Article
Chemistry, Applied
Mozhgan Esmati, Behzad Zeynizadeh
Summary: The study investigated the synthesis and characterization of modified GO and rGO@Fe3O4@Ni composite systems. Various analytical techniques were employed to characterize the prepared nanomaterials, and the catalytic activities of different materials were compared in multicomponent coupling reactions. The efficient magnetic nanocatalyst rGO@Fe3O4@Ni was successfully applied to facilitate the reactions, showing sustainable catalytic activity over multiple reaction cycles.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Denis D. Borisov, Roman A. Novikov, Yury Tomilov
Summary: The reactions of styrylmalonates with aromatic aldehydes in the presence of Lewis and Bronsted acids, along with their regularities, have been studied in detail. Various approaches have been developed for the synthesis of polysubstituted compounds with control over chemo-, regio-, stereo-, and diastereoselectivity. The mechanisms of these reactions were extensively studied using multinuclear NMR experiments, monitoring reactions in NMR tubes, and O-18 isotope labeling.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Applied
Leila Pakjo, Shabnam Rahimpour, Reza Teimuri-Mofrad
Summary: A novel nanomagnetic catalyst, composed of a nanomagnetic bisethylferrocene-containing ionic liquid (IL) supported on silica-coated Fe3O4, was synthesized using a simple chemical co-precipitation procedure. The catalytic activities of this catalyst were evaluated in the one-pot synthesis of hydroxycoumarin derivatives, showing excellent catalytic performance with short reaction time, high yield, eco-friendly properties, and easy work-up.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Subhankar Sarkar, Rana Chatterjee, Anindita Mukherjee, Debosmita Mukherjee, Narayan Chandra Mandal, Sachinta Mahato, Sougata Santra, Grigory Zyryanov, Adinath Majee
Summary: The use of imidazolium zwitterionic molten salt as an organocatalyst for ball-milling synthesis of 4-hydroxy-3-thiomethylcoumarin derivatives has shown to be efficient and convenient. The method offers mild conditions, wide substrate scope, and good scalability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Organic
Sajjad Ahmed, Mohammad Yaqoob Bhat, Feroze Hussain, Qazi Naveed Ahmed
Summary: In this study, the activation of diphenyl phosphite by BF3/BF4(-) resulted in the formation of thionium ions from aldehydes and thiophenols. These reactive species then reacted with in situ generated phenol, leading to the synthesis of diarylmethyl thioethers. It was found that the addition of external phenol in the reaction yielded unsymmetrical gem-diarylmethyl thioethers in good yields.
Article
Chemistry, Multidisciplinary
Azar Jahanbakhshi, Mahnaz Farahi
Summary: In this study, immobilized nickel complex on cellulose@Fe3O4 (Ni-oPDA@Cell@Fe3O4) was synthesized, characterized, and applied as a new heterogeneous catalyst. The nanocomposite exhibited remarkable catalytic efficacy for synthesizing sulfonamide-substituted 4-hydroxycoumarins via a three-component reaction. The key features of this protocol include reusability of the catalyst, easy accessibility to starting materials, easy magnetic recovery, and eco-friendly and cost-effective conditions.
MONATSHEFTE FUR CHEMIE
(2023)
Review
Chemistry, Applied
Lukas Schober, Hana Dobiasova, Valentina Jurkas, Fabio Parmeggiani, Florian Rudroff, Margit Winkler
Summary: Many aldehydes have distinct smells and are reactive functional groups used in various product synthesis. This review explores the enzymatic reactions producing aldehydes in biological systems and beyond, with some of these reactions being applicable in industrial biocatalysts.
FLAVOUR AND FRAGRANCE JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Michail N. Elinson, Yuliya E. Ryzhkova, Fedor Ryzhkov
Summary: This review systematically presents data on the methods for the preparation of chromeno[2,3-b]pyridines, including multicomponent and pseudo-multicomponent synthetic approaches. It also discusses the characteristics and mechanisms of reactions, as well as the biological activity and other applications of the obtained compounds.
