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https://www.readbyqxmd.com/read/28819708/in-situ-remediation-of-chlorinated-solvent-contaminated-groundwater-using-zvi-organic-carbon-amendment-in-china-field-pilot-test-and-full-scale-application
#1
Jie Yang, Liang Meng, Lin Guo
Chlorinated solvents in groundwater pose threats to human health and the environment due to their carcinogenesis and bioaccumulation. These problems are often more severe in developing countries such as China. Thus, methods for chlorinated solvent-contaminated groundwater remediation are urgently needed. This study presents a technique of in situ remediation via the direct-push amendment injection that enhances the reductive dechlorination of chlorinated solvents in groundwater in the low-permeability aquifer...
August 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28817208/regio-and-stereoselective-chlorocyanation-of-alkynes
#2
Manuel Alcarazo, Alejandro G Barrado, Richard Goddard, Adam Zielinski
The regio- and stereoselective conversion of alkynes into (Z)-3-chloroacrylonitriles was achieved by treatment of a variety of terminal as well as internal alkynes with BCl3 in the presence of stoichiometric amounts of imidazolium thiocyanates. These products can be easily functionalized into useful building blocks, demonstrating the synthetic value of the method. Preliminary mechanistic studies suggest initial activation of the cationic thiocyanate by the Lewis acid followed by electrophilic attack of the alkyne...
August 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28813067/total-syntheses-of-smenothiazoles-a-and-b
#3
Xiao Ma, Yajie Chen, Sigui Chen, Zhengshuang Xu, Tao Ye
Concise total syntheses of smenothiazoles A (1) and B (2), two distinguished vinyl chloride containing natural products isolated from the marine sponge S. aurea, have been developed. Silastannation, Stille reaction and a carefully controlled desilylchlorination were employed as key steps to construct unique polyketide acid fragments, and the optimized reaction conditions avoided migration of 2,5-diene to a 2,4-conjugated system. This report unambiguously confirmed the structures of both natural products.
August 16, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28809851/grape-pomace-compost-harbors-organohalide-respiring-dehalogenimonas-species-with-novel-reductive-dehalogenase-genes
#4
Yi Yang, Steven A Higgins, Jun Yan, Burcu Şimşir, Karuna Chourey, Ramsunder Iyer, Robert L Hettich, Brett Baldwin, Dora M Ogles, Frank E Löffler
Organohalide-respiring bacteria have key roles in the natural chlorine cycle; however, most of the current knowledge is based on cultures from contaminated environments. We demonstrate that grape pomace compost without prior exposure to chlorinated solvents harbors a Dehalogenimonas (Dhgm) species capable of using chlorinated ethenes, including the human carcinogen and common groundwater pollutant vinyl chloride (VC) as electron acceptors. Grape pomace microcosms and derived solid-free enrichment cultures were able to dechlorinate trichloroethene (TCE) to less chlorinated daughter products including ethene...
August 15, 2017: ISME Journal
https://www.readbyqxmd.com/read/28809497/a-chlorinating-reagent-yields-vinyl-chlorides-with-high-regioselectivity-under-heterogeneous-gold-catalysis
#5
Shengzong Liang, Rene Ebule, Gerald B Hammond, Bo Xu
A novel chlorinating reagent with a high concentration of HCl has enabled the highly regioselective hydrochlorination of unactivated alkynes using a commercial nanogold catalyst. No overchlorination or hydration products were formed, and various functional groups were tolerated. This hydrochlorination method could be conducted under open air.
August 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/28801216/a-novel-process-for-separation-of-hazardous-poly-vinyl-chloride-from-mixed-plastic-wastes-by-froth-flotation
#6
Jianchao Wang, Hui Wang, Chongqing Wang, Lingling Zhang, Tao Wang, Long Zheng
A novel method, calcium hypochlorite (CHC) treatment, was proposed for separation of hazardous poly(vinyl chloride) (PVC) plastic from mixed plastic wastes (MPWs) by froth flotation. Flotation behavior of single plastic indicates that PVC can be separated from poly(ethylene terephthalate) (PET), poly(acrylonitrile-co-butadiene-co-styrene) (ABS), polystyrene (PS), polycarbonate (PC) and poly(methyl methacrylate) (PMMA) by froth flotation combined with CHC treatment. Mechanism of CHC treatment was examined by contact angle measurement, scanning electron microscopy, Fourier transform infrared and X-ray photoelectron spectroscopy...
