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1. Two New Depsidones from Parmelia saxatilis

Author:
Xigurigan,; Tunuomula,; Haliga,; Bai, Shu Zhen; Ganchimeg,; Qirigeer,; Yang, Li Guo; Bai, Laxinamujila
Source:
Chemistry of natural compounds 2021 v.57 no.1 pp. 63-65
ISSN:
0009-3130
Subject:
dibenzofuran,   etc   ; Parmelia; chemistry; spectral analysis; usnic acid;     Show all 5 Subjects
Abstract:
... Two new depsidones, diffractione B (1) and salazinin A (2), and two known compounds, the dibenzofuran derivative usnic acid (3) and depsidone salazinic acid (4), were isolated from Parmelia saxatilis. The structures of the isolated compounds were identified by spectral analysis and comparison with literature data. ...
DOI:
10.1007/s10600-021-03283-4

2. Access to Dibenzofurans through Dimerization/Trimerization of Cyclohexanones Followed by Dehydroaromatization

Author:
Jiang, Pingyu; Chen, Shanping; Xia, Yi; Zhang, Qingqing; Deng, Guo-Jun
Source:
Organic letters 2020 v.22 no.20 pp. 8076-8081
ISSN:
1523-7052
Subject:
dibenzofuran,   etc   ; cyclohexanones; dimerization;     Show all 3 Subjects
Abstract:
... A novel and efficient method for the synthesis of unsymmetrical substituted dibenzofurans has been developed, which can selectively produce disubstituted dibenzofurans and trisubstituted dibenzofurans products under metal-free conditions. This approach starts from cheap and available nonaromatic cyclohexanones, affording a simple and efficient access to unsymmetrical substituted dibenzofurans. ...
DOI:
10.1021/acs.orglett.0c03023

3. Environmental characteristics and formations of polybrominated dibenzo-p-dioxins and dibenzofurans

Author:
Yang, Lili; Liu, Guorui; Shen, Jia; Wang, Minxiang; Yang, Qiuting; Zheng, Minghui
Source:
Environment international 2021 v.152 pp. 106450
ISSN:
0160-4120
Subject:
dibenzofuran,   etc   ; biphenyl; bromination; environment; furans; humans; photolysis; pollution; thermal degradation;     Show all 9 Subjects
Abstract:
... Polybrominated dibenzo-p-dioxins and furans (PBDD/Fs) are emerging persistent organic pollutants (POPs) that have similar or higher toxicities than the notorious dioxins. Toxicities, formation mechanisms, and environmental fates of PBDD/Fs are lacking because accurate quantification, especially of higher brominated congeners, is challenging. PBDD/F analysis is difficult because of photolysis and t ...
DOI:
10.1016/j.envint.2021.106450

4. The homogeneous gas-phase formation mechanisms of PCPTs/PCDTs/PCDFs from the radical/radical cross-condensation of 2-CPR and 2-CTPR: a theoretical, mechanistic and kinetics study

Author:
Li, Ying; Han, Yanan; Teng, Zhuochao; Zhao, Xianwei; Sun, Yanhui; Xu, Fei; Zhang, Qingzhu; Wang, Wenxing
Source:
RSC advances 2021 v.11 no.21 pp. 12626-12640
ISSN:
2046-2069
Subject:
polychlorinated dibenzofurans,   etc   ; chlorophenols; combustion; density functional theory; polychlorinated dibenzodioxins; toxicity;     Show all 6 Subjects
Abstract:
... Polychlorinated phenoxathiins (PCPTs) are one group of dioxin-like compounds, which can be considered to be one-oxygen-substituted polychlorinated thianthrene (PCTA) compounds or one-sulfur-substituted polychlorinated dibenzo-p-dioxin (PCDD) compounds. Owing to their high toxicity and wide distribution, clarifying the formation and emission of PCPTs due to combustion and thermal processes can deep ...
DOI:
10.1039/d1ra00599e

5. Visible-Light-Induced Cyclization/Aromatization of 2-Vinyloxy Arylalkynes: Synthesis of Thio-Substituted Dibenzofuran Derivatives

