Search results for: Toshio Masuda

Items from 1 to 20 out of 171 results

article

Novel isolated, L‐amino acid‐ligated rhodium catalysts that induce highly helix‐sense‐selective polymerization of an achiral 3,4,5‐trisubstituted phenylacetylene

Hongge Jia, Yongqiang Shi, Liqun Ma, Xuan Gao, more

Journal of Polymer Science Part A: Polymer Chemistry > 54 > 15 > 2346 - 2351

Two novel chiral well‐defined rhodium complexes, Rh(cod)(L‐Phe) (cod = 1,5‐cyclooctadiene, Phe = phenylalanine) and Rh(cod)(L‐Val) (Val = valine) were synthesized, isolated by recrystallization, and characterized. The helix‐sense‐selective polymerization (HSSP) of an achiral 3,4,5‐trisubstituted phenylacetylene, p‐dodecyloxy‐m,m‐dihydroxyphenylacetylene (DoDHPA) was examined by using the two Rh complexes...

article

Inside Cover: Photoinduced Formation of an Azobenzene‐Based CD‐Active Supramolecular Cyclic Dimer (Chem. Eur. J. 18/2015)

Hiromitsu Sogawa, Kayo Terada, Yu Miyagi, Masashi Shiotsuki, more

Chemistry – A European Journal > 21 > 18 > 6634 - 6634

Optically active azobenzenedicarboxylic acid derivatives were synthesized from various amino acids. They reversibly isomerize between trans and cis forms upon irradiation with UV and visible light. The trans isomers are circular dichroism (CD) silent, whereas the cis isomers are CD active due to the formation of chiral supramolecular assemblies based on the bent structures of the cis‐azobenzene moieties...

article

Photoinduced Formation of an Azobenzene‐Based CD‐Active Supramolecular Cyclic Dimer

Hiromitsu Sogawa, Kayo Terada, Yu Miyagi, Masashi Shiotsuki, more

Chemistry – A European Journal > 21 > 18 > 6747 - 6755

A series of new photo‐responsive amino acid‐derived azobenzenedicarboxylic acid derivatives (S)‐1 a–e were synthesized. Compound (S)‐1 a in the trans form exhibited no circular dichroism (CD) signal in DMF under ambient conditions, whereas intense Cotton effects were observed upon UV irradiation, indicating the formation of a chiral supramolecular structure in the cis form. The CD signals disappeared...

article

Controlled Polymerization of Phenylacetylenes Using Well‐Defined Rhodium Catalysts

Fumio Sanda, Masashi Shiotsuki, Toshio Masuda

Macromolecular Symposia > 350 > 1 > 67 - 75

This article deals with (1) the controlled polymerization of an optically active phenylacetylene (PA) derivative using well defined rhodium (Rh) catalyst, [(nbd)Rh{C(Ph)=CPh₂}(PPh₃)] and the study on the molecular weight dependence of the chirality (degree of helix formation and predominance of one‐handed helicity) of the formed polymers, (2) examination of the polymer end structures by matrix‐assisted...

chapter

Polymerization of Substituted Acetylenes

Toshio Masuda, Afang Zhang

Handbook of Metathesis > Volume 3: Polymer Synthesis > 375 - 390

This chapter discusses the metathesis polymerization of substituted acetylenes. Monomers, polymerization catalysts, controlled polymerizations, polymers, and polymer properties are also discussed in the chapter. Recently, many examples of catalysts for living polymerization of substituted acetylenes have been reported. These catalysts are useful for the elucidation of the polymerization mechanism...

article

Synthesis and ion responsiveness of optically active polyacetylenes containing salicylidene Schiff-base moieties

Chunyu Zhang, Yu Zhang, Hexin Zhang, Yanming Hu, more

Reactive and Functional Polymers > 2015 > 87 > Complete > 46-52

Acetylenic monomers containing salicylidene Schiff-base groups (1a and 1b) as well as Schiff-base and hydroxy groups (1c) were synthesized and polymerized with [(nbd)RhCl] ₂ /Et ₃ N catalyst to afford the corresponding polymers 2a–c with high molecular weights (M _n =2.6–7.2×10 ⁵ ) in high yields (75–97%). Polarimetric, circular dichroism (CD), and UV–vis spectroscopic...

