U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Subject "phenols" Remove constraint Subject: "phenols"
Start Over

Search

15,297  Search Results

« Previous | 1 - 20 of 15,297 |
Number of results to display per page

Search Results

1. Seven-Step Stereodivergent Total Syntheses of Punicafolin and Macaranganin

Author:
Shibayama, Hiromitsu; Ueda, Yoshihiro; Tanaka, Takashi; Kawabata, Takeo
Source:
Journal of the American Chemical Society 2021 v.143 no.3 pp. 1428-1434
ISSN:
1520-5126
Subject:
phenol,   etc   ; glucose; glycosides;     Show all 3 Subjects
Abstract:
... The first total syntheses of punicafolin (1) and macaranganin (2) were achieved in seven steps, respectively, from commercial α-d-glucose. The characteristic features of the synthesis are (1) sequential site-selective introduction of the adequate galloyl groups into unprotected d-glucose by a catalyst-controlled manner and (2) stereodivergent construction of the 3,6-HHDP bridge by oxidative phenol ...
DOI:
10.1021/jacs.0c10714

2. Cu-Catalyzed O-alkylation of phenol derivatives with alkylsilyl peroxides

Author:
Sakurai, Shunya; Kano, Taichi; Maruoka, Keiji
Source:
Chemical communications 2021 v.57 no.1 pp. 81-84
ISSN:
1364-548X
Subject:
phenol,   etc   ; alkylation; catalysts; ligands;     Show all 4 Subjects
Abstract:
... A Cu-catalyzed O-alkylation of phenol derivatives using alkylsilyl peroxides as alkyl radical precursors is described. The reaction proceeds smoothly under mild reaction conditions and the use of two different ligands with a Cu catalyst provides a wide range of products. A mechanistic study suggested that the reaction proceeds via a radical mechanism. ...
DOI:
10.1039/d0cc07305a

3. Synthesis of benzofuro[3,2-b]indolines via regioselective electrooxidative coupling of indoles and phenols

Author:
Li, Keyuan; Wang, Yuan; Chen, Lijun; Li, Lei; Jia, Yanxing
Source:
Tetrahedron letters 2021 v.63 pp. 152603
ISSN:
0040-4039
Subject:
phenols,   etc   ; indoles; regioselectivity; synthesis; yields;     Show all 5 Subjects
Abstract:
... A green and regioselective electrooxidative coupling reaction between indoles and phenols for the synthesis of benzofuro[3,2-b]indolines was developed. A variety of benzofuro[3,2-b]indolines were prepared in moderate to excellent yields. A plausible mechanism was proposed. ...
DOI:
10.1016/j.tetlet.2020.152603

4. Conversion of phenolic mixture to refractory resins: A resourcezation strategy for phenolic distillation residues

Author:
Zhou, Jing; Li, Xingang; Du, Jinze; He, Lin; Wang, Chengyang; Sui, Hong
Source:
Journal of hazardous materials 2021 v.414 pp. 125357
ISSN:
0304-3894
Subject:
phenol,   etc   ; carbon; distillation; ferrocenes; phenolic resins; temperature;     Show all 6 Subjects
Abstract:
... A new resourcezation way has been proposed to address the treatment challenges of the light phenolic distillation residue (LPDR) from the coal-based phenolic distillation residue. Herein, the LPDR, which was collected at 20 kPa and 220 °C from the phenolic distillation residue, has been further used to synthesize the phenolic resin (named as RPF) for MgO-C refractories. It is found that the conver ...
DOI:
10.1016/j.jhazmat.2021.125357

5. Highly efficient titanosilicate catalyst Ti-MCM-68 prepared using a liquid-phase titanium source for the phenol oxidation

Author:
Inagaki, Satoshi; Ishizuka, Ryo; Ikehara, Yuya; Odagawa, Shota; Asanuma, Kai; Morimoto, Shunsuke; Kubota, Yoshihiro
Source:
RSC advances 2021 v.11 no.6 pp. 3681-3684
ISSN:
2046-2069
Subject:
phenol,   etc   ; catalysts; catalytic activity; oxidation; titanium;     Show all 5 Subjects
Abstract:
... A highly efficient Ti-MCM-68 catalyst for phenol oxidation with H₂O₂ was prepared by a mild liquid-phase treatment for the first time. The key preparation procedures to excellent catalytic activity and high para-selectivity were the use of aqueous solutions of the Ti source and calcination at 650 °C prior to catalytic use. ...
DOI:
10.1039/d0ra10081a

6. Submerged arc plasma system combined with ozone oxidation for the treatment of wastewater containing non-degradable organic compounds

