2023

Ring-Chain Equilibria of Dynamic Macrocycles with a Bis(hindered amino)disulfide Linker
Rikito Takashima, Daisuke Aoki,* Shigeki Kuwata, and Hideyuki Otsuka*
Polym. Chem. 2023, 14(37), 4344-4351. 10.1039/D3PY00808H

Recent Developments in Reactions and Catalysis of Protic Pyrazole Complexes
Wei-Syuan Lin and Shigeki Kuwata*
Molecules 2023, 28(8), 3529(1-37). 10.3390/molecules28083529

Alkoxide-Decorated Copper Nanoparticles on Amidine-Modified Polymers as Hydrogenation Catalysts for Enabling H₂ Heterolysis
Ryo Watari,* Takanori Itoh, Shigeki Kuwata, and Yoshihito Kayaki*
ACS Catal. 2023, 13(8), 5159-5169. 10.1021/acscatal.3c00246

2022

Regioselective Transfer Hydrogenative Defluorination of Polyfluoroarenes Catalyzed by Bifunctional Azairidacycle
Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
Organics 2022, 3(3), 150-160. 10.3390/org3030012

Asymmetric Transfer Hydrogenative Amination of Benzylic Ketones Catalyzed by Cp*Ir(III) Complexes Bearing a Chiral N-(2-Picolyl)sulfonamidato Ligand
Takuma Kawada, Kenya Yabushita, Toshihisa Yasuda, Takeshi Ohta, Takaaki Yajima, Kouichi Tanaka, Noriyuki Utsumi, Masahito Watanabe, Kunihiko Murata, Yoshihito Kayaki, Shigeki Kuwata,* and Takeaki Katayama
J. Org. Chem. 2022, 87(13), 8458-8468. 10.1021/acs.joc.2c00580

Redox Non-innocence of ortho-Benzoquinone Dioximate Dianion in Ligand Exchange on Ruthenium
Takuya Harada, Shinji Ando, and Shigeki Kuwata*
Eur. J. Inorg. Chem. 2022, (25), e202200293(1-6). 10.1002/ejic.202200293

Dinaphtho[2,1-b:1',2'-d]thiophene as High Refractive Index Materials Exploiting the Potential Characteristics of “Dynamic Thiahelicenes”
Yoko Nambu,* Yoko Yoshitake, Shohan Yanagi, Kenji Mineyama, Keisuke Tsurui, Shigeki Kuwata, Toshikazu Takata, Tadatomi Nishikubo, and Ken Ishikawa
J. Mater. Chem. C 2022, 10(2), 726-733. 10.1039/D1TC03685H

Large-Stokes-shifted Yellow Photoluminescence Emission from an Imide and Polyimides Forming Multiple Intramolecular Hydrogen Bonds
Naiqiang Liang, Shigeki Kuwata, Ryohei Ishige, and Shinji Ando*
Mater. Chem. Front. 2022, 6(1), 24-32. 10.1039/D1QM01280K

2021

Synthesis and Characterization of White-Light Luminescent End-Capped Polyimides Based on FRET and Excited State Intramolecular Proton Transfer
Atsuko Tabuchi, Teruaki Hayakawa, Shigeki Kuwata, Ryohei Ishige, and Shinji Ando*
Polymers 2021, 13(22), 4050(1-17). 10.10.3390/polym13224050

Ruthenium Macrocycles Bearing Pyridine Bis(carboxamide): Synthesis, Structure, and Catalytic Activity for Hydrosilylation
Hiroki Sato, Tadashi Tsukamoto, Hiromitsu Sogawa, Shigeki Kuwata, and Toshikazu Takata*
New J. Chem. 2021, 45(39), 18282-18289. 10.1039/D0NJ06133F

New Approach to Recycling of Epoxy Resin Using Nitric Acid: Regeneration of Decomposed Products through Hydrogenation
Takuma Hanaoka,* Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, and Masatoshi Kubouchi
ACS Sustainable Chem. Eng. 2021, 9(37), 12520-12529. 10.1021/acssuschemeng.1c01737

Full-Colour Solvatochromic Fluorescence Emitted from a Semi-Aromatic Imide Compound Based on ESIPT and Anion Formation
Atsuko Tabuchi, Teruaki Hayakawa, Shigeki Kuwata, Ryohei Ishige, and Shinji Ando*
Mater. Adv. 2021, 2(17), 5629-5638. 10.1039/D1MA00308A

