Article
Chemistry, Applied
Kuikui Zhang, Zhenbang Liu, Ning Liu
Summary: A three-component catalytic system was developed, involving benzimidazolium salts, CrCl2, and TBAB, with each component playing a distinct role in the catalytic process as clarified by control experiments and spectroscopic measurements. The terminal epoxides showed high reactivity in the catalytic system under mild conditions, while increasing the temperature, CO2 pressure, and/or prolonging the reaction time also enhanced catalytic activity for internal epoxides.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Polymer Science
David K. Tran, Ahmed Z. Rashad, Donald J. Darensbourg, Karen L. Wooley
Summary: The synthetic transformation of d-xylose into a four-membered cyclic ether enables reactions with carbon dioxide to produce linear polycarbonates through either one-step ring-opening copolymerisation (ROCOP) directly or sequential isolation of a preformed six-membered cyclic carbonate followed by ring-opening polymerisation (ROP).
Article
Polymer Science
Yao Chen, Wenchuan Wang, Dong Xie, Lili Wu, Chaocan Zhang
Summary: The binary catalyst of TPPAlCl-PPN+Cl- can effectively initiate the copolymerization of CO2, lactide, and epoxide, leading to the formation of multiblock poly(carbonate-co-lactide) products. The functionality and glass-transition temperature of the products can be easily adjusted by varying the copolymerization variables.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Rui Yan, Kai Chen, Zhenjiang Li, Yuanyuan Qu, Luoyu Gao, Haoying Tong, Yongqiang Li, Jie Li, Yongzhu Hu, Kai Guo
Summary: Halogen bonding, similar to hydrogen bonding, was introduced into the catalytic cycloaddition of carbon dioxide into epoxide reactions. A series of halogen-bond donor catalysts containing N-iodopyridinium halide were synthesized and evaluated, with 4-(dimethylamino)-N-iodopyridinium bromide identified as the optimal catalyst. The mechanism of halogen-bonding catalysis was proposed and demonstrated through successful CCE reactions.
Article
Chemistry, Applied
Tianxiang Zhao, Guangcai Long, Hua Liang, Wenjie Xiong, Xingbang Hu
Summary: A series of [Im][HCO3]@SBA-15 supported ionic liquids (SILs) catalysts were prepared by anion exchange and solvent-free mehcanochemical grafting strategies for the direct synthesis of cyclic carbonates from olefins and CO2. The as-prepared [Im][HCO3]@SBA-15 catalysts exhibited excellent catalytic activity and selectivity for the one-pot synthesis of cyclic carbonates, providing moderate to excellent yields. The catalysts showed excellent reusability and stability, making them a promising option for CO2 conversion.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Sergei A. Chernyak, Alexander L. Kustov, Dmitrii N. Stolbov, Marina A. Tedeeva, Oksana Ya. Isaikina, Konstantin I. Maslakov, Nadezhda V. Usol, Serguei V. Savilov
Summary: The study utilized different carbon materials as supports for Cr-based catalysts in CO2-assisted ODP, with oxidized CNT and pristine GNF supported catalysts exhibiting the best activity and propylene yield. The stability of these catalysts was attributed to their macro- and mesoporosity enhancing reagent and product diffusion, as well as the highest surface graphitization degree. GNFs and CNTs were found to be effective supports for CO2-ODP catalysts, outperforming activated carbon-supported catalysts.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Haoying Tong, Yuanyuan Qu, Zhenjiang Li, Jun He, Xin Zou, Yi Zhou, Tong Duan, Bo Liu, Jie Sun, Kai Guo
Summary: Cycloaddition of CO2 into epoxides (CCE) reaction is a commercially viable chemical process, but the use of halide anion as a co-catalyst poses potential issues. To address this, we propose a halide-free catalyst composed of saccharin and a strong pyridine base. The results show that this catalyst can efficiently convert epoxides into cyclic carbonates under mild conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Jun Liu, Longhui Yu, Changwu Zheng, Gang Zhao
Summary: The asymmetric synthesis of 2,2-difluorinated tetrahydrofurans was achieved through palladium-catalyzed enantioselective formal [3+2] cycloaddition, resulting in enantioenriched products with up to 98% selectivity. The use of readily available (R)-BINAP ligand at a low loading enabled the production of a wide variety of difluorinated compounds in moderate to high yields, with the ability to obtain both chiral diastereomers in a single sequence.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Energy & Fuels
Bo Liu, Tong Duan, Zhenjiang Li, Weizhou Huang, Jinlan Li, Tianyu Zhu, Canliang Ma, Jie Sun, Kai Guo
Summary: The metal-and halide-free catalyst DABCO center dot HSac, consisting of 1,4-diazabicyclo[2.2.2]octane (DABCO) and saccharin (HSac), effectively catalyzes the cycloaddition of CO2 into epoxides. The catalytic cycle involves the nucleophilic attack of the saccharinate anion on the methylene carbon of the epoxide ring, while the onium cation DABCO-H+ activates the epoxide. The use of non-halide anions as nucleophiles in halide-free catalyst design expands the possibilities for catalyst discovery.
