Search results for: Kazunari Yoshizawa

Items from 1 to 20 out of 199 results

article

Cover Feature: Intramolecular Hiyama Coupling: Synthesis of 1,8,13‐Trisubstituted Chiral Triptycenes with Three Different Substituents by Intramolecular Substituent Transfer (Chem. Eur. J. 39/2023)

Takayuki Iwata, Masato Hanada, Satoru Kumagai, Tatsuro Yoshinaga, more

Chemistry – A European Journal > 29 > 39 > n/a - n/a

The proximity of Si−O−Pd plays an important role not only in the formation of the oxy‐palladium species in intramolecular Hiyama coupling, but also in the activation of the silyl group to facilitate intramolecular substituent transfer. Various 1,8,13‐trisubstituted chiral triptycenes were synthesized by using this reaction. More information can be found in the Research Article by T. Iwata, M. Shindo,...

article

Intramolecular Hiyama Coupling: Synthesis of 1,8,13‐Trisubstituted Chiral Triptycenes with Three Different Substituents by Intramolecular Substituent Transfer

Takayuki Iwata, Masato Hanada, Satoru Kumagai, Tatsuro Yoshinaga, more

Chemistry – A European Journal > 29 > 39 > n/a - n/a

Herein, we describe Hiyama coupling via intramolecular substituent transfer from silicon on one blade of triptycenes to another to yield 1,8,13‐trisubstituted chiral triptycenes. This reaction is attributed to the proximity effect of substituents on triptycene, which plays an important role in not only the formation of the oxy‐palladacycle but also the activation of the silyl group to facilitate σ‐bond...

article

Extraordinary Acceleration of an Electrophilic Reaction Driven by the Polar Surface of 2D Aluminosilicate Nanosheets

Nagy L. Torad, Yuta Tsuji, Azhar Alowasheeir, Masako Momotake, more

Small > 19 > 11 > n/a - n/a

To increase chemical reaction rates, general solutions include increasing the concentration/temperature and introducing catalysts. In this study, the rate constant of an electrophilic metal coordination reaction is accelerated 23‐fold on the surface of layered aluminosilicate (LAS), where the reaction substrate (ligand molecule) induces dielectric polarization owing to the polar and anionic surface...

article

Spontaneous Assembly and Three‐Dimensional Stacking of Antiaromatic 5,15‐Dioxaporphyrin on HOPG

Tsang‐Wei Matt Chen, Yuki Tanaka, Yohei Kametani, Kum‐Yi Cheng, more

Angewandte Chemie International Edition > 61 > 48 > n/a - n/a

Antiaromatic compounds have recently received considerable attention because of their novel properties such as narrow HOMO–LUMO gaps and facile formation of mutual stacking. Here, the spontaneous assembly of antiaromatic meso‐2‐thienyl‐substituted 5,15‐dioxaporphyrin (DOP‐1) is scrutinized at the liquid‐solid interface by scanning tunneling microscopy (STM). Polymorphism in monolayers characterized...

article

Spontaneous Assembly and Three‐Dimensional Stacking of Antiaromatic 5,15‐Dioxaporphyrin on HOPG

Tsang‐Wei Matt Chen, Yuki Tanaka, Yohei Kametani, Kum‐Yi Cheng, more

Angewandte Chemie > 134 > 48 > n/a - n/a

article

Catalytic Reduction of Dinitrogen into Ammonia and Hydrazine by Using Chromium Complexes Bearing PCP‐Type Pincer Ligands**

Yuya Ashida, Akihito Egi, Kazuya Arashiba, Hiromasa Tanaka, more

Chemistry – A European Journal > 28 > 25 > n/a - n/a

A series of chromium‐halide, ‐nitride, and ‐dinitrogen complexes bearing carbene‐ and phosphine‐based PCP‐type pincer ligands has been newly prepared, and some of them are found to work as effective catalysts to reduce dinitrogen under atmospheric pressure, whereby up to 11.60 equiv. of ammonia and 2.52 equiv. of hydrazine (16.6 equiv. of fixed N atom) are produced based on the chromium atom. To the...