Oxy-Tethered Cp*Ir(III) Complex as a Competent Catalyst for Selective Dehydrogenation from Formic Acid
Hitomi Nakamura, Minori Yoshida, Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
Chem. Commun. 2021, 57(45), 5534-5537. 10.1039/D1CC01712H

Synthesis, Structures, and Reactivities of Iron Complexes Bearing an Isoindoline-Based, Polyprotic Pincer-Type Pyrazole Ligand
Tatsuro Toda and Shigeki Kuwata*
Z. Anorg. Allg. Chem. 2021, 647(14), 1471-1477. 10.1002/zaac.202100103

A Diazene-Bridged Diruthenium Complex with Structural Restraint Defined by Single meta-Diphosphinobenzene
Satoshi Suzuki, Tatsuro Toda, and Shigeki Kuwata*
Dalton Trans. 2021, 50(14), 4789-4795. 10.1039/D0DT04398B [highlighted as back cover]

Analysis of Nitric Acid Decomposition of Epoxy Resin Network Structures for Chemical Recycling
Takuma Hanaoka,* Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, and Masatoshi Kubouchi
Polym. Degrad. Stab. 2021, 186, 109537(1-8). 10.1016/j.polymdegradstab.2021.109537

Synthesis, Structures, and Reactivities of Six-Membered C-N Chelate Protic Pyrazole Complexes of Iridium
Yohei Kashiwame, Takao Ikariya, and Shigeki Kuwata*
Polyhedron 2021, 197, 115036(1-7). 10.1016/j.poly.2021.115036
A free access until March 14, 2021.

The Activation of Furfuryl Alcohol Polymerization by Oxygen and Its Enhanced Mechanical Properties
Kazushi Shibutani,* Jun Nakai, Ketkanok Aphichartsuphapkhajorn, Yoshihito Kayaki, Shigeki Kuwata, Yoshihiko Arao, Masatoshi Kubouchi
J. Appl. Polym. Sci., 2021, 138(17), e50311(1-10). 10.1002/app.50311

2020

Coordination Chemistry of Protic Pincer-Type Bis(pyrazolyl)pyridines and Related Compounds
Shigeki Kuwata*
Bull. Jpn. Soc. Coord. Chem. 2020, 76, 21-30. [in Japanese] 10.4019/bjscc.76.21

Central N-Heterocyclic Carbene Moieties in Protic Pincer-Type Bis(pyrazole) Ligands: Perturbation on Steric and Electronic Properties of Ruthenium Center
Tatsuro Toda and Shigeki Kuwata*
J. Organomet. Chem. 2020, 917, 121270(1-7). 10.1016/j.jorganchem.2020.121270
A free access until June 5, 2020.

Open Clamshell Dinuclear Palladium(II) Complexes Possessing Out-of-Plane Anisotropy
Koji Yamamoto, Kazuki Higuchi, Shigeki Kuwata, Yoshihiro Hayashi, Susumu Kawauchi, and Toshikazu Takata*
Dalton Trans. 2020, 49(9), 2781-2785. 10.1039/D0DT00323A

A Universal Strategy toward Cyclic Topologies Based on the Dynamic Behavior of a Bis(hindered amino)disulfide Linker
Nao Tsurumi, Rikito Takashima, Daisuke Aoki,* Shigeki Kuwata, and Hideyuki Otsuka*
Angew. Chem. Int. Ed. 2020, 59(11), 4269-4273. 10.1002/anie.201910722
Angew. Chem. 2020, 132(11), 4299-4303. 10.1002/ange.201910722

Amidines as Effective Ancillary Ligands in Copper-Catalyzed Hydrogenation of Carbon Dioxide
Ryo Watari,* Shigeki Kuwata, and Yoshihito Kayaki*
Chem. Lett. 2020, 49(3), 252-254. 10.1246/cl.190873

Macrocyclic Metal Complexes Bearing Rigid Polyaromatic Ligands: Synthesis and Catalytic Activity
Koji Yamamoto, Kazuki Higuchi, Masahiro Ogawa, Hiromitsu Sogawa, Shigeki Kuwata, Yoshihiro Hayashi, Susumu Kawauchi, and Toshikazu Takata*
Chem. Asian J. 2020, 15(3), 356-359. 10.1002/asia.201901561

