検索結果 518件中 1-20 を表示

  • Evaluation of piezoelectric Ta

    Sugaya Yu , Kakio Shoji

    … The possibility that the Ta<inf>2</inf>O<inf>5</inf>thin films were crystallized to orthorhombic Ta<inf>2</inf>O<inf>5</inf>on SrTiO<inf>3</inf>substrates by providing a buffer layer deposited without applying O<inf>2</inf>radical power was demonstrated. … Unfortunately, the coupling factor of the crystalline thin film was less than 0.3% for h/λ …

    Jpn. J. Appl. Phys. 56(7S1), 07JD12, 2017-06-23

    応用物理学会

  • Porous hydrocarbon networks of pyramidal molecules

    Sorimachi Jun-ya , Okada Susumu

    … Using the density functional theory with generalized gradient approximation, we theoretically design porous hydrocarbon networks by assembling pyramidal hydrocarbon molecules with S = 1/2 radical spin. … Furthermore, owing to the radical spin on the pyramidal molecules, the porous hydrocarbon network exhibits magnetic spin ordering with various spin configurations for metastable states, because the polarized electron spin forms a Kagome lattice and prefers singlet spin–spin coupling. …

    Jpn. J. Appl. Phys. 56(6S1), 06GE03, 2017-04-27

    応用物理学会

  • Tetrabutylammonium Salts of Aluminum(III) and Gallium(III) Phthalocyanine Radical Anions Bonded with Fluoren-9-olato(-) Anions and Indium(III) Phthalocyanine Bromide Radical Anions.

    Konarev Dmitri V , Khasanov Salavat S , Ishikawa Manabu , Nakano Yoshiaki , Otsuka Akihiro , Yamochi Hideki , Saito Gunzi , Lyubovskaya Rimma N

    … The salts were found to contain Pc(.3-) radical anions with negatively charged phthalocyanine macrocycles, as evidenced by the presence of intense bands of Pc(.3-) in the near-IR region and a noticeable blueshift in both the Q and Soret bands of phthalocyanine. …

    Chemistry - an Asian journal 12(8), 910-919, 2017-04-18

    機関リポジトリ DOI

  • ポリフォルオレンセグメントを含むブロック共重合体の合成と蛍光発光特性

    椎橋 佑太

    … Rod-Coil block copolymers composed of poly(9,9-dihexylfluorene) (PF, Rod), polystyrene (PS, Coil) were synthesized by a combination of Suzuki coupling polymerization and an atom transfer radical polymerization. …

    法政大学大学院紀要理工学・工学研究科編 58, 2017-03-31

    機関リポジトリ

  • ニトロニルニトロキシドラジカルを基盤とした開殻π造形

    鈴木 修一 , 小嵜 正敏 , 岡田 惠次

    … One of the key approaches for solving this problem is to develop metal-introduced nitronyl nitroxide at the C2 position: This radical-metal complex can be used as a stable equivalent of the C2-H deprotonated anion of the parent nitronyl nitroxide and can be applied to the cross-coupling reagent to introduce the nitronyl nitroxide skeleton in the reaction with aryl halides. …

    有機合成化学協会誌 75(9), 955-964, 2017

    J-STAGE

  • UV-curable Thiol-ene Systems Composed of Dendritic Polyenes to Improve Photosensitivity

    Aoki Ken'ichi , Imanishi Ryota

    … The photosensitivity of the norbornene-based dendritic resins was markedly improved by the activation of two types of polymerizations including thiol-ene polymerizations and radical-radical coupling. …

    Journal of Photopolymer Science and Technology 30(4), 421-424, 2017

    J-STAGE

  • Catalyst Design of Iron Complexes

    Nagashima Hideo

    … A series of "(R<sub>3</sub>TACN)FeX<sub>2</sub>" complexes were prepared and found to be good catalysts for atom transfer radical polymerization, giving rise to well-controlled polymerization of styrene, methacrylates, and acrylates with high activity. …

    Bulletin of the Chemical Society of Japan 90(7), 761-775, 2017

    J-STAGE

  • Molecular Structure of Poly(vinyl alcohol)-Derived Carbon-Centered Radicals Studied by Rapid-Flow and Spin-Trapping ESR Measurements: A Short-Lived Intermediate Radical in the Initial Stage of the Graft Polymerization Reaction

    Nishihara Yuko , Matsui Kazuma , Kuwabara Keiko , Murata Naoya , Yamaguchi Tomoko , Miyake Yusuke , Ikegami Tohru , Kanaori Kenji , Tajima Kunihiko