Author:
Lee, Byungjin; Jo, Eun Seo; Park, Dong-Wha; Choi, Jinsub
Source:
Frontiers of environmental science & engineering 2021 v.15 no.5 pp. 90
ISSN:
2095-2201
Subject:
phenol,   etc   ; energy; mineralization; oxidation; ozone; synergism; wastewater; wastewater treatment;     Show all 8 Subjects
Abstract:
... Submerged arc plasma technology was assessed for the removal of phenols from wastewater. The OH radicals generated from the boundary between the plasma and waste solution were considered as a significant factor on the degradation reaction. In this study, the effects of highly energetic electrons released from the submerged arc plasma were mainly studied. The highly energetic electrons directly bro ...
DOI:
10.1007/s11783-020-1384-0

7. A self-prepared graphene oxide/sodium alginate aerogel as biological carrier to improve the performance of a heterotrophic nitrifier

Author:
Liu, Yuxiang; Li, Yueping; Yuan, Xin; Ren, Ruipeng; Lv, Yongkang
Source:
Biochemical engineering journal 2021 v.171 pp. 108027
ISSN:
1369-703X
Subject:
phenol,   etc   ; adsorption; aerogels; graphene oxide; nitrification; sodium alginate; toxicity;     Show all 7 Subjects
Abstract:
... In order to enhance the resistance of microorganisms to toxic substance and adverse environment, graphene oxide/sodium alginate (GO/SA) aerogel was synthesized and used as adsorption material to immobilize heterotrophic nitrifier consortium FG-06. The aerogel showed the lamellar and network structure with a lot of oxygen-containing functional groups. Consortium FG-06 could be adsorbed and grow on ...
DOI:
10.1016/j.bej.2021.108027

8. Iron(II) sulfate crystals assisted mechanochemical modification of microscale zero-valent aluminum (mZVAl) for oxidative degradation of phenol in water

Author:
Wu, Sui; Yang, Shiying; Li, Qianfeng; Wang, Manqian; Xue, Yichao; Zhao, Dongye
Source:
Chemosphere 2021 v.274 pp. 129767
ISSN:
0045-6535
Subject:
phenol,   etc   ; aluminum; catalysts; electron transfer; longevity; mechanochemistry; pH;     Show all 7 Subjects
Abstract:
... Microscale zero-valent aluminum (mZVAl) is prone to surface passivation due to formation of the surface Al-(hydr)oxide layer, resulting in short reactive life. To overcome this critical drawback, we developed a mechanochemical ball milling approach to modify and activate commercially available mZVAl assisted by the fragile FeSO₄·7H₂O crystals. SEM-EDS and XPS analyses indicated that the particle s ...
DOI:
10.1016/j.chemosphere.2021.129767

9. Simultaneous separation of insulin and six therapeutic analogues on a mixed mode column: HPLC-UV method development and application

Author:
Kristl, Anja; Podgornik, Aleš; Pompe, Matevž
Source:
Journal of chromatography 2021 v.1171 pp. 122557
ISSN:
1570-0232
Subject:
phenol,   etc   ; anion exchange; humans; insulin; mass spectrometry; solvents; therapeutics;     Show all 7 Subjects
Abstract:
... Human insulin and six most used therapeutic analogues are very similar in terms of retention on a reversed-phase column. Thus, the LC methods prescribed in the European Pharmacopoeia monographs for insulin and insulin analogues include many similar separation methods, which tend to be time consuming when separating individual products of insulins or are inadequate when handling a mixture. In this ...
DOI:
10.1016/j.jchromb.2021.122557

10. Solid peroxides in Fenton-like reactions at near neutral pHs: Superior performance of MgO2 on the accelerated reduction of ferric species

Author:
Zhu, Yitong; Qin, Jiaolong; Zhang, Shuqi; Radian, Adi; Long, Mingce
Source:
Chemosphere 2021 v.270 pp. 128639
ISSN:
0045-6535
Subject:
phenol,   etc   ; hydrogen peroxide; oxygen; pH; phosphates; reaction kinetics; urea;     Show all 7 Subjects
Abstract:
... Fenton-like reactions at near neutral pHs are limited by the slow reduction of ferric species. Enhancing generation of ▪ from solid peroxides is a promising strategy to accelerate the rate-limiting step. Herein, the H₂O₂ release and Fenton-like reactions of four solid peroxides, MgO₂, CaO₂, ZnO₂ and urea hydrogen peroxide (UHP), were investigated. Results indicated that UHP can release H₂O₂ instan ...
DOI:
10.1016/j.chemosphere.2020.128639

11. Effect of Fe3O4 nanoparticles exposure on the treatment efficiency of phenol wastewater and community shifts in SBR system

