Log in

Relevant bibliographies by topics / Dioxin derivates / Journal articles

To see the other types of publications on this topic, follow the link: Dioxin derivates.

Journal articles on the topic 'Dioxin derivates'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Dioxin derivates.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Leśków, A., M. Nawrocka, M. Łątkowska, M. Tarnowska, N. Galas, A. Matejuk, and I. Całkosiński. "Can contamination of the environment by dioxins cause craniofacial defects?" Human & Experimental Toxicology 38, no. 9 (June 6, 2019): 1014–23. http://dx.doi.org/10.1177/0960327119855121.

Full text

Abstract:

Cleft lip and cleft palate also known as orofacial cleft is a congenital malformation involving the partial or total lack of anatomical continuity of craniofacial tissue. The most common environmental factors that may cause orofacial clefts include pharmaceuticals, alcohol, addictive drugs, and tobacco smoke. Living in the area of industrial factories, garbage, ironworks, crematoria, wastewater treatment plants, and plastic waste landfills also has a significant impact on the development of the craniofacial defects. Some of the main factors causing the formation of congenital craniofacial defects are dioxins, of which emission to the environment is an important environmental and health problem. Dioxins are a diverse group of organic chemical compounds, derivatives of oxanthrene and fumarates, which are organoleptically imperceptible. Acting mainly through induction of inflammation, they influence a number of metabolic processes, including the process of bone mineralization and embryonic development. In this work, we highlight the problem of orofacial cleft including the impact of dioxin on development of this defect and the recommended prevention.

APA, Harvard, Vancouver, ISO, and other styles

2

Kuhn, Norbert, Ahmed Al-Sheikh, and Manfred Steimann. "Synthesis and Structure of 1-{2,2-Dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3- dioxan-5-yl}pyridinium Ylide: A New Route to Meldrum’s Acid Derivatives." Zeitschrift für Naturforschung B 58, no. 5 (May 1, 2003): 381–84. http://dx.doi.org/10.1515/znb-2003-0504.

Full text

Abstract:

2-Bromo-5,5-dimethyl-4,6-dioxo-1,3-dioxine (3) reacts with pyridine and aqueous potassium carbonate to give 1-{2,2-dimethyl-4,6-dioxo-5-(1-pyridinio)-1,3-dioxan-5-yl}pyridinium ylide (5). The crystal structure analysis confirms the betaine nature of 5 consisting of two distored ring fragments [interplanar angle 58.0(4)°] connected by a C-N single bond [1.440(1) Å ].

APA, Harvard, Vancouver, ISO, and other styles

3

Kuhn, Norbert, Ahmad Al-Sheikh, Simon Schwarz, and Manfred Steimann. "Zwitterionische Imidazolium- und Phosphonium-Derivate der Methylenmeldrumsäure [1,2] / Zwitterionic Imidazolium and Phosphonium Derivatives of Methylene-Meldrum’s Acid [1,2]." Zeitschrift für Naturforschung B 60, no. 4 (April 1, 2005): 398–402. http://dx.doi.org/10.1515/znb-2005-0407.

Full text

Abstract:

2,2-Dimethyl-4,6-dioxo-5-pyridinomethyl-1,3-dioxan-5-yl-pyridinium ylide (9) reacts with 2,3-dihydro- 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (1; R1 = iPr, R2 = Me) to give the zwitterionic imidazolium derivative 2,2-dimethyl-4,6-dioxo-5-(1,3-diisopropyl-4,5-dimethylimidazoliomethyl)- 1,3-dioxan-5-yl-imidazolium ylide (4) in good yield. Similarly, the phosphonium compound 2,2-dimethyl-4,6-dioxo-5-triphenylphosphoniomethyl-1,3-dioxan-5-yl-phosphonium ylide (5) is obtained from 9 and PPh3. The crystal structures of 4 and 5 are reported

APA, Harvard, Vancouver, ISO, and other styles

4

Altarawneh, Mohammednoor, and Bogdan Z. Dlugogorski. "Formation of dibenzofuran, dibenzo-p-dioxin and their hydroxylated derivatives from catechol." Physical Chemistry Chemical Physics 17, no. 3 (2015): 1822–30. http://dx.doi.org/10.1039/c4cp04168b.

