Article
Astronomy & Astrophysics
David Jorrin, Martin Schvellinger
Summary: This study investigates the symmetric and antisymmetric structure functions in electromagnetic deep inelastic scattering using a holographic dual description. The Brower-Polchinski-Strassler-Tan Pomeron and type IIB superstring theory scattering amplitudes, as well as type IIB supergravity on AdS5 x S5, are considered. The study focuses on different kinematic regions of the Bjorken variable x and squared momentum of the virtual photon Q2 for proton structure functions FP2 and gP1. The analysis also includes the investigation of the virtual Compton scattering asymmetry AP1 of the proton. The predictions from the holographic Pomeron for small x values are compared with experimental data.
Article
Chemistry, Organic
Pritam Roy, Anugam V. Krishna, Dhevalapally B. Ramachary
Summary: Biologically important 4-alkylsyncarpic acids were synthesized through a one-pot organocatalytic reaction, and their synthetic applications were demonstrated. Formal total synthesis of important derivatives was achieved starting from 4-alkylsyncarpic acids. The importance of C-alkylated products was further showcased.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Mirai Komabayashi, Shoma Okushiba, Toshiki Nokami, Stefan Jopp
Summary: This research article focuses on the synthesis of ionic liquids from glucosamine, a renewable material obtained from chitin. The researchers overcame obstacles in the synthesis by using Borch reductive amination to achieve a different amino-group, and discovered new shortened reaction procedures and expanded the library of ionic liquids. The thermal properties of the products were compared to understand structure-property relationships.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Kemiao Hong, Yi Zhou, Haoxuan Yuan, Zhijing Zhang, Jingjing Huang, Shanliang Dong, Wenhao Hu, Zhi-Xiang Yu, Xinfang Xu
Summary: This study reports a Rh-catalyzed reaction for the direct synthesis of furan-fused cyclobutanone compounds. DFT calculations reveal the reaction mechanism and the importance of using less reactive catalysts for high selectivity. This method allows the synthesis of previously inaccessible and unknown versatile synthetic blocks, while exhibiting anticancer activity.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Roman O. Iakovenko, Daniel Chrenko, Jozef Kristek, Eline Desmedt, Frantisek Zalesak, Freija De Vleeschouwer, Jiri Pospisil
Summary: A new method for direct oxidative coupling of heteroaryl thiols and primary amines is reported. The readily available and inexpensive materials, mild reaction conditions, and good yields make it a useful tool for the synthesis of previously difficult to obtain sulfonamides.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2022)
Article
Chemistry, Physical
Tao Yang, Yan Song, Xiaodong Tian, Shijie Wu, Zhanjun Liu
Summary: The difference in composition of pitch plays a crucial role in determining the porosity of pitch-based activated carbons. Different fractions of porous carbons exhibit different reactivity, with the TS fraction typically showing better electrochemical performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Inorganic & Nuclear
Agnieszka Pladzyk, Daria Kowalkowska-Zedler, Anna Ciborska, Andreas Schnepf, Anna Dolega
Summary: The purposeful syntheses of silanethiolate complexes began in the mid-1980s, but a comprehensive summary had not been reported until now. This review highlights common features in the synthetic methods and resulting complexes, outlining specific difficulties during synthesis and presenting the structures, properties, and potential applications of the complexes involving various metals across the periodic table.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Organic
Sharada S. Labadie, Karine Thai, Jessica M. Grandner, Yanzhou Liu, Brendan T. Parr
Summary: This investigation demonstrates that enyne amides can smoothly undergo cyclization to form pyridones in the presence of a secondary amine, but fails with six-membered and larger ring systems. The ring closure reaction is catalytic, involving sequential 1,6-addition of the amine, 6-exo-trig ring closure of the iminium intermediate, and subsequent elimination of the secondary amine.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Review
Chemistry, Organic
Abhishek Pareek, Garima Singh, Srinivasarao Yaragorla
Summary: C-acylimines are compounds obtained through the reaction of glyoxals and amines, which exhibit similar structures to naturally occurring substances and have unique reactivity in the synthesis of nitrogen-containing cyclic compounds. Despite the lack of available reviews in this specific area, numerous synthetic methods have been developed.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Review
Materials Science, Multidisciplinary
Ning Li, Yuheng Lei, Ziyuan Song, Lichen Yin
Summary: Polypeptides obtained from N-carboxyanhydrides' ring-opening polymerization have attracted broad interests as synthetic analogues of natural proteins. They form ordered secondary structures like alpha-helices and 8-sheets, offering unique conformation-specific functions and potential biomedical applications.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Yu-Shan Zhang, Zhen Huan, Jin-Dong Yang, Jin-Pei Cheng
