Article
Chemistry, Multidisciplinary
Nobuki Kishi, Yuki Adachi, Rui Jiang, Takahiro Doi, Da-Yang Zhou, Kaori Asano, Yasushi Obora, Takayoshi Suzuki, Hiroaki Sasai, Takeyuki Suzuki
Summary: The study describes the first successful example of a catalytic enantioselective intramolecular Tishchenko reaction, leading to the formation of chiral lactones in good yields with up to 91% ee. These enantioenriched lactones were then used for the first synthesis of (S)-cedarmycins A and B.
Article
Chemistry, Inorganic & Nuclear
Raill R. Quinonez-Lopez, Sara A. Cortes-Llamas, J. Roberto Estrada-Flores, Jose G. Alvarado- Rodriguez, Oscar Blanco-Alonso, A. Aaron Peregrina-Lucano, Elvia Becerra-Martinez, I. Idalia Rangel-Salas
Summary: Heteroleptic [RhIIICp*(NHC)] and [IrIIICp*(NHC)] complexes with a N-amino acid functionality derived from imidazolium salts were synthesized and characterized. The structure of [RhCp*{kappa 2(C,O)-NHC}Cl] complex 3f was discussed as a pair of diastereomers. The catalysts showed good yields for the transfer hydrogenation of ketones in basic propan-2-ol, and a chromatographic method for measuring compounds in the reaction was validated. These Rh and Ir complexes provide a new approach in developing catalysts based on classical NHC precursors.
Article
Chemistry, Multidisciplinary
Binbin Xu, Wei Mao, Chengcheng Wu, Jinhua Li, Zhengyu Lu, Ming Luo, Liu Leo Liu, Lingling Mao, Dafa Chen, Haiping Xia
Summary: In this study, a one-pot strategy was developed to prepare non-beta-phosphonium functionalized rhoda- and irida-carbolong complexes from an organic multiyne. This strategy allows for the introduction of various beta-substituents into the complexes using different nucleophiles, providing a convenient route for the further development of carbolong chemistry.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Pharmacology & Pharmacy
Ana R. Rubio, Rocio Gonzalez, Natalia Busto, Monica Vaquero, Ana L. Iglesias, Felix A. Jalon, Gustavo Espino, Ana M. Rodriguez, Begona Garcia, Blanca R. Manzano
Summary: In the field of anticancer chemotherapy, a study has been conducted to synthesize metal complexes with bioactive ligands to overcome drug resistance. The results show that one of the complexes has high cytotoxicity, induces apoptosis, overcomes drug resistance, and displays selectivity towards cancer cells through DNA binding and ROS generation pathways.
Article
Chemistry, Multidisciplinary
Minjin Yoo, Michael J. Krische
Summary: This research synthesized the potent spliceosome modulator pladienolide B with 10 stereogenic centers in 10 steps. Asymmetric alcohol-mediated carbonyl crotylations catalyzed by ruthenium and iridium were used to form the C20-C21 and C10-C11 C-C bonds with syn- and anti-diastereoselectivity, respectively.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Inorganic & Nuclear
Kelvin K. H. Tong, Mie Riisom, Euphemia Leung, Muhammad Hanif, Tilo Sohnel, Stephen M. F. Jamieson, Christian G. Hartinger
Summary: In this study, organometallic complexes with a piano-stool structure and di- or tridentate ligand systems were reported, showing improved biological activity and impact on cytotoxic activity.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Li-Jun Zhao, Zequn Yin, Yusheng Shi, Wen Sun, Libo Sun, Huijuan Su, Xun Sun, Weiling Zhang, Linyan Xia, Caixia Qi
Summary: A highly active iridium complex was obtained with an anionic ligand, showing robust cofactor NADH regeneration in physiological conditions. The high activity of the complex can promote enzymatic reactions.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Cole C. Meyer, Nicholas P. Stafford, Melinda J. Cheng, Michael J. Krische
Summary: Ethanol, with an annual production exceeding 85 million tons, has been demonstrated for the first time as a C-2 feedstock in catalytic enantioselective C-C couplings. This study focuses on reactions with structurally complex, nitrogen-rich allylic acetates incorporating top N-heterocycles found in FDA-approved drugs. Ethanol shows potential applications in enantioselective C-C coupling, especially in the field of pharmaceutical synthesis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Daniel Becker, Dirk Bockfeld, Matthias Tamm
Summary: In this study, two complexes were obtained by reacting the bidentate [P,N] ligand with [Ir(COD)Cl] and adding different ligands, and further reaction yielded a diiridium tetrahydride. Crystal structure analysis of the three complexes revealed that the position of the hydrogen atoms in one of the complexes could be refined freely. Since the first complex is a validated catalyst, the performance of the two complexes in deuterium labeling reactions was compared.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Chen Sun, Victoria F. Oswald, Ethan A. Hill, Joseph W. Ziller, A. S. Borovik