Author:
Chen, Hui; Yan, Yunyun; Zhang, Niuniu; Mo, Zuyu; Xu, Yanli; Chen, Yanyan
Source:
Organic letters 2020 v.23 no.2 pp. 376-381
ISSN:
1523-7052
Subject:
dibenzofuran,   etc   ; aromatization; disulfides; hydrogen; oxygen;     Show all 5 Subjects
Abstract:
... A visible-light-induced cascade reaction of 2-vinyloxy arylalkynes with thiosulfonates was developed and provided unexpected thio-substituted dibenzofuran derivatives in moderate yields. Mechanistic studies revealed the thiosulfonylation product of 2-vinyloxy arylalkyne was the key intermediate, and the additive disulfide played the role of hydrogen abstraction in the aromatization process to offe ...
DOI:
10.1021/acs.orglett.0c03876

6. The formation of PBDFs from the ortho-disubstituted phenol precursors: A comprehensive theoretical study on the PBDD/Fs formation from 2,4,6-tribromophenol

Author:
Chang, Jiamin; Pan, Wenxiao; Liu, Xian; Xue, Qiao; Fu, Jianjie; Zhang, Aiqian
Source:
The Science of the total environment 2020 v.713 pp. 136657
ISSN:
0048-9697
Subject:
dibenzofuran,   etc   ; bromination; phenol; thermodynamics; toxicity;     Show all 5 Subjects
Abstract:
... Bromophenols are known as direct precursors of the notorious polybrominated dibenzo-p-dioxin/dibenzofurans (PBDD/Fs). There is a long-held viewpoint that only the more toxic dioxin-type products could be formed from the ortho-disubstituted phenols, totally contrary to the experimental observations that both PBDDs and PBDFs are generated. To tackle the issue, the gaseous formation mechanism of PBDD ...
DOI:
10.1016/j.scitotenv.2020.136657

7. Comprehensive screening of polybromochlorodibenzo-p-dioxins, dibenzofurans as mixed halogenated compounds in wastewater samples from industrial facilities by GC×GC/ToFMS and post-data processing

Author:
Hashimoto, Shunji; Matsukami, Hidenori; Ieda, Teruyo; Suzuki, Go
Source:
Chemosphere 2021 v.276 pp. 130085
ISSN:
0045-6535
Subject:
dibenzofuran,   etc   ; bromination; computer simulation; fabrics; human health; landfills; leachates; mass spectrometry; wastewater;     Show all 9 Subjects
Abstract:
... An enormous number of pollutants must be investigated to be able to understand which types threaten human health and environmental biota. In this study, we propose a workflow for screening polybromochlorodibenzo-p-dioxins and dibenzofurans (PBCDD/Fs), which are compounds that have thousands of isomers and congeners, by combining measurement of a sample without any in-laboratory-cleanup with the re ...
DOI:
10.1016/j.chemosphere.2021.130085

8. Slopes and intercepts from log-log correlations of gas/particle quotient and octanol-air partition coefficient (vapor-pressure) for semi-volatile organic compounds: II. Theoretical predictions vs. monitoring

Author:
Qiao, Li-Na; Ma, Wan-Li; Zhang, Zi-Feng; Liu, Li-Yan; Song, Wei-Wei; Jia, Hong-Liang; Zhu, Ning-Zheng; Li, Wen-Long; Macdonald, Robie W.; Nikolaev, Anatoly; Li, Yi-Fan
Source:
Chemosphere 2021 v.273 pp. 128860
ISSN:
0045-6535
Subject:
dibenzofuran,   etc   ; biphenyl; bromination; equilibrium theory; liquids; paper; polychlorinated dibenzodioxins; vapor pressure; volatile organic compounds;     Show all 9 Subjects
Abstract:
... The logarithm of gas/particle (G/P) partition quotient (logKP) has been found to have a linear relationship with logKOA (octanol-air partition coefficient) with slope mₒ and intercept bₒ and logPL (subcooled liquid vapor pressure) with slope mₚ and intercept bₚ. In the sister paper of the present work, analytical equations to predict the slope mₒ and intercept bₒ based on logKOA and predict the sl ...
DOI:
10.1016/j.chemosphere.2020.128860