article

Synthesis and Helical Structures of Poly(ω‐alkynamide)s Having Chiral Side Chains: Effect of Solvent on Their Screw‐Sense Inversion

Yuji Suzuki, Yu Miyagi, Masashi Shiotsuki, Yoshihito Inai, more

Chemistry – A European Journal > 20 > 46 > 15131 - 15143

New ω‐alkynamides, (S)‐HCCCH₂CONHCH₂CH(CH₃)CH₂CH₃ (1) and (S)‐HCCCH₂CH₂CONHCH(CH₃)CH₂CH₂CH₂CH₂CH₃ (2) were synthesized and polymerized with a rhodium catalyst in CHCl₃ to obtain cis‐stereoregular poly(ω‐alkynamide)s (poly(1) and poly(2)). Polarimetric, CD, and IR spectroscopic studies revealed that in solution the polymers adopted predominantly one‐handed helical structures stabilized by intramolecular...

article

Synthesis, gas permeability, and metal-induced gelation of poly(disubstituted acetylene)s having p,m-dimethoxyphenyl and p,m-dihydroxyphenyl groups

Toshikazu Sakaguchi, Takuya Tsuzuki, Toshio Masuda, Tamotsu Hashimoto

Polymer > 2014 > 55 > 8 > 1977-1983

Diphenylacetylene having a trimethylsilyl group and two methoxy groups [p-(CH₃)₃SiC₆H₄CCC₆H₄-m,p-(OCH₃)₂ (1a)] polymerized with TaCl₅/n-Bu₄Sn catalyst to provide a high-molecular-weight polymer (2a). In contrast, monomers without trimethylsilyl group (1b) and having two t-butyldimethylsiloxy groups (1c) hardly polymerized because of poor solubility of the produced polymer 2b and steric hindrance of...

article

Relationship between the local dynamics and gas permeability of polyacetylenes containing polymethylated indan/tetrahydronaphtalene moieties

Rintaro Inoue, Toshiji Kanaya, Yanming Hu, Toshio Masuda, more

Polymer > 2014 > 55 > 1 > 182-186

Local dynamics of polyacetylenes having polymethylated indan/tetrahydronaphthalene moieties have been studied using quasielastic neutron scattering, and the results obtained have been discussed together with former results with various poly(diphenylacetylene) derivatives. Clear quasielastic scattering was observed for the present polymers although they were in the glassy state, and the observed dynamic...

chapter

Determination of multidimensional hyper potential surface configuration in polyacetylene derivative

Takayoshi Kobayashi, Tsugumasa Iiyama, Kotaro Okamura, Du Juan, more

2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications > 1 - 2

2014 Conference on Lasers and Electro-Optics (CLEO)

We have for the first time obtained multi-dimensional Huang Rhys factors, which determine the potential hypersurface structures in complex polymeric system by observing the transition-energy modulations separately among many modes induced by impulsive excitation.

article

Highly CO2-permeable and -permselective poly(diphenylacetylene)s having imidazolium salts: Synthesis, characterization, gas permeation properties, and effects of counter anion

Toshikazu Sakaguchi, Hyuma Ito, Toshio Masuda, Tamotsu Hashimoto

Polymer > 2013 > 54 > 25 > 6709-6715

Diphenylacetylenes having a 2-bromoethoxy group [p-(BrCH ₂ CH ₂ O)C ₆ H ₄ CCC ₆ H ₄ -p-R; R = SiMe ₃ (1a), H (1c)] were synthesized and then polymerized with TaCl ₅ /n-Bu ₄ Sn catalyst to provide the corresponding poly(diphenylacetylene)s (2a and 2c). These polymers afforded tough free-standing membranes by casting from toluene...

article

Novel Methylaluminoxane‐Activated Neodymium Isopropoxide Catalysts for 1,3‐Butadiene Polymerization and 1,3‐Butadiene/Isoprene Copolymerization

Yanming Hu, Weimin Dong, Toshio Masuda

Macromolecular Chemistry and Physics > 214 > 19 > 2172 - 2180

The homo‐ and copolymerizations of 1,3‐butadiene and isoprene are examined by using neodymium isopropoxide [Nd(Oi‐Pr)₃] as a catalyst, in combination with a methylaluminoxane (MAO) cocatalyst. In the homopolymerization of 1,3‐butadiene, the binary Nd(Oi‐Pr)₃/MAO catalyst works quite effectively, to afford polymers with high molecular weight (

