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Enantio- and Diastereoselective NiH-Catalyzed Hydroalkylation of Enamides or Enecarbamates with Racemic α-Bromoamides
Angew Chem Int Ed Engl. 2023 Sep 18:e202311094. doi: 10.1002/anie.202311094. Online ahead of print.ABSTRACTCatalytic methods which control multiple stereogenic centers simultaneously are highly desirable in modern organic synthesis and chemical manufacturing. Herein, we report a regio-, enantio-, and diastereoselective NiH-catalyzed hydroalkylation process which proceeds with simultaneous control of vicinal stereocenters originating from two readily accessible partners, prochiral internal alkenes (enamides or enecarbamates) and racemic alkyl electrophiles (α-bromoamides or Katritzky salts). This reaction produces high-val...
Source: Angewandte Chemie - September 18, 2023 Category: Chemistry Authors: Jian Chen Lifu Wu Yue Zhao Shaolin Zhu Source Type: research
Photocatalyzed Aminomethylation of Alkyl Halides Enabled by Sterically Hindered N-Substituents
Angew Chem Int Ed Engl. 2023 Sep 18:e202310114. doi: 10.1002/anie.202310114. Online ahead of print.ABSTRACTThe catalytic C(sp3)-C(sp3) coupling of alkyl halides and tertiary amines offers a promising tool for the rapid decoration of amine skeletons. However, this approach has not been well established, partially due to the challenges in precisely distinguishing and controlling the reactivity of amine-coupling partners and their product homologues. Herein, we developed a metal-free photocatalytic system for the aminomethylation of alkyl halides through radical-involved C(sp3)-C(sp3) bond formation, allowing for the synthesi...
Source: Angewandte Chemie - September 18, 2023 Category: Chemistry Authors: Tianze Zhang Hanmin Huang Source Type: research
A Bismuth-Based Zeolitic Organic Framework with Coordination-Linked Metal Cages for Efficient Electrocatalytic CO2 Reduction to HCOOH
Angew Chem Int Ed Engl. 2023 Sep 18:e202311223. doi: 10.1002/anie.202311223. Online ahead of print.ABSTRACTZeolitic metal-organic frameworks (ZMOFs) have emerged as one of the most promsing catalysts for energy conversion, but they suffer from either weak bonding between metal-organic cubes (MOCs) that decrease their stability during catalysis processes or low activity due to inadequate active sites. In this work, through ligand-directing strategy, we successfully obtain an unprecedented bismuth-based ZMOF (Bi-ZMOF) featuring a ACO topological crystal structure with strong coordination bonding between the Bi-based cages. A...
Source: Angewandte Chemie - September 18, 2023 Category: Chemistry Authors: Zhi-Qiang Jiang Minyi Zhang Xing-Liang Chen Bing Wang Wen-Juan Fan Chenhuai Yang Xiaoju Yang Zhicheng Zhang Xuan Yang Chunsen Li Tianhua Zhou Source Type: research
Metal-Free Stereoconvergent C-H Borylation of Enamides
In this study, we present a general strategy for constructing β-borylenamides by C-H borylation, which provides a versatile platform for generating the stereodefined enamides. Our approach involves the utilization of metalloid borenium cation, generated through the reaction of BBr3 and enamides in the presence of two different additives, avoiding any exogenous catalyst. Importantly, the stereoconvergent nature of this methodology allows for the use of starting materials with mixed E/Z configurations, thus highlighting the unique advantage of this chemistry. Mechanistic investigations have shed light on the pivotal roles p...
Source: Angewandte Chemie - September 18, 2023 Category: Chemistry Authors: Tianhang Wang Zheng-Jun Wang Minyan Wang Lei Wu Xiaowu Fang Yong Liang Jiahang Lv Zhuangzhi Shi Source Type: research
Ultrasonic-pretreated hydrothermal synthesis of less dense zeolite CHA from the transformation of zeolite T
Ultrason Sonochem. 2023 Sep 14;100:106598. doi: 10.1016/j.ultsonch.2023.106598. Online ahead of print.ABSTRACTBecause of containing the same double 6-ring (D6R) building unit, the pure zeolite CHA with lower framework density (FDSi = 15.1 T/1000 Å3) has been transformed from zeolite T with higher framework density (FDSi = 16.1 T/1000 Å3) through ultrasonic-pretreated hydrothermal synthesis in MOH (KOH and NaOH) solution without adding organic template or seed crystals. Ultrasonic pretreatment facilitates the transformation rate and generates high-quality zeolite CHA. The ultrasound condition should be precisely controlle...
