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排序方式: 共有135条查询结果,搜索用时 187 毫秒
31.
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The Swern oxidation of acyclic and cyclic α-ketols delivered α-diketones or the tautomeric diosphenols in good yield. 相似文献
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Rare earth metal trifluoromethanesulfonates [rare earth metal triflate, RE(OTf)3] were found to be efficient catalyst for benzyl-etherification. In the presence of a catalytic amount of RE(OTf)3, condensation of benzyl alcohols and aliphatic alcohols proceeded smoothly to afford the benzyl ethers. The condensation between benzyl alcohols and thiols also proceeded, and thio ethers were obtained in good yield. In these reactions, RE(OTf)3 could be recovered easily after the reactions were completed and could be reused without loss of activity. 相似文献
35.
Cobalt Ion-Doped TiO(2) Photocatalyst Response to Visible Light 总被引:1,自引:0,他引:1
Iwasaki M Hara M Kawada H Tada H Ito S 《Journal of colloid and interface science》2000,224(1):202-204
Photocatalytic activity under visible light irradiation was generated by doping a small amount of Co(2+) ions into TiO(2) particles. Nanometer-sized particles with the composition xCoO-(100-x) TiO(2) (xCo/TiO(2); 0=x=6.0) were prepared from TiOSO(4).4.5H(2)O and Co(CH(3)COO)(2).4H(2)O in an ethanol-water solution containing NaOH under reflux. The photoreactivity of xCo/TiO(2) was evaluated by the rate of CH(3)CHO degradation. The Co(2+) ion doping (0.01=x=0.27) not only enhanced the photocatalytic activity under ultraviolet-visible (lambda>300 nm) light irradiation but also induced the visible light (lambda>400 nm) response. The highest photocatalytic activities were obtained at x=0.03 for both irradiations. Copyright 2000 Academic Press. 相似文献
36.
Hideji Komatsu Ryoji Mogi Michio M. Matsushita Tadashi Miyagi Yuzo Kawada Tadashi Sugawara 《Polyhedron》2009,28(9-10):1996-2000
A novel organic donor radical, TSBN, which is a benzotetraselenafulvalene derivative carrying a nitronyl nitroxide group in a cross-conjugated manner was prepared. X-ray crystallographic analysis revealed that TSBN forms a sheet-like network within the ac plane through intermolecular chalcogen contacts. Its spin-polarized structure was confirmed by cyclic voltammogram, ESR spectra of singly oxidized species and DFT calculation. The neutral crystal of TSBN showed nonlinear I–V characteristics at 2 K and exhibited negative magnetoresistance (?5% at 2 K under 5 T). 相似文献
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Tadakatsu Mandai Kazuhito Mori Keisuke Hasegawa Mikio Kawada Junzo Otera 《Tetrahedron letters》1984,25(46):5225-5226
A novel synthetic method for α-methylene-γ-butyrolactones involving a thioallylic rearrangement as a key step was developed. 相似文献
39.
Junzo Nokami Toshiyuki Yamamoto Mikio Kawada Mari Izumi Nobuko Ochi Rokuro Okawara 《Tetrahedron letters》1979,20(12):1047-1048
Malonic acid derivatives(gem-dicarboxylic acids) were converted to the corresponding ketones by the electrolysis. The reaction was employed for the synthesis of jasmones. 相似文献
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