Article
Chemistry, Multidisciplinary
Elaine C. Reichert, Kaibo Feng, Aaron C. Sather, Stephen L. Buchwald
Summary: We report a versatile method for the Pd-catalyzed C-N cross-coupling of heteroaryl halides with primary and secondary amines, achieving good-to-excellent yields. The use of a specific base and a supported Pd catalyst enables the coupling of challenging heteroarenes and sterically demanding amines. This method has broad applicability and allows the synthesis of densely functionalized medicinal chemistry building blocks.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Xiaorui Zhao, Xiaojuan Zhu, Kang Wang, Junqian Lv, Shangjun Chen, Guohua Yao, Junyu Lang, Fei Lv, Yinghui Pu, Ruoou Yang, Bingsen Zhang, Zheng Jiang, Ying Wan
Summary: Traditional approaches for transition-metal catalyzed oxidative cross-coupling reactions rely on sp(2)-hybridized starting materials. Here the authors report a novel heterogeneous Pd-catalyzed radical relay method for the conversion of a heteroarene C(sp(3))-H bond into ethers with high efficiency and selectivity.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Benni Du, Weichao Zhang
Summary: A theoretical study was conducted on the gas-phase decomposition of azidoacetone using ab initio molecular orbital theory. The results showed the formation of crucial intermediates and key reaction pathways, which were consistent with experimental findings.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Polymer Science
Sajjad Dadashi-Silab, Khidong Kim, Francesca Lorandi, Grzegorz Szczepaniak, Stephanie Kramer, Linda Peteanu, Krzysztof Matyjaszewski
Summary: In this study, a dual photoredox catalytic system was developed for photoinduced ATRP under red-light irradiation, avoiding the problems associated with UV light activation of the catalyst. The system showed oxygen tolerance due to the consumption of oxygen in the photoredox reactions, resulting in well-controlled polymerizations without the need for deoxygenation processes.
Article
Chemistry, Multidisciplinary
Lihua Wan, Xiaoya Zang, Juan Fu, Xuebing Zhou, Jingsheng Lu, Jinan Guan, Deqing Liang
Summary: Experimental evidence showed that confined methane hydrates in nanosilica gel can dissociate into ultra viscous low-density liquid water and methane gas. The dissociation process depends on the phase state of water.
Article
Chemistry, Physical
Keijiro Ohshimo, Ryosuke Sato, Yuya Takasaki, Kengo Tsunoda, Ryosuke Ito, Manabu Kanno, Fuminori Misaizu
Summary: This study demonstrates the efficient proton transfer between two protonation sites in protonated p-aminobenzoic acid using a single ammonia molecule as a vehicle.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Chemistry, Inorganic & Nuclear
David M. Stanbury
Summary: The iron-catalyzed disproportionation of H2O2 and the Fenton reaction have been studied for over a century, but little attention has been paid to ensuring the conformity of proposed mechanisms with the principle of detailed balancing. More than 200 publications with mechanisms violating this principle have been identified. A core mechanism consistent with detailed balancing is proposed for the iron-catalyzed decomposition of H2O2.
DALTON TRANSACTIONS
(2022)
Article
Multidisciplinary Sciences
Lei Liu, Maria Camila Aguilera, Wes Lee, Cassandra R. Youshaw, Michael L. Neidig, Osvaldo Gutierrez
Summary: Transition metal-catalyzed cross-coupling reactions are widely used in chemical synthesis. Iron (Fe) has potential advantages as a cheaper, more abundant, and less toxic catalyst, but its practical application in multicomponent cross-couplings remains challenging. Research demonstrates successful coupling of alpha-boryl radicals with Grignard reagents using 1,2-bis(dicyclohexylphosphino)ethane Fe-catalyzed reactions, and further development of a broadly applicable Fe-catalyzed multicomponent annulation-cross-coupling protocol.
Article
Chemistry, Physical
Alexandra Lisovskaya, Oleg Shadyro, Olav Schiemann, Ian Carmichael
Summary: This study investigated the reactions between OH radicals and the hydrophilic part of sphingolipids using model compounds, revealing different reaction properties. Radical intermediates formed in the reactions were characterized using various methods, and quantum chemical calculations were utilized to interpret the experimental data. The main process observed for all compounds studied was H-abstraction from the terminal carbon atom, with the presence of an unsubstituted amino group shown to significantly alter the reaction properties of serinol.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Amanda K. Turek, Marcus H. Sak, Scott J. Miller
Summary: The kinetic studies of a VCP cycloaddition catalyzed by peptide-based thiyl radicals show that the ring-opening of VCP is crucial for both the rate and enantioselectivity. Noncovalent interactions play key roles in disrupting unproductive self-aggregation of both the peptide catalyst and VCP. The presence of a substituent at the 4-position of the proline residue is essential for both turnover/rate and selectivity, explaining the requirement for this key catalyst feature.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Javier Carmona-Garcia, Antonio Frances-Monerris, Carlos A. Cuevas, Tarek Trabelsi, Alfonso Saiz-Lopez, Joseph S. Francisco, Daniel Roca-Sanjuan
Summary: This study investigates the photochemical behavior of hydroxysulfinyl radical, revealing that its major solar-induced channel is photocleavage to HO + SO, with a minor contribution of H + SO2 photoproducts. The efficient generation of SO is relevant due to its reactivity with O(3) and subsequent depletion of ozone in the stratosphere.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Jari Peltola, Prasenjit Seal, Niko Vuorio, Petri Heinonen, Arkke Eskola
Summary: This study directly measured the thermal unimolecular reaction of (CH3)(2)COO using a new photolytic precursor and found that this reaction is more important in the atmosphere than previously suggested. The reaction rate of (CH3)(2)COO at 296 K and atmospheric pressure was determined to be 899 +/- 42 s(-1).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Maryam Seyed Sharifi, Hamed Douroudgari, Morteza Vahedpour
Summary: This study investigated the reaction mechanisms and kinetics of thiophene oxidation reactions initiated by hydroperoxyl radical using high-level DFT and ab initio calculations. The results showed that the addition reactions to the alpha and beta carbons of thiophene in the initial steps of the reaction were the most favored pathways. Furthermore, a variety of products were obtained in this complex oxidation reaction, with faster addition reactions to the alpha and beta carbons at lower temperatures and more competitive multi-step parallel reactions at higher temperatures.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Shiwen Huang, Xinjian Su, Yanzhen Wu, Xiao-Gen Xiong, Yiliu Liu
Summary: In this study, triaminocyclopropenium (TAC) iodides were used as highly potent catalysts for halogen-bonding catalyzed living radical polymerization. The unique effect of ion-pair strain between the TAC cation and the iodide anion promoted high catalytic efficiency in halogen-bonding catalysis. The TAC iodides showed general applicability and surpassed previously reported organic iodide catalysts. Furthermore, the TAC-iodides also showed promising feasibility in catalyzing radical depolymerization.
Article
Chemistry, Inorganic & Nuclear
Bapan Samanta, Riya Ghosh, Rakesh Mazumdar, Shankhadeep Saha, Sayani Maity, Biplab Mondal
Summary: Researchers synthesized a Co(II) complex with a bidentate ligand and observed the corresponding transient intermediate through experiments. This study is important for understanding the reaction mechanism of the complex.
DALTON TRANSACTIONS
(2023)
