Article
Chemistry, Multidisciplinary
Andrea N. Blankenship, Manoj Ravi, Mark A. Newton, Jeroen A. van Bokhoven
Summary: An efficient strategy for direct methane conversion involves protecting methanol by esterification to a more stable methyl ester. A new approach using a dispersed cobalt catalyst shows improved reaction conditions and competitive yields compared to traditional homogeneous catalytic methods. This method also utilizes a specific solvent system for product separation and recovery, enhancing overall efficiency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Hao-Xing Xu, Ze-Run Zhao, Yeersen Patehebieke, Qian-Qian Chen, Shun-Guo Fu, Shuai-Jun Chang, Xu-Xu Zhang, Zhi-Liang Zhang, Xiao Wang
Summary: A continuous-flow photocatalytic synthesis method has been developed for the industrially important thiuram disulfides, using O-2 as the oxidant and Eosin Y as the photoredox catalyst. This method offers reduced reaction time, excellent product yield, and purity, making it a sustainable and potentially scalable process for industrial production.
Article
Materials Science, Paper & Wood
Zahahe Oulame Mouandhoime, Francois Brouillette
Summary: A one-step procedure for obtaining modified fibers containing n-decyl phosphate cellulose is proposed. The reaction was performed at 150°C in heterogeneous conditions using n-decyl monophosphate and N,N-dimethylacetamide (DMAc) in the presence of kraft pulp fibers. Characterization techniques including solid-state nuclear magnetic resonance (C-13 and P-31-NMR), Fourier transform infrared spectroscopy, and energy dispersive X-ray spectroscopy confirmed the simultaneous addition of phosphorus and alkyl chains. The phosphorus content, determined to be 2.0%, was measured using UV-visible spectrophotometry. Results also showed that the phosphate groups were grafted with alkyl chains.
Article
Chemistry, Applied
William K. O'Keefe, Flora T. T. Ng, Garry L. Rempel
Summary: Two pilot scale experiments were conducted to investigate the one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen using catalytic distillation (CD) with a Pd/Nb2O5/SiO2 catalyst. The results showed that operation of the CD column at 83-97% reflux enabled the rapid in situ separation of water from the reactive section, resulting in increased MIBK productivity and hydrogen uptake efficiency by a factor of about 20.
Article
Green & Sustainable Science & Technology
Mabkhoot Alsaiari, Awais Bokhari, Lai Fatt Chuah, Muhammad Mubashir, Farid A. Harraz, Abdulaziz Ibrahim Almohana, Pau Loke Show, Mukesh Kumar Awasthi, Moustafa A. Rizk
Summary: This research demonstrates the application of hydrodynamic cavitation (HC) technology in the manufacturing of non-edible Hippophae rhamnoides (HiRO) seed oil. It is noted that the HC pilot assembly has not been used in any research pertaining to HiRO triglycerides biodiesel production. Optimizing the system for yield alone can only address one aspect of biodiesel production, and it is necessary to optimize both output and cavitational parameters for maximum efficiency in the transesterification reaction.