    … Based on the observed proton hyperfine coupling constant (hfcc) values, species A was assigned to the carbon-centered radical of PVA produced by hydrogen atom abstraction from the methine carbon bearing a hydroxyl group. … were ascribed to two structural isomers of the PVA-derived, carbonyl-conjugated radical produced by acid-catalyzed radical reaction at the vicinal diol moiety (i.e., head-to-head structure) of PVA. …

    Bulletin of the Chemical Society of Japan 90(2), 244-253, 2017

    J-STAGE

  • Electrochemical reduction of cationic Li+@C60to neutral Li+@C60˙−: isolation and characterisation of endohedral [60]fulleride

    Ueno Hiroshi , Aoyagi Shinobu , Yamazaki Yu , Ohkubo Kei , Ikuma Naohiko , Okada Hiroshi , Kato Tatsuhisa , Matsuo Yutaka , Fukuzumi Shunichi , Kokubo Ken

    … Lithium-encapsulated [60]fullerene Li@C60, namely, lithium-ion-encapsulated [60]fullerene radical anion Li+@C60˙−, was synthesised by electrochemical reduction of lithium-ion-encapsulated [60]fullerene trifluoromethanesulfonylimide salt [Li+@C60](TFSI−). … In solution Li@C60 exists as a monomer form dominantly, while in the crystal state it forms a dimer (Li@C60–Li@C60) through coupling of the C60 radical anion cage. …

    Chemical Science 7(9), 5770-5774, 2016-09-01

    機関リポジトリ DOI

  • Excited-state Dynamics and Spin-exchange Coupling of Anthracene–Verdazyl Radical in Frozen Glass Matrix Investigated by Transient Absorption Spectroscopy

    Ito Akitaka , Hinoshita Masumi , Kato Ken , Teki Yoshio

    … <p>Excited-state dynamics of an anthracene–verdazyl radical diluted in a frozen glass matrix (2-MTHF) has been clarified by transient absorption spectroscopy. … The magnitude of the intramolecular exchange coupling was determined from the temperature dependence of the decay time of the transient absorption signal of the high-spin quartet state, which was consistent with the theoretical prediction.</p> …

    Chemistry Letters 45(11), 1324-1326, 2016

    J-STAGE

  • 昆虫摂食阻害物質であるアザジラクチンの合成

    森 直紀 , 伊藤 大輔 , 渡邉 秀典

    … After a coupling of both segments, the key tandem radical cyclization reaction was performed to elaborate the full carbon framework of <b>1</b>. …

    有機合成化学協会誌 74(9), 903-912, 2016

    J-STAGE

  • Ligand-Driven Exchange Coupling in Graphene-Based Magnetic Materials

    Van Thanh Nguyen , Tuan Nguyen Anh , Anh Pham Thi Tuan , Cuong Nguyen Viet , Chi Dam Hieu

    … Our calculated results show that the perinaphthenyl radical (R<sub>1</sub>) has a spin of 1/2. … radicals with the spin-exchange coupling of <i>J/k<sub>B</sub></i> … In order to explore ways to tailor spin-exchange coupling in stacks, five other R<sub>1</sub>/D<sub>25</sub>/R<sub>1</sub>-based alternating stacks with different ligand configurations of R<sub>1</sub> … radical. …

    MATERIALS TRANSACTIONS 57(10), 1680-1684, 2016

    J-STAGE

  • Asymmetric Total Synthesis of Crotophorbolone: Construction of the 5/7/6-Fused Ring System via an α-Alkoxy Bridgehead Radical Reaction

    Urabe Daisuke , Asaba Taro , Inoue Masayuki

    … Nucleophilic addition of the three-carbon unit to the C-ring and stereoselective attachment of the five-membered A-ring through the π-allyl Stille coupling reaction provided the substrate for the key radical cyclization. …

    Bulletin of the Chemical Society of Japan, 2016

    J-STAGE

  • Iron-Catalyzed Enantioselective Cross-Coupling Reactions of α-Chloroesters with Aryl Grignard Reagents

    Jin Masayoshi , Adak Laksmikanta , Nakamura Masaharu

    … The first iron-catalyzed enantioselective cross-coupling reaction between an organometallic compound and an organic electrophile is reported. … The results of radical probe experiments are consistent with a mechanism that involves the formation of an alkyl radical intermediate, which undergoes subsequent enantioconvergent arylation in an intermolecular manner. …