Source: Ultrasonics Sonochemistry - September 18, 2023 Category: Chemistry Authors: Xiaoyan Yin Ning Liu Muhua Han Fan Xu Yun Jia Feng Song Hongyou Cui Source Type: research
Removing DOM from chloride modified hydrochar could improve Cu < sup > 2+ < /sup > adsorption capacity from aqueous solution
This study found that the content and composition of hydrochar-based DOM could be a major driving factor for Cu2+ adsorption.PMID:37722538 | DOI:10.1016/j.chemosphere.2023.140202
Source: Chemosphere - September 18, 2023 Category: Chemistry Authors: Rushi Yang Shi Feng Danyu Jin Yulai Wang Detian Li Yunyi Liang Jing Wu Source Type: research
Unlocking the secrets of soil microbes: How decades-long contamination and heavy metals accumulation from sewage water and industrial effluents shape soil biological health
Chemosphere. 2023 Sep 16:140193. doi: 10.1016/j.chemosphere.2023.140193. Online ahead of print.ABSTRACTHeavy metals contamination is posing severe threat to the soil health and environmental sustainability. Application of industrial and sewage waste as irrigation and growing urbanization and agricultural industry is the main reason for heavy metals pollution. Therefore, the present study was planned to assess the influence of different irrigation sources such as industrial effluents, sewage wastewater, tube well water, and canal water on the soil physio-chemical, soil biological, and enzymatic characteristics. Results show...
Source: Chemosphere - September 18, 2023 Category: Chemistry Authors: Idrees Haider Muhammad Arif Ali Muhammad Sanaullah Niaz Ahmed Sajjad Hussain Muhammad Taimoor Shakeel Syed Atif Hasan Naqvi Javeed Shabbir Dar Mahmoud Moustafa Mohammed O Alshaharni Source Type: research
Improved photocatalytic activity of TiO < sub > 2 < /sub > with a regulated covalent organic framework thin film
Chem Commun (Camb). 2023 Sep 18. doi: 10.1039/d3cc03305h. Online ahead of print.ABSTRACTIn this work, one-dimensional TiO2 nanotube arrays are coupled with a covalent organic framework (COF) thin film with a controlled thickness to form a three-dimensional heterojunction, which exhibits a 3.3-fold higher hydrogen evolution rate than that of TiO2, and becomes active for CO2 conversion, compared to the bare COF. Such high activity results from the large difference in Fermi levels forming an internal electric field at the interface.PMID:37721474 | DOI:10.1039/d3cc03305h
Source: Chemical Communications - September 18, 2023 Category: Chemistry Authors: Xiaochi Han Wenbo Dong Longyu Li Xuemei Zhou Source Type: research
Phosphorus doped cyanobacterial biochar catalyzes efficient persulfate oxidation of the antibiotic norfloxacin
This study demonstrates a new way reusing waste biomass producing efficient P-doped metal-free biochars and presents a basic framework for designing carbon-based catalysts for organic pollutant degradation.PMID:37722544 | DOI:10.1016/j.biortech.2023.129785
Source: Bioresource Technology - September 18, 2023 Category: Biotechnology Authors: Chen Wang Peter E Holm Mogens Larsen Andersen Lisbeth Garbrecht Thygesen Ulla Gro Nielsen Hans Christian Bruun Hansen Source Type: research
Carbon/nitrogen flows and associated microbial communities in full-scale foodwaste treatment plants
This study collected samples of different foodwaste treatment units from five full-scale FWTPs to analyze the C/N flows and microbial communities in foodwaste treatment processes. Results showed that 39.8-45.0% of organic carbon in foodwaste was converted into biogas. Hydrolytic acidogenic bacteria (e.g., Lactobacillus and Limosilactobacillus) and eukaryota (e.g., Cafeteriaceae, Saccharomycetales, and Agaricomycetes) were more abundant in feedstock and pretreatment units. Redundancy analyses showed that acidogens were major players in the transformation of foodwaste organic matter. Populations of W27 and Tepidanaerobacter ...
