Article
Chemistry, Physical
Anup Paul, Anirban Karmakar, M. Fatima C. Guedes da Silva, Armando J. L. Pombeiro
Summary: Two new 1D CPs have been prepared and characterized, showing potential as heterogeneous catalysts for tandem reactions under environmentally friendly conditions.
Article
Chemistry, Applied
Siming Ding, Yuanyuan Kong, Yuichi Manaka, Wang-Jae Chun, Ikuyoshi Tomita, Ken Motokura
Summary: The use of water as a reaction solvent is ideal for green chemistry, but carrying out catalytic reactions with transition metal catalysts in aqueous media is challenging. To enhance the scope of allylation reactions in water, a series of Pd diphosphine complexes co-immobilized with organic groups onto mesoporous silica supports was synthesized. The newly synthesized catalyst demonstrated improved catalytic allylation performance in water, expanding the toolkit of transition-metal-catalyzed reactions in aqueous media. The results have far-reaching consequences in academia and industry due to the wide use and scope of allylation reaction.
Article
Chemistry, Organic
Piyush N. Kalaria, Shailesh P. Satasia, Vishal B. Purohit, Jemin R. Avalani, Nirav H. Sapariya, Dipak K. Raval
Summary: A novel silica gel functionalized-SO3H catalyst was prepared and used for microwave-assisted solvent-free Pechmann condensation, showing good to excellent yields of 4-methyl coumarin derivatives in a shorter reaction time compared to conventional methods.
POLYCYCLIC AROMATIC COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Hong Zhang, Qiang Hu, Jutao Liu, Penghui Zhang, Shuaishuai Fu, Shang Wu
Summary: In this study, a metal-organic framework with an octahedral morphology supported by a tungstosilicic acid (TSA) nanocatalyst was successfully synthesized. The hybrid material showed high catalytic activity due to the synergistic effect of exposed metal iron sites and the supported Bronsted acid sites. The environmentally friendly nano-catalyst could be recycled multiple times without significant loss in catalytic performance. This study also provides insights into the application of porous organic polymer functionalization in organic synthesis.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mohammad Ali Karimi Zarchi, Farhad Hajati, Bibi Fatemeh Mirjalili
Summary: In this study, a cross-linked poly(4-vinylpyridine)-supported boron trifluoride catalyst was prepared and characterized. The catalyst showed good catalytic activity in the Biginelli reaction under solvent-free conditions, with advantages such as high yield, short reaction time, and reusability.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Energy & Fuels
Haris Mahmood Khan, Tanveer Iqbal, M. A. Mujtaba, Manzoore Elahi M. Soudagar, Ibham Veza, I. M. Rizwanul Fattah
Summary: Biodiesel, a promising renewable fuel, has gained global attention for replacing fossil fuels using heterogeneous catalysts to accelerate reactions. Research shows that utilizing microwave technology in heterogeneously catalysed transesterification greatly reduces reaction times while maintaining or improving catalytic activity.
Article
Chemistry, Physical
Phuoc Thi Pham, Hai Truong Nguyen, The Thai Nguyen, Linh Ho Thuy Nguyen, Minh-Huy Dinh Dang, Tan Le Hoang Doan, Dung Duc Pham, Cong Tien Nguyen, Phuong Hoang Tran
Summary: This paper investigates the environmentally friendly synthesis of benzoxazoles through the cyclization of 2-aminophenols and benzaldehydes using deep eutectic solvent (DES) as a catalyst under microwave irradiation. [CholineCl][oxalic acid] was synthesized and used as a catalyst, and it exhibited good conversion and selectivity. The presence of [CholineCl][oxalic acid] promoted the rapid heating transfer from microwave irradiation and it can be reused multiple times without significant degradation in catalytic activity.
