Article
Electrochemistry
Ikuo Nakanishi, Yoshimi Shoji
Summary: This study investigated the cyclic voltammetry behavior of DPPH· solubilized with β-cyclodextrin and found that DPPH· undergoes a reversible proton-coupled reduction with the half-wave potential shifting linearly in the negative direction as solution pH increases. The cyclic voltammogram of the oxidation of DPPH· is quasi-reversible, indicating a chemical reaction of the oxidized product.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Elena Gerasimova, Elena Gazizullina, Sofya Kolbaczkaya, Alla Ivanova
Summary: For the first time, the use of DPPH center dot as an oxidant molecule and its detection through potentiometry have been shown. The potentiometric method allows for the determination of Nernst slope and antioxidant capacity in one experiment, making it a versatile approach for studying materials of any color.
Article
Chemistry, Applied
Yi Liu, Wenjing Zhu, Xiao Yu, Hongyan Liu, Zenghui Zhang, Mei Zhang, Jinbo Zhao, Yacong Wang, Chengcai Xia
Summary: A method for synthesizing dihydropyrazoles has been developed, featuring mild reaction conditions and good functional group tolerance.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Agriculture, Dairy & Animal Science
Shiro Takeda, Abdulatef M. Ahhmed, Kazuki Sogawa, Saki Mouri, Sakurako Kaneko, Ryoichi Sakata, Wataru Mizunoya
Summary: Venison, a type of game meat, contains bioactive peptides with antioxidative properties. The study investigated the antioxidant activity of venison treated by in vitro cooking and digestion. The results showed that the digested venison had increased antioxidant activity and contained two peptides with high DPPH-RS activities.
ANIMAL SCIENCE JOURNAL
(2023)
Article
Chemistry, Physical
Sara Gomez, Natalia Rojas-Valencia, Alejandro Toro-Labbe, Albeiro Restrepo
Summary: This article explores the critical and vanishing points of reaction force and their corresponding important coordinates along the intrinsic reaction coordinate. The reaction path is divided into three well-defined regions: reactants, transition state, and products. It is found that for nonsynchronous reactions, electron activity extends beyond the transition state into the reactants and products regions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Clorice R. Reinhardt, Daniel Konstantinovsky, Alexander Soudackov, Sharon Hammes-Schiffer
Summary: This article presents a kinetic model that describes the reversible radical transfer in the enzyme ribonucleotide reductase (RNR). The model is based on experimental studies and provides insights into the time evolution and factors influencing radical transport in RNR.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Biochemistry & Molecular Biology
Ikuo Nakanishi, Yoshimi Shoji, Kei Ohkubo, Hiromu Ito, Shunichi Fukuzumi
Summary: Recent research has shown that the addition of water to the mixture of DPPH and Sc(OTf)3 can regenerate DPPH & BULL;, which is achieved through the reaction of DPPH+ with [(DPPH)(2)Sc(H2O)(3)](+). This finding is significant for studying the interaction between DPPH and metal ions as well as the activity of antioxidants.
Article
Chemistry, Organic
Xingpeng Chen, Yelong Lei, Duo Fu, Jiaxi Xu
Summary: The structurally diverse N-(2,2-diphenylvinyl)-beta-oxoamides were efficiently prepared via an electrophilic ring opening reaction, with microwave irradiation significantly accelerating the reaction rate and yielding products of good to excellent quality. This catalyst-free method is highly efficient and atom economical for the synthesis of useful synthons.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Xiaoxia Yao, Jilong Zhang, Yifei Zhu
Summary: The concerted elimination reaction class of peroxyl-hydroperoxyl alkyl radicals plays a crucial role in low-temperature combustion. By dividing reactions into subclasses and calculating energy barriers, accurate rate constants and rules are obtained to aid in constructing more accurate combustion mechanisms.
