Article
Polymer Science
Qiang Gui, Changou Pan, Siwei Shen, Pengwei Xie, Mingliang Pei, Peng Liu
Summary: Fluorination of nitrile-butadiene rubber (NBR) was efficiently achieved through olefin cross metathesis (OCM) technique using 1H,1H,2H,2H-perfluorooctyl acrylate (F13) as the model fluorinating chain transfer agent (F-CTA). The optimized conditions led to a liquid F-NBR with a fluorination degree of 1.84%, and the reaction process was elucidated based on changes in fluorination degree and molecular weight of the F-NBR products.
Article
Chemistry, Physical
Tanmayee Nanda, Shyam Kumar Banjare, Wang-Yeuk Kong, Wentao Guo, Pragati Biswal, Lokesh Gupta, Astha Linda, Bedadyuti Vedvyas Pati, Smruti Ranjan Mohanty, Dean J. Tantillo, Ponneri C. Ravikumar
Summary: A catalytic system has been discovered for the intramolecular C-H amidation of N-phenoxy acetamide derivatives. The use of a cobalt catalyst and maleimide as a transient mediator enables the olefin-mediated ortho C-H functionalization. Mechanistic and DFT studies provide support for the proposed mechanism. The products derived from this methodology have been demonstrated as ligands in the C-H olefination reaction.
Article
Chemistry, Organic
Shuai Zhao, Bin-Wei Lu, Ning Bao, Zi-Jian Yin, Mingcheng Qian, Lin Cao, Min Geng, Ye Lin, Xin Chen
Summary: A palladium-catalyzed oxidative amidation reaction between conjugated olefin and 2-pyridone is presented, enabling the synthesis of a range of E-enamides with high stereocontrol. The method also allows for the generation of cyclic and acyclic amides. The formation of predominantly Z-enamides for primary amides may be attributed to the presence of an intramolecular hydrogen bond. The synthesis of enamide on a gram-scale and subsequent oxidative annulation with diphenylacetylene highlights the synthetic utility of this reaction.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Chaoyang Kuang, Zhangjun Hu, Zhongcheng Yuan, Kaichuan Wen, Jian Qing, Libor Kobera, Sabina Abbrent, Jiri Brus, Chunyang Yin, Heyong Wang, Weidong Xu, Jianpu Wang, Sai Bai, Feng Gao
Summary: This study demonstrates greatly improved operational stability of high-efficiency PeLEDs by incorporating dicarboxylic acids into the precursor for perovskite depositions. The stable amides formed through an in situ amidation process prevent detrimental reactions between the perovskites and the charge injection layer, ensuring excellent operational stability. By optimizing the amidation reaction in the perovskite emissive layers, efficient PeLEDs with a peak external quantum efficiency of 18.6% and a long half-life time of 682 h at 20 mA cm(-2) have been achieved, representing a significant breakthrough in PeLEDs.
Article
Chemistry, Physical
Changou Pan, Peng Liu
Summary: Clays have been widely used after surface modification. This study focused on optimizing the reaction conditions between NBR and Pal NRs to produce various products with potential applications, such as nano-reinforcing agents, self-separable adsorbents, or Pickering surfactants.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Organic
Kyeongna Park, Gi Uk Han, Sugyeong Yoon, Eunseo Lee, Hee Chan Noh, Kyungsup Lee, Chanyoung Maeng, Dongwook Kim, Phil Ho Lee
Summary: A regioselective B(4)-H amination reaction was developed using Iridium(III) catalyst from the reaction of o-carborane acids with sulfilimines, without the need for oxidants under mild conditions. This reaction resulted in a wide range of B(4)-H aminated o-carboranes in good yields and with a broad substrate scope. Additionally, selective B(3,6)-diamination of the o-carborane acid was achieved. One practical advantage of this reaction is the quantitative recovery and reuse of dibenzothiophene.
Article
Chemistry, Multidisciplinary
Tomohiro Hattori, Hisashi Yamamoto
Summary: Efficient and straightforward peptide bond formation of unprotected N- and C- terminal amino acids was achieved using trimethylaluminum. This reaction system allows one-pot tripeptide synthesis without the need for expensive coupling reagents, even for amino acids with bulky substituents. Furthermore, peptide elongation can be achieved by adding amino acids and trimethylaluminum. This cost-effective and efficient protocol holds promise for the synthesis of a wide variety of peptides.