Mechanistic Study on Catalytic Disproportionation of Hydrazine by a Protic Pincer-Type Iron Complex through Proton-Coupled Electron Transfer
Hiromasa Tanaka,* Seiji Hitaoka, Kazuki Umehara, Kazunari Yoshizawa, and Shigeki Kuwata*
Eur. J. Inorg. Chem. 2020, (15-16), 1472-1482. 10.1002/ejic.201901135

Half-Sandwich Iridium Complexes Bearing a Diprotic Glyoxime Ligand: Structural Diversity Induced by Reversible Deprotonation
Taishin Takamura, Takuya Harada, Tatsuro Furuta, Takao Ikariya, and Shigeki Kuwata*
Chem. Asian J. 2020, 15(1), 72-78. 10.1002/asia.201901276 [highlighted as front cover]

2019

Synthesis of a Half-Sandwich Hydroxidoiridium(III) Complex Bearing a Nonprotic N-Sulfonyldiamine Ligand and Its Transformations Triggered by the Brøsted Basicity
Shoko Kamezaki, Yoshihito Kayaki,* Shigeki Kuwata, and Takao Ikariya
Inorganics 2019, 7(10), 125(1-8). 10.3390/inorganics7100125

Synthesis and Characterization of 9,9-Bis(4-hydroxyphenyl and 4-aminophenyl)dibenzofluorenes: Novel Fluorene-Based Monomers
Surasak Seesukphronrarak, Shinichi Kawasaki, Shigeki Kuwata, and Toshikazu Takata*
J. Polym. Sci., Part A: Polym. Chem. 2019, 57(24), 2602-2605. 10.1002/pola.29540

Reductive Amination of Ketonic Compounds Catalyzed by Cp*Ir(III) Complexes Bearing Picolinamidato Ligands
Kouichi Tanaka, Takashi Miki, Kunihiko Murata, Ayumi Yamaguchi, Yoshihito Kayaki, Shigeki Kuwata,* Takao Ikariya, and Masahito Watanabe*
J. Org. Chem. 2019, 84(17), 10962-10977. 10.1021/acs.joc.9b01565

Metal-Ligand Cooperative C-O Bond Cleavage of Propargylic Alcohol with Protic Pyrazole Complexes of Ruthenium
Naoto Tashima, Satomi Ohta, and Shigeki Kuwata*
Faraday Discuss. 2019, 220, 364-375. 10.1039/C9FD00040B

A P-C Chelate, Protic 1,2-Dihydropyridin-2-ylidene Ruthenium Complex: Synthesis, Structure, and Reversible Deprotonation
Naoto Tashima, Taka Sawazaki, Yoshihito Kayaki, Shigeki Kuwata*
Chem. Lett. 2019, 48(8), 787-790. 10.1246/cl.190253

Poly(ethyleneimine)s-Mediated Consecutive Hydrogenation of Carbon Dioxide to Methanol with Ru Catalysts
Atsuki Yoshimura, Ryo Watari, Shigeki Kuwata, and Yoshihito Kayaki*
Eur. J. Inorg. Chem. 2019, (18), 2375-2380. 10.1002/ejic.201900322

Cleavage of N-H Bond of Ammonia via Metal-Ligand Cooperation Enables Rational Design of a Conceptually New Noyori-Ikariya Catalyst
Pavel A. Dub,* Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
J. Am. Chem. Soc. 2019, 141(6), 2661-2677. 10.1021/jacs.8b12961

Metallo-Supramolecular Assembly of Protic Pincer-Type Complexes: Encapsulation of Dinitrogen and Carbon Disulfide into Multiproton-Responsive Diruthenium Cage
Tatsuro Toda, Satoshi Suzuki, and Shigeki Kuwata*
Chem. Commun. 2019, 55(8), 1028-1031. 10.1039/C8CC08384C [highlighted as inside back cover]

2018

Design of Multiproton-Responsive Metal Complexes as Molecular Technology for Transformation of Small Molecules
Shigeki Kuwata
In Molecular Technology: Energy Innovation, Yamamoto, H.; Kato, T., Eds.; Wiley-VCH, 2018; pp81-103. (ISBN: 978-3-527-80278-4) 10.1002/9783527823987.vol1_c4

