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1. A facile access to cis-dihydrofurobenzofuran from 2-(2,5-dihydro-furan-2-yl)-phenol

Author:
Xiao-Hui Hu; Xiao-Qiu Pu; Rui Liu; Chun-Xiao Cui; Jun Yang; Xian-Jin Yang
Source:
RSC advances 2016 v.6 no.63 pp. 58613-58616
ISSN:
2046-2069
Subject:
acetonitrile; air; catalysts; catalytic activity; chemical bonding; oxidants; palladium; solvents
Abstract:
... A facile access to cis-dihydrofurobenzofuran from a Pd-catalyzed intramolecular oxidative C–O bond formation of 2-(2,5-dihydro-furan-2-yl)-phenol is reported. The combined use of Pd(OAc)₂ as catalyst, acetonitrile as solvent and AgOAc or air as oxidant affords cis-dihydrofurobenzofurans in good (up to 83%) yields. ...
DOI:
10.1039/c6ra06840e

2. A modular approach toward the synthesis of 2,4-disubstituted pyridines

Author:
Raju Singha; Shubhendu Dhara; Jayanta K. Ray
Source:
Tetrahedron letters 2013 v.54 no.36 pp. 4841-4843
ISSN:
0040-4039
Subject:
acetonitrile; air; aldehydes; ammonium chloride; chemical reactions; chemical structure; pyridines; solvents; synthesis; triethylamine
Abstract:
... A number of 2,4-disubstituted pyridines have been synthesized using α,β,γ,δ-unsaturated aldehydes and ammonium chloride in the presence of triethylamine in acetonitrile solvent at 80°C under air balloon. ...
DOI:
10.1016/j.tetlet.2013.06.092

3. A multicomponent palladium-catalyzed carbonylative approach to imidazopyridinyl-N,N-dialkylacetamides

Author:
Lucia Veltri; Patrizio Russo; Tommaso Prestia; Paola Vitale; Roberto Romeo; Bartolo Gabriele
Source:
Journal of catalysis 2020 v.386 pp. 53-59
ISSN:
0021-9517
Subject:
acetonitrile; air; catalytic activity; central nervous system; chemical bonding; gamma-aminobutyric acid; heterocyclic compounds; isomerization; oxidants; oxygen; palladium; secondary amines; solvents
Abstract:
... A novel, multicomponent approach to 2-(imidazo[1,2-a]pyridin-3-yl)-N,N-dialkylacetamides (very important class of fused heterocyclic derivatives, known to act on central nervous system by enhancing the activity of the GABA) is reported. It is based on the carbonylation reaction of N-Boc-(prop-2-yn-1-yl)pyridin-2-amines carried out in the presence of secondary amines (2–3 equiv) under oxidative con ...
DOI:
10.1016/j.jcat.2020.03.026

4. A simple QuEChERS-like extraction approach for molecular chemical characterization of organic aerosols: application to nitrated and oxygenated PAH derivatives (NPAH and OPAH) quantified by GC–NICIMS

Author:
A. Albinet; F. Nalin; S. Tomaz; J. Beaumont; F. Lestremau
Source:
Analytical and bioanalytical chemistry 2014 v.406 no.13 pp. 3131-3148
ISSN:
1618-2642
Subject:
Lampris guttatus; acetonitrile; aerosols; agitation; air; mixing; particulates; photooxidation; solid phase extraction; solvents; temperature
Abstract:
... An extraction procedure based on the Quick Easy Cheap Effective Rugged and Safe (QuEChERS) approach has been developed and used for analysis of particle-bound nitrated and oxygenated PAH derivatives (NPAH and OPAH, respectively). Several analytical conditions, for example GC injection temperature and MS detection settings, were optimized. This analytical procedure enabled simultaneous GC–NICIMS qu ...
DOI:
10.1007/s00216-014-7760-5

5. Analysis of phthalic, isophthalic and long-chain (C₄–C₁₂) dicarboxylic acids in atmospheric aerosols by UPLC/ESI/ToF-MS