Article
Chemistry, Multidisciplinary
Pengcai Liu, Xing-Yu Chen, Jiawen Cao, Lukas Ruppenthal, J. Michael Gottfried, Klaus Muellen, Xiao-Ye Wang
Summary: This study revisited the nonbenzenoid nonalternant isomer of pyrene, Acepleiadylene (APD), and developed a new synthetic route for efficient access to APD. The unique electronic properties of APD were characterized compared to its benzenoid isomer pyrene, with its dipolar structure and narrow optical gap revealed. Functionalization of APD was demonstrated for the first time, paving the way for further research in nonbenzenoid nanographenes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Polymer Science
Ting Shen, Kaicheng Deng, Yuewei Chen, Yong He, Yang Zhu, Junting Xu, Jun Ling
Summary: Controlling the monomer sequence allows for predictable structure-property relationships in versatile polymeric materials. In this study, a series of thermoplastic elastomers with tailored thermal, mechanical, rheological, and degradable properties were synthesized through a facile synthesis method. The properties, including melting temperature, tensile strength, ductility, viscosity, and enzymatic degradability, were found to be governed by the block length of the multiblock copolymers.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Review
Polymer Science
Junpei Kuwabara, Takaki Kanbara
Summary: Conjugated polymers have immense potential in organic optoelectronic devices as semiconducting materials. To achieve mass production, synthetic methods must consider cost and environmental concerns, with simplification of synthetic steps being an efficient approach.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Energy & Fuels
Mamdouh S. Elmelawy, Asmaa El-Meligy, Hussien A. Mawgoud, Asmaa S. Morshedy, Samia A. Hanafy, Ibrahim El-tantawy El-sayed
Summary: In this study, trimethylolpropane triesters were successfully synthesized through a two-step transesterification process using oleic acid as a precursor. The produced triesters can serve as biodegradable lubricant base oil substitutes for mineral oils, leading to a significant reduction in environmental pollution. The effects of various operating parameters on the reaction were investigated, and the optimal conditions were determined. The synthesized triesters exhibited a suitable composition for their desired application.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Organic
Praput Thavornyutikarn, Chawanakorn Kongsak, Anurak Chailungka, Puracheth Rithchumpon, Thiti Junpirom, Puttinan Meepowpan
Summary: Protoconstipatic acid methyl ester was synthesized from a readily available compound. The reaction involved tandem aldol-lactonization, isomerization, and pyrolysis, resulting in an overall yield of 23%.
Review
Chemistry, Applied
Liqun Wang, Xiao Yan, Wenping Si, Daolan Liu, Xinggang Hou, Dejun Li, Feng Hou, Shi Xue Dou, Ji Liang
Summary: This review evaluates the latest progress in photocathode materials used in photoelectrochemical nitrogen reduction reaction (PEC-NRR) and discusses various types of photocathode materials and their relationship with PEC-NRR reaction mechanisms.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Organic
Desheng Zhan, Bin Yao, Chunyang Huan, Juan Lu, Yun Ji, Xiaofeng Zhang
Summary: A thermodynamic-promoting diastereoselective synthesis of dispirooxindole-pyrrolizines was developed using a five-component reaction and a dual 1,3-dipolar cycloadditions process. This process allows for the rapid assembly of fused pyrrolizines with two spirooxindoles bearing seven stereocenters. It utilizes homogeneous Bronsted acid catalysis and a benign solvent to promote a green process with by-products of CO2 and H2O, enhancing environmental tolerance.
TETRAHEDRON LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Kanae Sano, Nozomi Ishii, Satoshi Takahashi, Yoichi Takeda, Ichiro Matsuo
Summary: A simple and efficient synthetic strategy for oligomannose-type glycans was demonstrated, achieving different branching patterns through sequential regioselective α-mannosylation and inversion of configuration.
CARBOHYDRATE RESEARCH
(2023)
Review
Microbiology
Jinghui Lai, Huiqin Huang, Mengwei Lin, Youqiang Xu, Xiuting Li, Baoguo Sun
Summary: Petro-plastic wastes are a cause of serious environmental contamination, and alternative solutions and degrading methods are being developed. Bio-plastics such as PHAs, PLA, PCL, PBS, PEFs, and PES have emerged as promising alternatives. This review focuses on the sequences and structures of microbial enzymes catalyzing ester-bond synthesis in bio-plastics, and discusses enzymatic plastic degradation and recycling from an enzymatic point of view. The review also explores the hydrolysis of plasticizers in plastics.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Phillippa Cooper, Andrew G. Dalling, Elliot H. E. Farrar, Timothy P. Aldhous, Simon Grelaud, Eleanor Lester, Lyman J. Feron, Paul D. Kemmitt, Matthew N. Grayson, John F. Bower
Summary: The Ir-catalyzed alkene hydroarylation allows for the efficient synthesis of quaternary benzylic centers, and the structural features of the ligand play a crucial role in the reaction efficiency.