August 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28764859/modeling-3d-csia-data-carbon-chlorine-and-hydrogen-isotope-fractionation-during-reductive-dechlorination-of-tce-to-ethene
#7
Boris M Van Breukelen, Heloïse A A Thouement, Philip E Stack, Mindy Vanderford, Paul Philp, Tomasz Kuder
Reactive transport modeling of multi-element, compound-specific isotope analysis (CSIA) data has great potential to quantify sequential microbial reductive dechlorination (SRD) and alternative pathways such as oxidation, in support of remediation of chlorinated solvents in groundwater. As a key step towards this goal, a model was developed that simulates simultaneous carbon, chlorine, and hydrogen isotope fractionation during SRD of trichloroethene, via cis-1,2-dichloroethene (and trans-DCE as minor pathway), and vinyl chloride to ethene, following Monod kinetics...
July 17, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28762276/synthesis-of-aryl-c-glycosides-via-iron-catalyzed-cross-coupling-of-halosugars-stereoselective-anomeric-arylation-of-glycosyl-radicals
#8
Laksmikanta Adak, Shintaro Kawamura, Gabriel Toma, Toshio Takenaka, Katsuhiro Isozaki, Hikaru Takaya, Akihiro Orita, Ho C Li, Tony K M Shing, Masaharu Nakamura
We have developed a novel diastereoselective iron-catalyzed cross-coupling reaction of various glycosyl halides with aryl metal reagents for the efficient synthesis of aryl C-glycosides, which are of significant pharmaceutical interest due to their biological activities and resistance toward metabolic degradation. A variety of aryl, heteroaryl, and vinyl metal reagents can be cross-coupled with glycosyl halides in high yields in the presence of a well-defined iron complex, composed of iron(II) chloride and a bulky bisphosphine ligand, TMS-SciOPP...
August 1, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28749179/analysis-of-microrna-expression-and-micronuclei-frequency-in-workers-exposed-to-vinyl-chloride-monomer-in-china
#9
Nan-Nan Feng, Yan Fang, Ya-Nan Zhang, Xiao-Wen Xu, Yong Li, Jin-Wei Wang, Yong-Liang Li, Paul Brandt-Rauf, Zhao-Lin Xia
AIM: To identify differently expressed miRNAs associated with vinyl chloride monomer (VCM) and micronuclei (MN) frequency. METHOD: In discovery stage, we used microarray to detect miRNAs expression in peripheral blood lymphocytes between six low and six high VCM-exposed workers grouped by medium cumulative exposure dose. Then we validated four miRNAs using real-time quantitative reverse transcription PCR (qRT-PCR) and detected the micronuclei frequencies using cytokinesis-block micronucleus assay in 94 VCM-exposed workers and 53 healthy control subjects...
July 27, 2017: Epigenomics
https://www.readbyqxmd.com/read/28745774/the-role-of-kcl-in-fecl3-kcl-al2o3-catalysts-with-enhanced-catalytic-performance-for-ethane-oxychlorination
#10
Qihua Zhou, Ruisheng Hu, Yun Jia, Hongye Wang
Among the vinyl chloride production processes, ethane oxychlorination is the most economical and environment-friendly process but constrained by the lack of high performance catalysts for industrial applications. In this work, FeCl3-KCl/Al2O3 catalysts with different molar ratios of K/Fe were prepared by a co-impregnation method and applied to ethane oxychlorination. The FeCl3-KCl/Al2O3 catalyst with K/Fe = 2 exhibited enhanced catalytic performance with the highest conversion of C2H6 (99.1%) and the best selectivity to C2H3Cl (74%) under the optimal conditions of 400 °C, C2H6 : HCl : air = 1 : 3 : 5...