Full text

Abstract:

This study presents mechanistic and kinetic accounts of the formation of dibenzofuran (DF), dibenzo-p-dioxin (DD) and their hydroxylated derivatives (OHs-DF/OHs-DD) from the catechol (CT) molecule, as model compounds for phenolic constituents in biomass.

APA, Harvard, Vancouver, ISO, and other styles

5

El-Meligie, Salwa E. M., Nadia A. Khalil, Hala B. El-Nassan, and Ahmed A. M. Ibraheem. "A Review on the Synthetic Routes to β-Keto Amides." Current Organic Chemistry 23, no. 19 (December 19, 2019): 2005–15. http://dx.doi.org/10.2174/1385272823666191021120336.

Full text

Abstract:

This review summarizes the data published on the methods of preparation of β- keto amides as a versatile synthon for many heterocyclic rings and asymmetric urea derivatives. Based on the starting materials used for the synthesis of β-keto amides, eight methods were reported including β-keto acids and their derivatives, Meldrum’s acid and their derivatives, diketene, 2,6-dimethyl-1,3-dioxin-4-one derivatives (TMD), α-diazo ketones, enamines and enolates, acetamides and their derivatives and reduction of certain Passerini products.

APA, Harvard, Vancouver, ISO, and other styles

6

Hosseini-Tabatabaei, Mohammad Reza, Mohammad Reza Akhgar, Behnaz Rafieepour, Alireza Hassanabadi, Malek Taher Maghsoodlou, and Marjaneh Samadzadeh. "Three Component Synthesis of Substituted 4H-[1,3]Dioxin Derivatives Under Solvent-Free Conditions." E-Journal of Chemistry 9, no. 4 (2012): 1906–10. http://dx.doi.org/10.1155/2012/654509.

Full text

Abstract:

Reaction between aryl aldehydes, acetylacetone and alkyl isocyanides in solvent-free conditions provided a simple and efficient one-pot route for the synthesis of 1-(2-alkylamino-6-methyl-4-aryl-4H-[1,3]dioxin-5-yl)ethanone derivatives in excellent yields.

APA, Harvard, Vancouver, ISO, and other styles

7

Lin, Feng, Qiuling Song, Yuyu Gao, and Xiuling Cui. "A catalyst-free, facile and efficient approach to cyclic esters: synthesis of 4H-benzo[d][1,3]dioxin-4-ones." RSC Adv. 4, no. 38 (2014): 19856–60. http://dx.doi.org/10.1039/c4ra01651c.

Full text

Abstract:

A metal and additive free base-mediated method for the formation of 4H-benzo[d][1,3]dioxin-4-one and its derivatives, from salicylic acids and dichloromethane, was developed using dichloromethane (DCM) and 1,1-dichloroethane (1,1-DCE) as the C1 source.

APA, Harvard, Vancouver, ISO, and other styles

8

Talybov, G. M., and S. A. Musaeva. "HETEROCYCLIZATION OF ALLYL - IODOETHERS IN 1,4-DIOXANE DERIVATIVES." Chemical Problems 19, no. 1 (2021): 32–36. http://dx.doi.org/10.32737/2221-8688-2021-1-32-36.

Full text

Abstract:

Alkoxyiodination of 1-vinyl-4-organylbenzenes with 2-methyl-3-buten-1-ol and crystalline iodine in the presence of clinoptilolite (NaK) 4CaAl6Ci30O72 leads to allyl b-iodoethers in high yields which in the presence of heteropolyacids are converted into substituted 1,4 -dioxane.

APA, Harvard, Vancouver, ISO, and other styles

9

Böeseken, J., F. Tellegen, and P. Maltha. "Derivatives of dioxan. IV." Recueil des Travaux Chimiques des Pays-Bas 52, no. 12 (September 3, 2010): 1067–72. http://dx.doi.org/10.1002/recl.19330521212.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Pert, DJ, and DD Ridley. "Preparations of 2,4-Disubstituted Oestradiols." Australian Journal of Chemistry 42, no. 3 (1989): 421. http://dx.doi.org/10.1071/ch9890421.

Full text

Abstract:

2,4-Dibromoestra-1,3,S(10)-triene-3,17 β- diol 3-(2'-hydroxyethyl) ether (8) undergoes reaction with copper(11) chloride/sodium methoxide to afford a 4-bromo [2,3]- dioxan derivative (9) as the major product together with a minor amount of a 2-bromo [3,4]- dioxan derivative (10). These compounds were used to prepare a number of 2,4-disubstituted oestradiol derivatives. � Alternative routes to other 2,4-disubstituted oestradiols are described.