Author:
Giovanni Mirivel; Véronique Riffault; Jean-Claude Galloo
Source:
Analytical methods 2011 v.3 no.5 pp. 1172-1179
ISSN:
1759-9679
Subject:
acetonitrile; aerosols; air; dicarboxylic acids; experimental design; filters; formic acid; ionization; liquids; mass spectrometry; methanol; solvents; ultra-performance liquid chromatography
Abstract:
... A new analytical method for the simultaneous determination of phthalic, isophthalic and 14 long-chain dicarboxylic acids in ambient aerosols by ultra-performance liquid chromatography/time-of-flight mass spectrometry with negative-ion electrospray ionization was developed and validated. A fast and quantitative pressurized fluid extraction procedure with water as solvent was optimized using samplin ...
DOI:
10.1039/c0ay00677g

6. Assessment of estrogenic activity in PM10 air samples with the ERE-CALUX bioassay: Method optimization and implementation at an urban location in Flanders (Belgium)

Author:
Kim Croes; Pieterjan Debaillie; Bo Van den Bril; Jeroen Staelens; Tara Vandermarken; Kersten Van Langenhove; Michael S. Denison; Martine Leermakers; Marc Elskens
Source:
Chemosphere 2016 v.144 pp. 392-398
ISSN:
0045-6535
Subject:
acetone; acetonitrile; air; animal ovaries; bioassays; carbon; cytotoxicity; endocrine-disrupting chemicals; estradiol; estrogenic properties; ethanol; glass fibers; heavy metals; hexane; humans; ovarian neoplasms; solvents; system optimization; traffic; Belgium
Abstract:
... Endocrine disrupting chemicals represent a broad class of compounds, are widespread in the environment and can pose severe health effects. The objective of this study was to investigate the overall estrogen activating potential of PM10 air samples at an urban location with high traffic incidence in Flanders, using a human in vitro cell bioassay.PM10 samples (n = 36) were collected on glass fiber f ...
DOI:
10.1016/j.chemosphere.2015.09.020

7. Barrier properties of anti-gas military garments, considering exposure to gas organic compounds

Author:
Pavel Otrisal; Karel Friess; Martin Urban; Simona Bungau; Delia Mirela Tit; Danut-Eugeniu Mosteanu; Zdenek Melicharik; Constantin Bungau; Lotfi Aleya
Source:
Science of the total environment 2020 v.714 pp. 136819
ISSN:
0048-9697
Subject:
acetonitrile; air; clothing; iso-octanes; permeability; permeameters; pollutants; polymers; solvents; toxic substances; vapors
Abstract:
... The problems of determining the protective properties of barrier materials used for the production of body surface protection products of an isolative type are very actual. These garments are expected to have long-term resistance against permeation of toxic substances. The paper deals with the study of the effect of organic solvent vapours on the changes in protective properties of selected anti-g ...
DOI:
10.1016/j.scitotenv.2020.136819

8. Base-Free Direct Synthesis of Alkynylphosphonates from Alkynes and H-Phosphonates Catalyzed by Cu2O

Author:
Moglie Yanina; Mascaró Evangelina; Gutierrez Victoria; Alonso Francisco; Radivoy Gabriel
Source:
Journal of organic chemistry 2016 v.81 no.5 pp. 1813-1818
ISSN:
1520-6904
Subject:
acetonitrile; additives; air; alkynes; cuprous oxide; ligands; moieties; organic chemistry; solvents
Abstract:
... A simple and mild methodology for the direct synthesis of alkynylphosphonates is presented. The reaction of a variety of terminal alkynes with dialkyl phosphites in the presence Cu₂O (14 mol %) led to the formation of the corresponding alkynylphosphonates in good to excellent yields. Reactions are performed under air, in acetonitrile as solvent, and in the absence of base or ligand additives. This ...
DOI:
10.1021/acs.joc.5b02528

9. Bioinspired aerobic oxidation of alcohols with a bifunctional ligand based on bipyridine and TEMPO

Author:
Lianyue Wang; Zhixing Bie; Sensen Shang; Ying Lv; Guosong Li; Jingyang Niu; Shuang Gao
Source:
RSC advances 2016 v.6 no.41 pp. 35008-35013
ISSN:
2046-2069
Subject:
acetonitrile; air; aldehydes; ambient temperature; catalysts; chemoselectivity; copper; free radicals; ketones; ligands; oxidation; solvents; ultraviolet-visible spectroscopy
Abstract:
... A novel bioinspired bifunctional ligand incorporating metal-binding site and stable free radical has been synthesized. The catalytic system obtained from the bifunctional ligand with copper(i) iodide in the presence of N-methylimidazole is highly efficient for the oxidation of a broad range of primary benzylic, allylic, alkynyl, aliphatic alcohols and secondary benzylic alcohols to the correspondi ...
DOI:
10.1039/c6ra05536b

