Creat membership Creat membership
Sign in

Forgot password?

Confirm
  • Forgot password?
    Sign Up
  • Confirm
    Sign In
home > search

Now showing items 1 - 13 of 13

  • Electrorheological Properties of Dual Frequency Liquid Crystal in Smectic A Phase

    Matsuoka, Narumi   Kaneko, Kosuke   Kaneko, Kimiyoshi   Takikawa, Yoshinori   Fukao, Koji   Hanasaki, Tomonori  

    In this study, a dual frequency liquid crystal (DFLC) consisting of low molecular weight liquid crystals (LCs) was newly prepared, and the electrorheological (ER) properties were investigated. The liquid crystalline properties of the mixture were analyzed by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD), and the results revealed that the mixture exhibited a smectic A phase. The DFLC mixture showed the ER effects by switching the frequencies, and the change in the viscosity was found to be affected by the given frequencies. Interestingly, the ER effect in the smectic A phase was different from the one observed in the nematic phase.
    Download Collect
  • Electrorheological Properties of Dual Frequency Liquid Crystal in Smectic A Phase

    Matsuoka, Narumi   Kaneko, Kosuke   Kaneko, Kimiyoshi   Takikawa, Yoshinori   Fukao, Koji   Hanasaki, Tomonori  

    Download Collect
  • Synthesis of alpha-2-deoxy-ulosides by Michael addition of hex-1-en-3-ones

    Lin, Zi-Ping   Wong, Fung Fuh   Chen, Yen-Bo   Lin, Yu-Cheng   Kimura, Masayuki   Kaneko, Kimiyoshi   Takayama, Hiroyuki   Wu, Jin Bin   Lin, Chun-Hung   Lin, Hui-Chang  

    alpha-2-Deoxyulosides were synthesized in moderate to good yields by Michael addition of various O-nucleophiles to hex-1-en-3-ones in the presence of NaOH. These glycosyl additions were complete in 30 min at room temperature with high alpha-stereoselectivity in 53-92% yield. In addition, high alpha-stereoselectivity was also observed when S-nucleophiles were examined at 0 degrees C for 90 min. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
    Download Collect
  • METHOD FOR SYNTHESIZING COMPOUND AND CATALYST FOR SYNTHESIS REACTION

    A palladium-containing perovskite-type composite oxide represented by general formula (1) is used as a synthesis reaction catalyst in a Suzuki coupling reaction: Ln2MyCu1-x-yPdxO4 ±δ (1) wherein Ln represents elements comprising at least one essential element selected from La, Pr, Nd, Sm, Eu, and Gd and at least one optional element selected from Y, Ce, Yb, Ca, Sr, and Ba; M represents at least one element selected from Cr, Mn, Fe, Co, Ni, and Al; x, indicating atomic proportion, is 0.001≤x≤0.4; y, indicating atomic proportion, is 0≤y≤0.5; and δ indicates an oxygen excess or oxygen deficiency.
    Download Collect
  • Palladium-catalyzed dehalogenation of 5-halopyrazoles

    Chen, Chun-Yen   Huang, Yu-Ying   Su, Wei-Nien   Kaneko, Kimiyoshi   Kimura, Masayuki   Takayama, Hiroyuki   Wong, Fung Fuh  

    A new and efficient method for the dehalogenation of 5-halopyrazoles was developed by using the catalytic amount of palladium (II) chloride and triphenylphosphine as a ligand at reflux under constant flow of hydrogen gas. The reaction gave the corresponding pyrazole products in good to excellent yields (=83%). J. Heterocyclic Chem., (2012).
    Download Collect
  • New investigation of Vilsmeier-type reaction using pyrazolones with various amides

    Huang, Yu-Ying   Kaneko, Kimiyoshi   Takayama, Hiroyuki   Kimura, Masayuki   Wong, Fung Fuh  

    New investigation of Vilsmeier-type reaction was evaluated to realize the solvent effect by using pyrazolones to react with various of amides, including formamide, N-methylformamide, N-propylformamide, N-tert-butylformamide, N,N-dimethylformamide (DMF), N,N-diethylformamide (DEF), N,N-dipropylformamide (DPF), N,N-diisopropylformamide, N,N-dibutylformamide, piperidine-l-carbaldehyde, and pyrrolidine-l-carbaldehyde, in the presence of phosphorous oxychloride POCl(3). The unexpected resulting products were observed in this work according to the difference chemoseletivities of substituted amides. The plausible reactive pathways were proposed to explain the experimental result. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
    Download Collect
  • One-pot synthesis and antiproliferative evaluation of pyrazolo[3,4-d]pyrimidine derivatives

    Huang, Yu-Ying   Wang, Li-Ya   Chang, Chun-Hsi   Kuo, Yueh-Hsiung   Kaneko, Kimiyoshi   Takayama, Hiroyuki   Kimura, Masayuki   Juang, Shin-Hun   Wong, Fung Fuh  

    An efficient one-pot methodology for the synthesis of pyrazolo[3,4-d]pyrimidines was developed by using 5-aminopyrazoles with formamide in presence of PBr3 as the coupling agent. Among the examples presented in this work, compounds 41 and 54-56 with phenyl or 2-quinolinyl groups at N-1 and p-Me-Ph, p-Cl-Ph, or p-OMe-Ph group at C-3 position in the pyrazole ring possessed better potency against NCl-H226 and NPC-TW01 cancer cells with GI(50) values between 18 mu M and 39 mu M. (c) 2012 Elsevier Ltd. All rights reserved.
    Download Collect
  • Synthesis and antiproliferative evaluation of N,N-disubstituted-N '-[1-aryl-1H-pyrazol-5-yl]-methnimidamides

