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1. Transition metal-free direct C[sbnd]H trifluoromethyltion of (hetero)arenes with Togni’s reagent

Author:
Chen, Xiaoyu; Ding, Licheng; Li, Linlin; Li, Jingya; Zou, Dapeng; Wu, Yangjie; Wu, Yusheng
Source:
Tetrahedron letters 2020 v.61 no.9 pp. 151538
ISSN:
0040-4039
Subject:
aromatic hydrocarbons,   etc   ; chemical reactions; moieties;     Show all 3 Subjects
Abstract:
... A new transition-metal-free direct CH trifluoromethylation reaction of (hetero)arenes with Togni’s reagent was developed. This transformation proceeded smoothly under mild conditions and exhibited good tolerance of many synthetically relevant functional groups. It provided an alternative approach for the synthesis of trifluoromethylated (hetero)arenes. ...
DOI:
10.1016/j.tetlet.2019.151538

2. A 3D sketch-based formulation to model salt bodies from seismic data

Author:
Motta, Suellen; Montenegro, Anselmo; Gattass, Marcelo; Roehl, Deane
Source:
Computers & geosciences 2020 pp. 104457
ISSN:
0098-3004
Subject:
hydrocarbons,   etc   ; computers; geometry; geophysics; topology;     Show all 5 Subjects
Abstract:
... Accurate delineation of geobodies is one of the major tasks of hydrocarbon exploration from three-dimensional seismic data. Salt bodies, in particular, are one of the toughest geobodies to model. Their natural process of formation leads to their complex geometry and topology. With the increasing size of acquisition data every year, traditional manual delineation methods become increasingly labor-i ...
DOI:
10.1016/j.cageo.2020.104457

3. Dating the funerary use of caves in Liguria (northwestern Italy) from the Neolithic to historic times: Results from a large-scale AMS campaign on human skeletal series

Author:
Sparacello, V.S.; Varalli, A.; Rossi, S.; Panelli, C.; Goude, G.; Palstra, S.W.L.; Conventi, M.; Del Lucchese, A.; Arobba, D.; De Pascale, A.; Zavattaro, M.; Garibaldi, P.; Rossi, G.; Molinari, I.; Maggi, R.; Moggi-Cecchi, J.; Starnini, E.; Biagi, P.; Dori, I.
Source:
Quaternary international 2020 v.536 pp. 30-44
ISSN:
1040-6182
Subject:
aromatic hydrocarbons,   etc   ; caves; humans; Italy;     Show all 4 Subjects
Abstract:
... The multidisciplinary research team of this new project aimed at the chronological, anthropological and funerary behavior characterization of the skeletal remains unearthed from various caves in western Liguria (northwestern Italy) between the mid-1800s and the 1990s. Most of the burials and scattered bone assemblages were excavated prior to the development of modern stratigraphic methods, or come ...
DOI:
10.1016/j.quaint.2019.11.034

4. Study on flame structure and extinction mechanism of dimethyl ether spherical diffusion flames

Author:
Kang, Yinhu; Wang, Qiang; Zhang, Pengyuan; Liu, Congcong; Lu, Xiaofeng; Wang, Quanhai
Source:
Energy 2020 v.193 pp. 116786
ISSN:
0360-5442
Subject:
hydrocarbons,   etc   ; combustion; fire safety; flammability; models; oxygen;     Show all 6 Subjects
Abstract:
... Flame extinction which belongs to one of the most important limit combustion phenomena plays a vital role in the combustion safety, efficiency, and stability, and additionally, it is also important for fire safety research. Hence studies on the flame extinction mechanism is of fundamental and practical significances in the combustion science. In this paper, the structure dynamics and extinction me ...
DOI:
10.1016/j.energy.2019.116786

5. A review of electrokinetically enhanced bioremediation technologies for PHs

Author:
Saini, Anish; Bekele, Dawit Nega; Chadalavada, Sreenivasulu; Fang, Cheng; Naidu, Ravi
Source:
Journal of environmental sciences (China) 2020 v.88 pp. 31-45
ISSN:
1001-0742
Subject:
hydrocarbons,   etc   ; bioremediation; groundwater; petroleum; soil; surfactants; technology;     Show all 7 Subjects
Abstract:
... Since the early 1980’s there have been several different strategies designed and applied to the remediation of subsurface environment including physical, chemical and biological approaches. They have had varying degrees of success in remediating contaminants from subsurface soils and groundwater. The objective of this review is to examine the range of technologies for the remediation of contaminan ...
DOI:
10.1016/j.jes.2019.08.010