10. Coupling ASE, sylilation and SPME–GC/MS for the analysis of current-used pesticides in atmosphere

Author:
Caroline Raeppel; Marie Fabritius; Marie Nief; Brice M.R. Appenzeller; Maurice Millet
Source:
Talanta 2014 v.121 pp. 24-29
ISSN:
0039-9140
Subject:
acetonitrile; acids; air; derivatization; desorption; filters; gas chromatography-mass spectrometry; glass fibers; ions; pesticides; sodium chloride; solid phase microextraction; solvents; spring; summer; traps; uncertainty; urea; France
Abstract:
... An analytical methodology using Accelerated Solvent Extraction (ASE) and a sylilation procedure coupled to Solid Phase Micro-Extraction (SPME) and GC/MS was developed for the determination of 31 pesticides of different chemical classes (urea, phenoxy acids, pyrethrenoïds, etc.) commonly used in non-agricultural areas in atmospheric samples. This methodology was developed to evaluate the outdoor at ...
DOI:
10.1016/j.talanta.2013.12.040

11. Design and preparation of a polymer resin-supported organoselenium catalyst with industrial potential

Author:
Yuguang Wang; Lihua Yu; Bingchun Zhu; Lei Yu
Source:
Journal of materials chemistry A 2016 v.4 no.28 pp. 10828-10833
ISSN:
2050-7496
Subject:
acetonitrile; air; catalysts; cyclohexenes; hydrogen peroxide; oxidation; polymers; resins; selenium; solvents
Abstract:
... Hexavalent Se? Yes! Selenium on polymers exhibits quite different properties compared to that in small molecules. Hexavalent Se, rare in organoselenium chemistry, was found to be the major species on polymers. The high-valent Se species on recyclable polymer resins could quickly catalyze the oxidation reaction of cyclohexene with H₂O₂ in water to produce industrially important intermediate trans-1 ...
DOI:
10.1039/c6ta02566h

12. Determination of six veterinary pharmaceuticals in egg by liquid chromatography: Chemometric optimization of a novel air assisted-dispersive liquid-liquid microextraction by solid floating organic drop

Author:
Carla M. Teglia; Lucia Gonzalo; María J. Culzoni; Héctor C. Goicoechea
Source:
Food chemistry 2019 v.273 pp. 194-202
ISSN:
0308-8146
Subject:
acetonitrile; air; albendazole; chemometrics; chloramphenicol; eggs; enrofloxacin; liquid chromatography; liquid-phase microextraction; methanol; methylene chloride; nicarbazin; pH; sodium phosphate; solidification; solvents; trimethoprim; veterinary drugs; zinc sulfate
Abstract:
... Two extraction strategies for albendazole, chloramphenicol, trimethoprim, enrofloxacin, oxitetracycline and nicarbazin in egg were optimized for its quantitation by liquid chromatography. First, two designs were built to find out the optimized condition for the air assisted-dispersive liquid-liquid microextraction based on solidification of organic drop: a fractional factorial and a central compos ...
DOI:
10.1016/j.foodchem.2017.08.034

13. Dispersed-Nanoparticle Loading Synthesis for Monodisperse Au-Titania Composite Particles and Their Crystallization for Highly Active UV and Visible Photocatalysts

Author:
Sakamoto Takeshi; Nagao Daisuke; Noba Masahiro; Ishii Haruyuki; Konno Mikio
Source:
Langmuir 2014 v.30 no.24 pp. 7244-7250
ISSN:
1520-5827
Subject:
acetonitrile; air; crystallization; ethanol; gold; hot water treatment; irradiation; nanogold; photocatalysis; photocatalysts; solvents; titanium dioxide; ultraviolet radiation
Abstract:
... Submicrometer-sized amorphous titania spheres incorporating Au nanoparticles (NPs) were prepared in a one-pot synthesis consisting of a sol–gel reaction of titanium(IV) isopropoxide in the presence of chloroauric acid and a successive reduction with sodium borohydride in a mixed solvent of ethanol/acetonitrile. The synthesis was allowed to prepare monodisperse titania spheres that homogeneously in ...
DOI:
10.1021/la5012499