    Journal of the American Chemical Society 137(22), 7128-7134, 2015-05-08

    機関リポジトリ DOI

  • Hydrostannylation-Cross-Coupling Strategy for the Stereoselective Synthesis of Alkylidenemalonates and Related α,β-Unsaturated Esters

    Fujiwara Shinichi , Cadou Romain , Yamaoka Yousuke , Takasu Kiyosei , Yamada Ken-ichi

    … A method for the stereoselective synthesis of alkylidenemalonates and related α, β-unsaturated esters by a hydrostannylation–cross-coupling process has been developed. … Pd-catalyzed and radical hydrostannylation of propiolate derivatives stereoselectively provided α-alkoxycarbonyl (E)- and (Z)-vinylstannanes, respectively, which were then converted into alkylidenemalonates by the Stille coupling reaction. …

    European Journal of Organic Chemistry 2015(6), 1264-1272, 2015-01-12

    機関リポジトリ DOI

  • 樹幹内リグニンの構造分布パターン—スギ樹幹各部より誘導したリグノフェノールの比較—

    浅井 慎史 , 野中 寛 , 舩岡 正光

    樹幹内のリグニン量の分布についての報告は少数あるものの,リグニン高分子構造の分布に関する知見は存在しない.本研究では,50年生スギ樹幹の各部位から採取した木粉を用いて,独自の手法によりリグニン一次分子鎖を高度に保持するリグニン誘導体,リグノフェノールを取得し,樹幹内水平方向,繊維方向で,リグニン構造の分布パターン解析を行った.その結果,樹幹内において高分子リグニンのシームレスな構造変化が確認され, …

    高分子論文集 72(12), 721-725, 2015

    J-STAGE

  • 樹幹内リグニンの構造分布パターン—スギ樹幹各部より誘導したリグノフェノールの比較—

    浅井 慎史 , 野中 寛 , 舩岡 正光

    樹幹内のリグニン量の分布についての報告は少数あるものの,リグニン高分子構造の分布に関する知見は存在しない.本研究では,50年生スギ樹幹の各部位から採取した木粉を用いて,独自の手法によりリグニン一次分子鎖を高度に保持するリグニン誘導体,リグノフェノールを取得し,樹幹内水平方向,繊維方向で,リグニン構造の分布パターン解析を行った.その結果,樹幹内において高分子リグニンのシームレスな構造変化が確認され, …

    高分子論文集 advpub(0), 2015

    J-STAGE

  • ソフトマテリアル界面における共有結合形成を利用した接着

    関根 智子 , 高島 義徳 , 橋爪 章仁 [他] , 山口 浩靖 , 原田 明

    ボロン酸,およびヨードアリールをそれぞれの側鎖に有した高分子ゲルは,金属触媒を添加することにより接着した.これは高分子ゲル界面における鈴木・宮浦クロスカップリング反応によるものであり,ソフトマテリアルの界面で共有結合が形成され,二つの材料を接着することができた.このような材料間の接着は他の化学反応にも適用できる.銅触媒を用いたアジド–アルキン環化付加反応(CuAAC反応)や薗頭クロスカップリング反 …

    高分子論文集 72(10), 590-596, 2015

    J-STAGE

  • ソフトマテリアル界面における共有結合形成を利用した接着

    関根 智子 , 高島 義徳 , 橋爪 章仁 , 山口 浩靖 , 原田 明

    ボロン酸,およびヨードアリールをそれぞれの側鎖に有した高分子ゲルは,金属触媒を添加することにより接着した.これは高分子ゲル界面における鈴木・宮浦クロスカップリング反応によるものであり,ソフトマテリアルの界面で共有結合が形成され,二つの材料を接着することができた.このような材料間の接着は他の化学反応にも適用できる.銅触媒を用いたアジド–アルキン環化付加反応(CuAAC反応)や薗頭クロスカップリング反 …

    高分子論文集 advpub(0), 2015

    J-STAGE

  • Radical-Mediated Three-Component Reaction: A Study toward the Total Synthesis of Resiniferatoxin

    Urabe Daisuke

    … This review summarizes the efforts to develop a radical-mediated three-component reaction and its application to a convergent approach to synthesize the 5/7/6-tricyclic framework (ABC-rings) of the densely functionalized dephnane diterpene, resiniferatoxin. … The α-alkoxy bridgehead radical species, which was designed as the radical donor of the three-component reaction, was generated from O,Se- and O,Te-acetals under two different conditions. …

    Chemical and Pharmaceutical Bulletin 63(8), 565-572, 2015

    J-STAGE

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