Article
Polymer Science
Zhunxuan Li, Rui Chen, Ying Wang, Linlin Zhu, Wenyi Luo, Zhen Zhang, Nikos Hadjichristidis
Summary: An efficient synthetic methodology was developed for the modification of hyperbranched polyethyleneimines (PEI) using N-sulfonyl aziridines, resulting in materials with unique fluorescence properties and the ability to remove hazardous metals.
Article
Chemistry, Physical
Lantao Liu, Fangyuan Cheng, Chenxiang Meng, An-An Zhang, Mingliang Zhang, Kai Xu, Naoki Ishida, Masahiro Murakami
Summary: A Pd-catalyzed chemo-, regio-, and enantioselective ring-closing/ring-opening cross coupling reaction has been developed with diverse aryl halide-tethered alkenes and benzocyclobutenols as substrates. This method provides a convenient approach to chiral 2,3-dihydrobenzofurans with excellent enantioselectivities, and has been applied in the concise synthesis of analogues of cannabinoid receptor 2 agonists.
Article
Chemistry, Multidisciplinary
Shuai Huang, Yikang Shen, Hari K. Bisoyi, Yu Tao, Zhongcheng Liu, Meng Wang, Hong Yang, Quan Li
Summary: The development of covalent adaptable liquid crystal networks with self-healing properties and reversible shape programmability broadens the applications of liquid crystal actuators in soft robotic devices. The strategy of fabricating photo-responsive polydisulfide-based covalent adaptable LCNs enables self-healing, reshapable, and reprogrammable materials, with the potential for catalytic depolymerization to recycle monomers, offering a more economical and environmentally friendly strategy for the fabrication of functional soft robotics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Polymer Science
Daisuke Hotta, Arihiro Kanazawa, Sadahito Aoshima
Summary: tert-Butyl esters play a crucial role as chain transfer agents in the cationic copolymerization, liberating tert-butyl cations to facilitate the chain transfer process. The chain transfer reactions by tert-butyl esters potentially occur reversibly through the reaction of the propagating cation with the ester group at the omega-end of another chain.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Mohammad Yasir, Andreas F. M. Kilbinger
Summary: Norbornene and cyclohexene show different polymerization behaviors using Grubbs' catalysts due to their varying ring strain energy levels; a sequence-selective cascade polymerization of a monomer containing both rings resulted in polymers with moderate molecular weight dispersities and good control over molecular weight.
Article
Chemistry, Multidisciplinary
Arne Merschel, Yury V. Vishnevskiy, Beate Neumann, Hans-Georg Stammler, Rajendra S. Ghadwal
Summary: An unprecedented ring-opening of mesoionic carbenes (iMICs) based on an 1,3-imidazole scaffold to yield N-ethynylformimidamide (eFIM) derivatives as crystalline solids. The eFIMs are thermally stable under an inert atmosphere and show moderate air stability. They are excellent surrogates of iMICs and readily undergo ring-closing click reactions with a variety of main-group as well as transition metal Lewis acids to form challenging iMIC-compounds in good to excellent yields.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Polymer Science
Patrizia P. Smith, Stephen G. Boyes
Summary: Amphiphilic block copolymers were successfully synthesized using a dual initiator chain transfer agent. Comprehensive kinetics studies provided valuable insights into factors influencing the synthesis of well-defined block copolymers, as well as the ability to produce poly(lactide) blocks of different molecular weights. The role of the chain transfer agent in facilitating the complex and sterically demanding RAFT polymerization of PEGEEMA was also examined through kinetics monitoring.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Lasith S. Kariyawasam, Julian Rolsma, Ying Yang
Summary: In this study, a highly desirable polymer recycling technique called monomer-polymer recycling of polydithioacetal (PDTA) was reported. The PDTAs were synthesized from 3,4,5-trimethoxybenzaldehyde and alkyl dithiols and exhibited depolymerizability via ring-closing depolymerization and entropy-driven ring-opening polymerization (ED-ROP). The crosslinked network of PDTA showed thermal reprocessability and could be recycled into macrocyclic monomers in solvent for regenerating the crosslinked network. This study demonstrated the potential of PDTA as a new molecular platform for designing recyclable polymers and highlighted the advantages of ED-ROP for polymerization at higher temperatures.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Inorganic & Nuclear
Richard J. Puddephatt
Summary: This study provides an overview of the progress made in dynamic ring opening polymerization (D-ROP) over the past 20 years. D-ROP involves the self-assembly of metal ions and flexible ligands to form highly selective coordination polymers with various additional functionalities.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Phuong T. T. Do, Berwyck L. J. Poad, Hendrik Frisch
