Review
Chemistry, Multidisciplinary
Asish Kumar Dey, Sasadhar Majhi
Summary: Lanthanides have shown great potential in various fields, including magnetic materials, telecommunications, catalysis, and medicine. Lanthanide complexes, particularly samarium-based derivatives, have been widely used in organic transformations. Among different metal triflates, samarium(III) triflate has significant contributions in organic synthesis due to its moisture tolerance and reusability as a Lewis catalyst under mild conditions. This review aims to highlight the efficient catalytic properties of samarium(III) triflate and its applications in organic synthesis.
Article
Chemistry, Physical
Pedro Castro-Fernandez, Deni Mance, Chong Liu, Paula M. Abdala, Elena Willinger, Aurelio A. Rossinelli, Alexander I. Serykh, Evgeny A. Pidko, Christophe Coperet, Alexey Fedorov, Christoph R. Mueller
Summary: This study investigates the effect of H2 treatment on the structure, acidity, and catalytic activity of γ/β-Ga2O3 nanoparticle catalysts. The results show that the presence of the β-Ga2O3 phase increases the PDH activity of the catalysts, and H2 treatment enhances the catalytic activity for all three catalysts through different mechanisms.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Mingchun Ye, Mi Jen Kuo, Raul F. Lobo
Summary: The substrate scope of the Diels-Alder-Dehydration reaction was expanded to the deactivated bifuran structure. Dimethyl biphenyl-4,4 '-dicarboxylate (1) and methyl 5- [4-(methoxycarbonyl)phenyl]-2-furoate (2) were synthesized via metal-triflate-catalyzed Diels-Alder-Dehydration reaction with ethene. A 31% yield of (1) was obtained using Sc(OTf)3 catalyst, and a 76.6% yield of (2) was obtained using La(OTf)3 catalyst. This approach is selective to the 4,4 '-dicarboxylates and avoids the methyl-group oxidation step in the dimethyl-biphenyl route.
MOLECULAR CATALYSIS
(2023)
Review
Chemistry, Inorganic & Nuclear
Kefeng Ping, Rohit Bhadoria, Pavel Starkov, Nadezda Kongi
Summary: M-N-C materials are versatile and potential catalysts in organic transformations. This review provides a comprehensive overview of their reactivity, synthesis methods, and discusses the challenges and potential research directions for improving their stability and performance.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Statistics & Probability
Jacob W. Priddle, Scott A. Sisson, David T. Frazier, Ian Turner, Christopher Drovandi
Summary: Likelihood-free methods are often used for approximate Bayesian inference in models with intractable likelihood functions, but can be computationally demanding. Bayesian synthetic likelihood (BSL) is a popular method that approximates the likelihood function of summary statistics and performs statistical inference. Whitening BSL (wBSL) is a proposed efficient method that uses approximate whitening transformations to reduce the number of model simulations required, showing promising results in ecology and biology modeling scenarios.
JOURNAL OF COMPUTATIONAL AND GRAPHICAL STATISTICS
(2022)
Article
Chemistry, Physical
Yanpeng Gao, Le Guo, Xiutang Zhang
Summary: In this study, a highly robust dual-channel material OIM-1 was synthesized, which is built on the combination of wave-like [Lu2(CO2)6(OH2)2]n chains and [Lu(CO2)4(NO3)(OH2)] units. OIM-1 exhibits excellent physicochemical properties such as solvent-free dual channels, bigger specific surface area, high porosity, and thermal stability. As a heterogeneous catalyst, activated OIM-1 shows high catalytic performance on the cycloaddition reaction of CO2 with epoxides under mild solvent-free reaction conditions.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Review
Chemistry, Multidisciplinary
Mingxin Liu, Lida Tan, Baowen Zhou, Lu Li, Zetian Mi, Chao-Jun Li
Summary: III-nitrides have revolutionized everyday life with applications in LED lighting and power electronics. This review explores their use as catalysts in activating covalent bonds in organic molecules, potentially inspiring innovations in semiconductor catalysis and fostering interdisciplinary collaborations.