Article
Chemistry, Applied
Wen-luan Xie, Bin Hu, Wen-ming Zhang, Guo-yong Song, Ji Liu, Qiang Lu
Summary: Bimolecular interactions and tautomerization mechanisms play important roles in lignin pyrolysis. This study proposes and confirms the bimolecular tautomerization mechanism induced by concerted and radical interactions. The results reveal the influence of unimolecular and bimolecular tautomerism on product generation in lignin pyrolysis. The findings provide insights into the pyrolysis process and can contribute to the development of efficient lignin conversion technologies.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Engineering, Environmental
Boyin Yan, DongChuan Xu, Zhiquan Liu, Jiangzhou Tang, Rui Huang, Min Zhang, Fuyi Cui, Wenxin Shi, Chun Hu
Summary: The degradation of BMAA in the UV254/persulfate system follows a pseudofirst-order kinetic model, with SO4· identified as the major radical contributing to the degradation. The pH significantly affects the degradation rate, with the highest rate achieved at pH 8. However, the presence of water matrix components inhibits the degradation process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Pin Wang, Lingjun Bu, Lu Luo, Yangtao Wu, Weiqiu Zhang, Shiqing Zhou, John C. Crittenden
Summary: In this study, a novel kinetic model was developed to enrich the elementary reactions related to transformation products (TPs) in advanced oxidation processes (AOPs). The entire reaction pathways from parent organic compounds to TPs were mapped using density functional theory (DFT). The predicted concentrations of nitro-TPs obtained from the model matched previous research results, confirming the accuracy of the predictions. This research highlights the effectiveness of combining DFT and kinetic modeling in understanding TP formation and decay mechanisms in AOPs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Prithwish Ghosh, Na Yeon Kwon, Youjung Byun, Neeraj Kumar Mishra, Jung Su Park, In Su Kim
Summary: In this study, a cobalt(II)-catalyzed method for C-H alkylation and acylation of N-heterocycles using 1,4-dihydropyridines (DHPs) as alkylating and acylating agents was reported. The combination of KBrO3 and a Co(II) catalyst successfully generated alkyl and acyl radicals from DHPs. This method was applicable to various heterocycles and demonstrated selectivity in modifying drug candidates and synthesizing bioactive molecules on a gram scale.
Article
Chemistry, Multidisciplinary
Poornima Singh, Ajai K. Singh
Summary: Three Pd complexes containing tellurium ligands were reported to efficiently catalyze Suzuki-Miyaura coupling at room temperature. The optimal loading of the catalyst was found to be 0.001 mol% of Pd. Characterization of the complexes was performed using various spectroscopic techniques and their crystal structures were determined by X-ray diffraction. The Pd geometry in all complexes was nearly square planar, and the scope of their catalytic activity in Suzuki-Miyaura coupling was investigated.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Mehdi Salehisaki, Nazli E. Rad, Glen B. Deacon, Jun Wang, Zhifang Guo, Peter C. Junk
Summary: A series of rare earth N,N'-bis(aryl)formamidinate complexes were synthesized through redox transmetallation/protolysis reactions. The complexes exhibit different coordination modes and structural characteristics.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Organic
Massimo Bietti, Erica Cucinotta, Gino A. DiLabio, Osvaldo Lanzalunga, Andrea Lapi, Marco Mazzonna, Eduardo Romero-Montalvo, Michela Salamone
JOURNAL OF ORGANIC CHEMISTRY
(2019)
Article
Chemistry, Organic
Alessia Barbieri, Osvaldo Lanzalunga, Andrea Lapi, Stefano Di Stefano
JOURNAL OF ORGANIC CHEMISTRY
(2019)
Article
Chemistry, Organic
Giorgio Capocasa, Marika Di Berto Mancini, Federico Frateloreto, Osvaldo Lanzalunga, Giorgio Olivo, Stefano Di Stefano
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Inorganic & Nuclear
Francesco Tavani, Andrea Martini, Giorgio Capocasa, Stefano Di Stefano, Osvaldo Lanzalunga, Paola D'Angelo
INORGANIC CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Marika Di Berto Mancini, Andrea Del Gelsomino, Stefano Di Stefano, Federico Frateloreto, Andrea Lapi, Osvaldo Lanzalunga, Giorgio Olivo, Stefano Sajeva
Summary: The research indicates that NHPI as a mediator in HAT reactions can modify the selectivity of oxidation reactions, leading to changes in reactivity towards alkylaromatics and alcohols.
Article
Chemistry, Physical
Federico Frateloreto, Francesco Tavani, Marika Di Berto Mancini, Daniele Del Giudice, Giorgio Capocasa, Isabelle Kieffer, Osvaldo Lanzalunga, Stefano Di Stefano, Paola D'Angelo
Summary: In this study, the dissipative translocation of the Zn2+ ion between two prototypical coordination complexes was investigated using X-ray absorption and H-1 NMR spectroscopy. By combining experimental and theoretical approaches, the solution structures of the key metal coordination complexes were accurately characterized.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Arnau Vicens, Laia Vicens, Giorgio Olivo, Osvaldo Lanzalunga, Stefano Di Stefano, Miquel Costas
Summary: Site-selective oxidation of aliphatic C-H bonds is achieved using a manganese oxidation catalyst equipped with two 18-benzo-6-crown ether receptors. The catalyst shows excellent selectivity towards the central methylenic sites of the long chain tetradecane-1,14-diamine. This selective oxidation overcomes challenges associated with differentiating between similar sites in organic molecules.