article

Cover Feature: Catalytic Reduction of Dinitrogen into Ammonia and Hydrazine by Using Chromium Complexes Bearing PCP‐Type Pincer Ligands (Chem. Eur. J. 25/2022)

Yuya Ashida, Akihito Egi, Kazuya Arashiba, Hiromasa Tanaka, more

Chemistry – A European Journal > 28 > 25 > n/a - n/a

A series of chromium complexes bearing a carbene‐ and phosphine‐based PCP‐type pincer ligand has been newly prepared, and some of them are found to work as effective catalysts to reduce dinitrogen into ammonia and hydrazine under atmospheric pressure. This reaction can be expressed as nitrogen molecules (raindrops) being converted into ammonia and hydrazine on the chromium complex (umbrella). More...

article

Heterointerface Created on Au‐Cluster‐Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction (Adv. Mater. 16/2022)

Sho Kitano, Tomohiro G. Noguchi, Masamichi Nishihara, Kazutaka Kamitani, more

Advanced Materials > 34 > 16 > n/a - n/a

Oxygen Evolution Reaction In article number 2110552, Aleksandar Staykov, Miho Yamauchi, and co‐workers report that Au‐cluster‐loaded unillamellar hydroxide catalysts drastically enhance the electrochemical oxygen evolution reaction (OER). The electronic sates of a catalytic site can be finely tuned by the formation of a Au‐cluster–hydroxide interface for the OER. Theoretical and advanced spectroscopic...

article

Heterointerface Created on Au‐Cluster‐Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction

Sho Kitano, Tomohiro G. Noguchi, Masamichi Nishihara, Kazutaka Kamitani, more

Advanced Materials > 34 > 16 > n/a - n/a

The oxygen evolution reaction (OER) is a critical element for all sorts of reactions that use water as a hydrogen source, such as hydrogen evolution and electrochemical CO₂ reduction, and novel design principles that provide highly active sites on OER electrocatalysts push the limits of their practical applications. Herein, Au‐cluster loading on unilamellar exfoliated layered double hydroxide (ULDH)...

article

Quadruple Role of Pd Catalyst in Domino Reaction Involving Aryl to Alkyl 1,5‐Pd Migration to Access 1,9‐Bridged Triptycenes

Takayuki Iwata, Satoru Kumagai, Tatsuro Yoshinaga, Masato Hanada, more

Chemistry – A European Journal > 27 > 45 > 11548 - 11553

A Pd‐catalyzed domino reaction of 1,8,13‐tribromo‐9‐methoxytriptycenes is reported. Under conventional Suzuki coupling conditions, the triptycenes underwent multiple transformations to give 1,9‐bridged triptycenes. Based on mechanistic investigations, a single Pd catalyst functions as Pd⁰, Pd^II and Pd^IV species to catalyze four distinct processes: (1) aryl to alkyl 1,5‐Pd migration, (2) intramolecular...

article

Cover Feature: Quadruple Role of Pd Catalyst in Domino Reaction Involving Aryl to Alkyl 1,5‐Pd Migration to Access 1,9‐Bridged Triptycenes (Chem. Eur. J. 45/2021)

Takayuki Iwata, Satoru Kumagai, Tatsuro Yoshinaga, Masato Hanada, more

Chemistry – A European Journal > 27 > 45 > 11478 - 11478

A Pd‐catalyzed domino reaction of 1,8,13‐tribromo‐9‐methoxytriptycenes is reported. Under conventional Suzuki coupling conditions, the triptycenes underwent multiple transformations to give 1,9‐bridged triptycenes. Based on mechanistic investigations, a single Pd catalyst functions as Pd⁰, Pd^II and Pd^IV species to catalyze four distinct processes: 1) aryl‐to‐alkyl 1,5‐Pd migration, 2) intramolecular...

article

Ammonia Formation Catalyzed by a Dinitrogen‐Bridged Dirhenium Complex Bearing PNP‐Pincer Ligands under Mild Reaction Conditions**