Summary: The unique heterocyclic skeletons of N-heterocyclic phosphines (NHPs) make them have excellent hydridic reactivity. Recently, their applications in radical reductions, particularly in a catalytic fashion, have become a promising cutting-edge area. This new reaction pattern, different but complementary to the traditional hydride pathway, can greatly expand the reaction scope.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Livia S. Meszaros, Henrik Land, Holly J. Redman, Gustav Berggren
Summary: Hydrogenases are crucial enzymes central in hydrogen metabolism, and the semi-synthetic approach has helped to elucidate their structure, function, biodiversity, and catalytic mechanisms. Additionally, investigating the assembly line of these enzymes using synthetic precursors provides detailed insight into their biosynthesis process.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Benjamin D. Katzman, Ryan R. Maar, Daniela Cappello, Madeleine O. Sattler, Paul D. Boyle, Viktor N. Staroverov, Joe B. Gilroy
Summary: Lewis acids are highly desirable for various applications, and when combined with pi-conjugated molecular frameworks, they can exhibit unique optoelectronic properties. In this study, a tridentate formazanate ligand was used to create a planar, redox-active, fluorescent, and strongly Lewis-acidic borenium cation, which was demonstrated to function as a colorimetric probe for reactivity.
CHEMICAL COMMUNICATIONS
(2021)
Review
Chemistry, Multidisciplinary
Ze Yang, Wang Gao
Summary: Alloys have great potential in heterogeneous catalysis due to their various catalytic active sites, and machine learning methods can help address the challenges in designing alloy catalysts. The key challenge lies in exploring suitable universal descriptors to accurately describe different types of alloy catalysts.
Review
Chemistry, Multidisciplinary
Resat Aksakal, Chiel Mertens, Matthieu Soete, Nezha Badi, Filip Du Prez
Summary: In the past decade, the field of sequence-defined polymers and related monodisperse synthetic macromolecules has seen exponential growth, evolving from synthetic route development to structure-property relationships and promising applications. Research on application-oriented discrete synthetic macromolecules has emerged, with fascinating studies in material science and life sciences showing potential for future trends.
Article
Chemistry, Multidisciplinary
Jingjing Zhang, Quan Chen, Robert J. Mayer, Jin-Dong Yang, Armin R. Ofial, Jin-Pei Cheng, Herbert Mayr
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Multidisciplinary
Aurelien Chardon, Arnaud Osi, Damien Mahaut, Thu-Hong Doan, Nikolay Tumanov, Johan Wouters, Luca Fusaro, Benoit Champagne, Guillaume Berionni
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Multidisciplinary
Zhen Li, Robert J. Mayer, Armin R. Ofial, Herbert Mayr
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Biographical-Item
Chemistry, Multidisciplinary
Bernd Giese, Herbert Mayr, Hans-Ulrich Reissig
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Multidisciplinary
Thu-Hong Doan, Aurelien Chardon, Arnaud Osi, Damien Mahaut, Nikolay Tumanov, Johan Wouters, Benoit Champagne, Guillaume Berionni
Summary: Three methods have been developed for synthesizing semi-planar triarylboranes with two aryl rings connected by a methylene bridge, allowing for fine-tuning of their stereoelectronic properties and Lewis acidities. These compounds are capable of forming complexes with small Lewis bases, but exhibit sufficient steric shielding to avoid interaction with larger Lewis bases. Additionally, a newly synthesized amino-borane with a long intramolecular B-N bond may serve as a potential candidate in Lewis pairs catalysis.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Organic
Mathieu Gama, Xavier Antognini Silva, Thu-Hong Doan, Arnaud Osi, Aurelien Chardon, Nikolay Tumanov, Johan Wouters, Guillaume Berionni
Summary: Two synthetic strategies were developed to synthesize triptycene-derived bulky boranes, boronates, and boron ate-complexes with various boron substituents. The study showed the quantitative information on the effect of the triptycene scaffold on the photophysical and electronic properties of the obtained compounds through single-crystal X-ray diffraction analysis and UV-Vis/photoluminescence measurements.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Arnaud Osi, Damien Mahaut, Nikolay Tumanov, Luca Fusaro, Johan Wouters, Benoit Champagne, Aurelien Chardon, Guillaume Berionni
Summary: This study reveals the rational design and remarkable reactivity of a geometrically constrained boron Lewis superacid. It demonstrates the formation of non-classical electron deficient B-H-B type of bonding and enables challenging chemical transformations through the taming of pyramidal Lewis acid electrophilicity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Manfred Hartnagel, Armin R. Ofial, Herbert Mayr
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Physical
Damien Mahaut, Benoit Champagne, Guillaume Berionni
Summary: In this study, frustrated Lewis pairs were used as catalysts for the hydrogenation of unactivated alkenes with H-2. Ortho-substituted 9-phosphatriptycene derivatives, with weak Lewis basicity and high steric hindrance, were found to be advantageous in catalyzing this reaction in combination with tris(pentafluorophenyl)borane. The protonation of the olefin by the strongly acidic phosphonium cation was identified as the critical step in the reaction.