FARADAY DISCUSSIONS
(2023)
Review
Chemistry, Inorganic & Nuclear
Carla Sappino, Stefano Di Stefano, Osvaldo Lanzalunga, Cristiano Zonta, Giulia Licini
Summary: This article describes two different classes of multidentate ligands (aminotriphenolate and dipyridinimine) and their corresponding metal (Ti, V, Mo, W, Fe) complexes. These catalysts efficiently activate the environmentally friendly oxidant H2O2, promoting a wide range of oxidative processes (sulfoxidations, N-oxidations, epoxidations, haloperoxidation, alcohol oxidation, hydroxylation).
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Marika Di Berto Mancini, Marianna Bernardini, Beniamin Emanuel Birzu, Arianna De Santis, Stefano Di Stefano, Federico Frateloreto, Daria Khaksar, Andrea Lapi, Giorgio Olivo, Osvaldo Lanzalunga
Summary: The chemoselectivity of S-oxidation and hydrogen atom transfer (HAT) from C-H bonds was investigated using the iron(IV)-oxo complex [(N4Py)Fe-IV(O)](2+) and the N-hydroxyphthalimide (NHPI) mediator. Kinetic analyses showed that [(N4Py)Fe-IV(O)](2+) exhibited higher reactivity for S-oxidation, while HAT was favored in the reactions promoted by NHPI oxidation. Product analysis confirmed these results, with sulfoxides being the major products in the oxidation promoted by [(N4Py)Fe-IV(O)](2+), and HAT-derived products being obtained in higher yields when NHPI was used as a mediator.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Giorgio Olivo, Giorgio Capocasa, Daniele Del Giudice, Osvaldo Lanzalunga, Stefano Di Stefano
Summary: The adoption of supramolecular approach in catalysis holds promise in addressing challenges related to activity, selectivity, and regulation. By utilizing supramolecular tools, researchers have the unique chance to unlock novel reaction pathways, alter the selectivity of reactions, and regulate catalysis. This review summarizes recent developments in supramolecular catalysis, focusing on strategies and applications in achieving desired outcomes in catalytic processes.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Federico Frateloreto, Giorgio Capocasa, Giorgio Olivo, Karim Abdel Hady, Carla Sappino, Marika Di Berto Mancini, Stefano Levi Mortera, Osvaldo Lanzalunga, Stefano Di Stefano
Summary: The study investigates the impact of bulky substituents on the catalytic reactions, confirming the significance of ligand steric hindrance on the performance of the catalyst. The results support the previously hypothesized catalytic mechanism based on the hemi-lability of the metal complex.
Article
Chemistry, Physical
Barbara Ticconi, Giorgio Capocasa, Andrea Cerrato, Stefano Di Stefano, Andrea Lapi, Beatrice Marincioni, Giorgio Olivo, Osvaldo Lanzalunga
Summary: A series of alkylaromatic compounds underwent selective aromatic ring hydroxylation catalyzed by a newly prepared imine-based non-heme iron complex with H2O2, rather than side-chain oxidation. Analysis of the oxidation products revealed that the side-chain/ring oxygenated product ratio increased as the bond dissociation energy of the benzylic C-H bond decreased.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Francesco Tavani, Giorgio Capocasa, Andrea Martini, Francesco Sessa, Stefano Di Stefano, Osvaldo Lanzalunga, Paola D'Angelo
Summary: The understanding of reactive processes involving organic substrates is crucial and requires multidisciplinary efforts. By applying a combined multivariate, statistical and theoretical analysis approach, detailed mechanistic information can be obtained for chemical reactions, enabling the structural determination of transient intermediate species and investigation of redox chemical transformations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Francesco Tavani, Giorgio Capocasa, Andrea Martini, Francesco Sessa, Stefano Di Stefano, Osvaldo Lanzalunga, Paola D'Angelo
Summary: This study utilizes time-resolved coupled X-ray Absorption Spectroscopy (XAS) and UV-Vis data to obtain detailed mechanistic and structural information on bimolecular chemical reactions occurring in solution on the second to millisecond time scales. The innovative method is applied to investigate the sulfoxidation of p-cyanothioanisole and p-methoxythioanisole by the nonheme Fe-IV oxo complex [N4Py center dot Fe-IV(O)](2+) in acetonitrile at room temperature. Statistical and multivariate techniques are employed to determine the number of key chemical species involved and derive spectral and concentration profiles for the reaction intermediates.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Giorgio Olivo, Giorgio Capocasa, Osvaldo Lanzalunga, Stefano Di Stefano, Miquel Costas
CHEMICAL COMMUNICATIONS
(2019)