Article
Chemistry, Multidisciplinary
Xiaoqing Yang, Zimin Liu, Peng Chen, Fei Liu, Tianxiang Zhao
Summary: In this study, a series of bio-based deep eutectic solvents (DESs) were synthesized for catalyzing the cycloaddition reaction of CO2 with epoxides. The AcChBr-LMA (2:1) DES, formed by acetylcholine bromide (AcChBr) and L-malic acid (LMA), showed the highest catalytic activity (up to 98% yield) and excellent recyclability under mild conditions. Mechanism studies revealed a synergistic catalytic effect between the hydrogen bond acceptor (HBA) and hydrogen bond donor (HBD).
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Multidisciplinary
Jianfei Sun, Xintong Li, Kunpeng Yu, Jianzhong Yin
Summary: In this study, a novel supported ionic liquid membrane was developed for efficient synthesis of propylene carbonate. The catalytic stability and structure of the membrane were verified through experiments and characterization. The process parameters of continuous membrane catalysis were evaluated, and the essential factors for large-scale CO2 conversion were identified.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Physical
Elisa Hernandez, Ruben Santiago, Cristian Moya, Pablo Navarro, Jose Palomar
Summary: This study proposes the use of amino acid based ionic liquids as catalysts to promote the conversion of CO2 with propylene oxide to produce propylene carbonate. Experimental results demonstrate that aa-ILs with higher CO2 absorption capacity can catalyze the reaction more effectively.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Zonglin He, Wenqi Xian, Zhu Ding, Chaozhi Wang, Zhenhong Huang, Lina Song, Baohua Liu
Summary: In this study, propylene carbonate diols (PCDs) were synthesized and used as extenders to prepare waterborne polyurethane (WPU). The properties of PCD-based WPUs were compared to those of WPU using butane-1,4-diol (BDO) as an extender. The results showed that WPU films derived from PCDs exhibited superior mechanical properties, adhesion, and thermal stability.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Chemistry, Inorganic & Nuclear
Yanwei Wang, Xuehua Zhu, Yong Zhang, Dan Yuan, Yingming Yao
Summary: The synthesis and characterization of six dinuclear cobalt complexes bearing a conjugated macrocyclic ligand were reported. The complexes were applied in the copolymerization of CO2 and cyclohexene oxide, and showed good reactivity and selectivity.
Article
Chemistry, Multidisciplinary
Vera I. Isaeva, Maria N. Timofeeva, Ivan A. Lukoyanov, Evgeny Yu. Gerasimov, Valentina N. Panchenko, Vladimir V. Chernyshev, Lev M. Glukhov, Leonid M. Kustov
Summary: In this study, novel composite materials based on calix[4]arene with hydroxyl groups in the arene bowl and the aluminum(III) 2-aminoterephthalate metal organic framework have been synthesized. The effect of synthesis method on the properties of the composites was demonstrated, and the MIL/K-OH(Solv) catalyst showed higher activity in the coupling reaction of CO2 and propylene oxide.
JOURNAL OF CO2 UTILIZATION
(2022)
