Review
Chemistry, Multidisciplinary
Robin N. Perutz, Sylviane Sabo-Etienne, Andrew S. Weller
Summary: This article introduces the concept of sigma-CAM and a new approach to reaction mechanisms. It focuses on the characteristics and dynamic rearrangements of sigma-bond complexes, providing examples of the sigma-CAM mechanism supported by experimental and computational evidence. The authors also critically compare alternative mechanisms for metathesis of metal-element bonds.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Pablo D. Nieres, Victoria A. Vaillard, Juan Zelin, Nicolas I. Neuman, Andres F. Trasarti, Carlos R. Apesteguia, Santiago E. Vaillard
Summary: HG(2) is a reliable and extremely useful catalyst for synthesizing olefins, especially for the self-metathesis reaction of unsaturated fatty acid methyl esters. Silica gel is a promising support for large scale application of HG(2) due to its beneficial characteristics. However, storing the supported catalyst under atmospheric conditions at 298K significantly decreases its activity, which compromises its stability and applicability. Detailed experimental and spectroscopic studies, along with electronic structure calculations, shed light on the catalyst decomposition process.
Article
Chemistry, Inorganic & Nuclear
Marthinus R. Swart, Linette Twigge, Elizabeth Erasmus, Charlene Marais, Barend C. B. Bezuidenhoudt
Summary: The use of p-cresol as an additive in the Grubbs second generation catalyst facilitates the cross-metathesis of acrylates with prop-1-en-1-ylbenzenes. The interaction between p-cresol and GII leads to the formation of a ruthenium benzylidene with hydrogen bonds, altering the electron densities on the metal center and the carbene.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Marthinus Rudi Swart, Charlene Marais, Elizabeth Erasmus
Summary: The metathesis reaction between 1-hexene and (E)-anethole in the presence of Grubbs 2nd generation catalyst was monitored using in situ H-1 NMR spectroscopy at different temperatures and anethole mol fractions. The highest concentration of the cross-metathesis product was found to be more dependent on the anethole mol fraction rather than the temperature, with a preliminary kinetic study suggesting the secondary metathesis reaction follows first order kinetics.
Article
Chemistry, Multidisciplinary
Steven T. Diver, Elise Glickert, Laurence N. Rohde, Therese Wild
Summary: In this study, a variety of 1-aryl-1,3-dienes were converted from E to Z isomers through photocatalysis using Ru(bpy)(3)[PF6](2) and blue LED light. The enrichment of Z-isomers was achieved by selective triplet energy transfer from the photocatalyst. By combining catalytic ene-yne metathesis (EYM) and photocatalysis, a stereoconvergent synthesis of Z-1,3-dienes was achieved.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Raphael J. Zachmann, Alois Fuerstner
Summary: The newly discovered light-driven gem hydrogenation of alkynes provides a safe and versatile approach to synthesizing Grubbs-type ruthenium carbene complexes, using a triple bond as the carbene source without needing sacrificial phosphines.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Review
Biochemistry & Molecular Biology
Paola Peluso, Victor Mamane
Summary: This review provides a comprehensive overview of the current advancements in the use of sigma-hole interactions in stereoselective processes, including the formation of chiral supramolecular assemblies, separation of enantiomers, enantioselective complexation, and asymmetric catalysis.
Article
Chemistry, Multidisciplinary
Miguel A. Esteruelas, Ana M. Lopez, Enrique Onate, Esther Raga
Summary: This study investigates the silylation mechanism of OsH6((PPr3)-Pr-i)(2) phosphine ligand via net-metathesis reactions, where the silyl group is replaced by a methyl group. The results reveal selective displacement of the silyl substituent, providing insights into the activation and selectivity of the Si-H bond.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Henry L. Cater, Iana Balynska, Marshall J. Allen, Benny D. Freeman, Zachariah A. Page
Summary: This paper presents a systematic study on ROMP with endo-norbornene monomers using stable chelated Ru-alkylidene initiators. The study shows that ROMP with endo-norbornene monomers is versatile and robust, providing access to polymers with excellent molecular weight control, low dispersities, good functional group tolerance, and high chain-end fidelity. The process is oxygen-tolerant and can be performed under ambient conditions, allowing for the synthesis of mechanically robust thermoplastics with high glass transition and decomposition temperatures.
