Article
Chemistry, Multidisciplinary
Shuqi Kong, Mengyao Zhang, Shiyu Wang, Hongli Wu, Hongyan Zou, Genping Huang
Summary: Density functional theory calculations were used to study the palladium-catalyzed remote diborylative cyclization of dienes. The computations revealed a Pd(II)/Pd(IV) catalytic cycle and the involvement of a high-valent Pd(IV) species in the sigma-bond metathesis between the alkylpalladium intermediate and B(2)pin(2) via B-B oxidative addition/C-B reductive elimination. The diastereoselectivity was found to be determined by the migratory insertion into the Pd-C bond, influenced by torsional strain, steric repulsion, and C-H-O hydrogen bonding.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Hongli Wu, Lingfei Hu, Yu Shi, Zhen Shen, Genping Huang
Summary: Palladium/boron-catalyzed allylic substitution of vinylethylene carbonates with water provides a powerful approach for the enantioselective synthesis of the tertiary C-O bond. Density functional theory calculations in the present work show that the nucleophilic attack via a distinctive type of chelation-assisted inner-sphere pathway is responsible for the experimentally observed regio- and enantioselectivities.
Article
Chemistry, Multidisciplinary
Xiaolei Ji, Chaoren Shen, Xinxin Tian, Hongru Zhang, Xinyi Ren, Kaiwu Dong
Summary: In this study, a Pd-catalyzed asymmetric double hydroxycarbonylation of terminal alkynes was developed using relay catalysis, which provided an efficient route to chiral succinic acids. This method demonstrated high yields and enantioselectivity for 41 examples and showcased its synthetic utilities in the facile synthesis of key intermediates for chiral pharmaceuticals.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Wenlong Ren, Xujian Sheng, Chengcheng Fan, Yian Shi
Summary: This study describes a regioselective Pd-catalyzed hydrocarboxylation of vinyl arenes with oxalic acid. A wide range of linear or branched carboxylic acids can be easily obtained with high regioselectivities under mild reaction conditions. The reaction process is operationally simple and does not require handling toxic CO. In addition to the ligand, the counteranion of the Pd catalyst system plays an important role in the regioselectivity.
Article
Chemistry, Multidisciplinary
Kotaro Yamashita, Kota Sato, Yutaka Tanji, Jun-ya Hasegawa, Tetsuaki Fujihara
Summary: Dirhodium complexes with bulky carboxylate ligands were synthesized and characterized. The steric bulk of carboxylate ligands has an impact on the selectivity in Rh-catalyzed intramolecular reactions: Rh catalysts with bulky carboxylate ligands preferentially produced five-membered ring products via insertion into a carbon-hydrogen bond, while conventional Rh catalysts obtained six-membered ring products via insertion of a carbon-carbon double bond.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Maxim L. Kuznetsov, Armando J. L. Pombeiro
Summary: The study investigates a new mechanism for the ecological oxidation of cyclohexane into adipic acid, using iron(II) complex as a catalyst under room temperature and radiation-free conditions. The catalyst significantly improves the conversion rate and selectivity towards adipic acid, opening up a new synthetic route and reducing the accumulation of intermediates.
JOURNAL OF CATALYSIS
(2021)
Review
Biochemistry & Molecular Biology
Manuel A. Valdes-Madrigal, Fernando Montejo-Alvaro, Amelia S. Cernas-Ruiz, Hugo Rojas-Chavez, Ramon Roman-Doval, Heriberto Cruz-Martinez, Dora I. Medina
Summary: Nitrogen oxides (NOx) are significant atmospheric pollutants, and carbon nanotubes (CNTs) are commonly used as NOx sensors due to their outstanding properties. Strategies such as surface functionalization and defect engineering have been developed to improve the NOx sensing capabilities of CNTs, leading to substantial enhancements in their sensitivity. Through various modifications, the sensitivity and selectivity of CNTs towards NOx gases have been significantly improved in the last decade.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Sofia Capelli, Ilaria Barlocco, Federico Maria Scesa, Xiaohui Huang, Di Wang, Francesca Tessore, Alberto Villa, Alessandro Di Michele, Carlo Pirola
Summary: The hydrogenation of muconic acid to bio-adipic acid can be efficiently catalyzed by Pd-Au bimetallic catalysts, which show higher activity and stability compared to monometallic catalysts. The selectivity can be tuned by changing the Pd/Au molar ratio, with higher gold content leading to higher selectivity towards intermediates.
