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Yamaguchi-shi, Japan

Kanazawa Y.,Tottori University | Yokota T.,Tottori University | Ogasa H.,Tottori University | Watanabe H.,Nihon University | And 3 more authors.
Tetrahedron | Year: 2015

We report the chemoselective amination of bromoiodobenzenes with diarylamines by palladium/Xantphos or a ligand-free copper catalyst. The reactions by these two types of catalysts proceeded with a high chemoselectivity and afforded monobrominated triarylamines in good yields. These products are useful intermediates for the synthesis of unsymmetrical bistriarylamines. © 2015 Elsevier Ltd. All rights reserved. Source

Matsuoka H.,Kyoto University | Hachisuka M.,Kyoto University | Uda K.,Kyoto University | Onishi T.,Kyoto University | Ozoe S.,Tosoh Organic Chemical Co.
Chemistry Letters | Year: 2012

Ionic amphiphilic diblock copolymers, such as polystyreneb- poly(styrenesulfonate), show non-surface activity when some requirements are satisfied. The main origin of this unique property has been thought to be an image charge repulsion at the air/water interface. In this study, surface activity/non-activity was examined for random copolymers in addition to homopolymers. Random copolymers of styrene and styrenesulfonate were found to be surface active, while the poly(styrenesulfonate) homopolymer was slightly surface active. This observation cannot be interpreted by image charge repulsion alone since these are all polyanions and the block copolymer is mostly hydrophobic. Stable polymer micelle formation in the block copolymer system is also an essential origin of non-surface activity. © 2012 The Chemical Society of Japan. Source

Kuwano R.,Kyushu University | Matsumoto Y.,Kyushu University | Shige T.,Kyushu University | Tanaka T.,Kyushu University | And 2 more authors.
Synlett | Year: 2010

Bis(ortho-substituted aryl)amines were arylated on the nitrogen atom with various haloarenes in high yields using the palladium catalyst, which was generated from palladium(II) acetate and tri(tert-butyl)phosphine. © Georg Thieme Verlag Stuttgart. Source

Eguchi H.,Tosoh Organic Chemical Co. | Nishiyama M.,Tosoh Corporation | Ishikawa S.-I.,Tosoh Corporation | Soga S.-I.,Tosoh Organic Chemical Co. | Koie Y.,Tosoh Corporation
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry | Year: 2012

Ttransition-metal catalyzed cross-coupling reactions (C-C, C-N) are the useful and powerful tools for the synthesis of OLED (organic light emitting diode) or LCD (liquid crystal display) materials. For many years, a major drawback of this reaction has been the poor reactivity of aryl chloride, which are more attractive in terms of cost and availability than the corresponding bromide, iodide and triflate. This review summarized the recent developments combined with our work utilizing the aryl chloride in this area. Source

Provided are high purity sodium p-styrenesulfonate with an excellent hue which is useful as a reactive emulsifier or dispersant for producing a polymer emulsion, or synthetic starch for clothing ironing and poly(sodium p-styrene-sulfonate) with an excellent hue using the same or sodium p-styrenesulfonate improved in fluidity while keeping good solubility. An aqueous p--bromoethylbenzenesulfonic acid solution and an aqueous sodium hydroxide solution are reacted under specific conditions to control the particle size, thereby obtaining sodium p-styrenesulfonate particles improved in a balance between fluidity and solubility, and further, impurities such as isomers are reduced, thereby obtaining high-purity sodium p-styrenesulfonate with an excellent hue.

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