Fanqiang Meng, Shogo Kuriyama, Hiromasa Tanaka, Akihito Egi, more

Angewandte Chemie > 133 > 25 > 14025 - 14031

A series of rhenium complexes bearing a pyridine‐based PNP‐type pincer ligand are synthesized from rhenium phosphine complexes as precursors. A dinitrogen‐bridged dirhenium complex bearing the PNP‐type pincer ligands catalytically converts dinitrogen into ammonia during the reaction with KC₈ as a reductant and [HPCy₃]BAr^F₄ (Cy=cyclohexyl, Ar^F=3,5‐(CF₃)₂C₆H₃) as a proton source at −78 °C to afford...

article

Ammonia Formation Catalyzed by a Dinitrogen‐Bridged Dirhenium Complex Bearing PNP‐Pincer Ligands under Mild Reaction Conditions**

Fanqiang Meng, Shogo Kuriyama, Hiromasa Tanaka, Akihito Egi, more

Angewandte Chemie International Edition > 60 > 25 > 13906 - 13912

article

Synthesis, spectral characterization, density functional theory studies, and biological screening of some transition metal complexes of a novel hydrazide–hydrazone ligand of isonicotinic acid

Dina A. Tolan, Tahani I. Kashar, Kazunari Yoshizawa, Ahmed M. El‐Nahas

Applied Organometallic Chemistry > 35 > 6 > n/a - n/a

Novel Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) complexes (1–7) of hydrazide–hydrazone ligand (H₂L) derived from the condensation of isonicotinic acid hydrazide with (Z)‐N′‐(2‐nitrobenzylidene)‐3‐oxobutanehydrazide have been prepared. The ligand and its chelates were characterized based on elemental analysis, spectral, thermal analysis, molar conductance, and magnetic moment measurements...

article

Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen

Kazuya Arashiba, Hiromasa Tanaka, Kazunari Yoshizawa, Yoshiaki Nishibayashi

Chemistry – A European Journal > 26 > 59 > 13321 - 13321

Invited for the featured front cover of Kazuya Arashiba, Hiromasa Tanaka, Kazunari Yoshizawa, and Yoshiaki Nishibayashi at The University of Tokyo, Daido University, and Kyushu University. The image depicts a roulette wheel to represent the cycling reaction used in this work. Read the full text of the article at 10.1002/chem.202002200.

article

Front Cover: Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen (Chem. Eur. J. 59/2020)

Kazuya Arashiba, Hiromasa Tanaka, Kazunari Yoshizawa, Yoshiaki Nishibayashi

Chemistry – A European Journal > 26 > 59 > 13317 - 13317

Cycling between molybdenum(I)–dinitrogen and molybdenum(IV)–nitride complexes was investigated under ambient reaction conditions. Here, a new modified reaction pathway has been proposed based on the findings of experimental and theoretical results. The molecular dinitrogen (ball) on the roulette fixes as dinitrogen and nitride ligand on molybdenum complexes. The ball thrown into the roulette smoothly...

article

Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen

Kazuya Arashiba, Hiromasa Tanaka, Kazunari Yoshizawa, Yoshiaki Nishibayashi

Chemistry – A European Journal > 26 > 59 > 13383 - 13389

Cycling between molybdenum(I)‐dinitrogen and molybdenum(IV)‐nitride complexes was investigated under ambient reaction conditions. A kinetic study of the second‐order reaction rate for the conversion of the molybdenum‐dinitrogen complex into the molybdenum‐nitride complex indicates that the formation of the dinitrogen‐bridged dimolybdenum complex is involved in the rate‐determining step. DFT calculations...

article

Three‐Step Spin State Transition and Hysteretic Proton Transfer in the Crystal of an Iron(II) Hydrazone Complex

Takumi Nakanishi, Yuta Hori, Shuqi Wu, Hiroyasu Sato, more

Angewandte Chemie > 132 > 35 > 14891 - 14897

A proton–electron coupling system, exhibiting unique bistability or multistability of the protonated state, is an attractive target for developing new switchable materials based on proton dynamics. Herein, we present an iron(II) hydrazone crystalline compound, which displays the stepwise transition and bistability of proton transfer at the crystal level. These phenomena are realized through the coupling...