RUSSIAN CHEMICAL REVIEWS
(2021)
Article
Chemistry, Organic
Swetha Sathyendran, Kesavan Muthu, Karthick Govindan, Nian-Qi Chen, Wei-Yu Lin, Gopal Chandru Senadi
Summary: A FeCl3-catalyzed decyanation of alpha-aminonitriles followed by a [4 + 2] annulation with terminal alkynes has been developed for the synthesis of 2,4-diaryl quinolines. The reaction showed good tolerance towards various aniline, aldehyde, and arylacetylene derivatives, providing moderate to good yields of the desired products. Control experiments suggested a nonradical pathway involving Povarov-type [4 + 2] annulation from an in situ generated iminium species. The method demonstrated the capability for gram-scale synthesis, continuous-flow process, and successful application with styrene.
Article
Chemistry, Multidisciplinary
Abhijeet S. Patki, Komal N. Patil, Suman Kusuma, Dnyanoba B. Muley, Arvind H. Jadhav
Summary: The researchers presented an environmentally friendly procedure for the synthesis of pyrazole and its derivatives using SPVA as a heterogeneous acid catalyst. The SPVA catalyst showed good catalytic performance in multicomponent reaction, with high yield and recyclability.
RESEARCH ON CHEMICAL INTERMEDIATES
(2021)
Review
Chemistry, Organic
Akash. G. G. Tathe, Sagar. S. S. Saswade, Nitin. T. T. Patil
Summary: Multicomponent reactions (MCRs) are an important branch in organic synthesis, allowing the construction of complex molecular structures from multiple starting materials in a single reaction. Traditionally, transition metals have been used as catalysts for MCRs, and numerous reviews have been published on this topic. Gold, on the other hand, offers unique reactivity profiles, enabling the synthesis of previously inaccessible molecules. In recent years, gold catalysts have emerged as powerful contenders for achieving MCRs with distinct mechanisms. This comprehensive review provides an overview of the state-of-the-art in the development of gold-catalyzed MCRs, with a focus on recent advancements.
ORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Farhad Sedighi Pashaki, Mohammad Nikpassand
Summary: Fe3O4@SiO2@Tannic acid was used as a catalyst to successfully synthesize high-yield 5-amino-pyrazole-4-carbonitrile compounds with short reaction times and easy recyclability for multiple cycles. These structures were confirmed by H-1 NMR, C-13 NMR, FTIR spectra, and elemental analyses.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Organic
Ekaterina Levashova, Maria Adamchik, Grigory Kantin, Dmitry Dar'in
Summary: Here, a chemo- and diastereoselective formal C-C insertion reaction was described, which introduced 1,2-disubstituted 4-diazo-3(2H)-isoquinolones and 4-diazoisochroman-3-one into the C-CHO bonds of aldehydes, resulting in all-carbon α-quaternary aldehydes bearing medicinally important 1,4-dihydro-3(2H)-isoquinolone scaffold. The protocol exhibited preferential 1,2-carbon migration over the common 1,2-H shift, and the reaction tolerated various functionalities in both aldehyde and diazo components, providing the target homologated aldehydes in generally high yields. The synthetic utility of this method was further demonstrated by transformations of the formyl moiety.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Mozhgan Esmati, Behzad Zeynizadeh
Summary: Modified graphene oxide and composite nanomaterial were synthesized and applied as catalysts in multicomponent coupling reactions, showing efficient catalytic activity and good reusability.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Jun Zheng, Shuhua Fan, Sen Liu, Guodong Shen, Wei-Dan Si, Xinyi Dong, Xianqiang Huang, Yalin Zhang, Qingxia Yao, Zhen Li, Di Sun
Summary: A facile ball-milling strategy was reported for the gram-scale preparation of efficient polyoxometalate catalysts, which showed high catalytic activity for cascade reactions and potential inhibitory effects on cancer cells.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)