9. Field-scale study of co-processing dichlorodiphenyltrichloroethane-contaminated soil in a cement kiln

Author:
Yang, Liuyang; Wang, Lei; Cui, Changhao; Liu, Meijia; Li, Li; Yan, Dahai
Source:
Waste management 2021 v.126 pp. 133-140
ISSN:
0956-053X
Subject:
dibenzofuran,   etc   ; DDT (pesticide); cement; dust; flue gas; kilns; polychlorinated biphenyls; solid wastes; waste management; China;     Show all 10 Subjects
Abstract:
... Persistent organic pollutants in soil are not readily degraded in the short term. The utilization of co-processing solid waste in cement kilns has received increasing attention in recent years. Co-processing may be a good way of disposing of dichlorodiphenyltrichloroethane-contaminated soil (CS). The feasibility of co-processing CS pretreated to desorb dichlorodiphenyltrichloroethane, was assessed ...
DOI:
10.1016/j.wasman.2021.03.015

10. Chemometric mapping of polychlorinated dibenzo-p-dioxin (PCDD) and dibenzofuran (PCDF) congeners from the Passaic River, NJ: Integrated application of RSIMCA, PVA, and t-SNE

Author:
Cejas, Mark J.; Barrick, Robert C.
Source:
Environmental forensics 2021 v.22 no.1-2 pp. 155-171
ISSN:
1527-5930
Subject:
dibenzofuran,   etc   ; chemometrics; data collection; data visualization; highlands; inventories; polychlorinated dibenzodioxins; rivers; sediments; weight-of-evidence;     Show all 10 Subjects
Abstract:
... Robust Independent Modelling of Class Analogy (RSIMCA) was applied to classify over 2,800 Passaic River sediment samples into seven groups or not assigned to any group after an initial screening of a 3,255 sample dataset. This multivariate statistical output was compressed from seven latent dimensions into two interpretable dimensions using t-Distributed Stochastic Neighbor Embedding (t-SNE) graph ...
DOI:
10.1080/15275922.2020.1834022

11. Occurrence, Human Exposure, and Risk Assessment of Polybrominated Dibenzo-p-Dioxins and Dibenzofurans, Polychlorinated Naphthalenes, and Metals in Atmosphere Around Industrial Parks in Jiangsu, China

Author:
Xu, Shen; Liu, Wei; Liu, Guang-Bing; Wang, Shui; Li, Chao; Pan, Ke
Source:
Bulletin of environmental contamination and toxicology 2021 v.106 no.4 pp. 683-689
ISSN:
0007-4861
Subject:
dibenzofuran,   etc   ; ; air; air quality; carcinogenicity; humans; inhalation exposure; pollution; risk; risk assessment; toxicology; China;     Show all 12 Subjects
Abstract:
... Air samples were collected around industrial parks in Jiangsu, China, to allow the concentrations, profiles, and risk assessment of polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs), polychlorinated naphthalenes (PCNs), and metals to be investigated. The concentrations of ΣPBDD/Fs and ΣPCNs were 1324.26–2080.98 fg/m³ (11.35–42.57 fg I-TEQ/m³) and 10,404.9–29,322.9 fg/m³ (1.32–7.19 fg I- ...
DOI:
10.1007/s00128-021-03141-7

12. Dioxins and dioxin-like PCBs in the ambient air of the Valencian Region (Spain): Levels, human exposure, and risk assessment

Author:
López, Antonio; Coscollà, Clara; Hernández, Cristina S.; Pardo, Olga; Yusà, Vicent
Source:
Chemosphere 2021 v.267 pp. 128902
ISSN:
0045-6535
Subject:
polychlorinated dibenzofurans,   etc   ; acceptable daily intake; air; breathing; chronic exposure; humans; polychlorinated dibenzodioxins; risk; risk assessment; Spain;     Show all 10 Subjects
Abstract:
... Dioxins (polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF), as well as dioxin-like PCBs (dl-PCBs), are listed as persistent organic pollutants in the Stockholm Convention. In this study, we measured their concentrations in the particulate phase (PM10) of the ambient air in seven monitoring stations of the Valencian Community (Spain). A total of 82 samples were colle ...
DOI:
10.1016/j.chemosphere.2020.128902