14. Divergent Reactivity in Cuᴵᴵ-Catalyzed Oxidative Coupling between Indole/Tryptamine Derivatives and β-Arylacrylic Acids

Author:
Wei Cao; Jinbao Fan; Linyang Yan; Guangyao Zeng; Jinjin Ma; Yajing Wang; Yingjun Zhou; Xu Deng
Source:
Organic letters 2019 v.21 no.23 pp. 9506-9511
ISSN:
1523-7052
Subject:
acetonitrile; acids; air; catalytic activity; chemical structure; copper; cyclization reactions; oxidants; solvents; tryptamine
Abstract:
... Condition-controlled divergent oxidative coupling reactions between indole/tryptamine derivatives and β-arylacrylic acids with the catalysis of copper(II) have been developed. Specifically, a formal Michael addition/dehydration sequence between indoles and β-arylacrylic acids occurred in the presence of catalytic CuBr₂ in CH₃CN under air, thus affording highly functionalized 2,3-dihydro-1H-pyrrolo ...
DOI:
10.1021/acs.orglett.9b03697

15. Effect of application solvents on heterotrophic and nitrifying populations in soil microcosms

Author:
Miller, J.L.; Sardo, M.A.; Thompson, T.L.; Miller, R.M.
Source:
Environmental toxicology and chemistry 1997 v.16 no.3 pp. 447-451
ISSN:
0730-7268
Subject:
acetonitrile; air; ammonia; carbon; fuels; groundwater; methanol; methylene chloride; mineralization; naphthalene; nitrification; nitrogen fertilizers; pesticides; soil; soil ecology; soil pollution; solvents
Abstract:
... Agricultural practices may cause contamination of soil and ground water with a combination of organic compounds (pesticides and fuel) and nitrogen fertilizers. In coupled microcosm studies that monitored the mineralization of naphthalene and the nitrification of ammonia, it was observed that the solvent (dichloromethane) used to apply naphthalene to the soil inhibited nitrification, although there ...
DOI:
10.1897/1551-5028(1997)016<0447:EOASOH>2.3.CO;2

16. Epoxidation of styrene over Fe(Cr)-MIL-101 metal–organic frameworks

Author:
Jian Sun; Guangli Yu; Qisheng Huo; Qiubin Kan; Jingqi Guan
Source:
RSC advances 2014 v.4 no.72 pp. 38048-38054
ISSN:
2046-2069
Subject:
acetonitrile; air; catalysts; catalytic activity; coordination polymers; epoxidation reactions; hydrogen peroxide; iron; metal ions; oxidants; solvents; styrene
Abstract:
... Epoxidation of styrene is one of the key reactions in organic synthesis. In this paper, we investigated the effect of different metal ions in MIL-101 metal–organic framework on styrene epoxidation using various oxidants such as air, H₂O₂ and TBHP. For the aerobic epoxidation of styrene, Fe-MIL-101 and Cr-MIL-101 presented good styrene conversion (87.2 vs. 65.5%) and epoxide selectivity (54.4% vs. ...
DOI:
10.1039/c4ra05402d

17. Humidity-robust scalable metal halide perovskite film deposition for photovoltaic applications

Author:
Carlo Andrea Riccardo Perini; Anil Reddy Pininti; Samuele Martani; Peter Topolovsek; Andrea Perego; Daniele Cortecchia; Annamaria Petrozza; Mario Caironi
Source:
Journal of materials chemistry A 2020 v.8 no.47 pp. 25283-25289
ISSN:
2050-7496
Subject:
acetonitrile; air; industrial applications; lead; methylamine; relative humidity; silicon; solar cells; solar energy; solvents
Abstract:
... Organic–inorganic perovskite photovoltaics have now achieved power conversion efficiencies at par with silicon devices on a lab-scale. To enable industrial application of the technology, developing a perovskite deposition route compatible with scalable, large-area deposition methods, which exploits safer processing solvents and is robust to variations of the processing parameters, particularly hum ...
DOI:
10.1039/d0ta05003b