APA, Harvard, Vancouver, ISO, and other styles

11

Karad, Somnath Narayan, Wei-Kang Chung, and Rai-Shung Liu. "Gold-catalyzed formal [4π+2π]-cycloadditions of tert-butyl propiolates with aldehydes and ketones to form 4H-1,3-dioxine derivatives." Chemical Communications 51, no. 65 (2015): 13004–7. http://dx.doi.org/10.1039/c5cc04538j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Mojtahedi, Mohammad M., Masoomeh Mehraban, Kiana Darvishi, and M. Saeed Abaee. "Ultrasound mediated synthesis of dihydropyrano[3,2-d][1,3]dioxin-7-carbonitrile derivatives in H2O/EtOH medium." Heterocyclic Communications 23, no. 2 (April 1, 2017): 91–95. http://dx.doi.org/10.1515/hc-2017-0014.

Full text

Abstract:

AbstractA one-pot cyclocondensation of 1,3-dioxane-5-one (1) with malononitrile and aromatic aldehydes in aqueous sodium hydroxide under ultrasonic irradiation furnishes a series of pyrano[3,2-d][1,3]dioxin derivatives 3. Reactions are completed after a few minutes and the precipitated products are purified by simple crystallization from ethanol. The reaction with ethyl cyanoacetate instead of malononitrile gives the respective analogous products in high yields.

APA, Harvard, Vancouver, ISO, and other styles

13

Gautschi, Markus, W. Bernd Schweizer, and Dieter Seebach. "In 2- und 3-Stellung verzweigte, enantiomerenreine 4,4,4-Trifluor-3-hydroxy-buttersäure-Derivate aus 6-Trifluormethyl-1,3-dioxan-und -dioxin-4-onen." Chemische Berichte 127, no. 3 (March 1994): 565–79. http://dx.doi.org/10.1002/cber.19941270317.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Tellegen, F. Ph A. "Derivatives of 1,4-dioxan VII." Recueil des Travaux Chimiques des Pays-Bas 57, no. 6 (September 3, 2010): 667–72. http://dx.doi.org/10.1002/recl.19380570617.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Journal, Baghdad Science. "Synthesis, Characterization of Derivatives Tetrazoles for Trimethoprim Drug." Baghdad Science Journal 13, no. 2 (June 5, 2016): 266–74. http://dx.doi.org/10.21123/bsj.13.2.266-274.

Full text

Abstract:

The present work involved synthesis of serval new substituted tetrazole via Schiff bases for trimethoprim drug by two steps. The first step involved direct reaction of different ketones and aldehydes with trimethoprim producing the corresponding Schiff bases (1-10), whereas the second step, involved preparation new tetrazoles derivatives (11-20) through reaction of the ready Schiff bases (in the first step) with sodium azidein in dioxin. The prepared compounds were characterized by UV, FT-IR, and some of them by 13C-NMR, 1H-NMR spectroscopy and physical properties.

APA, Harvard, Vancouver, ISO, and other styles

16

Merica, Simona G., and Nigel J. Bunce. "Synthesis of nitropolychlorinated dibenzo-p-dioxins (NPCDDs) and their photochemical reaction with nucleophiles." Canadian Journal of Chemistry 73, no. 6 (June 1, 1995): 826–34. http://dx.doi.org/10.1139/v95-103.

Full text

Abstract:

A series of nitropolychlorodibenzo-p-dioxins (NPCDDs) was synthesized by condensation between catechols and 2,6-dinitrohalobenzene derivatives. In the presence of sodium ethoxide in anhydrous ethanol, these underwent photochemical SN2Ar* substitutions meta to the nitro group in high chemical yield and moderate quantum yield. Both ring-opening and chloride replacement reactions were observed. The reactions involved the triplet excited state of the NPCDD, and showed a linear relationship between Φ−1 and [nucleophile]−1. Analogous reactions with KCN in methanol showed similar behaviour, but the products could not be isolated. Keywords: photosubstitution, SN2Ar*, dibenzo-p-dioxins.