{\overline{M}}_{n}

≈ 10⁵ g mol^‐1), narrow molecular‐weight distribution...

article

Ultrafast electronic relaxation and vibrational dynamics in a polyacetylene derivative

Takayoshi Kobayashi, Tsugumasa Iiyama, Kotaro Okamura, Juan Du, more

Chemical Physics Letters > 2013 > 567 > Complete > 6-13

Real-time vibrational spectra in a polyacetylene derivative, poly[o-TFMPA([o-(trifluoromethyl) phenyl]acetylene)] in a broad electronic spectral region were observed using a sub-7-fs laser. Using the frequencies and initial phases of vibrational modes obtained by the spectroscopy, the assignment of the wavepackets was made. From the first moment, Huang–Rhys parameters were determined for six most...

article

Primer design for identifying economically important Liriomyza species (Diptera: Agromyzidae) by multiplex PCR

Shigeo Nakamura, Toshio Masuda, Atsushi Mochizuki, Kazuhiko Konishi, more

Molecular Ecology Resources > 13 > 1 > 96 - 102

Leafminer flies, especially, Liriomyza huidobrensis,Liriomyza sativae and Liriomyza trifolii, are quarantine species in many countries. Their morphological similarity makes identification difficult. To develop a rapid, reliable, sensitive and simple molecular identification method using multiplex PCR, we newly sequenced the mitochondrial cytochrome oxidase I (COI) genes of Liriomyza bryoniae,Liriomyza chinensis...

article

Virtual Special Issue of Polymer on living and controlled polymerizations dedicated to Axel Müller

S. Richard Turner, Toshio Masuda, Yongming Chen

Polymer > 2012 > 53 > 9 > 1801-1802

article

Fabrication of chemically bonded polyacrylate/silica hybrid films with high silicon contents by the sol–gel method

Wenbo Liao, Haipin Teng, Jinqing Qu, Toshio Masuda

Progress in Organic Coatings > 2011 > 71 > 4 > 376-383

Polyacrylate/silica hybrid latexes (PAES) with high silicon contents (up to 21%) were prepared by directly mixing colloidal silica with polyacrylate emulsion (PAE) modified by a silane coupling agent. Sol–gel-derived organic/inorganic thin films were obtained by addition of hydrophilic co-solvents to PAES and subsequent drying at room temperature. The effects of co-solvents and γ-methacryloxypropyltrimethoxysilane...

article

Preparation and properties of DNA–lipid complexes carrying pyrene and anthracene moieties

Tong Zhang, Jinqing Qu, Naoya Ogata, Toshio Masuda

European Polymer Journal > 2011 > 47 > 3 > 370-377

Novel DNA–lipid complexes carrying pyrene and anthracene were prepared by substituting sodium counter cations with cationic amphiphilic lipids, namely lipid(PY) and lipid(Anth), in which the actual mole ratios of phosphate to lipid were 1:1.11 and 1:1.03, respectively. DNA–lipid(PY) and DNA–lipid(Anth) complexes were soluble in common organic solvents including CHCl ₃ , CH ₂ Cl ...

article

Synthesis and Secondary Structure of Poly(1-methylpropargyl- N -alkylcarbamate)s

Yusuke Shirakawa, Yuji Suzuki, Kayo Terada, Masashi Shiotsuki, more

Macromolecules > 2010 > 43 > 13 > 5575 - 5581

article

Tyrosine-based poly(m-phenyleneethynylene-p-phenyleneethynylene)s. Helix folding and responsiveness to a base

Ruiyuan Liu, Hiromitsu Sogawa, Masashi Shiotsuki, Toshio Masuda, more

Polymer > 2010 > 51 > 11 > 2255-2263

The Sonogashira–Hagihara polymerization of 3′,5′-diiodo-N-α-tert-butoxycarbonyl-l-tyrosine methyl ester (1) and 3′,5′-diiodo-N-α-tert-butoxycarbonyl-O-methyl-l-tyrosine methyl ester (2) with para-diethynylbenzene (3) was carried out to obtain optically active poly(m-phenyleneethynylene-p-phenyleneethynylene)s [poly(1) and poly(2)] with M _n ’s ranging from 9900 to 15,000 in 80–87% yields. Poly(1)...