Summary: This study presents a strategy to program photodegradability into vinylic polymers by utilizing the wavelength selectivity of photocycloadditions for radical ring-opening polymerization (rROP). Coumarin terminated allylic sulfides were irradiated with UVA light to initiate intramolecular [2+2] photocycloaddition, generating cyclic macromonomers. Copolymers with photoreactivity inherited from the cyclic parent monomer were synthesized through subsequent RAFT-mediated rROP with methyl acrylate. Efficient photocycloreversion of the coumarin dimers upon UVB irradiation led to polymer degradation within minutes under UVB light or days under sunlight. This synthetic strategy enables the incorporation of photolabile linkages into vinylic polymers, tuning degradation for specific wavelengths.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Narumi Miyasako, Shin-ichi Matsuoka, Masato Suzuki
Summary: New ester-functionalized bicyclic aliphatic polymers were successfully synthesized through ring-opening metathesis polymerization (ROMP) of various norbornene lactones and their analogues, followed by hydrogenation. The comparison and discussion of polymerizability and thermal properties between different monomers before and after hydrogenation were conducted. The obtained polymers showed excellent thermal stability and processing deformation suitable for transparent resin materials.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Hien The Ho, Nam Hoai Nguyen, Marion Rollet, Trang N. T. Phan, Didier Gigmes
Summary: In this study, well-defined phosphonate-functionalized polycarbonate with low dispersity (D = 1.22) was synthesized using organocatalyzed ring-opening polymerization (ROP) of novel phosphonate-based cyclic monomers. Copolymerization was also performed to access different structures of phosphonate-containing polycarbonates (PC). Furthermore, phosphonate-functionalized PC was successfully synthesized using a combination of ROP and post-modification reaction.
Article
Multidisciplinary Sciences
Yali Hu, Zi-You Tian, Wei Xiong, Dedao Wang, Ruichi Zhao, Yan Xie, Yu-Qin Song, Jun Zhu, Hua Lu
Summary: This study presents a water-assisted controlled ring-opening polymerization method for ProNCA, which enables the rapid synthesis of well-defined PLP in a short time. The use of water facilitates proton shift and lowers the energy barrier, leading to fast and efficient reactions. The protein-mediated ROP of ProNCA offers a convenient approach for the synthesis of various protein-PLP conjugates with enhanced properties.
NATIONAL SCIENCE REVIEW
(2022)
Article
Energy & Fuels
Yongzhao Zhang, Yifan Li, Zequan Zeng, Jiangliang Hu, Zhanggen Huang
Summary: This study investigates the promotion effect of CuMn2O4 catalyst modification with NaOH on toluene oxidation. The results show that NaOH species significantly enhance the catalytic performance without improving the lattice oxygen activity. The introduction of NaOH inhibits carbonate formation and accelerates the degradation of the benzoate aromatic ring, leading to improved catalytic activity.
Article
Chemistry, Organic
Lorand Kiss, Lamiaa Ouchakour, Melinda Nonn, Attila M. Remete
Summary: This study presents a synthesis method for derivatives through ring C=C bond oxidative cleavage and double reductive amination, comparing two common approaches. It also highlights the increasing relevance of organofluorine chemistry in drug research and the high biological potential of beta-amino acid derivatives.
Article
Chemistry, Organic
Yuta Takemasa, Kyoko Nozaki
Summary: In this study, a molecule with both BQ and HQ moieties in a triptycene framework was reported, and two types of crystals with different hydrogen-bonding structures were obtained by changing the cosolvents.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Takuya Higashi, Shuhei Kusumoto, Kyoko Nozaki
Summary: In this study, the reaction of cyclopentadienone iridium complex with hydrosilanes was reported, resulting in the formation of hydroxycyclopentadienyl iridium silyl complexes. The subsequent reductive elimination of the C-H bond at the silicon center released benzene and formed a silylene complex. The silylene complex showed ambiphilic reactivities.
Review
Chemistry, Multidisciplinary
Shan Tang, Kyoko Nozaki
Summary: Carbon dioxide (CO2) has long been considered a sustainable comonomer for polymer synthesis. Incorporating CO2 into polyolefin materials has been challenging, but a breakthrough has been made by using a metastable lactone intermediate, 3-ethylidene-6-vinyltetrahydro-2H-pyran-2-one (EVP), which can be produced from CO2 and butadiene. This strategy allows for the synthesis of highly versatile copolymers from an olefin, CO2, and butadiene.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Organic
Takuya Higashi, Shuhei Kusumoto, Kyoko Nozaki
Summary: Metal-ligand cooperation is a highly researched area in recent years, where both metal and ligand actively participate in bond cleavage and formation. Cyclopentadienone-hydroxycyclopentadienyl-based metal complexes exhibit unique redox activity of the metal center along with heterolytic bond cleavage. This article summarizes recent progress in the metal-ligand cooperative cleavage reactions of C-H and B-H bonds by cyclopentadienone metal complexes, with an introduction to the historical background.
JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN
(2022)
Article
Polymer Science
Minoru Koyama, Midori Akiyama, Kimiaki Kashiwagi, Kyoko Nozaki, Takashi Okazoe
Summary: In this study, a CF3-rich perfluoropolyether (PFPE) with a crystalline structure was successfully synthesized. This solid PFPE exhibited higher water- and oil-repellency compared to polytetrafluoroethylene (PTFE).
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Kang Yuan, Yukari Yamazaki, Xiongjie Jin, Kyoko Nozaki
Summary: A tungsten- and zirconium-oxide-supported platinum catalyst was developed for the hydrogenolysis of esters to alkanes at low temperatures and ambient pressure. The catalyst showed high activity, selectivity, and could be reused multiple times without significant loss.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Takuya Higashi, Shuhei Kusumoto, Kyoko Nozaki
Summary: We report a vanadium(I) complex of cyclopentadienone, a low-valent early transition metal, which shows electron transfer from the metal to the ligand. The complex exhibits catalytic transformations and elementary reactions, known as metal-ligand cooperation.
Article
Chemistry, Inorganic & Nuclear
Koichiro Masada, Shuhei Kusumoto, Kyoko Nozaki
Summary: This article discusses the structure and reactivity of novel Ag(I) complexes with tridentate phosphabenzene ligands. An equilibrium between the dimer and the monomer was observed for the lambda 3-phosphabenzene Ag(I) complex in the solution state. The lambda 3-phosphabenzene Ag(I) complex can be oxidized by PhI(OAc)2 to afford lambda 5-phosphabenzene species while maintaining coordination to the metal center. The photochemical properties of the Ag(I) complexes were also investigated, and the emission of the lambda 3-phosphabenzene Ag(I) complex showed solvatochromic behavior.
Article
Polymer Science
Kazuki Tsuge, Kate Lau, Yuko Hirooka, Takanori Iwasaki, Katsuyuki Yokomizo, Kyoko Nozaki
Summary: In this study, copolymerization of ethylene or propylene with norbornenes functionalized with polar groups using various palladium catalysts was reported. The structural analyses of the copolymers and evaluation of their thermal properties were conducted. This work also demonstrated the coordination-insertion copolymerization of propylene with disubstituted polar olefins for the first time.
Article
Multidisciplinary Sciences
Takanori Iwasaki, Kazuki Tsuge, Naoki Naito, Kyoko Nozaki
Summary: This study reports an Ir catalyst for the selective hydrogenolysis of urea derivatives, achieving the transformation of less reactive carbonyl compounds in the presence of more reactive ones. The proposed catalyst showed tolerance to highly reactive carbonyl groups such as ester, amide, and carbamate, and exhibited high chemoselectivity towards urea. This research provides a new strategy for the chemical recycling of polyurea resins.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Kakeru Saito, Shuhei Kusumoto, Kyoko Nozaki
Summary: A novel cyclic bis(carbodiphosphorane) ligand was prepared and coordinated with group 13 elements, B, Al, and Ga. The ligand formed dinuclear adducts with Al and Ga, but formed a monomeric dicationic three-coordinate boron species with boron trichloride. X-ray crystallography revealed that the boron center in the dicationic compound had a strained trigonal geometry enforced by the cyclic structure. Theoretical investigation suggested the presence of tricationic two-coordinate boron resonance structure supported by the CDP ligands.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Koichiro Masada, Kiyosumi Okabe, Shuhei Kusumoto, Kyoko Nozaki
Summary: Bimetallic complexes with bridging ligands enable precise control of catalysis. This study prepared a dinuclear Rh(-i)/Rh(i) complex bridged by tridentate phosphine-phosphinine-phosphine ligands using reduction. X-ray analysis and DFT calculations showed that the phosphinine ligands adopted an unsymmetric bridging mode, accepting d-electrons from one Rh center and donating lone pairs to the other Rh center.
Article
Chemistry, Multidisciplinary
Yuki Ito, Akiya Adachi, Kohsuke Aikawa, Kyoko Nozaki, Takashi Okazoe
Summary: This paper discloses the palladium-catalyzed aminofluorination of styrenes using novel N-fluorobenzenesulfonimide (NFSI) derivatives with deprotectable substituents, and the selective deprotection and transformation of the resulting products into amines under mild reaction conditions.
CHEMICAL COMMUNICATIONS
(2023)
