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Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Ura, Yasuyuki,Tsujita, Hiroshi,Mitsudo, Take-Aki,Kondo, Teruyuki Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(η6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetrahydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(η4-cod)(η6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(η6-cot)(η2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(η6-cot)(η2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(η6-cot)(η2-dmfm)2 catalyst in the presence of primary alcohols.
Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Yasuyuki Ura,Hiroshi Tsujita,Take-aki Mitsudo,Teruyuki Kondo* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(h6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetra-hydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(h4-cod)(h6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(h6-cot)(h2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(h6-cot)(h2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(h6-cot)(h2-dmfm)2 catalyst in the presence of primary alcohols.
Microscopic control ofSi29nuclear spins near phosphorus donors in silicon
Jä,rvinen, J.,Zvezdov, D.,Ahokas, J.,Sheludyakov, S.,Vainio, O.,Lehtonen, L.,Vasiliev, S.,Fujii, Y.,Mitsudo, S.,Mizusaki, T.,Gwak, M.,Lee, SangGap,Lee, Soonchil,Vlasenko, L. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.12
Song, Myeonghun,Jeong, Minki,Kang, Byeongki,Lee, Soonchil,Ueno, Tomohiro,Matsubara, Akira,Mizusaki, Takao,Fujii, Yutaka,Mitsudo, Seitaro,Chiba, Meiro IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.20
<P>We present the spin dynamics of isolated donor electrons in phosphorus-doped silicon at low temperature and in a high magnetic field. We performed a steady-state electron spin resonance (ESR) on the sample with a dopant concentration of 6.5 × 10<SUP>16</SUP> cm<SUP> − 3</SUP> in a high field of 2.87 T (80 GHz) and at temperatures from 48 down to 1.8 K. As the temperature decreases below 16 K, the resonance spectral line changes from the usual derivative form characteristic of absorptions. Very long spin–lattice relaxation time <I>T</I><SUB>1</SUB> at low temperature gives rise to rapid passage effects and results in a dramatic change in the line shape and intensity as a function of temperature. We show that the numerical analysis based on the passage effects well explains the observed spectral changes with temperature. The spin–lattice relaxation time <I>T</I><SUB>1</SUB> is derived by numerical fit to the experimental data. We discuss the dynamic nuclear polarization of <SUP>31</SUP>P nuclear spins which shows up as asymmetric intensities of the hyperfine-split ESR resonance lines.</P>