18. Liquid-phase hydrodechlorination of trichloroethylene driven by nascent H2 under an open system: Hydrogenation activity, solvent effect and sulfur poisoning

Author:
Weilai Wang; Fan Zhang; Yunfei Zhang; Lei Xu; Yuansheng Pei; Junfeng Niu
Source:
Journal of environmental sciences (China) 2021 v.108 pp. 96-106
ISSN:
1001-0742
Subject:
acetonitrile; air; catalysts; cathodes; dechlorination; hydrogen; hydrogenation; remediation; solvents; sulfur; surface water; trichloroethylene; China
Abstract:
... Hydrodechlorination is a promising technology for the remediation of water body contaminated with trichloroethylene (TCE). In this work, the liquid-phase hydrogenation of TCE by Raney Ni (R-Ni) and Pd/C under an open system have been studied, in which nascent H₂ (Nas-H₂) generated in situ from the cathode acted as a hydrogen source. Experimental results showed that TCE was completely eliminate fro ...
DOI:
10.1016/j.jes.2021.02.015

19. Modular Construction of Photoanodes with Covalently Bonded Ru- and Ir-Polypyridyl Visible Light Chromophores

Author:
Chao Wang; Mona Amiri; Riley T. Endean; Octavio Martinez Perez; Samuel Varley; Ben Rennie; Loorthuraja Rasu; Steven H. Bergens
Source:
ACS applied materials & interfaces 2018 v.10 no.29 pp. 24533-24542
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; acetonitrile; air; atomic absorption spectrometry; chemical bonding; hydroquinone; indium tin oxide; ligands; methylene chloride; nanoparticles; oxidation; semiconductors; solvents; sulfuric acid; titanium dioxide; triethylamine; ultraviolet-visible spectroscopy
Abstract:
... 1,10-phenanthroline is grafted to indium tin oxide (ITO) and titanium dioxide nanoparticle (TiO₂) semiconductors by electroreduction of 5-diazo-1,10-phenanthroline in 0.1 M H₂SO₄. The lower and upper potential limits (−0.20 and 0.15 VSCE, respectively) were set to avoid reduction and oxidation of the 1,10-phenanthroline (phen) covalently grafted at C5 to the semiconductor. The resulting semiconduc ...
DOI:
10.1021/acsami.8b06605

20. Molecular Characterization of Organosulfates in Organic Aerosols from Shanghai and Los Angeles Urban Areas by Nanospray-Desorption Electrospray Ionization High-Resolution Mass Spectrometry

Author:
Tao Shikang; Lu Xiaohui; Levac Nicole; Bateman Adam P.; Nguyen Tran B.; Bones David L.; Nizkorodov Sergey A.; Laskin Julia; Laskin Alexander; Yang Xin
Source:
Environmental Science & Technology 2014 v.48 no.18 pp. 10993-11001
ISSN:
1520-5851
Subject:
acetonitrile; aerosols; air; alkanes; electrospray ionization mass spectrometry; emissions; esterification; hygroscopicity; ionization; molecular weight; nitrogen; non-polar compounds; organic sulfur compounds; solvents; sulfates; sulfuric acid; surface tension; surfactants; toluene; urban areas; California; China
Abstract:
... Fine aerosol particles in the urban areas of Shanghai and Los Angeles were collected on days that were characterized by their stagnant air and high organic aerosol concentrations. They were analyzed by nanospray-desorption electrospray ionization mass spectrometry with high mass resolution (m/Δm = 100,000). Solvent mixtures of acetonitrile and water and acetonitrile and toluene were used to extrac ...
DOI:
10.1021/es5024674

21. Molybdenum hexacarbonyl: air stable catalyst for microwave assisted intermolecular [2+2+2] co-trimerization involving propargyl halides