article

Three‐Step Spin State Transition and Hysteretic Proton Transfer in the Crystal of an Iron(II) Hydrazone Complex

Takumi Nakanishi, Yuta Hori, Shuqi Wu, Hiroyasu Sato, more

Angewandte Chemie International Edition > 59 > 35 > 14781 - 14787

article

Anthranoxides as Highly Reactive Arynophiles for the Synthesis of Triptycenes

Takayuki Iwata, Mizuki Hyodo, Takuto Fukami, Yoshihito Shiota, more

Chemistry – A European Journal > 26 > 39 > 8506 - 8510

We report herein an efficient method to synthesize triptycenes by the reaction of benzynes and anthranoxides, which are electron‐rich and readily prepared from the corresponding anthrones. Using this method, 1,9‐syn‐substituted triptycenes were regioselectively obtained employing 3‐methoxybenzynes. This method was also applied to synthesize pentiptycenes. A DFT study revealed that the cycloaddition...

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INFONA - science communication portal

Search results for: Kazunari Yoshizawa

Cover Feature: Intramolecular Hiyama Coupling: Synthesis of 1,8,13‐Trisubstituted Chiral Triptycenes with Three Different Substituents by Intramolecular Substituent Transfer (Chem. Eur. J. 39/2023)

Intramolecular Hiyama Coupling: Synthesis of 1,8,13‐Trisubstituted Chiral Triptycenes with Three Different Substituents by Intramolecular Substituent Transfer

Extraordinary Acceleration of an Electrophilic Reaction Driven by the Polar Surface of 2D Aluminosilicate Nanosheets

Spontaneous Assembly and Three‐Dimensional Stacking of Antiaromatic 5,15‐Dioxaporphyrin on HOPG

Spontaneous Assembly and Three‐Dimensional Stacking of Antiaromatic 5,15‐Dioxaporphyrin on HOPG

Catalytic Reduction of Dinitrogen into Ammonia and Hydrazine by Using Chromium Complexes Bearing PCP‐Type Pincer Ligands**

Cover Feature: Catalytic Reduction of Dinitrogen into Ammonia and Hydrazine by Using Chromium Complexes Bearing PCP‐Type Pincer Ligands (Chem. Eur. J. 25/2022)

Heterointerface Created on Au‐Cluster‐Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction (Adv. Mater. 16/2022)

Heterointerface Created on Au‐Cluster‐Loaded Unilamellar Hydroxide Electrocatalysts as a Highly Active Site for the Oxygen Evolution Reaction

Quadruple Role of Pd Catalyst in Domino Reaction Involving Aryl to Alkyl 1,5‐Pd Migration to Access 1,9‐Bridged Triptycenes

Cover Feature: Quadruple Role of Pd Catalyst in Domino Reaction Involving Aryl to Alkyl 1,5‐Pd Migration to Access 1,9‐Bridged Triptycenes (Chem. Eur. J. 45/2021)

Ammonia Formation Catalyzed by a Dinitrogen‐Bridged Dirhenium Complex Bearing PNP‐Pincer Ligands under Mild Reaction Conditions**

Ammonia Formation Catalyzed by a Dinitrogen‐Bridged Dirhenium Complex Bearing PNP‐Pincer Ligands under Mild Reaction Conditions**

Synthesis, spectral characterization, density functional theory studies, and biological screening of some transition metal complexes of a novel hydrazide–hydrazone ligand of isonicotinic acid

Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen

Front Cover: Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen (Chem. Eur. J. 59/2020)

Cycling between Molybdenum‐Dinitrogen and ‐Nitride Complexes to Support the Reaction Pathway for Catalytic Formation of Ammonia from Dinitrogen

Three‐Step Spin State Transition and Hysteretic Proton Transfer in the Crystal of an Iron(II) Hydrazone Complex

Three‐Step Spin State Transition and Hysteretic Proton Transfer in the Crystal of an Iron(II) Hydrazone Complex

Anthranoxides as Highly Reactive Arynophiles for the Synthesis of Triptycenes

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