Article
Chemistry, Physical
Bingjie Ding, Beibei Xu, Zuoji Ding, Tong Zhang, Yajun Wang, Hewen Qiu, Jingjing He, Pengfei An, Yefeng Yao, Zhenshan Hou
Summary: This study demonstrates that tartaric acid-coordinated peroxoniobate salts are highly efficient catalysts for the oxidative coupling of aromatic amines. The salts exhibit exceptional catalytic performance and selectivity, and the reaction can proceed under mild and green conditions. Mechanistic studies reveal that the reaction follows a catalytic mechanism, and hydrogen bond interactions play a crucial role in the selective oxidation process. This is the first work to show the potential of peroxoniobate salts as catalysts for the oxidation of aromatic amines.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Review
Chemistry, Applied
Shimin Kang, Rongrong Miao, Jianfeng Guo, Jinxia Fu
Summary: Niobium-based catalysts have shown great potential in catalytic conversion of biomass to fuels and chemicals, with applications ranging from catalytic hydrolysis/dehydration to catalytic esterification and hydrogenation. This review provides a comprehensive overview of the special characteristics and diverse applications of Nb-based catalysts in the bioenergy field, serving as a basis for future research.
Article
Chemistry, Multidisciplinary
Wataru Muramatsu, Hisashi Yamamoto
Summary: A one-pot peptide bond-forming reaction has been developed using unprotected amino acids and peptides, with the help of two different silylating reagents and catalysts. This method is versatile, providing high yields of corresponding peptides without racemization or polymerization.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Organic
Karuna Veeramani, Manish Shinde, Vishnuvardhana Vema Reddy Eda, Bala Chennaiah Darapaneni, Rama Mohan Hindupur, Srinivasa Rao Madarapu, Saikat Sen, Srinivas Oruganti
Summary: Scalable alternate end-game strategies for the synthesis of the anti-COVID drug molecule Nirmatrelvir have been proposed. The first strategy involves a direct synthesis of the molecule through amidation reaction, while the second strategy utilizes a continuous flow synthesis mediated by T3P for more efficient conversion. The final product obtained from these strategies demonstrates comparable quality attributes to those obtained from traditional batch processes.
TETRAHEDRON LETTERS
(2023)
Article
Chemistry, Organic
Yongdi Wu, Na Liu, Meifang Qi, Huihao Qiao, Xuelian Lu, Li Ma, Yirong Zhou, Fang-Lin Zhang
Summary: 2-Fluoro-5-(trifluoromethyl)aniline is a suitable MonoTDG for enabling Ru(II)-catalyzed ortho-C(sp(2))-H imidation of benzaldehydes. N-Tosyloxyphthalimide serves as an alternative amidation reagent, allowing for high efficiency and good functional group tolerance. The reaction can be scaled up to gram scale and the amidated product can be easily converted into valuable scaffolds with one-step derivatization.
Article
Chemistry, Physical
Tatsuki Nagata, Shunsuke Aratani, Moegi Nomura, Maito Fuji, Taichi Sotani, Hiromitsu Sogawa, Fumio Sanda, Tatsuo Yajima, Yasushi Obora
Summary: The ring-opening metathesis polymerization (ROMP) of cyclic olefins with niobium(V) pentaalkoxide catalysts was investigated, and the presence of zinc, benzylidene dichloride, and chlorotrimethylsilane led to the formation of in situ niobium species and the successful ROMP reaction. Among the niobium pentaalkoxide group, Nb(OEt)5 exhibited the smallest polymer dispersity value and provided trans selective polynorbornene. This paper discussed the role of additives and elucidated the synthesis process of the polymer using the Nb(OEt)5/TMSCl/Zn/PhCHCl2 system, along with the characterization of the intermediate species using various measurements.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Debasish Dutta, Trishnajyoti Baishya, Rosa M. Gomila, Antonio Frontera, Miquel Barcelo-Oliver, Akalesh K. Verma, Manjit K. Bhattacharyya
Summary: Two new coordination compounds of Zn(II) with cyanopyridine ligands have been synthesized and characterized. Unusual pi(CN)-pi interactions and anion-n interactions contribute to the stability of the crystal structures. The compounds exhibit significant cytotoxicity and interact effectively with antiapoptotic proteins.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
M. Chebanenko, V. Popkov, H. Schroettner, A. A. Sushnikova, A. A. Rempel, A. A. Valeeva
Summary: This work investigates the production of nano-sized niobium oxides with different crystal structures through the thermal treatment of nonstoichiometric nanocrystalline niobium carbide. The obtained nanopowders exhibit high sorption capacity and photocatalytic activity, with the latter reaching its maximum for the higher niobium oxide Nb2O5.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Guojun Hu, Ziyue Deng, Yanwei Wang, Dan Yuan, Yong Zhang, Yingming Yao
Summary: A series of rare-earth metal complexes were synthesized and used as efficient initiators for the polymerization of trimethylene carbonate (TMC) and (L)-lactide ((L)-LA).