Article
Chemistry, Multidisciplinary
Alexis Munyentwali, Chunzhi Li, He Li, Qihua Yang
Summary: This study presents a new strategy for the synthesis of sulfonated porous organic polymers (S-PT) with improved hydrophobicity, achieved through free radical polymerization using a rigid and multidentate monomer with a hydrophobic core. The optimization of sulfonation time established a balance between acidity and hydrophobicity. Moreover, under optimized conditions, S-PT exhibited higher activity in organic esterification reactions compared to commercial catalysts like Amberlyst-15 and Nafion NR50.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Review
Chemistry, Organic
Dipakkumar Bariya, Chandni Halpani, Satyendra Mishra
Summary: This article highlights the importance of calcium-based reagents in organic transformations. Calcium complexes can activate and nucleophilically add different functional groups, showing broad substrate tolerance. Calcium-based catalysts may serve as sustainable alternatives to transition metals and rare earth metals.
CURRENT ORGANIC CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Lipipuspa Sahoo, Sanjit Mondal, Nayana Christudas Beena, A. Gloskovskii, Unnikrishnan Manju, D. Topwal, Ujjal K. Gautam
Summary: Efficient recovery of noble metal nanocrystals for organic transformations has been a challenge, but in this study, highly catalytic Pd nanoparticles were successfully prepared and embedded in mechanically robust polyurethane foam for effective and recyclable use. The Pd-PUF showed negligible leaching and maintained activity over multiple catalytic cycles, demonstrating its potential for industrial applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Nilanjana Sen, Prachi Gothe, Pallavi Sarkar, Shubhajit Das, Srinu Tothadi, Swapan K. Pati, Shabana Khan
Summary: The synthesis of novel stibenium cations and their catalytic application in the cyanosilylation of carbonyl compounds have been described. Compound 4 exhibited excellent catalytic activity towards the reaction of aldehydes and ketones.
CHEMICAL COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Shashi Kanth Boddu, Najeeb Ur Rehman, Tapan Kumar Mohanta, Anjoy Majhi, Satya Kumar Avula, Ahmed Al-Harrasi
Summary: 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) is an important catalyst in organic synthesis due to its ability to catalyze organic reactions under mild conditions. It offers operational simplicity by reducing side products and waste and has advantages of being less expensive, commercially readily available, easy to handle, and recoverable. DBU has been widely explored for various organic transformations, showing impressive selectivity (chemo-, regio-, and stereo-) and applicability in modern chemical transformations. It has enhanced basic properties and high mechanical and thermal stability. Numerous publications have appeared in the literature on organic transformations catalyzed by DBU, indicating its significant importance in organic synthesis.
GREEN CHEMISTRY LETTERS AND REVIEWS
(2022)
Review
Chemistry, Inorganic & Nuclear
Kuan-Guan Liu, Zahra Sharifzadeh, Farzaneh Rouhani, Massomeh Ghorbanloo, Ali Morsali
Summary: MOFs have been widely used as catalysts due to their brilliant characteristics, and the composite method is an important approach to optimize their performance. Green MOF composites show great potential in environmental-friendly catalysis applications.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Diego Seckler, Camila M. Dea, Elise Ane Maluf Rios, Marcelo de Godoi, Daniel da Silveira Rampon, Marcelo Goncalves Montes D'Oca, Caroline Da Ros Montes D'Oca
Summary: In this study, Water Extract of Rice Straw Ash (WERSA) was used as an efficient sustainable approach for the Knoevenagel reaction. Glycerol was employed as a co-solvent. No additional catalysts, bases, ligands, or promoters were used. The reagent solubility was increased by WERSA, resulting in high yields of alpha,beta-unsaturated carbonyl compounds. The WERSA/glycerol mixture can be reused and showed versatility in the synthesis of heterocyclic moieties.
NEW JOURNAL OF CHEMISTRY
(2022)
Review
Chemistry, Physical
Artem S. Belousov, Anton L. Esipovich, Evgeny A. Kanakov, Ksenia Otopkova
Summary: Green chemistry offers researchers the potential to design products and processes that reduce or eliminate the use of hazardous substances in chemical engineering. Fatty acid methyl esters have great potential in the chemical industry due to their catalytic conversion capabilities, producing a wide range of useful chemicals. Glycerol, a versatile chemical produced through transesterification of vegetable oils, is an important byproduct of biodiesel production.