Article
Chemistry, Physical
Damien Mahaut, Guillaume Berionni, Benoit Champagne
Summary: The accurate prediction of tertiary phosphines' basicity in acetonitrile and water is achieved by correlating computed Delta pK(a)'s obtained by density functional theory (DFT) with experimental values. This method is used to predict pK(a) values of 9-phosphatriptycene derivatives and reveals that they are weaker Bronsted bases compared to their triphenylphosphine analogues. Their lower reactivity is attributed to their high pyramidalization, resulting in increased 3s character of their lone pair, which stabilizes their energy level. Furthermore, their potential application in frustrated Lewis pair chemistry is explored through the investigation of the hydrogenation of 1,1-diphenyl-ethylene by the tris(pentafluorophenyl)borane/1-chloro-9-phos-phatriptycene frustrated Lewis pair.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Organic
Arnaud Osi, Nikolay Tumanov, Johan Wouters, Aurelien Chardon, Guillaume Berionni
Summary: A new boratriptycene derivative with a selenium atom in the bridgehead position of the triptycene scaffold was synthesized, and its Lewis acidity was evaluated experimentally and computationally. The introduction of a selenium atom allows precise modification of the pyramidalization of the boron atom environment, affecting the Lewis acidity parameters of the triarylborane.
SYNTHESIS-STUTTGART
(2023)
Editorial Material
Chemistry, Multidisciplinary
Guillaume Berionni
Summary: This article provides a brief overview of the latest developments in electrophilic C-H borylation reactions of arenes and heteroarenes without transition metals, with a particular focus on the recent advances in highly regioselective C-H borylations of indoles and indolines using borylation template reagents.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Arnaud Osi, Nikolay Tumanov, Luca Fusaro, Johan Wouters, Guillaume Berionni, Aurelien Chardon
Summary: Isolation and characterization of highly reactive intermediates are important for understanding chemical reactivity. The chemistry of borylated sulfate, triflimidate, and triflate anions were studied in order to synthesize unique analogs of protonated Bronsted superacids. Complexes formed by borylation with a 9-boratriptycene derived Lewis super acid and a weakly coordinated anion were characterized in solution and in the solid state, exhibiting unique structures and reactivities.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Arnaud Osi, Nicolas Niessen, Damien Mahaut, Benoit Champagne, Aurelien Chardon, Nikolay Tumanov, Johan Wouters, Guillaume Berionni
Summary: The association between pyridine and collidine with a pyramidal triarylborane belonging to the 9-boratriptycene family is explored using NMR spectroscopy and X-ray diffraction analysis. Despite the large size and steric hindrance, the boron Lewis superacid enables the formation of a stable Lewis adduct. X-ray diffraction analysis reveals an exceptional deformation of the collidine moiety, resulting in a small twist of the collidine ring into a boat-like conformation. Computational investigations suggest that steric repulsions decrease the Gibbs free energy of Lewis adduct formation.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Inorganic & Nuclear
Lei Hu, Damien Mahaut, Nikolay Tumanov, Johan Wouters, Laurent Collard, Raphael Robiette, Guillaume Berionni
Summary: The study synthesized ortho-substituted and unsymmetrical 9-phospha-triptycenes with cage-shaped structures, revealing electron-poor and greatly steric shielding effects in these phosphines. An unsymmetrical 9-phosphatriptycene was resolved by chiral HPLC, opening up new possibilities for stable P-chirogenic triarylphosphines in asymmetric transition-metal catalysis.
DALTON TRANSACTIONS
(2021)