Summary: The use of a tripodal ligand containing specific coordination groups allows for the synthesis of iron complexes, and examination of their structures and properties in the crystalline phase. Variations in the primary and secondary coordination spheres can impact the electrochemical properties of metal complexes, leading to different redox reactions.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Yongxian Li, Jia-Yi Chen, Qiyi Miao, Xin Yu, Lei Feng, Rong-Zhen Liao, Shengfa Ye, Chen-Ho Tung, Wenguang Wang
Summary: Parent amido complexes play a crucial role in ammonia-based transformations. The study introduces a well-defined ferric ammine system that efficiently catalyzes electrochemical ammonia oxidation. A formal Fe(IV)-amido species, along with its conjugated Lewis acid, is isolated and characterized for the first time. Mechanism studies reveal the formation of hydrazine through the non-innocent nature of the phenylamido ligand.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Sara Fernandez-Moyano, Marconi N. Penas-Defrutos, Camino Bartolome, Pablo Espinet
Summary: Analysis of bonding contributions in transition metal complexes [(MCp)-Cp-III*(L)XY] (M = Rh, Ir; Cp* = C5Me5; L = CO, CN-, CNR) revealed a variety of new interactions, including direct lateral donations and hybrid donations, accounting for approximately 20% of the electron donation to the pi*(CO) orbitals.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Felix Bauer, Niklas Dierenbach, Bernhard Breit
Summary: Here, an improved self-assembling phosphorus ligand based on hydrogen bonding between pyridone/hydroxypyridine in the ligand backbone is reported. The N-pyrrolyl substituents significantly enhance the pi-backbonding properties of the ligand. Rhodium, iridium, and platinum complexes of the ligand were synthesized and characterized using NMR spectroscopy and x-ray crystal structure analysis. The ligand-based catalyst exhibited high catalytic activity and linear regioselectivity in rhodium-catalyzed hydroformylation of 1-octene, as well as in linear regioselective iridium-catalyzed hydroformylation of 1-octene.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Kouki Tsuge, Shunnichi Kubota, Kana Sakamoto, Kenji Kitayama, Takahiro Nishimura
Summary: This study demonstrated the successful iridium-catalyzed alpha-alkylation of methyl ketones with primary carbohydrate alcohols using the borrowing hydrogen strategy. Protected sugar derivatives with one free primary hydroxyl group reacted with methyl ketones, resulting in the formation of alpha-alkylation products or alkylated 4,5-unsaturated sugars, accompanied by the elimination of an alkoxy group.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Biochemistry & Molecular Biology
Krystal M. Cid-Seara, Raquel Pereira-Cameselle, Sandra Bolano, Maria Talavera
Summary: This study focuses on the synthesis and characterization of new organometallic complexes based on 9,9'-spirobifluorene and their reactions with amines, revealing selective reactivity depending on the nature of the amine and the metal center.
Article
Polymer Science
Miloud Bouyahyi, Lidia Jasinska-Walc, Rob Duchateau, Muhammad Naseem Akhtar, E. A. Jaseer, Rajesh Theravalappil, Nestor Garcia
Summary: In this study, the performance of different catalyst structures in polypropylene reactions was compared. It was found that zirconocenes and hafnocenes with substituted indenyl ligands had higher molecular weight capability, improved stereo-selectivity, and enhanced ability to incorporate functionalized comonomers. Additionally, a linear inversely proportional correlation between polymerization temperature and functionalized comonomer reactivity, copolymer molecular weight, and melting temperature was observed. Furthermore, the immobilization of the best performing catalyst onto silica failed to incorporate any functionalized comonomer.
Article
Chemistry, Inorganic & Nuclear
Pablo Hermosilla, Pilar Garcia-Orduna, Pablo J. Sanz Miguel, Victor Polo, Miguel A. Casado
Summary: The reaction of an amido pincer complex with carbon dioxide resulted in a neutral complex, which then underwent a coupling reaction with primary amines to form cationic complexes. The study revealed a novel reactivity trend in alkyne activation, showing a metal-ligand cooperative mechanism involving electrophilic attack and proton rearrangement.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Carlos Ferrer, Joaquina Ferrer, Vincenzo Passarelli, Fernando J. Lahoz, Pilar Garcia-Orduna, Daniel Carmona
Summary: This study reports the synthesis, characterization, and reactivity of dinuclear rhodium and iridium complexes based on N-pyridin-2-ylmethyl-N',N ''-bis-(2,6-diisopropylphenyl) guanidine (H2L) as a ligand. The complexes were found to activate the H-H and O-H bonds of dihydrogen and water, suggesting their potential application as catalysts or functional materials. The results provide important experimental evidence for exploring new catalysts and preparing functional materials.
