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15 results on '"Hashizume, Daisuke"'

3. Flexibility Control of Two‐Dimensional Coordination Polymers by Crystal Morphology: Water Adsorption and Thermal Expansion

Author

Ohtani, Ryo, primary, Yoshino, Haruka, additional, Yanagisawa, Junichi, additional, Ohtsu, Hiroyoshi, additional, Hashizume, Daisuke, additional, Hijikata, Yuh, additional, Pirillo, Jenny, additional, Sadakiyo, Masaaki, additional, Kato, Kenichi, additional, Shudo, Yuta, additional, Hayami, Shinya, additional, Le Ouay, Benjamin, additional, and Ohba, Masaaki, additional

Published
2021
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5. Synthesis of All Stereoisomers of Monomeric Spectomycin A1/A2 and Evaluation of Their Protein SUMOylation‐Inhibitory Activity

Author

Nomura, Yusaku, primary, Thuaud, Frédéric, additional, Sekine, Daisuke, additional, Ito, Akihiro, additional, Maeda, Satoko, additional, Koshino, Hiroyuki, additional, Hashizume, Daisuke, additional, Muranaka, Atsuya, additional, Cruchter, Thomas, additional, Uchiyama, Masanobu, additional, Ichikawa, Satoshi, additional, Matsuda, Akira, additional, Yoshida, Minoru, additional, Hirai, Go, additional, and Sodeoka, Mikiko, additional

Published
2019
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9. Synthesis and Structure of a Stable Bis(methylene)‐λ4‐sulfane.

Author

Sugamata, Koh, Hashizume, Daisuke, Suzuki, Yuko, Sasamori, Takahiro, and Ishii, Shigeru

Subjects
*CHEMICAL synthesis, *METHYLENIMINE, *CRYSTALS, *SULFUR, *MOLECULAR structure
Abstract

Abstract: Bis(methylene)‐λ4‐sulfane 1, a >C=S=C< heterocumulene, was obtained as a red crystalline solid from the reaction between elemental sulfur and a carbenoid that contains sterically demanding silylalkyl groups. Under atmospheric conditions, and even at elevated temperatures, 1 exhibits extraordinary stability. The molecular structure and electron‐density distribution of 1 were analyzed by single‐crystal X‐ray diffraction analysis, which revealed a bent C=S=C geometry with C=S=C π‐bonds. These results, combined with those of variable‐temperature NMR measurements and theoretical calculations suggest a slow rotation of the S=C moieties in 1, the stability and structure of which were further examined by theoretical calculations. [ABSTRACT FROM AUTHOR]

Published
2018
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10. Effects of N-Oxidation on Heteroaromatic Macrocycles: Synthesis, Electronic Structures, Spectral Properties, and Reactivities of Tetraazaporphyrin meso- N-Oxides.

Author

Toriumi, Naoyuki, Yanagi, Shunsuke, Muranaka, Atsuya, Hashizume, Daisuke, and Uchiyama, Masanobu

Subjects
AROMATIC compounds, MACROCYCLIC compounds, ELECTRONIC structure, CHEMICAL reactions, PORPHYRAZINES, ORGANIC chemistry
Abstract

Heteroaromatic N-oxides such as pyridine and quinoline N-oxides are well studied in organic chemistry, and N-oxide formation has long been utilized for tuning the reactivities of heteroaromatics. However, the scope of aromatic N-oxidation is still restricted to relatively small azine or azole skeletons, and there has been little investigation of the photophysical/chemical effects of N-oxidation on larger heteroaromatic systems. Here, the synthesis and unique properties of new macrocyclic heteroaromatic N-oxides, tetraazaporphyrin (TAP) meso- N-oxides, are reported. N-Oxidation of TAP reduced the 18π-aromaticity of the TAP ring compared with that of the parent TAP owing to the cross-conjugated resonance structure. The optical properties of TAPs were significantly changed by N-oxidation: the N-oxides did not exhibit azaporphyrin-like but instead porphyrin-like optical properties, that is, weak Q absorption bands, strong Soret absorption bands, and weak fluorescence. These features can be explained by the near-degenerate frontier molecular orbitals resulting from N-oxide formation. Singlet oxygen quantum yields were greatly increased to almost quantitative levels by N-oxidation. The N-oxides showed near-IR-responsive photoredox properties and were suitable as both oxidants and sensitizers for oxidation reactions. Protonation of the N-oxides restored TAP-like intense Q bands and red fluorescence, offering a potential design strategy for fluorescence switches. [ABSTRACT FROM AUTHOR]

Published
2017
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13. Synthesis, Characterization, and Spectroscopic Analysis of Antiaromatic Benzofused Metalloporphyrins

Author

Sugawara, Shun, primary, Hirata, Yusuke, additional, Kojima, Satoshi, additional, Yamamoto, Yohsuke, additional, Miyazaki, Eigo, additional, Takimiya, Kazuo, additional, Matsukawa, Shiro, additional, Hashizume, Daisuke, additional, Mack, John, additional, Kobayashi, Nagao, additional, Fu, Zhen, additional, Kadish, Karl M., additional, Sung, Young Mo, additional, Kim, Kil Suk, additional, and Kim, Dongho, additional

Published
2012
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