Source: Bioresource Technology - September 18, 2023 Category: Biotechnology Authors: Haihong Jiang Weijun Gao Qihong Lu Shanquan Wang Source Type: research
Terbium-based dual-ligand metal organic framework by diffusion method for selective and sensitive detection of danofloxacin in aqueous medium
Environ Sci Pollut Res Int. 2023 Sep 18. doi: 10.1007/s11356-023-29895-7. Online ahead of print.ABSTRACTA water-dispersible Tb(III)-based metal organic framework (TBP) was produced by diffusion technique using benzene-1,3,5-tricarboxylic acid (BTC) and pyridine as easily accessible ligands at low cost. The as-synthesized TBP with a crystalline structure and rod-shaped morphology has exhibited thermal stability up to 465 °C. Elemental analysis confirmed the presence of carbon, oxygen, nitrogen, and terbium in the synthesized MOF. TBP was used as a fluorescent probe for detection of danofloxacin (DANO) in an aqueous medium ...
Source: Environmental Science and Pollution Research International - September 18, 2023 Category: Environmental Health Authors: Gurdeep Singh Deepika Garg Sanjay Kumar Rajpal Verma Ashok Kumar Malik Source Type: research
Dipropyl ammonium ionic liquids to prepare Ti/RuO < sub > 2 < /sub > -Sb < sub > 2 < /sub > O < sub > 4 < /sub > anodes at different calcination temperatures
Environ Sci Pollut Res Int. 2023 Sep 18. doi: 10.1007/s11356-023-29742-9. Online ahead of print.ABSTRACTThe development of technologies capable of producing efficient and economically viable anodes is essential for the electrochemical treatment of water contaminated with complex organic pollutants. In this context, the use of ionic liquids as solvents to prepare mixed metal oxide (MMO) anodes has proven to be an up-and-coming alternative. Here, we analyze the influence of the temperature of calcination (300, 350, and 400 ºC) on the production of Ti(RuO2)0.8-(Sb2O4)0.2 anodes made using the thermal decomposition method usi...
Source: Environmental Science and Pollution Research International - September 18, 2023 Category: Environmental Health Authors: Ra íra Souza de Santana Castro Aline Resende D ória Fabio Costa Silvana Mattedi Katlin Ivon Barrios Eguiluz Giancarlo Richard Salazar-Banda Source Type: research
Research progress of MOF-based membrane reactor coupled with AOP technology for organic wastewater treatment
Environ Sci Pollut Res Int. 2023 Sep 18. doi: 10.1007/s11356-023-29852-4. Online ahead of print.ABSTRACTMOF-based catalytic membrane reactor (MCMR), which can simultaneously achieve membrane separation and chemical catalytic degradation in an integrated system, is a cutting-edge technology for effective treatment of organic pollutants in water. The coupling of MCMR and advanced oxidation process (AOP) not only significantly improves the pollutant removal efficiency but also inhibits the membrane pollution through self-cleaning effect, thus improving the stability of MCMR. This paper reviews different MCMR systems combined ...
Source: Environmental Science and Pollution Research International - September 18, 2023 Category: Environmental Health Authors: Ziyang Zhang Shujuan Xiao Xianguang Meng Shouwu Yu Source Type: research
Spinel ferrite nanoparticles as potential materials in chlorophenol removal from wastewater
Environ Sci Pollut Res Int. 2023 Sep 18. doi: 10.1007/s11356-023-29809-7. Online ahead of print.ABSTRACTPersistent organic pollutants (POPs) including chlorophenols (CPs) are increasing in water effluents, creating serious problems for both aquatic and terrestrial lives. Several research attempts have considered the removal of CPs by functionalised nanomaterials as adsorbents and catalysts. Besides the unique crystal structure, spinel ferrite nanomaterials (SFNs) own interesting optical and magnetic properties that give them the potential to be utilised in the removal of different types of CPs. In this review, we highlight...
Source: Environmental Science and Pollution Research International - September 18, 2023 Category: Environmental Health Authors: Basma Al-Najar Ayman H Kamel Hanan Albuflasa Nicholas P Hankins Source Type: research
Low-cost materials for swine wastewater treatment using adsorption and Fenton's process
Environ Sci Pollut Res Int. 2023 Sep 18. doi: 10.1007/s11356-023-29677-1. Online ahead of print.ABSTRACTUntreated swine wastewater (SW) discharge leads to serious consequences such as water quality decreasing related to eutrophication and proliferation of harmful algae containing cyanotoxins, which can cause acute intoxication in humans. The use of untreated pig farming effluent as fertilizer can lead to the accumulation of polluting compounds. Biological treatments can degrade organic matter but have the disadvantage of requiring large areas and high retention times and demonstrating low efficiencies in the degradation of...
Source: Environmental Science and Pollution Research International - September 18, 2023 Category: Environmental Health Authors: Eva Domingues Jo ão Lincho Maria J Fernandes Jo ão Gomes Rui C Martins Source Type: research