Article
Biochemistry & Molecular Biology
Xiaoguo Zhang, Zhihong Chen, Zhaoneng Wan, Chali Liu, Renze He, Xiaoguang Xie, Zhangjie Huang
Summary: In this paper, a novel thiadiazole-based chloromethyl polystyrene-modified adsorbent (PS-DMTD) was synthesized and used for the selective adsorption of palladium from metallurgical wastewater, demonstrating its potential application in the recovery of Pd (II).
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Jamelah S. Al-Otaibi, Y. Sheena Mary, Y. Shyma Mary, Goncagul Serdaroglu
Summary: The study investigated the interaction mechanism of adipic acid (ADPA) on nanocages, and analyzed various properties to enhance the detection of drugs in other products. The study focuses on the adsorption and detection of the drug using nanocages, highlighting the potential of nanotechnology in drug delivery and detection.
JOURNAL OF MOLECULAR MODELING
(2021)
Article
Chemistry, Multidisciplinary
Rajesh Kancherla, Krishnamoorthy Muralirajan, Sayan Dutta, Kuntal Pal, Bo Li, Bholanath Maity, Luigi Cavallo, Magnus Rueping
Summary: The development of metal complexes that can function as both photocatalysts and cross-coupling catalysts is challenging. This study reports that divalent palladium can act as a light-absorbing species to achieve carbon-nitrogen cross-coupling reactions under air. Palladium acetate can be used as both the photocatalyst and cross-coupling catalyst for the selective cross-coupling amination of differently substituted aryl halides at room temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Marina A. Tokareva, Indrek Pernik, William Lewis, Barbara A. Messerle, Tatiana Glukhareva, Sinead T. Keaveney
Summary: In this study, ligand-controlled rhodium(I)-catalyzed denitrogenative transformations of different types of 4-vinyl-1,2,3-thiadiazoles were demonstrated. With [Rh(COD)(2)]BF4, vinylic 1,2,3-thiadiazoles undergo intramolecular transannulation reaction to afford substituted furans. However, with [Rh(COD)DPPF]BF4, intermolecular transannulation reaction occurs, providing access to highly functionalized thiophenes.
Article
Chemistry, Multidisciplinary
Lingling Liu, Hongli Wu, Genping Huang
Summary: Density functional theory calculations were used to investigate the nickel-catalyzed [3 + 2] cycloaddition reaction, revealing four major steps in the catalytic cycle. The enantioselectivity is mainly determined by the interaction between different groups, while the chemoselectivity can be rationalized in terms of steric effects.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xinzhi Li, Xiangwei Ren, Hongli Wu, Wentao Zhao, Xiangyang Tang, Genping Huang
Summary: Density functional theory calculations revealed the mechanism of regio- and enantioselectivity in the copper-catalyzed borocyanation reaction. The electron-withdrawing aryl group at the C-1 atom makes the C-4 atom more electrophilic, leading to the experimentally observed exclusive 4,3-regioselectivity. The enantioselectivity is attributed to steric effects and pi-pi stacking interactions between the butadiene moiety and the ligand.
CHINESE CHEMICAL LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Alessandra Garau, Giacomo Picci, Massimiliano Arca, Alexander J. Blake, Claudia Caltagirone, Greta De Filippo, Francesco Demartin, Francesco Isaia, Vito Lippolis, Anna Pintus, M. Andrea Scorciapino, M. Carla Aragoni
Summary: This study investigates the coordination chemistry of tetradentate pyridine-containing macrocycles towards Platinum Group metal ions Pd-II, Pt-II, and Rh-III, showing the structural characterization of the resulting complexes and the unique coordination environments of the ligands in different metal complexes. The study also utilizes Density Functional Theory calculations to determine the ground-state nature of a specific dinuclear Pt-II compound, providing insights into its electronic structure.
Article
Chemistry, Inorganic & Nuclear
Kan Wu, Bimal Pudasaini, Ji Young Park, Siden Top, Gerard Jaouen, Mu-Hyun Baik, William E. Geiger
Article
Chemistry, Physical
Dillon W. P. Tay, James D. Nobbs, Charles Romain, Andrew J. P. White, Srinivasulu Aitipamula, Martin van Meurs, George J. P. Britovsek
Article
Chemistry, Multidisciplinary
Mehrafshan G. Jafari, Yerin Park, Bimal Pudasaini, Takashi Kurogi, Patrick J. Carroll, David M. Kaphan, Jeremy Kropf, Massimiliano Delferro, Mu-Hyun Baik, Daniel J. Mindiola
Summary: This study presents the synthesis of a novel vanadium complex, investigating its electronic ground state using computational and experimental methods. The research reveals the mechanism of P-atom transfer and the nature of the low-valent vanadium ion in the complexes 2 and 4.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Nuwan Pannilawithana, Bimal Pudasaini, Mu-Hyun Baik, Chae S. Yi
Summary: The cationic Ru-H complex was found to be an effective catalyst for the dehydrative C-H coupling reaction, resulting in the formation of 2-alkylphenol, 1,1-disubstituted benzofurans, and xanthene derivatives. Experimental results showed normal deuterium isotope effect and carbon isotope effect, while DFT calculations provided insights into the reaction mechanism.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Dillon W. P. Tay, James D. Nobbs, Srinivasulu Aitipamula, George J. P. Britovsek, Martin van Meurs
Summary: Phenylene-bridged diphobane ligands with different substituents have been synthesized and studied in palladium-catalyzed carbonylation reactions of various alkenes. The results show different selectivities between hydroformylation and alkoxycarbonylation, with the performance also influenced by the nature and amount of acid cocatalyst.