Article
Chemistry, Applied
R. Cuevas-Garcia, J. G. Tellez-Romero, J. Ramirez, P. Sarabia-Banuelos, I. Puente-Lee, C. Salcedo-Luna, S. Hernandez-Gonzalez, V. A. Nolasco-Arizmendi
Summary: The three nickel catalysts supported on mordenite zeolite with the same nickel content of 2 wt.% were prepared using different methods and showed diverse selectivity and activity in naphthalene hydrogenation reactions, with the Ni-DP catalyst displaying the highest hydrogenation activity and relatively slow deactivation rate.
Article
Energy & Fuels
Momo Yamane, Yuto Seo, Wahyu S. Putro, Miftah Faried, Vladimir Ya. Lee, Tomoteru Mizusaki, Yukio Takagi, Kazuhiro Matsumoto, Jun-Chul Choi, Norihisa Fukaya
Summary: A new ruthenium carbene complex 1 was synthesized and characterized, in which the 1Pr ligand was modified via the introduction of Me3Si-group at the 4-position of the NHC backbone. This second-generation Grubbs pre-catalyst 1 exhibited excellent catalytic activity in the ring-closing metathesis of diethyldiallylmalonate, showing significantly higher activity compared to the commercially available first-generation Grubbs pre-catalyst [C12(Cy3P)2Ru=CHPh] and comparable activity to the second-generation Grubbs pre-catalyst [C12(Cy3P)(1Pr)Ru=CHPh].
JOURNAL OF THE JAPAN PETROLEUM INSTITUTE
(2023)
Article
Chemistry, Physical
Kevin Basemann, Bradley M. Schmidt, Aaron D. Sadow
Summary: The study of reaction conditions for ruthenium-catalyzed ene-yne metathesis has shown that substituents and functional groups on the terminal alkyne reactant play a significant role in affecting the outcomes. Utilizing different methods and optimized conditions can lead to high turnovers and yields. Various research approaches and reaction conditions can improve the efficiency and conversion rates of the reactions.
Article
Chemistry, Multidisciplinary
Xin Zhang, Liu Leo Liu
Summary: In this study, a novel free N-aluminylene, carbazolylaluminylene 2b, was synthesized and characterized. The coordination behavior of 2b towards transition metal centers was investigated, revealing diverse coordination modes and the ability to modulate electronic properties without changing coordinated atoms. Furthermore, an unprecedented aluminylene-alumanyl transformation was observed, leading to the formation of a rare terminal Cu-alumanyl complex 8. The electronic structures of these complexes and the mechanism of transformation were studied through density functional theory calculations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Biochemistry & Molecular Biology
Slawomir J. Grabowski
Summary: CCSD(T)/aug-cc-pVTZ//omega B97XD/aug-cc-pVTZ calculations were performed for halogen-bonded complexes involving Lewis base units such as molecular hydrogen and cycloalkanes, and Lewis acid units like FCCH and molecular halogens. Analysis of these complexes using QTAIM, NBO and EDA approaches revealed distinct properties influenced by the type of electron donor.
Article
Chemistry, Inorganic & Nuclear
Sayantani Saha, Boris Averkiev, Peter E. Sues
Summary: In this study, a new ruthenium catalyst was synthesized for the homocoupling of terminal alkenes. Experimental results showed that this catalyst exhibited high reaction rate and good stability. Theoretical calculations revealed two potential catalytic mechanisms. The substrate scope study demonstrated that the catalyst was more sensitive to electron-deficient alkenes and steric bulk on the substrate.