APA, Harvard, Vancouver, ISO, and other styles

17

Bosseray, Pascal, Gérard Coudert, Gérald Guillaumet, Georges Jeminet, Madeleine Tissier, and Jean Juillard. "Polyether carboxylic acids incorporating a benzodioxinic subunit: synthesis and complexing ability of sodium and potassium." Canadian Journal of Chemistry 70, no. 3 (March 1, 1992): 828–35. http://dx.doi.org/10.1139/v92-109.

Full text

Abstract:

We report here the synthesis of new polyoxygenated macrocyclic derivatives with a benzodioxinic subunit and a carboxylic side chain (2, 3), along with some of their corresponding acyclic polyethers (1). Formation constants of sodium and potassium complexes with both the acid and anion forms of these compounds were obtained from potentiometric measurements. The enhancement of both complexing ability and selectivity afforded by the presence of a carboxylic side chain is discussed. Keywords: polyether carboxylic acids, macrocycles, benzo-1,4-dioxin, sodium and potassium complexes, solvent methanol.

APA, Harvard, Vancouver, ISO, and other styles

18

Kovtun, A. V., S. A. Varenichenko, E. V. Zaliznaya, A. V. Mazepa, O. K. Farat, and V. I. Markov. "Rearrangement of spiroderivatives of 1,3-benzo(naphtho)dioxin-4(1)-ones as a new method of synthesis of xanthene bromo derivatives." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 4 (July 2021): 73–77. http://dx.doi.org/10.32434/0321-4095-2021-137-4-73-77.

Full text

Abstract:

We have proposed a method for the synthesis of previously unknown bromo xanthenes using the reagent PBr3/DMF as a rearrangement initiator. Bromo derivatives of xanthenes in the form of organic perchlorates were prepared by reacting the corresponding benzo(naphtho)dioxin-4(1)-ones with a three-fold excess of Vilsmeier-Haack PBr3/DMF reagent at 1100C for 2 hours, followed by the addition of sodium perchlorate. The conditions for the synthesis of formyl derivatives of xanthenes under conditions of acid hydrolysis were selected. The structure of the compounds was confirmed by 1H and 13C NMR spectral data and mass spectrometry. Preliminary studies showed that it is possible to selectively replace the dimethylamino group and the bromine atom with various nucleophiles in bromo derivatives of xanthenes, which opens up wide possibilities for the synthesis of low-molecular building blocks and dyes.

APA, Harvard, Vancouver, ISO, and other styles

19

Denisenko, Alexander, and Anton Tverdokhlebov. "Synthesis of masked 2-amino-6-methyl-4-oxo-4H-pyran-3-carbaldehydes." French-Ukrainian Journal of Chemistry 6, no. 1 (2018): 67–73. http://dx.doi.org/10.17721/fujcv6i1p67-73.

Full text

Abstract:

Acetoacetylation of (1,3-dimethylbenzimidazol-2-ylidene)-, (3-methylbenzothiazol-2-ylidene)-, and (3,4-dimethylthiazol-2-ylidene)acetonitriles with 2,2,6-trimethyl-4H-1,3-dioxin-4-one was found to yield appropriate C-acylation products. Treatment of the obtained products with perchloric acid afforded 2-(2-amino-6-methyl-4H-pyran-4-one-3-yl)substituted quaternary azolium salts. Their reduction with sodium borohydride yielded the corresponding dihydro (in the case of benzoazoles) or tetrahydro (in the case of thiazole) derivatives, which were shown to be synthetic equivalents of the title aldehyde.

APA, Harvard, Vancouver, ISO, and other styles

20

Singh, Sudhir K., and Subodh Kumar. "Synthesis of oxygenated derivatives of 2,3,7,8-tetrachlorodibenzo-p-dioxin." Journal of Agricultural and Food Chemistry 41, no. 9 (September 1993): 1511–16. http://dx.doi.org/10.1021/jf00033a030.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Javad Poursharifi, M., Mohammad M. Mojtahedi, M. Saeed Abaee, and Mohammad M. Hashemi. "The first in situ synthesis of 1,3-dioxan-5-one derivatives and their direct use in Claisen-Schmidt reactions." Heterocyclic Communications 25, no. 1 (May 31, 2019): 85–90. http://dx.doi.org/10.1515/hc-2019-0013.