13. Occurrence and geochemical significance of fluorene and alkylfluorenes in crude oils and source rock extracts from Niger Delta basin, Nigeria

Author:
Ogbesejana, Abiodun B.; Bello, Oluwasesan M.; Okunola, Oluwole Joshua
Source:
Heliyon 2021 v.7 no.3 pp. e06616
ISSN:
2405-8440
Subject:
dibenzofuran,   etc   ; basins; biomarkers; fluorenes; light microscopy; oils; organic matter; river deltas; Nigeria;     Show all 9 Subjects
Abstract:
... The crude oils and their source rocks from Niger Delta basin, Nigeria were investigated by optical microscopy for the maceral compositions and by gas chromatography - mass spectrometry (GC-MS) for the composition, distribution and abundances of saturated and aromatic biomarkers. The data obtained showed that the rock samples and crude oils were formed from the mixed input of terrestrial and marine ...
DOI:
10.1016/j.heliyon.2021.e06616

14. Highly Selective Hydrodeoxygenation of Dibenzofuran into Bicyclohexane over Hierarchical Pt/ZSM-5 Catalysts

Author:
Li, Xiaoxue; Niu, Xiaopo; Zhu, Shuaikang; Xu, Shuang; Wang, Zheyuan; Zhang, Xiangwen; Wang, Qingfa
Source:
Industrial & engineering chemistry process design and development 2021 v.60 no.7 pp. 2838-2848
ISSN:
1520-5045
Subject:
dibenzofuran,   etc   ; acidity; biofuels; catalysts; catalytic activity; chlorides; hydrogenation; porous media; process design; synergism; zeolites;     Show all 11 Subjects
Abstract:
... Fabricating zeolite-supported catalysts with excellent catalytic performance for hydroconversion of bio-oils into high-quality fuels is still a great challenge. Herein, hierarchical ZSM-5 zeolites were successfully synthesized with 3-[(trimethoxysilyl) propyl] octadecyldimethylammonium chloride as a mesoporous template. The hierarchical ZSM-5 supported Pt catalysts (Pt/HZ-x) were used to enhance t ...
DOI:
10.1021/acs.iecr.0c05488

15. A Pseudomonas sp. strain uniquely degrades PAHs and heterocyclic derivatives via lateral dioxygenation pathways

Author:
Liu, Yunli; Hu, Haiyang; Zanaroli, Giulio; Xu, Ping; Tang, Hongzhi
Source:
Journal of hazardous materials 2021 v.403 pp. 123956
ISSN:
0304-3894
Subject:
dibenzofuran,   etc   ; Pseudomonas brassicacearum; fluorenes; genomics; humans; multigene family; naphthalene; risk; transcriptomics;     Show all 9 Subjects
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs) and heterocyclic derivatives are organic pollutants that pose a serious health risk to human beings. In this study, a newly isolated Pseudomonas brassicacearum strain MPDS could effectively degrade PAHs and heterocyclic derivatives, including naphthalene, fluorene, dibenzofuran (DBF) and dibenzothiophene (DBT). Notably, strain MPDS is able to degrade fluoren ...
DOI:
10.1016/j.jhazmat.2020.123956

16. PCDD/Fs emissions from secondary copper production synergistically controlled by fabric filters and desulfurization

Author:
Li, Haifeng; Liu, Wenbin; Lu, Anxiang; Li, Cheng; Die, Qingqi; Lei, Rongrong; Wu, Xiaolin
Source:
Environmental pollution 2021 v.270 pp. 116065
ISSN:
0269-7491
Subject:
dibenzofuran,   etc   ; World Health Organization; anodes; desulfurization; fabrics; fly ash; furnaces; gypsum; pollution; polychlorinated dibenzodioxins; toxicity;     Show all 11 Subjects
Abstract:
... The effects of fabric filters and desulfurization systems during secondary copper smelting on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) concentrations, emission coefficients, and profiles were studied in an oxygen-rich smelting furnace and an anode furnace. In the anode furnace, the toxic equivalent (TEQ) concentration ranges were 0.106–1.04 ng World Health Organization (WHO)-T ...
DOI:
10.1016/j.envpol.2020.116065