Accessible Bifunctional Oxy-tethered Ruthenium(II) Catalysts for Asymmetric Transfer Hydrogenation
Asuka Matsunami, Marika Ikeda, Hitomi Nakamura, Minori Yoshida, Shigeki Kuwata, and Yoshihito Kayaki*
Org. Lett. 2018, 20(17), 5213-5218. 10.1021/acs.orglett.8b02157

Complexes Bearing Protic N-Heterocyclic Carbene Ligands
Shigeki Kuwata* and F. Ekkehardt Hahn*
Chem. Rev. 2018, 118(19), 9642-9677. 10.1021/acs.chemrev.8b00176

Nucleophilic Aromatic Substitution in Hydrodefluorination Exemplified by Hydridoiridium(III) Complexes with Fluorinated Phenylsulfonyl-1,2-diphenylethylenediamine Ligands
Asuka Matsunami, Yoshihito Kayaki,* Shigeki Kuwata, and Takao Ikariya
Organometallics 2018, 37(12), 1958-1969. 10.1021/acs.organomet.8b00242

Science of Nitrogen Fixation Developed by Cooperation between Chemistry and Biology
Shigeki Kuwata* and Masanobu Hidai*
J. Synth. Org. Chem. Jpn. 2018, 76(4), 346-357. [in Japanese] 10.5059/yukigoseikyokaishi.76.346

Hydrogen Evolution from Formic Acid and Hydrodefluorination of Fluoroarenes by Bifunctional Iridium Catalysts --- Beyond the Transfer Hydrogenation
Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
J. Synth. Org. Chem. Jpn. 2018, 76(4), 315-324. [in Japanese] 10.5059/yukigoseikyokaishi.76.315

Protic NNN and NCN Pincer-Type Ruthenium Complexes Featuring (Trifluoromethyl)pyrazole Arms: Synthesis and Application to Catalytic Hydrogen Evolution from Formic Acid
Yoshiko Nakahara, Tatsuro Toda, Asuka Matsunami, Yoshihito Kayaki, and Shigeki Kuwata*
Chem. Asian J. 2018, 13(1), 73-80. 10.1002/asia.201701474

Iron and Ruthenium Complexes Having a Pincer-type Ligand with Two Protic Amidepyrazole Arms: Structures and Catalytic Application
Yoshiko Nakahara, Tatsuro Toda, and Shigeki Kuwata*
Polyhedron 2018, 143, 105-110. 10.1016/j.poly.2017.08.044
A free access until April 20, 2018.

2017

Ruthenium-Catalyzed Dimerization of 1,1-Diphenylpropargyl Alcohol to a Hydroxybenzocyclobutene and Related Reactions
Hoang Ngan Nguyen, Naoto Tashima, Takao Ikariya, and Shigeki Kuwata*
Inorganics 2017, 5(4), 80(1-8). 10.3390/inorganics5040080

Distinct Promotive Effects of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) on Polymer Supports in Copper-Catalyzed Hydrogenation of C=O Bonds
Ryo Watari,* Norio Matsumoto, Shigeki Kuwata, and Yoshihito Kayaki*
ChemCatChem 2017, 9(24), 4501-4507. 10.1002/cctc.201701316

A Bifunctional Iridium Catalyst Modified for Persistent Hydrogen Generation from Formic Acid: Understanding Deactivation via Cyclometalation of a 1,2-Diphenylethylenediamine Motif
Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
ACS Catal. 2017, 7(7), 4479-4484. 10.1021/acscatal.7b01068

Synthesis and Structures of NCN Pincer-Type Ruthenium and Iridium Complexes Bearing Protic Pyrazole Arms
Tatsuro Toda, Koki Saitoh, Akihiro Yoshinari, Takao Ikariya, and Shigeki Kuwata*
Organometallics 2017, 36(6), 1188-1195. 10.1021/acs.organomet.7b00065

Kinetically Stabilized Aliphatic Nitrile N-Oxides as Click Agents: Synthesis, Structure, and Reactivity
Toyokazu Tsutsuba, Hiromitsu Sogawa, Shigeki Kuwata, and Toshikazu Takata*
Chem. Lett. 2017, 46(3), 315-318. 10.1246/cl.161098

Stereoselective Synthesis of Chloride-Phosphine Ruthenium Complexes Bearing a Pyrazole-Based Protic Tripodal Amine Ligand
Hiroaki Yamagishi, Hiroyuki Konuma, and Shigeki Kuwata*
Polyhedron 2017, 125, 173-178. 10.1016/j.poly.2016.11.037