July 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28743073/in-situ-biodegradation-potential-of-1-2-dca-and-vc-at-sites-with-different-hydrogeological-settings
#11
R C M Nobre, M M M Nobre, T M P Campos, D Ogles
This paper investigates the feasibility of applying in-situ Bioremediation (ISB) to three sites contaminated with vinyl chloride and/or chlorinated alkanes such as 1,2-DCA and 1,1,2-TCA, presenting distinct hydrogeological settings and history of contaminant loading. Biotransformation of these compounds is well established in laboratory studies and pure cultures. Due to confidential aspects, however, few field data are available to support real case studies to the predictability of their fate and lifetime in soil and groundwater...
July 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28738227/rapid-and-reliable-determination-of-p-nitroaniline-in-wastewater-by-molecularly-imprinted-fluorescent-polymeric-ionic-liquid-microspheres
#12
Xing Lu, Yiwen Yang, Yanbo Zeng, Lei Li, Xiaohua Wu
Rapid and efficient detecting trace amount of environmental p-nitroaniline (p-NA) is in urgent need for security concerns and pollution supervision. In this work we report the use of molecularly imprinted polymeric ionic liquid (MIPIL) microspheres to construct recognizable surfaces for detection of p-NA through fluorescence quenching. The p-NA imprinted microspheres are synthesized by precipitation polymerization upon co-polymerization of 3-(anthracen-9-ylmethyl)-1-vinyl-1H-imidazol-3-ium chloride (Fluorescent IL monomer) with ethyleneglycol dimethacrylate (EGDMA)...
July 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28737929/enhanced-degradation-of-tce-on-a-superfund-site-using-endophyte-assisted-poplar-tree-phytoremediation
#13
Sharon L Doty, John L Freeman, Christopher M Cohu, Joel G Burken, Andrea Firrincieli, Andrew Simon, Zareen Khan, J G Isebrands, Joseph Lukas, Michael J Blaylock
Trichloroethylene (TCE) is a widespread environmental pollutant common in groundwater plumes associated with industrial manufacturing areas. We had previously isolated and characterized a natural bacterial endophyte, Enterobacter sp. strain PDN3, of poplar trees, that rapidly metabolizes TCE, releasing chloride ion. We now report findings from a successful three-year field trial of endophyte-assisted phytoremediation on the Middlefield-Ellis-Whisman Superfund Study Area TCE plume in the Silicon Valley of California...
August 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28732995/ultrasonic-assisted-fabrication-and-characterization-of-pvc-sio2-nanocomposites-having-bovine-serum-albumin-as-a-bio-coupling-agent
#14
Shadpour Mallakpour, Hossein Yazdan Nazari
In this work, SiO2 nanoparticles (NPs) were modified with bovine serum albumin (BSA) under ultrasound irradiations as a green and fast route to achieve their good dispersion. Subsequently, different weight percentages of the modified NPs (3, 6, and 9wt%) were incorporated in poly(vinyl chloride) (PVC) as the matrix. Thermogravimetric analysis of the SiO2-BSA NPs indicated that 12wt% of the modifier was loaded on the surface of SiO2 NPs. Encapsulation of the SiO2-BSA resulted in a meaningful improvement in the optical, mechanical and thermal characteristics of the prepared PVC nanocomposites (NCs)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732984/ultrasonic-assisted-biosurface-modification-of-multi-walled-carbon-nanotubes-with-thiamine-and-its-influence-on-the-properties-of-pvc-tm-mwcnts-nanocomposite-films
#15
Shadpour Mallakpour, Amir Abdolmaleki, Faezeh Azimi
The present paper represents a simple and efficient technique via ultrasonic irradiation, which utilized for chemical treatment of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) with Thiamine (Tm). Poly(vinyl chloride) (PVC) based nanocomposites (NC)s were prepared by the incorporation of various amounts of modified MWCNTs (4, 8, and 12wt%) within the PVC matrix by blending solution and ultrasonic distribution methods. The morphological, chemical structure and thermal stability of the PVC/Tm-MWCNT NCs were identified via Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, and thermogravimetric analysis...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28726345/enantioselective-construction-of-trifluoromethoxylated-stereogenic-centers-by-nickel-catalyzed-asymmetric-suzuki-miyaura-coupling-of-secondary-benzyl-bromides
#16
Weichen Huang, Xiaolong Wan, Qilong Shen
A method for the construction of trifluoromethoxy-containing stereogenic centers with high enantiometric excess via nickel-catalyzed Suzuki-Miyaura coupling of easily available -bromobenzyl trifluoromethylethers 1a-g with a variety of aryl pinacol boronates was described. The reaction conditions were mild and a variety of common functional groups such as fluoride, chloride, bromide, ester, enolizable ketone, nitro, cyano, amino and vinyl group were well tolerated. Furthermore, the reaction can be easily scaled up to gram quantities without erosion of the enantioselectivity...
