A5050211807- Organic and Molecular Conductors Research
- Molecular spectroscopy and chirality
- Organic Chemistry Cycloaddition Reactions
- Asymmetric Synthesis and Catalysis
- Analytical Chemistry and Chromatography
- Oxidative Organic Chemistry Reactions
- Magnetism in coordination complexes
- Synthesis of β-Lactam Compounds
- Porphyrin and Phthalocyanine Chemistry
- Fluorine in Organic Chemistry
- Crystallization and Solubility Studies
- Crystal structures of chemical compounds
- Chemical Synthesis and Analysis
- Chemical Synthesis and Reactions
- Synthesis and Catalytic Reactions
- Axial and Atropisomeric Chirality Synthesis
- Crystallography and molecular interactions
- Gamma-ray bursts and supernovae
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Organic Electronics and Photovoltaics
- Chemical Reactions and Mechanisms
- Radical Photochemical Reactions
- Solid-state spectroscopy and crystallography
- Sulfur-Based Synthesis Techniques
National Institute of Technology, Kurume College
2018-2023
University of the Andes
2021
Ehime University
2000-2016
Hiroshima University
1986-2014
Centre for Research in Engineering Surface Technology
2008
Okayama University of Science
2000-2003
University of Zagreb
2000
Hokkaido University of Education
1999
Nagoya Institute of Technology
1999
Tokyo Institute of Technology
1999
We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of light curve is $\Delta m_{15}(B)=0.65\pm 0.03$, which one slowest among SNe Ia. peak $V$-band absolute magnitude $M_{V}=-19.90\pm 0.15$ mag even if host extinction $A_{V}=0$ mag. It reaches $M_{V}=-20.19\pm 0.19$ $A_{V}=0.29$ as inferred from observed Na {\sc i} D line absorption host. Our $JHK_{s}$-band photometry shows that SN most...
We report that the optical polarization in afterglow of GRB 091208B is measured at t = 149–706 s after burst trigger, and degree P 10.4{ ± 2.5%. The light curve this time shows a power-law decay with index −0.75 0.02, which interpreted as forward shock synchrotron emission, thus first detection early-time (rather than reverse reported by Steele et al.). This disfavors model magnetic fields emission region are random on plasma skin depth scales, such those amplified instabilities, e.g.,...
We present optical and near-infrared multi-band linear polarimetry of the highly reddened Type Ia supernova (SN) 2014J that appeared in M82. SN exhibits large polarization at shorter wavelengths, e.g., 4.8% B band, which decreases rapidly longer while position angle remains approximately 40° over observed wavelength range. These polarimetric properties suggest is likely predominantly caused by interstellar dust within Further analysis shows peaks a wavelengths much than those obtained for...
Mixing of powdered (-)- and (+)-enantiomer crystals in the solid state gives racemic compound. This crystal formation was followed by IR spectral measurement a 1∶1 mixture as Nujol mull. As proceeds, OH absorptions enantiomer disappear gradually new due to compound appear. The from has been studied for various kinds chiral compounds: 2,2′-dihydroxy-1,1′-binaphthyl (1) its derivatives, 10,10′-dihydroxy-9,9′-biphenanthryl (4), 2,2′-dihydroxy-4,4′,6,6′-tetramethylbiphenyl (5)...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnantioselective Photocyclization of 2-Arylthio-3-methylcyclohexen-1-ones to Dihydrobenzothiophene Derivatives in an Inclusion Crystal with Optically Active HostFumio Toda, Hisakazu Miyamoto, Shiro Kikuchi, Reiko Kuroda, and Fuji NagamiView Author Information Department Applied Chemistry, Faculty Engineering Ehime University, Matsuyama, 790, Japan Life Sciences, Graduate School Arts The University Tokyo, Komaba, Meguro-ku, Tokyo 153, Cite...
Abstract The title heteroarene (TBD) isoelectronic with perylene was synthesized by way of a dimerization thieno[2,3-b]thiophene. In addition, 1,4,5,8-tetramethyl, tetraethyl, tetrakis (methylthio), and (ethylthio) derivatives were readily obtained from TBD. An X-ray crystallographic analysis TBD demonstrated that the molecular structure is quite planar symmetrical, but strained in bond angles. crystal comprises herringbone-type column stacking intercolumnar heteroatomic interactions. showed...
Although diphenylacetic acid (1) and aza aromatic compounds such as phenanthridine (2) acridine (3) are achiral molecules, chiral bimolecular crystals 1·2 1·3 were obtained by recrystallization from the solutions. A 1:1 hydrogen bonding between 1 2 or 3 is formed in crystal lattice. Spontaneous crystallization gave two enantiomorphous of M- P-form. The absolute configuration P-1·2 could be determined Bijvoet method using anomalous dispersion an oxygen atom during X-ray analysis. chirality...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT1:1 and 2:1 Inclusion Complexes of (R,R)-(−)-trans-2,3-Bis(hydroxydiphenyl- methyl)-1,4-dioxaspiro[4.4]nonane with N-Allylfuran-2-carboxanilide Which upon Irradiation in the Solid State Give (−)- (+)-Photocyclization Products, RespectivelyFumio Toda, Hisakazu Miyamoto, Kazuyuki KanemotoView Author Information Department Applied Chemistry, Faculty Engineering, Ehime University, Matsuyama, 790, Japan Cite this: J. Org. Chem. 1996, 61, 19,...