SUSTAINABLE ENERGY & FUELS
(2021)
Article
Biochemical Research Methods
Deepti Katiyar, Rashmi Saxena, Abhishek Kumar, Surya Prakash, Abhay Bhardwaj, Priya Bansal
Summary: This article presents a literature metasynthesis on Bryonia laciniosa, highlighting its phytochemical and therapeutic profile. The plant exhibits a range of pharmacological activities including antimicrobial, anti-inflammatory, analgesic, antipyretic, anticonvulsant, anti-asthmatic, anticancer, antioxidant, antidiabetic, and aphrodisiac effects.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2023)
Article
Chemistry, Physical
Dean E. Glass, Vicente Galvan, Marc Iulliucci, G. K. Surya Prakash
Summary: This study investigates the role of partially fluorinated carbon (CFx) supported platinum nanoparticles as electrodes in a proton exchange membrane fuel cell (PEMFC) for hydrogen fuel cell applications. The results show that CFx, as a platinum catalyst support, exhibits better oxygen reduction reaction (ORR) kinetics compared to the widely used Vulcan Carbon (XC-72R). CFx catalysts display higher ORR kinetics at lower platinum loadings, while XC-72R displays higher kinetics at higher platinum loadings. The PEMFC tests reveal that CFx supported catalysts exhibit a 20% increase in fuel cell performance and an 11% decrease in charge transfer resistance compared to XC-72R supported catalysts. Furthermore, using CFx as the support for both anode and cathode electrodes leads to a 15% increase in power density compared to XC-72R supported catalysts.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Organic
Daniel Lin, G. K. Surya Prakash
Summary: A new radical difluoromethoxylating reagent has been developed for the direct C(sp(2))-H difluoromethoxylation of (hetero)arenes under blue light photoredox catalysis. The method tolerates a variety of functional groups and has a simple synthetic procedure.
Article
Geosciences, Multidisciplinary
K. A. Kamesh Raju, V. Yatheesh, A. Srinivas Rao, L. Surya Prakash, Durbar Ray, Abhay Mudholkar, Kiranmai Samudrala, Nico Augustin, P. John Kurian
Summary: The topographic fabric of the rift valley floor in a segment of the slow-spreading Central Indian Ridge was analyzed using data obtained by the autonomous underwater vehicle (AUV) Abyss. The AUV dives revealed features such as a lava lake, a cratered volcano, an oceanic core complex (OCC), and a foot wall volcanic complex. The analysis of CTD data indicated the presence of temperature spikes related to leaky venting of fluids from a linear fissure on the seafloor.
GEO-MARINE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Christopher J. J. Koch, Anushan Alagaratnam, Alain Goeppert, G. K. Surya Prakash
Summary: Cellulose, a major component of plant matter, is a potential target for biomass conversion to fuels. Direct conversion of cellulose to methane using nickel-based catalysts often faces challenges due to carbon agglomeration. The addition of rare-earth metals as promoters increases cellulose conversion to methane, but leads to catalyst deactivation in the form of nickel-rare-earth-carbon nanoparticles. Adding zinc metal as an additional promoter eliminates carbon agglomeration and improves methane yields. This study reports an 81% methane yield from cellulose within 48 hours using a Ni/Zn/Y/Al2O3 catalyst, at 225 degrees C and under 50 bar H-2 pressure.
ISRAEL JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Organic
Xanath Ispizua-Rodriguez, Vinayak Krishnamurti, Vanessa Carpio, Colby Barrett, G. K. Surya Prakash
Summary: An efficient method for direct difluoromethylation of terminal alkynes and desilylation-difluoromethylation of (trimethylsilyl)acetylenes is reported. Copper-catalyzed transformation using a (difluoromethyl)zinc reagent and an organic oxidant provides access to a variety of structurally diverse CF2H alkynes in good yields. The synthetic utility of these (difluoromethyl)alkynes is demonstrated by selected cycloaddition reactions, and a slight modification to the reaction conditions allows the selective preparation of a 2-difluoromethylindole.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
P. Linsy, L. Surya Prakash, Parijat Roy, Muhammad Shuhail, P. John Kurian
Summary: This study conducted a detailed investigation on the geochemical characteristics of iron using a sediment core from the eastern Southwest Indian Ridge. The results revealed that a significant amount of hydrothermal iron precipitates near the source and plays a crucial role in oceanic elemental cycling.
