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Akihiko Tsuge Masahiro YokooHiroyoshi Kawasaki Daisaku KanekoTetsuji Moriguchi Koji Araki 《Tetrahedron letters》2013
Dithia[3.3]metacyclophanes which consist of the pyridine unit connecting to the different positions of the parent cyclophane skeleton have been prepared. Conformational change has been observed for the cyclophane having a 4-substituted pyridine unit by binding to the porphyrin. In contrast the porphyrin binding has no influence on conformational behavior of the cyclophane having a 3-substituted pyridine unit. 相似文献
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Nemoto H Ma R Moriguchi H Kawamura T Kamiya M Shibuya M 《The Journal of organic chemistry》2007,72(25):9850-9853
A one-pot method for synthesizing alpha-siloxy-Weinreb amides from aldehydes was developed with use of N,O-dimethylhydroxylamine and a masked acyl cyanide reagent bearing a tert-butyldimethylsilyl group avoiding the competitive reaction toward N-methoxy-N-methyl-2-amino-1-siloxymalononitrile. 相似文献
55.
Kaori Tamaya Sadaaki Moriguchi Kunishige Naito Shinsuke Takei 《Analytical sciences》2006,22(5):715-719
In single-column anion-exchange chromatography, the retention volume of some monovalent inorganic anions (Cl(-), Br(-), NO(3)(-), NCS(-) and NO(2)(-)) were observed as a function of the pH of a mobile phase at a fixed concentration of 2-phenylmalonic acid or 1,4-benzenediacetic acid used as an eluent. The experimental retention volume of such an anion was decreased with an increase in the pH of a mobile phase, and was able to be described by the following equation taking account of anion-exchange equilibria of a sample anion with a hydrogen dicarboxylate ion (HE(-)) and with a dicarboxylate ion (E(2-)): alpha(1s)/V(R)'[HE(-)] = 1/m(T)wK(ex1) + (2K(a2)/m(T)w(2)K(ex2))(V(R)'/alpha(1s)[H(+)]), where V(R)', m(T), w, K(a2), K(ex1) and K(ex2) are the adjusted retention volume of a given sample anion, the capacity for the anion-exchange of column packings and the weight of column packings packed into a separating column, the second acid-dissociation constant of the dicarboxylic acid used as an eluent, and equilibrium constants for the anion exchange of a sample anion with a monovalent hydrogen dicarboxylate ion and with a divalent dicarboxylate ion, respectively. The term alpha(1s), defined as K(as)/([H(+)] + K(as)), where K(as) is the acid-dissociation constant of HX, is the mole fraction of a sample anion, X(-), and is equal to 1 when using a strong acid anion as a sample anion. 相似文献
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Fujimori T Urita K Tománek D Ohba T Moriguchi I Endo M Kaneko K 《The Journal of chemical physics》2012,136(6):064505
We introduce a way to selectively probe local vibration modes at nanostructured asperities such as tips of carbon nanohorns. Our observations benefit from signal amplification in surface-enhanced Raman scattering (SERS) at sites near a silver surface. We observe nanohorn tip vibration modes in the range 200-500 cm(-1), which are obscured in regular Raman spectra. Ab initio density functional calculations assign modes in this frequency range to local vibrations at the nanohorn cap resembling the radial breathing mode of fullerenes. Careful interpretation of our SERS spectra indicates presence of caps with 5 or 6 pentagons, which are chemically the most active sites. Changes in the peak intensities and frequencies with time indicate that exposure to laser irradiation may cause structural rearrangements at the cap. 相似文献
57.
Syn and anti cyclophanes consisting of oligothiophene units as a component have been synthesized for the first time. Correlation between the cyclophane structure and fluorescence spectral properties has been examined. Emission from intramolecular excimer-formation is confirmed for the syn cyclophanes and the mobile cyclophanes, but not for the anti cyclophanes. 相似文献
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