Oxford University Press (OUP)

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Factors Affecting the Unusual Reactivity Order in the β-Hydrogen Abstraction of Dialkylzirconocenes
Oxford University Press (OUP) - Tập 21 Số 12 - Trang 2367-2370 - 1992
Ei‐ichi Negishi, Thinh Nguyen, John Paul Maye, Daniele Choueiri, Noriyuki Suzuki, Tamotsu Takahashi
Abstract Competitive β-hydrogen abstraction of “mixed” dialkylzirconocenes and kinetic measurements of decomposition of methyl(alkyl)zirconocenes reveal unexpected relative reactivity of alkyl groups as β-hydrogen donors, such as s-Bu > t-Bu ≥ Et > n-Bu > i-Bu, which correlate well in most cases with the reactivity order of: β-me...... hiện toàn bộ
Zirconacyclopropanes and Zirconacyclopropenes. Their Synthesis, Characterization, and Reactions
Oxford University Press (OUP) - Tập 16 Số 4 - Trang 623-626 - 1987
Tamotsu Takahashi, Douglas R. Swanson, Ei‐ichi Negishi
Abstract Zirconacyclopropenes represented by Cp2Zr(PhCCPh) (PR3) (4), where PR3 is PMe3 or PMePh2, have been prepared by the reaction of Cp2Zr(PR3)2 with PhC≡CPh, isolated as yellowish crystals, and spectroscopically characterized. Zirconacyclopropenes readily react with proton donors, carbonyl compounds, e.g., acetone, and alkynes to induce dimeriza...... hiện toàn bộ
Highly Conductive Room Temperature Molten Salts Based on Small Trimethylalkylammonium Cations and Bis(trifluoromethylsulfonyl)imide
Oxford University Press (OUP) - Tập 29 Số 8 - Trang 922-923 - 2000
Hajime Matsumoto, Masahiro Yanagida, Kazumi Tanimoto, Masakatsu Nomura, Yukiko Kitagawa, Yoshinori Miyazaki
Abstract The electrochemically stable and relatively high conductive room temperature molten salts (RTMS) have been obtained with the use of small ammonium cations such as methoxymethyltrimethylammonium and bis(trifluoromethylsulfonyl)imide. The RTMS showed high conductivity (4.7 mS cm−1 at 25 °C) which is the highest value of all the ammonium based ...
Facile Synthesis of Group 4–6 Transition Metal Phenoxides and X-Ray Structures of TiCl2[O-2,6-(CH3)2C6H3]2(THF)2 and NbCl3[O-2,6-(CH3)2C6H3]2(THF)
Oxford University Press (OUP) - Tập 19 Số 12 - Trang 2167-2170 - 1990
Nobuko Kanehisa, Yasushi Kai, Nobutami Kasai, Hajime Yasuda, Yuushou Nakayama, K. Takei, Akira Nakamura
Abstract Reactions of Group 4–6 metal halides with 2,6-dimethylphenoxy(trimethyl)silane in THF afford pure compounds of type MX1[O-2,6-(CH3)2C6H3]m(THF)n(M = Ti, Zr, Hf with l = 3, m = 1, n = 2 or l = 2, m = 2, n = 2; M = Nb, l = 4, m = 1, n = 1 or l = 3, m = 2, n = 1; M = W, l = 5, m = 1, n = 0 or l = 4, m = 2, n = 0) in >75% yields. Geometri...... hiện toàn bộ
A NEW SYNTHESIS OF VITAMIN A
Oxford University Press (OUP) - Tập 4 Số 11 - Trang 1201-1202 - 1975
Teruaki Mukaiyama, Akihiko Ishida
Abstract A new synthesis of vitamin A was successfully accomplished by reducing retinal, prepared by the reaction of 3-methyl-1-trimethylsiloxy-1,3-butadiene (III) with β-ionylideneacetaldehyde dimethyl acetal (VII) followed by the elimination of methanol with tertiary amine such as 1,5-diazabicyclo[5.4.0]undecene-5. The intermediate, β-ionylideneace...... hiện toàn bộ
RAMAN SPECTRUM AND THE S–I STRETCHING FREQUENCY OF BENZOYLSULFENYL IODIDE
Oxford University Press (OUP) - Tập 15 Số 6 - Trang 935-938 - 1986
Shinzi Kato, Yukio Komatsu, Toshiaki Murai, Hiro‐o Hamaguchi, Mitsuo Tasumi, Renji Okazaki
Abstract The Raman spectrum of benzoylsulfenyl iodide in ether has been observed for the first time using a high-speed multi-channel Raman spectrometer. The S–I stretching frequency is found to be 387 cm−1, which is useful for the characterization of organosulfur compounds involving the S–I linkage.
Face-on and Columnar Porphyrin Assemblies at Solid/Liquid Interface on HOPG
Oxford University Press (OUP) - Tập 38 Số 6 - Trang 570-571 - 2009
Joe Otsuki, Kazuhiko Namiki, Yuki Arai, Makoto Amano, Hirokazu Sawai, A. Tsukamoto, Toshiki Hagiwara
Abstract Porphyrins having alkyl chains, each of which contains a diacetylene unit, were prepared to examine their self-assembled structures at the liquid/solid interface on graphite. The porphyrins with the longest alkyl chains form a face-on arrangement on the surface, while those with shorter alkyl chains form highly ordered one-dimensional column...... hiện toàn bộ
Selective Nitrous Oxide Oxidation for C-H Oxidation and Aromatization of 9,10-Dihydroanthracene Derivatives
Oxford University Press (OUP) - Tập 31 Số 6 - Trang 582-583 - 2002
Kentaro Hashimoto, Hirotaka Tanaka, Taketo Ikeno, Tohru Yamada
Abstract During the nitrous oxide oxidation of 9,10-dihydroanthracene derivatives catalyzed by the ruthenium-porphyrin complexes, anthraquinones were selectively afforded by the C-H oxidation of the benzylic carbon under the appropriate reaction conditions, whereas anthracenes as a result of oxidative aromatization were selectively obtained in the pr...
Novel Synthesis of FePt Nanoparticles and Magnetic Properties of Their Self-assembled Superlattices
Oxford University Press (OUP) - Tập 33 Số 2 - Trang 130-131 - 2004
Masafumi Nakaya, Yuko Tsuchiya, Kenchi Ito, Yasunori Oumi, Tsuneji Sano, Toshiharu Teranishi
Abstract The novel synthesis of FePt nanoparticle superlattices by polyol reduction of platinum acetylacetonate and iron acetylacetonate is reported. The compositions of FePt nanoparticle are readily controlled, and the particle sizes are not significantly affected by the compositions, retaining to be ca. 3 nm with a very narrow size distribution. Th...... hiện toàn bộ
Nitrous Oxide Oxidation of Secondary and Benzylic Alcohols Using Ruthenium Complex Catalyst
Oxford University Press (OUP) - Tập 30 Số 9 - Trang 922-923 - 2001
Kentaro Hashimoto, Yasunori Kitaichi, Hirotaka Tanaka, Taketo Ikeno, Tohru Yamada
Abstract Catalytic N2O oxidation of various secondary and benzylic alcohols using a ruthenium porphyrin complex is presented. Both secondary and benzylic alcohols were smoothly consumed to give the corresponding ketones and aldehydes in high yields. Nitrous oxide (N2O) is expected to be a new terminal oxidant producing only dinitrogen gas as the only...... hiện toàn bộ
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