July 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28716488/simultaneous-anaerobic-transformation-of-carbon-tetrachloride-to-carbon-dioxide-and-tetrachloroethene-to-ethene-in-a-continuous-flow-column
#17
Mohammad F Azizian, Lewis Semprini
The simultaneous anaerobic transformation of tetrachloroethene (PCE) and carbon tetrachloride (CT) was evaluated in a continuous flow column. The column was packed with quartz sand and bioaugmented with the Evanite culture (EV) that is capable of transforming PCE to ethene. Azizian and Semprini (2016) reported that PCE and CT could be simultaneously transformed in the column, with PCE (0.1mM) transformed mainly to ethene and CT (0.015mM) to chloroform (CF) (20%) and an unknown transformation product, likely carbon dioxide (CO2)...
July 6, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28715151/nickel-catalyzed-intermolecular-carbosulfonylation-of-alkynes-via-sulfonyl-radicals
#18
Andrés García-Domínguez, Simona Müller, Cristina Nevado
β,β-Disubstituted vinyl sulfones were obtained with complete regio- and stereocontrol in a multicomponent reaction involving alkynes, organoboronic acids, and sulfonyl chlorides in the presence of a nickel catalyst. The reaction proceeds via sulfonyl radicals generated in situ under mild reaction conditions.
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28700100/total-synthesis-of-n-methylwelwitindolinone%C3%A2-b-isothiocyanate
#19
Julius R Reyes, Jiasu Xu, Kenichi Kobayashi, Vikram Bhat, Viresh H Rawal
The asymmetric synthesis of (-)-N-methylwelwitindolinone B isothiocyanate is reported. Critical challenges overcome through these studies include the stereoselective installation of the sterically congested C13 alkyl chloride and control of the wayward reactivity of the indole unit to standard oxidants. A Pt-catalyzed hydrosilylation helped stymie unwanted rearrangements facilitated by vinyl group participation during the chloride installation step, and a new Fe(II) -catalyzed oxidation accomplished the problematic conversion of indole into 2-indolinone...
July 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28691817/the-microwave-spectrum-and-molecular-structure-of-z-1-chloro-2-fluoroethylene-acetylene-demonstrating-the-importance-of-the-balance-between-steric-and-electrostatic-interactions-in-heterodimer-formation
#20
Helen O Leung, Mark D Marshall, Nazir D Khan
The structure of the gas-phase heterodimer formed between (Z)-1-chloro-2-fluoroethylene and acetylene is determined via Fourier transform microwave spectroscopy from 5.5 to 20.8 GHz. In the first instance where in the presence of both a fluorine atom and a chlorine atom on the haloethylene the protic acid binds to the chlorine atom, the acetylene adopts a configuration similar to that in the analogous complex with vinyl chloride. Positioned in a manner to interact favorably with both the chlorine atom and the hydrogen atom geminal to it, the acetylene molecule is able to maximize the overall electrostatic stabilization even though other regions of the haloethylene offer individual sites of greater positive or negative electrostatic potential...
July 21, 2017: Journal of Physical Chemistry. A
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