6. Impact of recovery correction or subjecting calibrators to sample preparation on measurement uncertainty: PAH determinations in waters

Author:
Mateos, Rocío; Oliveira, Cristina M.; Díez-Pascual, Ana María; Vera-López, Soledad; San Andrés, María Paz; da Silva, Ricardo J.N. Bettencourt
Source:
Talanta 2020 v.207
ISSN:
0039-9140
Subject:
polycyclic aromatic hydrocarbons,   etc   ; chemical species; uncertainty;     Show all 3 Subjects
Abstract:
... The decision on the fitness of a measurement for its intended use and the interpretation of an analytical result requires the assessment of the measurement uncertainty. Frequently, the determination of analytes in complex matrices involves demanding sample preparations in which analyte losses are observed. These losses should be considered when reporting the results, which can be corrected for low ...
DOI:
10.1016/j.talanta.2019.120274

7. Bis(stibahousene)

Author:
Lee, Vladimir Ya.; Ota, Kei; Ito, Yuki; Gapurenko, Olga A.; Sekiguchi, Akira; Minyaev, Ruslan M.; Minkin, Vladimir I.; Gornitzka, Heinz
Source:
Journal of the American Chemical Society 2017 v.139 no.39 pp. 13897-13902
ISSN:
1520-5126
Subject:
hydrocarbons
Abstract:
... Strained hydrocarbons constitute one of the most prominent classes of organic compounds. Among them, bicyclo[2.1.0]pentene (“housene”) derivatives represent a highly challenging and very attractive class. Although organic housenes have been known for more than five decades, there are still very few of them containing heavier main group elements. In this paper, we report on the two housene-type str ...
DOI:
10.1021/jacs.7b07712

8. Efficient transformation of electron-rich arenes into diethyl 3-arylisoxazole-4,5-dicarboxylates

Author:
Nakano, Ryuhta; Togo, Hideo
Source:
Tetrahedron 2020 v.76 no.24 pp. 131255
ISSN:
0040-4020
Subject:
aromatic hydrocarbons,   etc   ; alkynes; chemical reactions; chemical structure; hydroxylamine;     Show all 5 Subjects
Abstract:
... Treatment of electron-rich arenes with Tf₂O and DMF, followed by the reaction with NH₂OH·HCl and then with Oxone® in the presence of diethyl acetylenedicarboxylate generated diethyl 3-arylisoxazole-4,5-dicarboxylates in good to moderate yields. Other alkynes could be also used for the present one-pot transformation of arenes into 3-arylisoxazole derivatives. Click here and insert your abstract tex ...
DOI:
10.1016/j.tet.2020.131255

9. Oxidation of Electron-Rich Arenes Using HFIP-UHP System

Author:
Llopis, Natalia; Baeza, Alejandro
Source:
Journal of organic chemistry 2020 v.85 no.9 pp. 6159-6164
ISSN:
1520-6904
Subject:
aromatic hydrocarbons,   etc   ; chemical structure; hydroxylation; naphthols; organic chemistry; oxidation; quinones;     Show all 7 Subjects
Abstract:
... The straightforward oxidation of electron-rich arenes, namely, phenols, naphthols, and anisole derivatives, under mild reaction conditions, is described by means of the use of an environmentally benign HFIP-UHP system. The corresponding quinones or hydroxylated arenes were obtained in moderate to good yields. ...
DOI:
10.1021/acs.joc.0c00218

10. Sodium-Ion Storage Mechanism in Triquinoxalinylene and a Strategy for Improving Electrode Stability

Author:
Zhao, Qinglan; Zhao, Wei; Zhang, Cheng; Wu, Yilan; Yuan, Qinghong; Whittaker, Andrew K.; Zhao, X. S.
Source:
Energy & fuels 2020 v.34 no.4 pp. 5099-5105
ISSN:
1520-5029
Subject:
polycyclic aromatic hydrocarbons,   etc   ; electrodes; heterocyclic nitrogen compounds; lithium batteries;     Show all 4 Subjects
Abstract:
... Sodium-ion batteries are a promising alternative to lithium-ion batteries. In particular, organic sodium-ion batteries employing environmentally friendly organic materials as electrodes are gaining increasing research interest for developing secondary batteries as a result of the ease of processing, low cost, and flexibility of the organic electrode materials. Triquinoxalinylene (TQA) is a very pr ...
DOI:
10.1021/acs.energyfuels.0c00798