Article
Chemistry, Multidisciplinary
Daniel Lin, Juan Pablo de los Rios, G. K. Surya Prakash
Summary: N-(difluoromethyl)amino (-NCF2H) compounds have unique and underexplored physiochemical properties, but lack structural diversity due to a shortage of efficient installation protocols. This study presents a new shelf-stable pyridinium reagent that enables direct installation of the N-(difluoromethyl)sulfonamide moiety onto (hetero)arenes and alkenes, diversifying the aryl and alkyl NCF2H compounds. The protocol utilizes blue light photoredox catalysis, demonstrating broad functional group tolerance and excellent chemoselectivity. Additional transformations and applicability towards a photoredox continuous flow protocol are also shown.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Daniel Lin, Matthew Coe, Vinayak Krishnamurti, Xanath Ispizua-Rodriguez, G. K. Surya Prakash
Summary: In recent years, many reagents and protocols have been developed for efficient fluorofunctionalization of various scaffolds. Organofluorine chemistry and visible light-mediated synthesis have played complementary roles in expanding the fields and discovering new bioactive compounds. This review focuses on the recent advances made in visible light-mediated fluoroalkylation and heteroatom centered radical generation.
Article
Engineering, Electrical & Electronic
Vivek Singh Baghel, Surya Prakash
Summary: Biometric authentication systems are widely used for securing various applications, including consumer electronics devices. However, the increased use of biometric authentication poses the risk of permanently compromising a person's biometric identity, as biometric data cannot be changed. This paper proposes a secure and non-invertible fingerprint based user template protection technique, which utilizes 3D-grid mapping and Discrete Fourier Transform. The technique is evaluated using publicly available fingerprint databases and demonstrates superior results compared to state-of-the-art techniques.
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Alexander Knieb, Vinayak Krishnamurti, Ziyue Zhu, G. K. Surya Prakash
Summary: A metal-free protocol for the synthesis of monofluoromethylarenes using diaryliodonium salts and fluorobis (phenylsulfonyl)methane (FBSM) is presented as an alternative to traditional metal-mediated monofluoromethylation reactions. Inexpensive and accessible starting materials are utilized, and the target products are obtained with excellent yields (up to 97%) and good functional group tolerance. The counter anion of the iodonium species is found to significantly affect the reaction yield, and the ionic nature of the reaction mechanism is elucidated using Hammett's linear free energy analysis, supported by control experiments.
JOURNAL OF FLUORINE CHEMISTRY
(2023)
Article
Chemistry, Physical
Christopher J. Koch, Zohaib Suhail, Alain Goeppert, G. K. Surya Prakash
Summary: Rising CO2 levels enhance the greenhouse gas effect in the atmosphere, but CO2 can be captured and converted to methane using hydroxide salts and catalysts.
Review
Chemistry, Inorganic & Nuclear
Thomas Mathew, Socrates B. Munoz, Olivier Forni, Alain Tressaud, G. K. Surya Prakash
Summary: Fluorine plays a significant role in the geochemical world, affecting the properties of chemical compounds both on Earth and in extraterrestrial regions. The study of its origin and abundance is crucial for understanding its relevance to terrestrial chemistry and its presence in other planets and star-forming galaxies. The literature review reveals the presence of fluorine in various extraterrestrial regions, indicating its ubiquity in the stellar and interstellar medium. Further research on the fluorine effect in extraterrestrial atmospheres is important due to its growing influence on Earth.
JOURNAL OF FLUORINE CHEMISTRY
(2023)
Article
Chemistry, Physical
Christopher J. Koch, Anushan Alagaratnam, Alain Goeppert, G. K. Surya Prakash
Summary: Phosphate salts have been studied as carbon dioxide capture reagents, but their role in the direct conversion of captured carbon dioxide to hydrogenated products is not well understood. In this study, we report the conversion of captured carbon dioxide to methane in a phosphate-assisted system. While a nickel-based catalyst showed strong inhibition due to unwanted interaction with phosphate species, 5% Ru/Al2O3 catalyst achieved 100% conversion of captured CO2 to methane after 6 hours under 50 bar H-2 at 200 degrees C. The 5% Ru/Al2O3 catalyst also maintained its reactivity over multiple capture/hydrogenation cycles.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Multidisciplinary
Christopher J. Koch, Vicente Galvan, Alain Goeppert, G. K. Surya Prakash
Summary: The direct conversion of inorganic carbonate salts into methane using Ni/Al2O3 and Ni/CaAl2O4 catalysts under 50 bar of hydrogen at a temperature of 225 degrees C is reported. Water improved the conversion rate and the Ni/Al2O3 catalyst retained 99% of its activity after five hydrogenation cycles. The metal hydroxide was regenerated and reused to capture CO2 for subsequent reactions. Compared to the sequential approach, this integrated route offers energetic and economic benefits for carbon capture and conversion.