Article
Engineering, Chemical
Boonying Tay, Martin van Meurs, Jozel Tan, Suming Ye, Armando Borgna, Alexander M. van Herk, Selvasothi Selvaratnam, Cun Wang, Shohei Taniguchi, Yousuke Suzuki, Masaru Utsunomiya, Mitsunobu Ito, Toshiki Monden, Hiroki Shibata, Shohei Tomita
Summary: The study demonstrates that using an imidazolium-type catalyst in melt-phase polymerization can reduce the branching in polycarbonates, especially by introducing substitutions at particular positions in the imidazolium structure. The best catalyst identified shows shorter polymerization time, lower branching levels, and lower yellowness index in the polycarbonate product.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Inorganic & Nuclear
Choon Heng Low, Joshua A. Buss, Theodor Agapie
Summary: The synthesis and characterization of a series of naphthalenediyl-diphosphine molybdenum complexes are reported. A novel dicarbonyl-Mo complex converts to a bis(siloxy)acetylene complex upon reduction and treatment with a silylelectrophile, showing exclusive C-C coupling distinct from previously reported analogues. Under mild conditions, further CO catenation can be achieved, leading to the formation of a metallacyclobutenone complex with a C3O3organic motif derived from CO.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Pavel Zatsepin, Jun-Hyeong Kim, Michael R. Gau, Patrick J. Carroll, Bimal Pudasaini, Mu-Hyun Baik, Daniel J. Mindiola
Summary: Highly modular and rational syntheses of titanium compounds with various telluride motifs have been achieved in this study. The structures and properties of these compounds have been characterized through crystallography, spectroscopy, and theoretical studies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Keen Hoe Ho, Martin van Meurs, Xuehong Lu, Soo Khim Lau
Summary: In this study, the addition of a low-cost Janus molecule called HOS to HMS-PP successfully enhanced the expansion ratio and compressive strength of macrocellular PP foams. HOS acted as a surfactant during the extrusion foaming process, stabilizing cell growth and reinforcing the cell surface. Furthermore, HOS slightly improved the viscosity and melt strength of PP and reduced its shear viscosity as a lubricant. This approach provides a simple and economically viable materials design guideline for alleviating the trade-off between expansion ratio and compressive strength in macrocellular polymer foams.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
James D. Nobbs, Sigit Sugiarto, Xin Yi See, Choon Boon Cheong, Srinivasulu Aitipamula, Ludger P. Stubbs, Martin van Meurs
Summary: Secondary phosphines are important building blocks in organic chemistry, and a practical synthesis of the bulky secondary phosphine synthon 2,2,6,6-tetramethylphosphinane (TMPhos) is reported. TMPhos, a close structural relative of di-tert-butylphosphine, can be obtained on a multigram scale from an inexpensive precursor, ammonium hypophosphite. The synthesis and isolation of TMPhos and its potential applications in ligand construction are described.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
James D. Nobbs, Dillon Wei Peng Tay, Yoon Hui Yeap, Yong Lun Tiong, Suming Ye, Srinivasulu Aitipamula, Cun Wang, Choon Boon Cheong, Martin van Meurs
Summary: Dioxaphosphabicyclo[2.2.2]octanes were synthesized in a one-pot reaction and showed excellent performance and activity as ligands in catalytic reactions.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Ho Ryu, Bimal Pudasaini, Dasol Cho, Sungwoo Hong, Mu-Hyun Baik
Summary: A typical synthetic protocol for preparing 7-azaindoles involves using a Rh(iii)-catalyst with the assistance of an external Ag+ oxidant. DFT simulations show that Ag+ can oxidize neutral Rh(iii) intermediates and accelerate the reaction steps, thus promoting the synthesis of 7-azaindoles.