11. Oxidative umpolung selenocyanation of ketones and arenes: An efficient protocol to the synthesis of selenocyanates

Author:
Cui, Jianguo; Wei, Meizhen; Pang, Liping; Xiao, JunAn; Gan, Chunfang; Guo, Jiali; Xie, Chuanfang; Zhu, Qiming; Huang, Yanmin
Source:
Tetrahedron 2020 v.76 no.10 pp. 130978
ISSN:
0040-4020
Subject:
aromatic hydrocarbons,   etc   ; Lewis acids; chemical reactions; chemical structure; ketones; nitrogen;     Show all 6 Subjects
Abstract:
... A practical method for the umpolung selenocyanation of aryl ketones, alkyl ketones, β-ketoesters and electron-rich arenes has been developed, affording various selenocyanates in moderate to excellent yields. This transformation proceeds by an oxidative umpolung selenocyanation through nitrogen oxides-mediated electrophilic selenocyanation process. This method is simpler, more efficient, and less c ...
DOI:
10.1016/j.tet.2020.130978

12. One-Step Synthesis of C₂ᵥ-Symmetric Resorcin[4]arene Tetraethers

Author:
Smith, Jordan N.; Brind, Thomasin K.; Petrie, Simon B.; Grant, Mikaela S.; Lucas, Nigel T.
Source:
Journal of organic chemistry 2020 v.85 no.6 pp. 4574-4580
ISSN:
1520-6904
Subject:
aromatic hydrocarbons,   etc   ; aldehydes; bromine; chlorine; isomers; macrocyclization reactions; regioselectivity; resorcinol;     Show all 8 Subjects
Abstract:
... The three-component reaction between a resorcinol, 1,3-dimethoxybenzene, and an alkyl aldehyde (R = C₁–C₁₁) along with BF₃·OEt₂ affords a C₂ᵥ-symmetric resorcin[4]arene tetraether in one step; in most cases, the single isomer can be precipitated from the reaction mixture in moderate to excellent yields (up to 89%). The reaction is tolerant of 2-substituted resorcinols (R′ = OH, Cl, Br, Me), allowi ...
DOI:
10.1021/acs.joc.0c00128

13. Gas/particle partitioning of PAHs based on equilibrium-state model and steady-state model

Author:
Ma, Wan-Li; Zhu, Fu-Jie; Hu, Peng-Tuan; Qiao, Li-Na; Li, Yi-Fan
Source:
The Science of the total environment 2020 v.706 pp. 136029
ISSN:
0048-9697
Subject:
polycyclic aromatic hydrocarbons,   etc   ; cities; databases; environmental fate; monitoring; prediction;     Show all 6 Subjects
Abstract:
... The gas/particle (G/P) partitioning (KP) behavior is an important factor for the environmental fate of PAHs in atmosphere. Based on large database of log KP, equilibrium-state and steady-state models were applied for the comprehensive study with the G/P partitioning of PAHs, including the Harner-Bidleman (H-B) model, the Dachs-Eisenreich (D-E) model, and the Li-Ma-Yang (L-M-Y) model. For different ...
DOI:
10.1016/j.scitotenv.2019.136029

14. Spinel-Structured Ternary Ferrites as Effective Agents for Chemical Looping CO₂ Splitting

Author:
Ma, Li; Qiu, Yu; Li, Min; Cui, Dongxu; Zhang, Shuai; Zeng, Dewang; Xiao, Rui
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.15 pp. 6924-6930
ISSN:
1520-5045
Subject:
hydrocarbons,   etc   ; carbon dioxide; carbon monoxide; cobalt; manganese; oxygen; temperature;     Show all 7 Subjects
Abstract:
... Reverse water gas shift on the basis of chemical looping technology provides a viable method for efficiently converting CO₂ to CO for hydrocarbons at moderate temperature (<750 °C). However, the commonly available oxygen carrier materials are insufficiently active because of the degrading effect at relatively low temperatures. In this paper, we present several Co, Mn codoped ferrites in search of ...
DOI:
10.1021/acs.iecr.9b06799

15. Biofunctionalized nanomaterials for in situ clean-up of hydrocarbon contamination: A quantum jump in global bioremediation research

Author:
Basak, Geetanjali; Hazra, Chinmay; Sen, Ramkrishna
Source:
Journal of environmental management 2020 v.256 pp. 109913
ISSN:
0301-4797
Subject:
polycyclic aromatic hydrocarbons,   etc   ; biochemical compounds; bioremediation; nanoparticles; pollutants; toxicity;     Show all 6 Subjects
Abstract:
... Interfacing organic or inorganic nanoparticles with biological entities or molecules or systems with the aim of developing functionalized nano-scale materials or composites for remediation of persistent organic hydrocarbon pollutants (such as monocyclic and polycyclic aromatic hydrocarbons, MAH/PAH) has generated great interest and continues to grow almost unabated. However, the usefulness and pot ...
DOI:
10.1016/j.jenvman.2019.109913