17. Formation pathways of polychlorinated dibenzo-p-dioxins and dibenzofurans from burning simulated PVC-coated cable wires

Author:
Zhang, Mengmei; Fujimori, Takashi; Shiota, Kenji; Li, Xiaodong; Takaoka, Masaki
Source:
Chemosphere 2021 v.264 pp. 128542
ISSN:
0045-6535
Subject:
dibenzofuran,   etc   ; X-radiation; absorption; aromatization; carbon; chlorination; copper; crosslinking; isomers; polychlorinated dibenzodioxins; polyenes; temperature; thermogravimetry;     Show all 13 Subjects
Abstract:
... Open burning of PVC-coated cables is a major source of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F). In the present study, the formation characteristics of PCDD/F from burning of PVC-based samples with and without metallic copper were evaluated over the dioxin formation temperature window (200–500 °C). This temperature range also inevitably occurs under open burning conditions. The ...
DOI:
10.1016/j.chemosphere.2020.128542

18. Combustion performance and emissions from torrefied and water washed biomass using a kg-scale burner

Author:
Chen, Chia-Yang; Chen, Wei-Hsin; Hung, Chung-Hsien
Source:
Journal of hazardous materials 2021 v.402 pp. 123468
ISSN:
0304-3894
Subject:
dibenzofuran,   etc   ; air; biomass; carbon; chlorine; coal; combustion; heat; polychlorinated dibenzodioxins; torrefaction; toxicity; water solubility;     Show all 12 Subjects
Abstract:
... This study investigates wastes and biomass as alternative fuels in a kg-scale burner in terms of combustion characteristics and emissions. Water washing, torrefaction, and their combination are used to improve the properties of the wastes and biomass. The air pollutants in the exhaust of the burner are also analyzed. It could be concluded that the reactivity and average heat supply from the pretre ...
DOI:
10.1016/j.jhazmat.2020.123468

19. High levels of dioxins and PCBs in meat, fat and livers of free ranging pigs, goats, sheep and cows from the island of Curaçao

Author:
Hoogenboom, Ron L.A.P.; Dam, Guillaume ten; van Leeuwen, Stefan P.J.; van Egmond, Harry; Nicolina, Jennyfer; Dwarkasing, Arnold J.S.
Source:
Chemosphere 2021 v.263 pp. 128057
ISSN:
0045-6535
Subject:
dibenzofuran,   etc   ; adipose tissue; forage; lipids; liver; meat; polychlorinated biphenyls; polychlorinated dibenzodioxins; sheep; toxicity;     Show all 10 Subjects
Abstract:
... Samples of adipose tissue, meat and livers from pigs, cows, sheep and goats from Curaçao were analysed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), and dioxin-like (dl-) and non-dioxin-like (ndl-) PCBs (polychlorinated biphenyls). Levels in many samples of adipose tissue were higher than the EU maximum levels (MLs) for PCDD/Fs and the sum of PCDD/Fs and dl-PCBs (sum-TEQ), ind ...
DOI:
10.1016/j.chemosphere.2020.128057

20. Induction of AhR transactivation by PBDD/Fs and PCDD/Fs using a novel human-relevant, high-throughput DRhuman CALUX reporter gene assay

Author:
Budin, Clémence; Besselink, Harrie; van Vugt-Lussenburg, Barbara M.A.; Man, Hai-Yen; van der Burg, Bart; Brouwer, Abraham
Source:
Chemosphere 2021 v.263 pp. 128086
ISSN:
0045-6535
Subject:
dibenzofuran,   etc   ; aryl hydrocarbon receptors; automation; bromination; human health; humans; liver; reporter genes; toxicity; toxicology; transcriptional activation;     Show all 11 Subjects
Abstract:
... Polychlorinated dioxins and dibenzofurans (PCDD/Fs) are highly toxic contaminants that are strictly regulated and monitored in the environment and food to reduce human exposure. Recently, the increasing occurrence of polybrominated dioxins and dibenzofurans (PBDD/Fs) in the environment is raising concerns about the impact on human health by the combined exposure to chlorinated and brominated analo ...
DOI:
10.1016/j.chemosphere.2020.128086