Article
Chemistry, Applied
Neda Heydari, Rahman Bikas, Maryam Shaterian, Tadeusz Lis
Summary: A dioxidotungsten(VI) complex was prepared and supported on silica gel to obtain a heterogeneous catalyst. The catalyst showed high activity and stability in the oxidation of benzyl alcohols, with its selectivity depending on the reaction conditions.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
P. S. Pharande, G. S. Rashinkar, D. M. Pore
Summary: A silica-grafted DBU-supported NiCl2 complex, SiO2@DBU-NiCl2, was synthesized and characterized. The catalytic activity of SiO2@DBU-NiCl2 was explored for A(3) coupling of terminal alkynes, aldehydes, and secondary amines, resulting in high yields (up to 97%). The protocol exhibited high TONs (625-1212) and TOFs (52-404), low catalyst loading (0.08 mol%), solvent-free conditions, and facile recyclability and reusability of the catalyst (up to 5 times).
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Environmental Sciences
Shengquan Zeng, Eunsung Kan
Summary: One-step FeCl3-mediated pyrolysis/activation was developed for preparation of bermudagrass-derived FeCl3-activated biochars (FA-BCs) as a heterogeneous Fenton catalyst for heterogeneous Fenton oxidation of sulfamethoxazole (SMX) in water. The FA-BC prepared at the FeCl3 to BG mass ratio of 2 exhibited higher adsorption and Fenton oxidation of SMX than other mass ratios. SMX and COD removal efficiencies reached 99.94% and 65.19% respectively under the optimal conditions for Fenton reaction.
Article
Chemistry, Applied
Neda Heydari, Rahman Bikas, Maryam Shaterian, Marta S. S. Krawczyk, Tadeusz Lis
Summary: Vanadium coordination compounds, [VO2L]center dot(CH3OH) (1a and 1b), were prepared and characterized. The silica-supported catalyst Si-VO2L was obtained and employed as a heterogeneous catalyst in the oxidation of styrene derivatives. The effects of substituents on the phenyl ring of styrene on the selectivity and activity of Si-VO2L were investigated.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Nidhi Yadav, Gaurav Yadav, Md. Ahmaruzzaman
Summary: A reusable SO3H functionalized heterogeneous catalyst was prepared from walnut shell powder and used for the conversion of oleic acid to methyl oleate. Under optimized conditions, a conversion rate of 99.01% was achieved. This sustainable catalyst utilizes agricultural waste, exhibits high lignin content, and can be reused for multiple reaction cycles.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Monika Sharma, Goldi Sharma, Sandeep Kaushal, Rahul Badru
Summary: In this study, DHPM analogs of Vanillin were synthesized in a one-step Biginelli condensation using a Eu-Gd@BiPO4 nano-composite catalyst. The catalyst showed high efficiency and the reaction provided good yields in a short time under solventless conditions. The synthesized compounds exhibited promising antioxidant and antibacterial activities.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Hu Zhang, Zhaoyu Zhang, Zhengguo Cai, Mingyuan Li, Zhen Liu
Summary: The development of heterogeneous late transition metal catalysts for olefin (co)polymerization has been investigated. The preparation of heterogeneous anilinonaphthoquinone nickel and palladium catalysts has been reported. The nickel catalyst showed high activity for ethylene polymerization, producing high-molecular-weight polyethylenes with well-regulated morphologies. The palladium catalyst promoted copolymerization of ethylene with commercial methyl acrylate or norbornene derivatives, leading to functionalized polyethylene and cyclic olefin copolymers.
Article
Chemistry, Physical
Hu Zhang, Zhaoyu Zhang, Zhengguo Cai, Mingyuan Li, Zhen Liu
Summary: The development of heterogeneous late transition metal-catalyzed olefin (co)polymerization is challenging. This study reports the preparation of heterogeneous anilinonaphthoquinone nickel and palladium catalysts. The nickel catalyst exhibits very high activity and can produce high-molecular-weight semicrystalline polyethylenes. The polymerization behavior is influenced by the electron density of the metal center and the Lewis acidity of the alkylaluminum. The palladium catalyst promotes copolymerization of ethylene with methyl acrylate or polar norbornene derivatives.