Full text

Abstract:

AbstractA method is developed for in situ generation of 1,3-dioxan-5-one derivatives 2. These compounds are simple precursors for accessing carbohydrate structures and previously had to be produced via stepwise procedures using excessive amounts of reagents. In the present work, three different derivatives of 2 were synthesized via the reaction of trialkoxyalkanes with dihydroxyacetone dimer 1 in the presence of acetic acid as the catalyst. In the same pot, derivatives of 2 were reacted with aromatic aldehydes and 30 mol% of pyrrolidine to obtain high yields of the respective bischalcones 3 within short time periods.

APA, Harvard, Vancouver, ISO, and other styles

22

Abdel-Jalil, Raid, Syed Shah, Khalid Khan, and Wolfgang Voelter. "Stereospecific Synthesis of Chiral Tetrahydroquinoxaline, 2,3- Dihydrobenzo[ 1,4]dioxin and 2,3-Dihydro-naphtho[2,3-b][1,4]-dioxin Derivatives." Letters in Organic Chemistry 2, no. 3 (May 1, 2005): 238–41. http://dx.doi.org/10.2174/1570178053765320.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Kuszmann, J., and E. Gacsbaitz. "O-Benzylidene Derivatives of D-Arabinose Diethyl and Dipropyl Dithioacetal." Australian Journal of Chemistry 49, no. 3 (1996): 273. http://dx.doi.org/10.1071/ch9960273.

Full text

Abstract:

Benzylidenation of D-arabinose diethyl and dipropyl dithioacetals with α,α-dimethoxytoluene in the presence of p-toluenesulfonic acid has been studied in detail. Under kinetic control the two terminal dioxolan -type 4,5-O-(R)- and 4,5-O-(S)-benzylidene diastereomers are formed first which are in equilibrium with each other In the thermodynamic phase of the reaction the corresponding dioxan -type 3,5-O-(R)- benzylidene isomer is formed too, but all three monobenzylidene isomers are gradually converted into the four possible dioxolan -type 2,3 : 4,5-di-O benzylidene diastereomers . The dioxan -type 2,4:3,5-di-O-benzylidene isomer was present only in trace amounts. When benzaldehyde was used as reagent in the presence of hydrochloric acid or zinc chloride only the 2,3: 4,5-di-O-benzylidene diastereomers were formed. Partial hydrolysis of the dibenzylidene derivatives yielded the corresponding 2,3-O-benzylidene diastereomers. Structures, including the chirality of the benzylidene groups, were determined by n.m.r. spectroscopy. A mechanism suggested for the reaction was partially supported by equilibration studies.

APA, Harvard, Vancouver, ISO, and other styles

24

Zheng, Mei, Xiao-hong Li, Hong-ling Cui, and Rui-zhou Zhang. "Comparative Theoretical Studies on Several Energetic Substituted Dioxin-imidazole Derivatives." Chinese Journal of Chemical Physics 29, no. 3 (June 27, 2016): 349–57. http://dx.doi.org/10.1063/1674-0068/29/cjcp1506118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Siddiqui, Bina S., Nizam Uddin, and Sabira Begum. "Two new dioxin derivatives from the aerial parts ofLawsonia alba." Natural Product Research 23, no. 18 (December 15, 2009): 1740–45. http://dx.doi.org/10.1080/14786410802689580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Wahyuningsih, Tutik Dwi, and Yehezkiel Steven Kurniawan. "Synthesis of Dioxo-Dioxane and Dioxo-Dioxepane Ethyl Oleate Derivatives as Bio-Lubricant Base Stocks." Indonesian Journal of Chemistry 20, no. 3 (May 9, 2020): 503. http://dx.doi.org/10.22146/ijc.42317.

