obtained in the ratio of 2:1. In the intramolecular process, however, only one As–O bidentate arsanorbornene palladium complex was produced stereoselectively. The arsenic-elimination reaction was readily observed on the corresponding endo- and exo-ketoarsine ligands. The absolute configuration and the coordination property of the enantiomerically pure endo-cycloadduct had been established by single-crystal X-ray analysis.

  • Palladium-promoted asymmetric cycloaddition reaction of Arsole via an unusual exo–endo stereochemically controlled method
    Journal of Organometallic Chemistry, 2014
    Co-Authors: Mengtao Ma, Zhijuan Yu, Sumod A Pullarkat, Pakhing Leung

    Abstract:

    Asymmetric cycloaddition reaction between 3,4-dimethyl-1-phenylArsole and ethyl vinyl ketone was promoted by the palladium complex containing ortho-metalated (S)-[1-(dimethylamino)ethyl]naphthalene as the chiral auxiliary. The keto group in the resulting arsanorbornene cycloadducts could be located stereospecifically in the endo or exo position by controlling the electronic properties of the organopalladium promoter. In the intermolecular cycloaddition reaction, a pair of separable diastereomeric palladium complexes was obtained in the ratio of 2:1. In the intramolecular process, however, only one As–O bidentate arsanorbornene palladium complex was produced stereoselectively. The arsenic-elimination reaction was readily observed on the corresponding endo- and exo-ketoarsine ligands. The absolute configuration and the coordination property of the enantiomerically pure endo-cycloadduct had been established by single-crystal X-ray analysis.