Abstract By grinding tetracyanoquinodimethane and tetrathiafulvalene or tetrathianapthacene powders, the corresponding charge-transfer complexes were formed, which showed similar electrical conductivity to those prepared by a recrystallization method.
A variety of N,N- diisopropylarylgIyoxylamides formed chiral crystals in which the originally symmetrical molecules were arranged a form. Photoreaction gave optically active β-lactam derivatives.
Abstract The addition of ethynylbenzene to ketones proceeded efficiently in the absence a solvent give tertiary alkynols good yields.
The planar, centrosymmetric compound 1 is a promising electron-donating component for the synthesis of organic metals. Produced in up to 14 % yield by reductive dimerization dibromothienothiophene, can be reversibly oxidized electrochemically conducting polymer (κ = 0.06 S cm−1). In 1:1 ratio with iodine it also forms complex (0.11 cm −1).
The molecules of N,N-diisopropylarylglyoxylamides, 1, are converted into the corresponding β-lactams, 2, on exposure to UV light in solid state. However, chemical and optical yields photocyclization quite different among crystals. crystal structures three positional isomers 1a–c as reactants photoproduct 2b derived from 1b determined by X-ray structure analysis: (1a)o-chlorophenyl-N,N: diisopropylglyoxylamide; (1b)m-chlorophenyl-N,N-diisopropylglyoxylamide;...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome enantioselective photocyclization reactions in inclusion crystals with optically active host compoundsFumio Toda, Hisakazu Miyamoto, Koichi Takeda, Rikiya Matsugawa, and Nobuyuki MaruyamaCite this: J. Org. Chem. 1993, 58, 23, 6208–6211Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November...
The Vilsmeier–Haack type formylations on various 6-aryl-1,4-dithiafulvenes were examined. furyl derivatives treatment with an excess of POCl<sub>3</sub> in DMF at room temperature mainly afforded dialdehydes substituted the 6-position and furan ring, while thienyl phenyl gave monoformylated 6-position. obtained mono- converted into monoaryl-substituted 2,2′-ethanediylidene-bis(1,3-dithiole) heteroaromatic ring-inserted [3]dendralene triple 1,3-dithiol-2-ylidenes their TTF-fused analogues....
Irradiation of inclusion crystals 2-(N-acyl-N-alkylamino)cyclohex-2-enones and N,N-dimethylphenylglyoxylamide with chiral host molecules gave the optically active N-alkyl-1-azaspiro[3.5]-nonane-2,5-diones 3-hydroxy-1-methyl-3-phenylazetidin-2-one, respectively. The crystal structure 1:1 complex (-)-trans-1,4-bis[3-(o-chlorophenyl)-3-hydroxy-3-phenylprop-1-ynyl]-2,3,5,6- tetrachloro-2,5-cyclohexadiene-1,4-diol was analyzed by X-ray diffraction.
Abstract X-Ray structure analyses of the inclusion complexes indicated that high stereo- and enantioselectivities in photocyclization cyclohex-1-enecarboic acid methyl-phenyl-amide (3), N-methyl, N-{(E)-methylmethacryloyl}anilide (5), N-(methacryloyl)anilide (8), N-ethyl-N-methylbenzoylformamide (10) are result their chiral conformations clathrate crystalline environment with title hosts [(-)-1 (-)-2, respectively]. The chirality acrylanilides benzoylformamide can be by sign torsion angle...
Photoirradiation of powdered inclusion crystals the title compounds with chiral host derived from tartaric acid in a water suspension give optically active [2 + 2] photocyclisation products.
The steric course of the photocyclization reaction title achiral compounds (1) to optically active trans-dihydrofuran derivatives (2) was controlled by carrying out in inclusion crystals (4) with hosts (3) derived from tartaric acid. mechanism enantioselective 1 4 studied X-ray structural analysis 4. In some cases, photoreaction different depending on whether prepared recrystallization or mixing and 3.
Enantioselective reaction of N-methyl-N-phenyl-3-amino-2-cyclohexen-1-one derivatives to the corresponding N-methylhexahydro-4-carbazolones has been accomplished by photolysis in a water suspension 1:1 inclusion compounds starting material with optically active host derived from tartaric acid. 3-(N-Methylanilino)-2,5,5-trimethyl-2-cyclohexen-1-one formed two kinds dimorphous crystals, and one these gave an carbazolone derivative photolysis, but other was photochemically inert. X-ray...
N-Ethyl-N-isopropylphenylglyoxylamide (3c) forms chiral crystal in which its achiral molecules are arranged a form, and the chirality was identified by measurement of CD spectrum Nujol mull. Generation occurs twisting CO−CO bond 3c crystal. Photoirradiation solid state gave optically active β-lactam derivative (4c) 80% ee. By X-ray analysis, absolute configurations 4c were elucidated. The also inclusion complexes with hosts such as...
Abstract Novel dendralene type cross-conjugate molecules based on 1,3-dithiol-2-ylidene units with thiophene have been prepared. The conjugation in the oxidized stage is mainly through core, while cross-conjugated nature observed neutral state. CT complex of 2a TCNQF4 shows moderated electrical conductivity 10−4 S cm−1.