Author:
Sambasivarao Kotha; Gaddamedi Sreevani
Source:
Tetrahedron letters 2015 v.56 no.43 pp. 5903-5908
ISSN:
0040-4039
Subject:
acetonitrile; air; catalysts; chemical structure; cycloaddition reactions; halides; microwave radiation; microwave treatment; molybdenum; organic halogen compounds; solvents
Abstract:
... Intermolecular [2+2+2] cycloaddition of propargyl halides with 1,6-diynes was achieved with air stable, catalytic amount of Mo(CO)6 and the benzyl halide derivatives were isolated in good yields. The reaction conditions were optimized and better yields were observed under microwave irradiation conditions using acetonitrile as a solvent. ...
DOI:
10.1016/j.tetlet.2015.09.029

22. New electroactive and electrochromic aromatic polyamides with ether‐linked bis(triphenylamine) units

Author:
Sheng‐Huei Hsiao; Shou‐Lun Cheng
Source:
Journal of polymer science 2015 v.53 no.3 pp. 496-510
ISSN:
0887-624X
Subject:
acetonitrile; air; color; dicarboxylic acids; electrochemistry; electrolytes; glass; glass transition; nitrogen; oxidation; oxidative stability; phosphorylation; polyamides; silver chloride; solubility; solvents; temperature; weight loss
Abstract:
... A new class of electroactive polyamides with ether‐linked bis(triphenylamine) [O(TPA)₂] units were prepared through the direct phosphorylation polycondensation from N,N‐di(4‐aminophenyl)‐N′,N′‐diphenyl‐4,4′‐oxydianiline and aromatic dicarboxylic acids. These polyamides were amorphous with good solubility in many organic solvents, such as NMP and DMAc, and could be solution‐cast into strong and fle ...
DOI:
10.1002/pola.27465

23. Organosulfates and oxidation products from biogenic hydrocarbons in fine aerosols from a forest in North West Europe during spring

Author:
Kasper Kristensen; Marianne Glasius
Source:
Atmospheric environment 2011 v.45 no.27 pp. 4546-4556
ISSN:
1352-2310
Subject:
high performance liquid chromatography; volatile organic compounds; adipic acid; sulfonic acids; mass spectrometry; forests; detection limit; atmospheric chemistry; aerosols; camphor; air; oxidation; conifers; isoprene; acetonitrile; filters; methanol; quartz; spring; solvents; air pollution; Denmark
Abstract:
... Organosulfates of monoterpenes and isoprene, as well as their oxidation products have been identified in biogenic secondary organic aerosols (BSOA) from both laboratory and field studies. Organosulfates provide an interesting coupling between air pollution and formation of low-volatility BSOA. HPLC quadrupole time-of-flight mass spectrometry was used to study polar acidic monoterpene and isoprene ...
DOI:
10.1016/j.atmosenv.2011.05.063

24. Oxone®-mediated direct arylselenylation of imidazo[2,1-b]thiazoles, imidazo[1,2-a]pyridines and 1H-pyrazoles

Author:
Ingrid Rodrigues; Angelita M. Barcellos; Andrei L. Belladona; Juliano A. Roehrs; Roberta Cargnelutti; Diego Alves; Gelson Perin; Ricardo F. Schumacher
Source:
Tetrahedron 2018 v.74 no.31 pp. 4242-4246
ISSN:
0040-4020
Subject:
acetonitrile; air; chemical reactions; chemical structure; energy transfer; irradiation; oxidants; pyridines; solvents; thiazoles
Abstract:
... Oxone mediated reaction of imidazo[2,1-b]thiazole, imidazo[1,2-a]pyridine and 1H-pyrazole derivatives with diaryl diselenides is presented here. The methodology represents an efficient and simple protocol for carrying out the selective synthesis of 5-arylselanyl-imidazo[2,1-b]thiazoles, 3-arylselanyl-imidazo[1,2-a]pyridines and 4-arylselanyl-1H-pyrazoles in high yields using a stable, nontoxic and ...
DOI:
10.1016/j.tet.2018.06.046

25. Practical Cu(OAc)2/TEMPO-catalyzed selective aerobic alcohol oxidation under ambient conditions in aqueous acetonitrile