Article
Chemistry, Physical
Velayudhan V. Divya, Fareed Bhasha Sayyed, Cherumuttathu H. Suresh
Article
Chemistry, Physical
Puthannur K. Anjalikrishna, Cherumuttathu H. Suresh, Shridhar R. Gadre
JOURNAL OF PHYSICAL CHEMISTRY A
(2019)
Article
Chemistry, Physical
Padinjare Veetil Bijina, Cherumuttathu H. Suresh
JOURNAL OF PHYSICAL CHEMISTRY A
(2020)
Article
Chemistry, Organic
R. S. Reyno, Akash Sugunan, S. Ranganayakulu, Cherumuttathu H. Suresh, Goreti Rajendar
Article
Chemistry, Multidisciplinary
Anandavally Asha, Jaice Ravindran, Subhadra Suma, Cherumuttathu H. Suresh, Ravi S. Lankalapalli
Article
Chemistry, Physical
Geetha S. Remya, Cherumuttathu H. Suresh
Article
Chemistry, Multidisciplinary
Bai A. Anjali, Cherumuttathu H. Suresh
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2020)
Article
Chemistry, Organic
Thondikkal Sulfikarali, Jayaprakash Ajay, Cherumuttathu H. Suresh, Padinjare Bijina, Sabapathi Gokulnath
JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
P. R. Nitha, V. Jayadev, Sourava C. Pradhan, Velayudhan V. Divya, Cherumuttathu H. Suresh, Jubi John, Suraj Soman, Ayyappanpillai Ajayaghosh
CHEMISTRY-AN ASIAN JOURNAL
(2020)
Article
Chemistry, Organic
Anju K. Sasidharan, Jomon Mathew, Ammathnadu S. Achalkumar, Manoj Mathews
Summary: This study focuses on the synthesis and liquid crystalline properties of low molecular weight bis-chalcone compounds derived from acetone, cyclopentanone, and cyclohexanone cores. The results show that compounds with octyloxy chains at the para position on either side of the dibenzylidine ring exhibit liquid crystalline behavior, while acetone-based compounds do not. The structure-liquid crystalline property relationship is explained through structural analysis and calculations. A preliminary study on the fluorescence property of a selected compound is also conducted.
CURRENT ORGANIC SYNTHESIS
(2022)
Article
Chemistry, Physical
Vindhya Hegde, C. O. Sreekala, Naveen V. Kulkarni, Dineshchakravarthy Senthurpandi, Jomon Mathew
Summary: A series of cobalt(II) complexes with diverse structural and electronic properties were prepared and thoroughly characterized. Among them, the C4 complex exhibited the highest power conversion efficiency.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Multidisciplinary
Amrutha Kizhuvedath, Jose John Mallikasseri, Jomon Mathew
Summary: Computational analysis was conducted to investigate the electronic effect of substituents on the reactivity of silenes. Three types of reactions, including dimerization, small molecule activation, and isomerization, were analyzed using different types of silenes with various substituents. The position of the substituent was found to be crucial in determining the C-Si bond polarity and the reactivity of silenes. The presence of pi-donating substituents stabilized the free energy profile and facilitated the reactions. These findings highlight the importance of fine-tuning the electronic effects of substituents to control the chemical reactivity of silenes.
STRUCTURAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Vindhya Hegde, C. O. Sreekala, Naveen V. Kulkarni, Jomon Mathew
Summary: A series of eight cobalt(II) pincer complexes were prepared using NNN tridentate and NN bidentate pincer ligand systems. Spectroscopic techniques and X-ray analysis were used to characterize the ligands and complexes. Computational and electrochemical methods were employed to study the molecular structures and energy gaps of the compounds. The cobalt (II) complexes were tested as dyes in dye-sensitized solar cells, and the complex C7 with a bis(benzimidazole) system and an ethylene backbone showed the highest power conversion efficiency.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Velayudhan V. Divya, Cherumuttathu H. Suresh
NEW JOURNAL OF CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Mainak Das, Sangya Chitranshi, M. Murugavel, B. Adinarayana, Cherumuttathu H. Suresh, A. Srinivasan
CHEMICAL COMMUNICATIONS
(2020)