16. Correction to: Urinary metabolites of polycyclic aromatic hydrocarbons in pregnant women and their association with a biomarker of oxidative stress

Author:
Lou, Xiang-Ying; Wu, Peng-Ran; Guo, Ying
Source:
Environmental science and pollution research international 2020 v.27 no.4 pp. 4551
ISSN:
0944-1344
Subject:
polycyclic aromatic hydrocarbons,   etc   ; biomarkers; metabolites; oxidative stress; pregnant women;     Show all 5 Subjects
Abstract:
... The correct name of the 1ˢᵗ Author is shown in this paper. ...
DOI:
10.1007/s11356-019-06977-z

17. Fulleropillar[4]arene: The Synthesis and Complexation Properties

Author:
Mi, Yan; Yao, Jiabin; Ma, Jingyu; Dai, Ling; Xiao, Chao; Wu, Wanhua; Yang, Cheng
Source:
Organic letters 2020 v.22 no.6 pp. 2118-2123
ISSN:
1523-7052
Subject:
aromatic hydrocarbons,   etc   ; chemical reactions; fullerene; positional isomers; quinones;     Show all 5 Subjects
Abstract:
... A multihydroquinone ether dialdehyde derivative 2 was incidentally obtained through an unexpected ring opening of pillar[4]arene[1]quinone 1. And the Prato reaction of 2 with [60]fullerene led to [60]fullerene bisadducts, from which trans-4 cyclic regioisomer 3 was isolated and characterized. The fulleropillar[4]arene 3 showed a larger cavity and can accommodate a viologen derivative C₁₂V²⁺ with a ...
DOI:
10.1021/acs.orglett.9b04607

18. Impact of changing compression ratio on engine characteristics of an SI engine fueled with equi-volume blend of methanol and gasoline

Author:
Nuthan Prasad, B.S.; Pandey, Jayashish Kumar; Kumar, G.N.
Source:
Energy 2020 v.191 pp. 116605
ISSN:
0360-5442
Subject:
hydrocarbons,   etc   ; carbon monoxide; combustion efficiency; gasoline; heat; methanol; nitrogen oxides;     Show all 7 Subjects
Abstract:
... In the present investigation, experiments were conducted in wide open throttle condition (WOT) for different speed ranging from 1200 rpm to 1800 rpm at an interval of 200 on a single-cylinder four-stroke variable compression ratio (VCR) SI engine. The engine fueled with equi-volume blend of methanol/gasoline fuel, while 14° BTDC ignition timing is maintained for all three different compression rat ...
DOI:
10.1016/j.energy.2019.116605

19. Study of organic pollution in superficial sediments of Meliane river catchment area: aliphatic and polycyclic aromatic hydrocarbons

Author:
Khabouchi, Imen; Khadhar, Samia; Driouich Chaouachi, Rim; Chekirbene, Anis; Asia, Laurence; Doumenq, Pierre
Source:
Environmental monitoring and assessment 2020 v.192 no.5 pp. 283
ISSN:
0167-6369
Subject:
chlorinated hydrocarbons; polycyclic aromatic hydrocarbons,   etc   ; bioaccumulation; human health; molecular weight; oils; organic matter; pollution; rivers; sediments; watersheds;     Show all 11 Subjects
Abstract:
... Organic contaminants can be accumulated in aquatic systems even at trace concentrations with potential threats to the environment and human health. The present study has been performed to evaluate the effects of organochlorines and polyaromatic hydrocarbons on surface sediments of the Meliane river catchment. Their determination provides an essential scientific approach for a better understanding ...
DOI:
10.1007/s10661-020-8213-6

20. Comment on “Exploiting electronic strategies to stabilize a planar tetracoordinate carbon in cyclic aromatic hydrocarbons” by O. Yañez et al., Chem. Commun., 2017, 53, 12112

Author:
Thimmakondu, Venkatesan S.
Source:
Chemical communications 2019 v.55 no.84 pp. 12719-12720
ISSN:
1364-548X
Subject:
aromatic hydrocarbons,   etc   ; carbon; chemical reactions;     Show all 3 Subjects
Abstract:
... Unequivocally, the global minimum geometry for C₇H₂ is the linear triplet ground electronic state of heptatriynylidene (1). However, the entitled article reports that the global minimum geometry for C₇H₂ is the singlet ground electronic state of 1-(buta-1,3-diynyl)cyclopropenylidene (2). We disagree with this result. ...
DOI:
10.1039/c9cc04639a