Author:
Jian-An Jiang; Jia-Lei Du; Zhan-Guo Wang; Zhong-Nan Zhang; Xi Xu; Gan-Lin Zheng; Ya-Fei Ji
Source:
Tetrahedron letters 2014 v.55 pp. 1677-1681
ISSN:
0040-4039
Subject:
acetonitrile; air; alcohols; aldehydes; ambient temperature; catalysts; chemical structure; copper; ketones; oxidants; oxidation; solvents
Abstract:
... We reported a ligand- and additive-free Cu(OAc)2/TEMPO catalyst system that enables efficient and selective aerobic oxidation of a broad range of primary and secondary benzylic alcohols, primary and secondary 1-heteroaryl alcohols, cinnamyl alcohols, and aliphatic alcohols to the corresponding aldehydes and ketones. This ambient temperature oxidation protocol is of practical features like aqueous ...
DOI:
10.1016/j.tetlet.2013.09.050

26. Preparation and characterization of MTiX for the catalytic oxidation of cyclohexane

Author:
A. Bellifa; A. Choukchou-Braham; C. Kappenstein; L. Pirault-Roy
Source:
RSC advances 2014 v.4 no.43 pp. 22374-22379
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; Lewis acids; X-ray diffraction; acetic acid; acetonitrile; adsorption; air; catalysts; catalytic activity; chromium; crystal structure; cyclohexanes; energy-dispersive X-ray analysis; liquids; oxidants; oxidation; pyridines; sol-gel processing; solvents; surface area; titanium dioxide; vanadium
Abstract:
... MTiX (M = Cr and V) samples, with 0, 5, 10 and 20 atomic percent, were synthesised by a sol–gel method and calcined at 400 °C in air. The XRD analysis results indicated that the materials presented a crystalline structure with the presence of TiO₂ anatase forms. BET analysis showed that the surface area varied with the variation of metal content. EDX analysis showed a heterogeneous distribution of ...
DOI:
10.1039/c4ra02241f

27. Simultaneous analysis of organochlorine pesticides and polychlorinated biphenyls in air samples by using accelerated solvent extraction (ASE) and solid-phase micro-extraction (SPME) coupled to gas chromatography dual electron capture detection

Author:
Haifaa Mokbel; Enaam Jamal Al Dine; Ahmad Elmoll; Céline Liaud; Maurice Millet
Source:
Environmental science and pollution research international 2016 v.23 no.8 pp. 8053-8063
ISSN:
0944-1344
Subject:
acetonitrile; air; detection limit; detectors; electrons; gas chromatography; organochlorine pesticides; polychlorinated biphenyls; regression analysis; samplers; solid phase microextraction; solvents; temperature
Abstract:
... An analytical method associating accelerated solvent extraction (ASE) and solid-phase micro-extraction (SPME) in immersion mode combined with gas chromatography dual electrons capture detectors (SPME-GC-2ECD) has been developed and studied for the simultaneous determination of 19 organochlorine pesticides (OCPs) and 22 polychlorinated biphenyls (PCBs) in air samples (active and XAD-2 passive sampl ...
DOI:
10.1007/s11356-016-6072-z

28. Simultaneous biomonitoring of 15 organophosphate flame retardants metabolites in urine samples by solvent induced phase transition extraction coupled with ultra-performance liquid chromatography-tandem mass spectrometry

Author:
Liqin Hu; Yun Tao; Dan Luo; Jingwen Feng; Limei Wang; Meng Yu; Yaping Li; Adrian Covaci; Surong Mei
Source:
Chemosphere 2019 v.233 pp. 724-732
ISSN:
0045-6535
Subject:
acetonitrile; additives; air; aqueous solutions; biomarkers; construction materials; detection limit; dust; environmental monitoring; esters; flame retardants; humans; hydrophobicity; hydroxylation; metabolites; organophosphorus compounds; phase transition; phosphates; plasticizers; products and commodities; separation; soil; solvents; standard deviation; tandem mass spectrometry; ultra-performance liquid chromatography; urine
Abstract:
... Organophosphate flame retardants and plasticizers (OPFRs) are widely additives in consumer products and building materials. They are frequently detected in environmental media, including indoor air, water, soil, and dust. To provide a low-cost and multi-target tool for monitoring individual exposure to OPFRs, a high-throughput method for simultaneous detection of 15 urinary OFPR metabolites was es ...
DOI:
10.1016/j.chemosphere.2019.05.242