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Wakayama-shi, Japan

Nomoto A.,Osaka Prefecture University | Taniguchi T.,Osaka Prefecture University | Taniguchi T.,Seika Corporation | Minatobe Y.,Osaka Prefecture University | And 4 more authors.

A novel cysteine-incorporated anthraquinone derivative was synthesized, and its molecular structure was determined by X-ray crystal analysis. Each mercapto group was located separately and did not form a disulfide bond, and hydrogen bondings and Π-Π interaction were observed from the packing structure. © 2015 by the authors; licensee. Source

Seika Corporation | Date: 1992-04-07

computer cartridge games.

Seika Corporation | Date: 1993-03-26

video games.

Imoto M.,Osaka Prefecture University | Ikeda H.,Seika Corporation | Tamaki A.,Osaka Prefecture University | Takeda M.,Osaka Prefecture University | Mizuno K.,Seika Corporation
Organic Letters

Figure presented An intramolecular exciplex is formed upon excitation of the cyclohexane solution of the 1,4-dicyano-2-methylnaphthalene-N,N-dimethyl-p- toluidine dyad, but little if any intramolecular CT complex exists in the ground state of this substance in solution. In contrast, in the crystalline state, the dyad forms an intermolecular mixed-stack CT complex in the ground state and an intermolecular exciplex when it is photoexcited. © 2010 American Chemical Society. Source

Imoto M.,Seika Corporation | Takeda M.,Seika Corporation | Tamaki A.,Seika Corporation | Taniguchi H.,Seika Corporation | And 2 more authors.
Journal of Organic Chemistry

Observations show that nitroanilines exhibit an unusually high S NAr reactivity with OH- in aqueous media in reactions that produce nitrophenols. SNAr reaction of 4-nitroaniline (2a) in aqueous NaOH for 16 h yields 4-nitrophenol (4a) quantitatively, whereas a similar reaction of 4-nitrochlorobenzene (1a) gave 4a in 2% yield together with recovered 1a in 97%, suggesting that the leaving ability of the NH2 group far surpasses that of Cl under these conditions. An essential feature of SNAr reactions of nitroanilines is probably that the NH2 leaving group participates in a hydrogen-bonding interaction with H 2O. Density functional theory (DFT) calculations for a set of 4-nitroaniline, OH-, and H2O suggest a possible formation of a Meisenheimer complex stabilized by hydrogen-bonding interactions and a six-membered ring structure. The results obtained here contrast with conventional SNAr reactivity profiles in which nitroanilines are nearly unreactive with nucleophiles in organic solvents. © 2011 American Chemical Society. Source

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