2016

Protic N-heterocyclic Carbene versus Pyrazole: Rigorous Comparison of Proton- and Electron-Donating Abilities in a Pincer-Type Framework
Tatsuro Toda, Akihiro Yoshinari, Takao Ikariya,* and Shigeki Kuwata*
Chem. Eur. J. 2016, 22(46), 16675-16683. 10.1002/chem.201602552

Hydrodefluorination of Fluoroarenes Using Hydrogen Transfer Catalysts with a Bifunctional Iridium/NH Moiety
Asuka Matsunami, Shigeki Kuwata, and Yoshihito Kayaki*
ACS Catal. 2016, 6(8), 5181-5185. 10.1021/acscatal.6b01590

Structural Analysis and Inclusion Mechanism of Native and Permethylated α-Cyclodextrin-Based Rotaxanes Containing Alkylene Axles
Yosuke Akae, Yasuhito Koyama, Hiromitsu Sogawa, Yoshihiro Hayashi, Susumu Kawauchi, Shigeki Kuwata, and Toshikazu Takata*
Chem. Eur. J. 2016, 22(15), 5335-5341. 10.1002/chem.201504882

2015

Protic Ruthenium Tris(pyrazol-3-ylmethyl)amine Complexes Featuring a Hydrogen-Bonding Network in the Second Coordination Sphere
Hiroaki Yamagishi, Shohei Nabeya, Takao Ikariya,* and Shigeki Kuwata*
Inorg. Chem. 2015, 54(24), 11584-11586. 10.1021/acs.inorgchem.5b02044

Synthesis and Structures of Ruthenium and Iron Complexes Bearing an Unsymmetrical Pincer-Type Ligand with Protic Pyrazole and Tertiary Aminoalkyl Arms
Tatsuro Toda, Shigeki Kuwata,* and Takao Ikariya*
Z. Anorg. Allg. Chem. 2015, 641(12-13), 2135-2139. 10.1002/zaac.201500558

Exact Helical Polymer Synthesis by Two-Point-Covalent-Linking Protocol between C₂-Chiral Spirobifluorene and C₂- or C_s-Symmetric Anthraquinone Monomers
Zhaozhong Yi, Hitoshi Okuda, Yasuhito Koyama, Ryota Seto, Satoshi Uchida, Hiromitsu Sogawa, Shigeki Kuwata, and Toshikazu Takata*
Chem. Commun. 2015, 51(52), 10423-10426. 10.1039/C5CC02086G

Synthesis and Cavity Size Effect of Pd-containing Macrocycle Catalyst for Efficient Intramolecular Hydroamination of Allylurethane
Masahiro Ogawa, Masaki Nagashima, Hiromitsu Sogawa, Shigeki Kuwata, and Toshikazu Takata*
Org. Lett. 2015, 17(7), 1664-1667. 10.1002/10.1021/acs.orglett.5b00378

2014

Cyclodextrin-Based Size-Complementary [3]Rotaxanes: Selective Synthesis and Specific Dissociation
Akae Yosuke, Yasuhiro Koyama , Shigeki Kuwata, and Toshikazu Takata*
Chem. Eur. J. 2014, 20(51), 17132-17136. 10.1002/chem.201405005

Metal-Ligand Bifunctional Reactivity and Catalysis of Protic N-Heterocyclic Carbene and Pyrazole Complexes Featuring β-NH Units
Shigeki Kuwata* and Takao Ikariya*
Chem. Commun. 2014, 50(92), 14290-14300. 10.1039/c4cc04457f

Unsymmetrical Pincer-Type Ruthenium Complex Containing β-Protic Pyrazole and N-Heterocyclic Carbene Arms: Comparison of Brøsted Acidity of NH Groups in Second Coordination Sphere
Tatsuro Toda, Shigeki Kuwata,* and Takao Ikariya*
Chem. Eur. J. 2014, 20(31), 9539-9542. 10.1002/chem.201403179

Synthesis, Structures, and Reactivities of Iron, Cobalt, and Manganese Complexes Bearing a Pincer Ligand with Two Protic Pyrazole Arms
Kazuki Umehara, Shigeki Kuwata,* and Takao Ikariya*
Inorg. Chim. Acta 2014, 413, 136-142. 10.1016/j.ica.2013.12.041