Full text

Abstract:

In this study, two novel compounds, i.e., ethyl 8-(3-octyl-5,6-dioxo-1,4-dioxan-2-yl)octanoate and ethyl 8-(3-octyl-5,7-dioxo-1,4-dioxepan-2-yl)octanoate were prepared from oleic acid as the starting material. Both compounds were obtained from the esterification of the ethyl 9,10-dihydroxyoctadecanoate with dicarboxylic acids in the presence of p-toluenesulfonic acid as a catalyst. The chemical structures of the synthesized products were confirmed by FTIR, 1H-NMR, and MS spectrometers. The bio-lubricant properties of the products, such as density, total acid number, total base number, and iodine value, were determined and the effect of the dioxane and dioxepane heterocyclic rings to their bio-lubricant properties was discussed. The esterification of ethyl 9,10-dihydroxyoctadecanoate with oxalic acid gave ethyl 8-(3-octyl-5,6-dioxo-1,4-dioxan-2-yl)octanoate compound in 93.9% yield, while the esterification of ethyl 9,10-dihydroxyoctadecanoate with malonic acid gave ethyl 8-(3-octyl-5,7-dioxo-1,4-dioxepan-2-yl)octanoate compound in 89.6% yield. The density and total base number of the products were close to the standard commercial lubricant values. Meanwhile, the total acid number and the iodine value of the ethyl 8-(3-octyl-5,6-dioxo-1,4-dioxan-2-yl)octanoate were smaller than the standard commercial lubricant, showing that this compound is a promising bio-lubricant in a real application.

APA, Harvard, Vancouver, ISO, and other styles

27

Szczepański, Jan, and Józef Heidt. "The S1 → Sn and T1→ TnAbsorption Spectra of Some Anthracene Derivatives." Zeitschrift für Naturforschung A 40, no. 8 (August 1, 1985): 849–58. http://dx.doi.org/10.1515/zna-1985-0808.

Full text

Abstract:

A method for the determination of excited state absorption cross section spectra with a laser flash spectrometer is demonstrated. In the region 405-660 nm the cross sections of seven aromatic compounds in not degased dioxan at room temperature have been determined. The data obtained for anthracene are compared with those of other authors.

APA, Harvard, Vancouver, ISO, and other styles

28

Florian, Maria, Monica Cîrcu, Loïc Toupet, Anamaria Terec, Ion Grosu, Yvan Ramondenc, Nicolae Dincă, and Gerard Plé. "Synthesis and stereochemistry of some new 1,3,5-tris(1,3-dioxan-2-yl)-benzene derivatives." Open Chemistry 4, no. 4 (December 1, 2006): 808–21. http://dx.doi.org/10.2478/s11532-006-0040-2.

Full text

Abstract:

AbstractThe synthesis and the stereochemistry of new 1,3,5-tris(1,3-dioxan-2-yl)-benzene derivatives are reported. The anancomeric structure and the axial orientation of the aryl group with respect to all 1,3-dioxane rings, and the cis-trans isomerism of some of the compounds are revealed. The data are supported by NMR investigations and by the molecular structure of one compound determined by single crystal X-ray diffractometry.

APA, Harvard, Vancouver, ISO, and other styles

29

Krikounova, Vitalia S., Ramadan Abuknesha, and Sergei A. Eremin. "Express Detection of Pentachlorophenol as Dioxins Precursor in Natural Water." Scientific World JOURNAL 2 (2002): 1132–37. http://dx.doi.org/10.1100/tsw.2002.209.

Full text

Abstract:

A rapid detection method for the pesticide pentachlorophenol (PCP) — polarization fluoroimmunoassay (PFIA) — in the dynamic range of 10–9,000 ppb was developed. PCP may form polychlorinated dibenzo-p-dioxins, making environmental monitoring of this compound an issue of great importance. In order to optimize the PFIA procedure, a number of fluorescein-labeled PCP derivatives and similar compounds (tracers) were synthesized, and the influence of their structure on PFIA characteristics was studied. Also, two antisera were tested in developing PFIA for PCP. The developed method is highly specific for PCP and can be used for its determination in water samples at a level down to 10 ppb. Total time of the assay for 10 samples is about 7 min. The assay provides a useful and a highly practical screening tool for the processing of large numbers of samples and for the preliminary estimation of potential dioxins contamination in water resources.

APA, Harvard, Vancouver, ISO, and other styles

30

Chiu, FCK, RTC Brownlee, and DR Phillips. "Cupric Ion Chelation Assisted Synthesis of N(α)-Protected N(ω)-Acridin-9-yl α,ω-Diamino Carboxylic Acids." Australian Journal of Chemistry 46, no. 8 (1993): 1207. http://dx.doi.org/10.1071/ch9931207.