    Cheng, Kaung-Min   Huang, Yu-Ying   Huang, Jiann-Jyh   Kaneko, Kimiyoshi   Kimura, Masayuki   Takayama, Hiroyuki   Juang, Shin-Hun   Wong, Fung Fuh  

    A series of N,N-disubstituted-N'-[1-aryl-1H-pyrazol-5-yl]-methnimidamides was synthesized by a newly developed microwave reaction and their antiproliferative activities were evaluated. Microwave irradiation of 5-amino-1,3-disubstituted pyrazoles with various amide solvents in the presence of POCl(3) provided the corresponding 2a-2k, 3a-3c, and 4a-4f in good to excellent yields. The obtained methnimidamides were tested against NCI-H661, NPC-TW01, and Jurkat cancer cell lines and the results indicated that compounds 2d and 2e were the most potent with IC(50) values in low micromolar range. (C) 2010 Elsevier Ltd. All rights reserved.
    Download Collect
  • Intelligent catalyst having the self-regenerative function of Pd, Rh and Pt for automotive emissions control

    Tanaka, Hirohisa   Uenishi, Mari   Taniguchi, Masashi   Tan, Isao   Narita, Keiichi   Kimura, Mareo   Kaneko, Kimiyoshi   Nishihata, Yasuo   Mizuki, Jun'ichiro  

    The self-regenerative function of precious metals in the intelligent catalyst is an epoch-making technology in the history of automotive catalysts after the 1970's. The mechanism of the self-regenerative function is studied by X-ray absorption fine-structure (XAFS) analyses. The function was realized through a cyclic movement of Pd between the outside (as Pd nanoparticles) and the inside (as Pd cations in the lattice) of the perovskite crystal in synchronization with the inherent fluctuations between reductive and oxidative (redox) atmospheres that occur in real automotive exhaust gases. As the result, the growth of Pd particles can be suppressed during the entire lifetime of the vehicle. Moreover, the speed of this function was measured at the time resolution of a 10 ms by in situ energy dispersive XAFS, and it is proved that the self-regenerative function occurs at an extremely high speed. Furthermore, the new perovskite catalysts which have the self-regenerative function of Rh and Pt, as well as Pd, are discussed here. This self-regenerative function provides a new and useful tool for designing the future catalyst technology. (C) 2006 Elsevier B.V. All rights reserved.
    Download Collect
  • Design and phase transition behavior of siloxane-based monomeric and dimeric liquid crystals bearing cholesteryl mesogenic groups

    Katsuki, Kaito   Kaneko, Kosuke   Kaneko, Kimiyoshi   Kato, Riki   Miyamoto, Nobuyoshi   Hanasaki, Tomonori  

    A series of siloxane-based monomeric and dimeric liquid crystals (LCs) bearing cholesteryl mesogenic groups were newly synthesized and their phase transition behavior was investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). All the siloxane-based LCs obtained in this study showed a smectic A phase in a wide temperature range. Among the siloxane-based LCs obtained, only the dimeric LC with a shortest siloxane unit at a central part of a spacer was found to exhibit a chiral nematic phase and a blue phase in addition to the smectic A phase. The difference in the thermal properties of the siloxane-based dimeric LCs was investigated in terms of their conformations. Furthermore, the results obtained for the siloxane-based LCs were discussed with comparing with those of homologues having the normal alkyl chains and spacers. (c) 2019 Elsevier B.V. All rights reserved.
    Download Collect
  • Design and phase transition behavior of siloxane-based monomeric and dimeric liquid crystals bearing cholesteryl mesogenic groups

    Katsuki, Kaito   Kaneko, Kosuke   Kaneko, Kimiyoshi   Kato, Riki   Miyamoto, Nobuyoshi   Hanasaki, Tomonori  

    Download Collect
  • Synthesis and antiproliferative evaluation of 3,5-disubstituted 1,2,4-triazoles containing flurophenyl and trifluoromethanephenyl moieties

    Wang, Li-Ya   Tseng, Wen-Che   Wu, Tian-Shung   Kaneko, Kimiyoshi   Takayama, Hiroyuki   Kimura, Masayuki   Yang, Wen-Chin   Bin Wu, Jin   Juang, Shin-Hun   Wong, Fung Fuh  

    An efficient 1,3-dipolar cycloaddition method was performed for the synthesis of a series of monofluoroand trifluoromethane-3,5-disubstituted 1,2,4-triazoles. This efficient cycloaddition method was to react hydrazonoyl hydrochlorides with a series of aldehydes in the presence of NEt(3) as catalytic basic agent to provide the corresponding product in 28-94%. Their growth inhibitory results against cancer cells indicated that some of the fluorine-and trifluoromethane-containing compounds could effectively inhibit the growth of NCI-H226 and T-cell leukemia (Jurkat) cells. Among the compounds, trifluoromethane-containing 1,2, 4-triazoles possessed the five-membered ring groups on the C-5 position of the triazolic ring, including cyclopentyl, 3-furyl, 3-thienyl, and 2-pyrrolyl, possessed the significant inhibitory activity for NCI-H226 cancer cells. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
    Download Collect
  • Regioselectivity of the amino-Claisen rearrangement. The rearrangements of N-allyl-9-methoxy-1-oxajulolidinium bromide and N-allyl-8-methoxylilolidinium bromide

    Kaneko, Kimiyoshi   Katayama, Hajime   Saito, Yumiko   Fujita, Noboru   Kato, Akira  

    Download Collect
1

Contact

If you have any feedback, Please follow the official account to submit feedback.

Turn on your phone and scan

Submit Feedback