article

Synthesis and gas permeation properties of various Si-containing poly(diarylacetylene)s and their desilylated membranes

Yanming Hu, Kyohei Hattori, Akito Fukui, Masashi Shiotsuki, more

Polymer > 2010 > 51 > 7 > 1548-1554

Diarylacetylene monomers having trimethylsilyl groups and other substituents (substituted biphenyl, 1a and 1b; trimethylsilylmethylphenyl, 1c–e) were synthesized and polymerized with TaCl ₅ -n-Bu ₄ Sn catalyst to produce the corresponding poly(diarylacetylene)s (2a–d). Polymers 2a–c had high molecular weights and were soluble in common organic solvents. Free-standing membranes of 2a–c...

Publication date

Set your own date range

Content availability

Available (170)
None (1)

Publication type

article (169)
book (2)

Publication language

English (170)
Undetermined (1)

Keywords

GAS PERMEABILITY (14)
POLYACETYLENE (12)
CARBAZOLE (8)
HELIX (8)
SUBSTITUTED POLYACETYLENE (6)
DESILYLATION (5)
METATHESIS POLYMERIZATION (5)
POLY(DIPHENYLACETYLENE) (5)
AMINO ACID (4)
CONJUGATED POLYMER (4)
HYDROGEN BONDING (4)
MEMBRANE (4)
AZOBENZENE (3)
CHIRAL (3)
FLUORESCENCE (3)
LIVING POLYMERIZATION (3)
MEMBRANES (3)
PHENYLACETYLENE (3)
POLYACETYLENES (3)
POLYMERIZATION (3)
PYRENE (3)
SUBSTITUTED ACETYLENE (3)
TRANSITION METAL CATALYST (3)
AMINO ACIDS (2)
CELLULOSE ACETATE (2)
HELICAL POLYMER (2)
HELICAL POLYMERS (2)
ISOPRENE (2)
MOLYBDENUM CATALYST (2)
ORGANIC RADICAL BATTERY (2)
PERMSELECTIVITY (2)
PHOTOLUMINESCENCE (2)
PHOTORESPONSIVENESS (2)
POLY(PHENYLACETYLENE) (2)
ROMP (2)
SUPRAMOLECULAR CHEMISTRY (2)
TRIPHENYLAMINE (2)
UV/VIS SPECTROSCOPY (2)
T-BUME 2 SIO GROUP (1)
1,3‐BUTADIENE (1)
3,4,5‐TRISUBSTITUTED PHENYLACETYLENE (1)
ABSORPTION (1)
AMINO GROUP (1)
ANTHRACENE (1)
BIOMIMETIC (1)
BLOCK COPOLYMERIZATION (1)
CARBAMOYLATION (1)
CARBOXYL GROUP (1)
CATALYSIS (1)
CATALYSTS (1)
CELLULOSE DERIVATIVES (1)
CHARGE/DISCHARGE PROPERTIES (1)
CHARGE–DISCHARGE PROPERTIES (1)
CHIRAL GERMYL GROUP (1)
CHIRALITY (1)
CHIROPTICAL PROPERTY (1)
COLLOIDAL SILICA (1)
CONDENSED AROMATIC RING (1)
CONFORMATION ANALYSIS (1)
COORDINATION POLYMERIZATION (1)
COPOLYMERIZATION (1)
CYCLOOLEFIN (1)
CYTOCHROME OXIDASE SUBUNIT I (1)
DEGRADATION (1)
DELAYS (1)
DIPHENYLACETYLENE (1)
DISUBSTITUTED ACETYLENE POLYMERS (1)
DNA COMPLEXES (1)
DNA-LIPID COMPLEXES (1)
DNA–LIPID COMPLEX (1)
DNA–LIPID COMPLEXES (1)
EDUCATIONAL INSTITUTIONS (1)
ELECTRO-CHEMISTRY (1)
ELECTRO‐OPTICAL PROPERTIES (1)
ETHYL CELLULOSE (1)
GAS PERMEATION (1)
GAS SEPARATION MEMBRANE (1)
GELATION (1)
GEOMETRIC ISOMERIZATION (1)
GLASSY POLYMER (1)
GLUTAMIC ACID (1)
HALOGEN (1)
HELICAL POLYACETYLENE (1)
HELICAL STRUCTURES (1)
HELIX‐SENSE‐SELECTIVE POLYMERIZATION (1)
HETEROJUNCTION (1)
HYDROXYL GROUP (1)
HYPERBRANCHED POLYMER (1)
IMIDAZOLIUM SALT (1)
INVASIVE SPECIES (1)
LEAFMINER FLY (1)
LIPID (1)
L‐AMINO ACID (1)
MALDI‐TOF (1)
METHYLALUMINOXANE (1)
METHYLPROPARGYL ESTER (1)
MITOCHONDRIA (1)
MOLECULAR WEIGHT DISTRIBUTION (1)
MONOSUBSTITUTED ACETYLENE POLYMERS (1)
MULTI‐PRIMERS (1)
more