Article
Chemistry, Inorganic & Nuclear
Maria Carmona, Roberto Perez, Joaquina Ferrer, Ricardo Rodriguez, Vincenzo Passarelli, Fernando J. Lahoz, Pilar Garcia-Orduna, Daniel Carmona
Summary: This article investigates the reactions between [(Cp*MCl)(2)(mu-Cl)(2)] and Ph2PCH2CH2NC(NH(p-Tolyl))(2) under different conditions, leading to the synthesis of a series of metal complexes. The structures and reaction mechanisms of these complexes were characterized and studied.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Alejandra Gomez-Espana, Pilar Garcia-Orduna, Jefferson Guzman, Israel Fernandez, Francisco J. Fernandez-Alvarez
Summary: The study demonstrates the formation of [IrH(Cl)(κ2-NSitBu2)(L)] species through the reaction of [IrH(Cl)(κ2-NSitBu2)(coe)] with PCy3 or PHtBu2. The structures and properties of these complexes are characterized by NMR spectroscopy and X-ray diffraction studies.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
M. Pilar del Rio, B. Eva Villarroya, Jose A. Lopez, Ana M. M. Geer, Fernando J. J. Lahoz, Miguel A. A. Ciriano, Cristina Tejel
Summary: This study describes the synthesis of neutral and dicationic tetrametallic iridium chains connected by an iridium-iridium bond. The complexes exhibit fractional averaged oxidation states and electronic delocalization along the metallic chain. The absorption spectra of the complexes show characteristic bands that can be fine-tuned by varying the terminal capping ligands.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
E. A. Jaseer, Nestor Garcia, Samir Barman, Mohamed Elanany, Motaz Khawaji, Hassan Alasiri, Niladri Maity
Summary: Phosphinite based ligands were evaluated for the first time in chromium catalyzed ethylene oligomerization, promoting the production of olefin products with a carbon number ranging from C6-C14. The highest productivity achieved was 12517 g/gCr.h.
Article
Chemistry, Multidisciplinary
Samir Barman, Nestor Garcia, E. A. Jaseer, Mohamed Elanany, Motaz Khawaji, Hassan Alasiri, Abdul Malik P. Peedikakkal, Muhammad Naseem Akhtar, Rajesh Theravalappil
Summary: Novel N-aryl-functionalized PNP ligands were prepared and evaluated for chromium-catalyzed ethylene oligomerization. The Cr/PNP system showed high 1-octene-selective ethylene tetramerization and restricted polyethylene selectivity. The N-aryl PNP ligands with m-alkyloxy substituents exhibited better performance than those with m-silyloxy substituents in terms of tetramerization and polyethylene fraction.
Article
Chemistry, Inorganic & Nuclear
Ana Luque-Gomez, Pilar Garcia-Orduna, Fernando J. Lahoz, Manuel Iglesias
Summary: A new method for preparing Co(I)-NHC complexes has been developed, which involves the direct reaction of imidazolium salts with Co(0) complex. The obtained complexes have shown efficient catalytic activity in the reductive amination of furfural and levulinic acid, using silanes as reducing agents. The side reaction of hydrosilylation process, dehydrocoupling of the silane, has also been observed.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Sophie Beard, Alejandro Grasa, Fernando Viguri, Ricardo Rodriguez, Jose A. Lopez, Fernando J. Lahoz, Pilar Garcia-Orduna, Pilar Lamata, Daniel Carmona
Summary: This article presents transition metal frustrated Lewis pair compounds and their activation of bonds in small molecules, discussing their mechanisms and catalytic properties.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Samir Barman, E. A. Jaseer, Nestor Garcia, Mohamed Elanany, Motaz Khawaji, Wei Xu, Sibo Lin, Hassan Alasiri, Muhammad Naseem Akhtar, Rajesh Theravalappil
Summary: Novel PNP ligands with N-triptycene backbone were developed for selective ethylene oligomerization. The pre-catalyst containing Cr(acac)(3)/ligand efficiently promoted ethylene tetramerization with high productivities and C-8 olefin selectivities. Ligands with PNP moiety achieved exceptionally high alpha selectivities due to high 1-C-6 purity in the C-6 fraction. Rational design of PNP ligands with optimum steric profile around the N-center provided highly alpha-selective ethylene oligomerization.
CHEMICAL COMMUNICATIONS
(2022)