Author:
Zeng, Qianzhi; Xu, Jin; Hou, Yuan; Li, Hongxin; Du, Cong; Jiang, Bei; Shi, Shengnan
Source:
Journal of hazardous materials 2021 v.407 pp. 124828
ISSN:
0304-3894
Subject:
phenol,   etc   ; biodegradation; chronic exposure; ecotoxicology; magnetism; polysaccharides; spectral analysis; wastewater;     Show all 8 Subjects
Abstract:
... Increasing magnetic Fe₃O₄ nanoparticles (Fe₃O₄ NPs) application has aroused concern about its potential environmental toxicity. During acute and chronic exposure, key enzymes involved in phenol biodegradation were promoted at 0–600 mg/L Fe₃O₄ NPs, while were inhibited at 800 mg/L Fe₃O₄ NPs, correspondingly affected phenol degradation efficiency. Lactic dehydrogenase (LDH) increased when Fe₃O₄ NPs ...
DOI:
10.1016/j.jhazmat.2020.124828

12. Impact of Foliar Application of Amino Acids on Total Phenols, Phenolic Acids Content of Different Mints Varieties under the Field Condition

Author:
Tarasevičienė, Živilė; Velička, Aloyzas; Paulauskienė, Aurelija
Source:
Plants 2021 v.10 no.3
ISSN:
2223-7747
Subject:
phenols,   etc   ; Mentha piperita; foliar application; human health; phenylalanine; tryptophan; tyrosine;     Show all 7 Subjects
Abstract:
... Phenolic compounds have a number of benefits to human health and can be used as preventive compounds for the development of some chronic diseases. Mentha plants are not only a good source of essential oils, but also contain significant levels of wide range of phenolic compounds. The aim of this research was to investigate the possibility to increase phenols content in Mentha plants under the folia ...
DOI:
10.3390/plants10030599

13. Enhancement of PAHs biodegradation in biosurfactant/phenol system by increasing the bioavailability of PAHs

Author:
Zang, Tingting; Wu, Haizhen; Yan, Bo; Zhang, Yuxiu; Wei, Chaohai
Source:
Chemosphere 2021 v.266 pp. 128941
ISSN:
0045-6535
Subject:
phenol,   etc   ; Stenotrophomonas; bioavailability; biodegradation; biosurfactants; micelles; molecular weight; sludge; solubilization;     Show all 9 Subjects
Abstract:
... The poor bioavailability of polycyclic aromatic hydrocarbons (PAHs) is the main limiting factor for their biodegradation in contaminated sites. The addition of biosurfactant is an effective method for enhancing the bioavailability of PAHs. Suitable low molecular weight (LMW) organic matters have been shown to increase the bioavailability of PAHs. Therefore, we investigated the effect of phenol, wh ...
DOI:
10.1016/j.chemosphere.2020.128941

14. Synthesis, characterization, optoelectronic and photocatalytic properties of Sr2Bi2O5/SrCO3 and Sr3Bi2O6/SrCO3 heterostructures with varying SrCO3 content

Author:
Shtarev, Dmitry S.; Shtareva, Anna V.; Kevorkyants, Ruslan; Syuy, Alexander V.
Source:
Chemosphere 2021 v.267 pp. 129229
ISSN:
0045-6535
Subject:
phenol,   etc   ; aqueous solutions; permeability; photocatalysis; photoluminescence; photolysis; semiconductors;     Show all 7 Subjects
Abstract:
... We report on the structure and properties of novel Sr₂Bi₂O₅/SrCO₃ and Sr₃Bi₂O₆/SrCO₃ heterostructures with SrCO₃ content varying from 10 wt% to 90 wt%. Formation of the heterostructures is succeeded via sintering technique and according to XRD, SEM, and EDX studies has resulted in highly crystalline materials with well-defined carbonate-bismuthate interfaces. In the reaction of photodegradation of ...
DOI:
10.1016/j.chemosphere.2020.129229

15. Understanding of TiO2 catalysis mechanism in underwater pulsed discharge system: Charge carrier generation and interfacial charge-transfer processes

Author:
Duan, Lijuan; Rao, Shuai; Wang, Dongxing; Zhang, Kuifang; Cao, Hongyang; Liu, Zhiqiang; Guo, Qiusong; Li, Wei; Tao, Jinzhang; Gao, Yuan
Source:
Chemosphere 2021 v.267 pp. 129249
ISSN:
0045-6535
Subject:
phenol,   etc   ; benzoquinones; hydroquinone; oxygen; ozone; photocatalysis; redox potential; titanium dioxide;     Show all 8 Subjects
Abstract:
... Compared with traditional photocatalysis system, TiO₂ charge carrier generation and interfacial charge-transfer process may be influenced by various chemical and physical effects in underwater pulsed discharge plasma system. Here, the role of high-energy electron, ozone in TiO₂ charge carrier generation and transfer process has been investigated using phenol as the probe molecule. The introduction ...
DOI:
10.1016/j.chemosphere.2020.129249