Data set

ACS (79)
Elsevier (64)
Springer (18)
Wiley (9)
ieee (1)

Journal

Macromolecules (71)
Polymer (41)
Polymer Bulletin (18)
Chemistry of Materials (5)
Journal of Membrane Science (5)
Journal of Molecular Catalysis. A, Chemical (5)
Chemistry – A European Journal (3)
European Polymer Journal (2)
Journal of the American Chemical Society (2)
Macromolecular Chemistry and Physics (2)
Nuclear Inst. and Methods in Physics Research, B (2)
Synthetic Metals (2)
Applied Radiation and Isotopes (1)
Chemical Physics Letters (1)
Inorganica Chimica Acta (1)
Journal of Polymer Science Part A: Polymer Chemistry (1)
Macromolecular Symposia (1)
Molecular Ecology Resources (1)
Organometallics (1)
Progress in Organic Coatings (1)
Progress in Polymer Science (1)
Reactive and Functional Polymers (1)
Science and Technology of Advanced Materials (1)
more

INFONA - science communication portal

Search results for: Toshio Masuda

Novel isolated, L‐amino acid‐ligated rhodium catalysts that induce highly helix‐sense‐selective polymerization of an achiral 3,4,5‐trisubstituted phenylacetylene

Inside Cover: Photoinduced Formation of an Azobenzene‐Based CD‐Active Supramolecular Cyclic Dimer (Chem. Eur. J. 18/2015)

Photoinduced Formation of an Azobenzene‐Based CD‐Active Supramolecular Cyclic Dimer

Controlled Polymerization of Phenylacetylenes Using Well‐Defined Rhodium Catalysts

Polymerization of Substituted Acetylenes

Synthesis and ion responsiveness of optically active polyacetylenes containing salicylidene Schiff-base moieties

Synthesis and Helical Structures of Poly(ω‐alkynamide)s Having Chiral Side Chains: Effect of Solvent on Their Screw‐Sense Inversion

Synthesis, gas permeability, and metal-induced gelation of poly(disubstituted acetylene)s having p,m-dimethoxyphenyl and p,m-dihydroxyphenyl groups

Relationship between the local dynamics and gas permeability of polyacetylenes containing polymethylated indan/tetrahydronaphtalene moieties

Determination of multidimensional hyper potential surface configuration in polyacetylene derivative

Highly CO2-permeable and -permselective poly(diphenylacetylene)s having imidazolium salts: Synthesis, characterization, gas permeation properties, and effects of counter anion

Novel Methylaluminoxane‐Activated Neodymium Isopropoxide Catalysts for 1,3‐Butadiene Polymerization and 1,3‐Butadiene/Isoprene Copolymerization

Ultrafast electronic relaxation and vibrational dynamics in a polyacetylene derivative

Primer design for identifying economically important Liriomyza species (Diptera: Agromyzidae) by multiplex PCR

Virtual Special Issue of Polymer on living and controlled polymerizations dedicated to Axel Müller

Fabrication of chemically bonded polyacrylate/silica hybrid films with high silicon contents by the sol–gel method

Preparation and properties of DNA–lipid complexes carrying pyrene and anthracene moieties

Synthesis and Secondary Structure of Poly(1-methylpropargyl- N -alkylcarbamate)s

Tyrosine-based poly(m-phenyleneethynylene-p-phenyleneethynylene)s. Helix folding and responsiveness to a base

Synthesis and gas permeation properties of various Si-containing poly(diarylacetylene)s and their desilylated membranes

Filter options

Publication date

Content availability

Publication type

Publication language

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Toshio Masuda

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Publication language

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options