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Van Ha Nguyen, John H. K. Yip
Summary: In this study, eight PtII-azulene complexes were synthesized to investigate the effect of metalation on the electronic structures, spectroscopy, and luminescence of organic chromophores. The results showed that the attachment of Pt substituents to azulene affected the HOMOs, LUMOs, and luminescence properties. The study provides insights into the role of metalation in modifying the properties of organic chromophores.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Moon Kedia, Virender Singh, Bhaskaran Shankar, Malaichamy Sathiyendiran
Summary: This study synthesized two types of neutral binuclear metallocycles using a one-pot solvothermal method and characterized their structures. The analysis revealed that these complexes adopt a binuclear heteroleptic cyclic architecture and belong to phosphine oxide donor (P=O)-based supramolecular coordination cyclic complexes.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Radhey S. Srivastava
Summary: This study demonstrates the effectiveness of zero-valent elements as reductants for the deoxydehydration reaction of polyols catalyzed by ONO-pincer ligated molybdenum dioxo. The insolubility and easy separability of the reductants and their oxidized products during the reaction are emphasized. Additionally, the choice of ligand has an impact on the catalytic performance of the reaction.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Hao Zhou, Yajun Sun, Li Deng, Weiran Yang, Yuehui Li
Summary: Efficient Ru-catalyzed hydrogenation of aldehydes was achieved using carbazole-derived phosphine ligands, with the crucial role of N-H moiety in promoting the catalytic reaction. The method was successfully applied in the Co/Ru-catalyzed hydroformylation process, resulting in the production of long-chain alcohols with excellent yields.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Theodor Danescu, Alexandru Lupan, Radu Silaghi-Dumitrescu, R. Bruce King
Summary: The structures and energies of complexes containing (Me2C2N2P)2Ru2(CO)n and (Me2C2N2P)2Fe2(CO)n have been studied. Low-energy structures are characterized by the presence of bridging diazaphospholyl rings, while higher-energy structures involve different ligand structures.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Savannah C. Kapper, Aamani Ponnekanti, Jonas Schaab, Tian-yi Li, Christine L. Chung, Gael Ung, Peter I. Djurovich, Mark E. Thompson
Summary: Organometallic iridium complexes with two cyclometalated ligands and one bis-oxazoline derived ancillary ligand were studied. These complexes have emission spanning across the visible and near-ultraviolet region, with moderate to high photoluminescence quantum yields. The (ppy)2Ir(BOX-CN) complexes were resolved into Delta- and Lambda-diastereomers based on solubility differences.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Zahra Karimi Sangari, Hossein Naeimi
Summary: In this research, a nanostructured CoCuFe2O4 catalyst was prepared using a brief and useful synthetic strategy. This catalyst was used for synthesizing 1,2,4,5-tetrasubstituted imidazole derivatives under ultrasonic irradiation. The approach offers advantages such as high efficiency, short reaction times, simplicity of the reaction medium, accelerated reaction rates, and easier separation and purification of products.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Rukhsana Gul, Wajid Munir, Ebraheem Abdu Musad Saleh, Shaukat Shujah, Muhammad Sirajuddin, Saira Tabassum, Khalil Ur Rehman, Dilfaraz Khan, Sameerah I. Al-Saeedi, Ehab A. Abdelrahman
Summary: Two new Schiff base ligands were synthesized and used to form copper, nickel, and cobalt complexes. The synthesized compounds were characterized and screened for various biological activities. The metal complexes showed better activities in antibacterial, antifungal, antidiabetic, and antioxidant assays.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Review
Chemistry, Inorganic & Nuclear
Ahsan Nazir, Pengwei Huo, Ameena Tur Rasool
Summary: This review explores the potential of g-C3N4-based S-scheme heterojunctions in addressing environmental issues. It summarizes the mechanism and preparation techniques of S-scheme heterojunctions based on g-C3N4, and presents recent studies on their applications in pollutant removal, CO2 reduction, hydrogen production, and bacterial disinfection. The review concludes with an outlook on future challenges for g-C3N4-based S-scheme heterojunctions.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Francois Mazars, Koffi Senam Etse, Guillermo Zaragoza, Lionel Delaude
Summary: The activity of three Pd-PEPPSI catalyst precursors with N-heterocyclic carbene (NHC) ligands derived from caffeine and theophylline in Mizoroki-Heck reactions was tested. The results showed that the catalysts achieved high conversions and yields, especially in the presence of electron-withdrawing substituents.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Bo-Han Wu, Xue Zhou, Lin Liu, Zheng-Bo Han
Summary: Researching carbon dioxide removal from flue gas and natural gas is crucial. Metal-organic frameworks (MOFs) are commonly used in adsorption due to their high surface area, porosity, and chemical properties. An ultra-microporous MOF CPM-20(Co) with mixed ligand was synthesized using inexpensive ligands. The material exhibited high selectivities and low regenerative energy, making it a promising option for CO2 separation in industries.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)