16. Copper-catalyzed one-pot synthesis of amide linked 1,2,3-triazoles bearing aryloxy skeletons

Author:
Asgari, Mohammad Sadegh; Bahadorikhalili, Saeed; Ghaempanah, Aram; Rashidi Ranjbar, Parviz; Rahimi, Rahmatollah; Abbasi, Alireza; Larijani, Bagher; Mahdavi, Mohammad
Source:
Tetrahedron letters 2021 v.65 pp. 152765
ISSN:
0040-4039
Subject:
phenol,   etc   ; halides; mass spectrometry; melting point; moieties; paper; synthesis; yields;     Show all 8 Subjects
Abstract:
... In this paper, novel amide linked 1,2,3-triazoles containing aryloxy derivatives (8a–l) are synthesized via copper-catalyzed one-pot sequential hydroxylation-O-alkylation/click reaction of 2-bromo-N-prop-2-ynyl-benzamides. The products are synthesized in an efficient way in high isolated yields. The synthetic method involves the use of 2-bromo-N-prop-2-ynyl-benzamide and various benzyl halides ove ...
DOI:
10.1016/j.tetlet.2020.152765

17. A reappraisal of the structure of xylosmin

Author:
Prangé, Thierry; Lavaud, Catherine; Massiot, Georges
Source:
Phytochemistry letters 2021 v.41 pp. 123-124
ISSN:
1874-3900
Subject:
phenol,   etc   ; Salicaceae; X-ray diffraction; glycosides; plant biochemistry; sugars;     Show all 6 Subjects
Abstract:
... The structure of xylosmin, a phenol glycoside from Salicaceae has been precised through a new interpretation of previously published X-ray crystallography data. This was based on the assignment of β-d-glucose for the sugar part of the molecule. ...
DOI:
10.1016/j.phytol.2020.11.007

18. A study of external mass transfer effect on biodegradation of phenol using low‐density polyethylene immobilized Bacillus flexus GS1 IIT (BHU) in a packed bed bioreactor

Author:
Swain, Ganesh; Sonwani, Ravi Kumar; Giri, Balendu Shekhar; Singh, Ram Sharan; Jaiswal, Ravi Prakash; Rai, Birendra Nath
Source:
Water and environment journal 2021 v.35 no.1 pp. 285-294
ISSN:
1747-6585
Subject:
phenol,   etc   ; Bacillus flexus; biodegradation; bioreactors; environment; mass transfer; polyethylene; water;     Show all 8 Subjects
Abstract:
... The impact of external mass transport on the biodegradation rate of phenol in a packed bed bioreactor (PBBR) was studied. A potential bacterial species, Bacillus flexus GS1 IIT (BHU), was isolated from the petroleum‐contaminated soil. Low‐density polyethylene (LDPE) immobilized with the B. flexus GS1 IIT (BHU) was used as packing material in the PBBR. The PBBR was operated by varying the inlet fee ...
DOI:
10.1111/wej.12626

19. Oxidative degradation of phenol by sulfidated zero valent iron under aerobic conditions: The effect of oxalate and tripolyphosphate ligands

Author:
Kong, Xianglong; Zhang, Chengwu; Zhang, Jingyi; Xuan, Lishuang; Qin, Chuanyu
Source:
Journal of environmental sciences (China) 2021 v.100 pp. 82-89
ISSN:
1001-0742
Subject:
phenol,   etc   ; electron transfer; iron; ligands; oxalates; oxidation; sulfur; tripolyphosphates; China;     Show all 9 Subjects
Abstract:
... After adding either organic or inorganic ligands, sulfidated nano-zero-valent iron (SnZVI) was used for aerobic degradation of phenol, and the effect of the ligand species on oxidation performance was investigated. We found that SnZVI hardly degraded phenol in the absence of ligand addition. Ligands initiated and promoted the degradation of pollutants by SnZVI. The data herein show that a characte ...
DOI:
10.1016/j.jes.2020.07.018

20. Study of inhibition of germination of potato by ethylene

Author:
Dako, Etienne; Jankowski, Christopher K.; Gnimassou, Yves-Marie; Lebeau, Diane
Source:
Heliyon 2021 v.7 no.2 pp. e06175
ISSN:
2405-8440
Subject:
phenol,   etc   ; Solanum tuberosum; ethylene; germination; potatoes; temperature; Canada;     Show all 7 Subjects
Abstract:
... In Canada, the potato (Solanum tuberosum) is by far the most cultivated vegetable and plays a major nutritional role. However, during storage, the potato can easily undergo germination. In this study we have shown the inhibition potential of ethylene as an anti-germinative agent acting especially on phenols. In both varieties assayed (Yukon Gold and Russet Burbank) in this study, the ethylene trea ...
DOI:
10.1016/j.heliyon.2021.e06175