Full text

Abstract:

The synthesis of Nα-protected Nω-acridin-9-yl derivatives of the α,w-diamino carboxylic acids ornithine and lysine is reported. Direct introduction of the acridin-9-yl moiety to the amino side chain of the free amino acid was achieved in methanol through temporary copper(II) chelation protection of the α-amino and carboxy groups. Nα-Fmoc protection was introduced by using N-(fluoren-9-ylmethoxycarbonyloxy)succinimide in aqueous dioxan.

APA, Harvard, Vancouver, ISO, and other styles

31

Buth, Jeffrey M., Peter O. Steen, Charles Sueper, Dylan Blumentritt, Peter J. Vikesland, William A. Arnold, and Kristopher McNeill. "Dioxin Photoproducts of Triclosan and Its Chlorinated Derivatives in Sediment Cores." Environmental Science & Technology 44, no. 12 (June 15, 2010): 4545–51. http://dx.doi.org/10.1021/es1001105.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Gastilovich, Elena A., Vasilii G. Klimenko, Nina V. Korol'kova, and Ravil' N. Nurmukhametov. "Optical spectra and photophysical properties of polychlorinated dibenzo-p-dioxin derivatives." Russian Chemical Reviews 69, no. 12 (December 31, 2000): 1037–56. http://dx.doi.org/10.1070/rc2000v069n12abeh000602.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Goryunov, L. I., V. D. Shteingartz, and I. Grobe. "Synthesis of Dimethylphosphorothiol Derivatives of Dibenzo-p-dioxin, Phenoxazine, and Phenoxathiyne." Russian Journal of Organic Chemistry 40, no. 5 (May 2004): 757–58. http://dx.doi.org/10.1023/b:rujo.0000043729.02916.27.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Storsberg, Joachim, Dieter Schollmeyer, and Helmut Ritter. "Route Towards New Heteroaromatic Benzo[1,4]dioxine Derivatives." Chemistry Letters 32, no. 2 (February 2003): 140–41. http://dx.doi.org/10.1246/cl.2003.140.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Liu, Xiang Dong, Yoko Murayama, Masanori Yamada, Motoyoshi Nomizu, Masaji Matsunaga, and Norio Nishi. "DNA aqueous solution used for dialytical removal and enrichment of dioxin derivatives." International Journal of Biological Macromolecules 32, no. 3-5 (September 2003): 121–27. http://dx.doi.org/10.1016/s0141-8130(03)00045-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Juhász, László, Tibor Docsa, Attila Brunyászki, Pál Gergely, and Sándor Antus. "Synthesis and glycogen phosphorylase inhibitor activity of 2,3-dihydrobenzo[1,4]dioxin derivatives." Bioorganic & Medicinal Chemistry 15, no. 12 (June 2007): 4048–56. http://dx.doi.org/10.1016/j.bmc.2007.03.084.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Reddy, V. Vikram, Donald G. Patterson, James Grainger, and J. Phillip Bowen. "A computational study of some dioxin derivatives using MMP2 force field method." Chemosphere 18, no. 1-6 (January 1989): 1005–8. http://dx.doi.org/10.1016/0045-6535(89)90228-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

GAUTSCHI, M., W. B. SCHWEIZER, and D. SEEBACH. "ChemInform Abstract: Preparation of Enantiomerically Pure 4,4,4-Trifluoro-3-hydroxy- butanoic Acid Derivatives, Branched in the 2- or 3-Position, from 6- Trifluoromethyl-1,3-dioxan- and -dioxin-4-ones." ChemInform 25, no. 29 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199429102.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Spassova, Maria K., Antonín Holý, and Milena Masojídková. "Ribonucleosides of 3-amino- and 3,5-diaminopyrazole-4-carboxylic acid and their open-chain analogues: Synthesis and reactions." Collection of Czechoslovak Chemical Communications 51, no. 7 (1986): 1512–31. http://dx.doi.org/10.1135/cccc19861512.

