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61.
62.
Kuniaki Tatsuta Yoshiya Amemiya Yoshinobu Kanemura Mitsuhiro Kinoshita 《Tetrahedron letters》1981,22(40):3997-4000
The total synthesis of tyionolide, a 16-membered-ring aglycone of a macrolide antibiotic, tyiosin, has been accomplished by coupling two segments of C1-C10 and C11-C17 portions, which are stereospecifically derived from D-glucose. 相似文献
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65.
Atsushi Sudo Yoshiya Shibata Ayano Miyamoto 《Journal of polymer science. Part A, Polymer chemistry》2013,51(18):3956-3963
A bisketal of myo‐inositol was used as a diol‐type monomer for synthesis of polyurethanes. The monomer was obtained by treatment of myo‐inositol with 1,1‐dimethoxycyclohexane in the presence of p‐toluenesulfonic acid as a catalyst. The ketalization resulted in the formation of a 5‐6‐5‐fused ring system, which endowed the diol‐type monomer with high rigidity. The diol readily reacted with diisocyanate to give the corresponding polyurethane, which exhibited excellent heat resistance due to the rigid 5‐6‐5 system in the main chain. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 3956–3963 相似文献
66.
Terminal alkynes react with allylamine in the presence of a RhCl(PPh3)3 catalyst to give (E)-3-alkylidene-3,4-dihydro-2H-pyrroles. The products consist of two molecules of alkyne and one molecule of allylamine. Although dimers, trimers, and oligomers of alkynes are also obtained as byproducts, the addition of various ammonium salts to the reaction suppresses such oligomerization, resulting in an increase in product. 相似文献
67.
Yoshiya ODA 《色谱》2000,18(6)
1 IntroductionMorethanhalfoftheorganiccompoundsmarketedasdrugsareasymmetricmolecules .Theenantiomersofdrugs ,whichhaveachiralcenteroften ,havedifferentpharmacologicalactivityortoxicity ,owingtodifferencesinthebehaviorofenantiomersinvivo .Recently ,enantiom… 相似文献
68.
Kazuki Komatsu Koji Munakata Kazuyuki Matsubayashi Yoshiya Uwatoko Yoshihiko Yokoyama Kazumasa Sugiyama 《高压研究》2015,35(3):254-262
Zirconium-based bulk metallic glass (Zr-based BMG) has outstanding properties as a cylinder material for piston-cylinder high pressure apparatuses and is especially useful for neutron scattering. The piston-cylinder consisting of a Zr-based BMG cylinder with outer/inner diameters of 8.8/2.5?mm sustains pressures up to 1.81?GPa and ruptured at 2.0?GPa, with pressure values determined by the superconducting temperature of lead. The neutron attenuation of Zr-based BMG is similar to that of TiZr null-scattering alloy and more transparent than that of CuBe alloy. No contamination of sharp Bragg reflections is observed in the neutron diffraction pattern for Zr-based BMG. The magnetic susceptibility of Zr-based BMG is similar to that of CuBe alloy; this leads to a potential application for measurements of magnetic properties under pressure. 相似文献
69.
Ohgushi K Yamamoto A Kiuchi Y Ganguli C Matsubayashi K Uwatoko Y Takagi H 《Physical review letters》2011,106(1):017001
We have successfully synthesized a new rhenium-based hexagonal bronze material, HgxReO3, which exhibits superconductivity with the transition temperature Tc=7.7 K at ambient pressure and 11.1 K at 4 GPa. This compound is a superconductor with the highest Tc among hexagonal bronzes. Moreover, it presents the novel crystallographic feature that (Hg2)2+ polycations, in contrast to monatomic cations in known hexagonal bronzes, are incorporated into open channels. There is evidence that conducting electrons tightly couple with Hg-related phonons. Our results inspire detailed studies on the role of the rattling phonon in the occurrence of superconductivity in the hexagonal bronzes. 相似文献
70.
Kohdai Fujimoto Takahiro Sakurai Susumu Okubo Hitoshi Ohta Kazuyuki Matsubayashi Yoshiya Uwatoko Kazutaka Kudo Yoji Koike 《Applied magnetic resonance》2013,44(8):893-898
A hybrid-type piston-cylinder pressure cell for the electron spin resonance (ESR) measurement has been developed. The cylinder of this pressure cell consists of a NiCrAl inner cylinder and a CuBe outer sleeve, and all inner parts are made of zirconium oxide which has good transmittance to the millimeter and submillimeter waves. We confirmed that the pressure reaches 2.1 GPa. We have also developed a transmission-type high-field ESR system having two different modulation methods for this pressure cell. A test measurement without pressure cell for the two-dimensional orthogonal-dimer spin system of SrCu2(BO3)2 has been done successfully in the wide frequency region. The combination of this electromagnetic wave transmission-type pressure cell and this high-field ESR system is a promising tool for the study of the pressure-induced phase transition of SrCu2(BO3)2. 相似文献