Full text

Abstract:

Bis(trimethylsilyl) derivative of ethyl 3-aminopyrazole-4-carboxylate (VI) and tris(trimethylsilyl) derivative of ethyl 3,5-diaminopyrazole-4-carboxylate (VII) on reaction with 2,3,5-tri-O-benzoyl-D-ribofuranolyl chloride and subsequent debenzoylation afforded the respective β-D-ribofuranosyl derivatives VIIIa and Xa. Their alkaline hydrolysis led to 1-(β-D-ribofuranosyl)-3-aminopyrazole-4-carboxylic acid (VIIIc) and 1-(β-D-ribofuranosyl)-3,5-diaminopyrazole-4-carboxylic acid (Xb). The esters VIIIa and Xa were not ammonolyzed under normal conditions. Contrary to nucleosidation of the silyl derivatives VI and VII, sodium salt of ethyl 3-aminopyrazole-4-carboxylate was alkylated with 4-chloromethyl-2,2-dimethyl-1,3-dioxolane (XI) or 5-(p-toluenesulfonyloxy)-1,3-dioxane (XVIIb) to give a mixture of the N-isomeric derivatives XIIIa, XIXa and XIIa, XVIIIa, respectively; sodium salt of the 3,5-diamino derivative V reacted with these synthons under formation of the corresponding compounds XIIIb and XXa. Subsequent alkaline and acid hydrolysis of XIIa and XIIIb gave the open-chain analogs of nucleosides XV and XVI. The N-(1,3-dioxan-5-yl) derivatives XVIIIc and XXa resisted acid hydrolysis, giving rise only to carboxylic acids XVIIIb and XXb.

APA, Harvard, Vancouver, ISO, and other styles

40

Tulaphol, Sarttrawut, Sond Bunsan, Ho Wen Chen, Nuttaporn Pimpha, Pummarin Khamdahsag, and Nurak Grisdanurak. "Capture of dioxin derivatives on activated carbons: breakthrough curve modelling and isotherm parameters." International Journal of Environment and Pollution 60, no. 1/2/3/4 (2016): 156. http://dx.doi.org/10.1504/ijep.2016.082111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Grisdanurak, Nurak, Pummarin Khamdahsag, Sond Bunsan, Nuttaporn Pimpha, Ho Wen Chen, and Sarttrawut Tulaphol. "Capture of dioxin derivatives on activated carbons: breakthrough curve modelling and isotherm parameters." International Journal of Environment and Pollution 60, no. 1/2/3/4 (2016): 156. http://dx.doi.org/10.1504/ijep.2016.10002953.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Gastilovich, E. A., V. G. Klimenko, N. V. Korol'kova, and R. N. Nurmukhametov. "ChemInform Abstract: Optical Spectra and Photophysical Properties of Polychlorinated Dibenzo-p-dioxin Derivatives." ChemInform 32, no. 22 (May 26, 2010): no. http://dx.doi.org/10.1002/chin.200122300.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Armengaud, Jean, Kenneth N. Timmis, and Rolf-Michael Wittich. "A Functional 4-Hydroxysalicylate/Hydroxyquinol Degradative Pathway Gene Cluster Is Linked to the Initial Dibenzo-p-Dioxin Pathway Genes inSphingomonas sp. Strain RW1." Journal of Bacteriology 181, no. 11 (June 1, 1999): 3452–61. http://dx.doi.org/10.1128/jb.181.11.3452-3461.1999.

Full text

Abstract:

ABSTRACT The bacterium Sphingomonas sp. strain RW1 is able to use dibenzo-p-dioxin, dibenzofuran, and several hydroxylated derivatives as sole sources of carbon and energy. We have determined and analyzed the nucleic acid sequence of a 9,997-bpHindIII fragment downstream of cistronsdxnA1A2, which encode the dioxygenase component of the initial dioxygenase system of the corresponding catabolic pathways. This fragment contains 10 colinear open reading frames (ORFs), apparently organized in one compact operon. The enzymatic activities of some proteins encoded by these genes were analyzed in the strain RW1 and, after hyperexpression, in Escherichia coli. The first three ORFs of the locus, designateddxnC, ORF2, and fdx3, specify a protein with a low homology to bacterial siderophore receptors, a polypeptide representing no significant homology to known proteins, and a putative ferredoxin, respectively.dxnD encodes a 69-kDa phenol monooxygenase-like protein with activity for the turnover of 4-hydroxysalicylate, anddxnE codes for a 37-kDa protein whose sequence and activity are similar to those of known maleylacetate reductases. The following gene, dxnF, encodes a 33-kDa intradiol dioxygenase which efficiently cleaves hydroxyquinol, yielding maleylacetate, the ketoform of 3-hydroxy-cis,cis-muconate. The heteromeric protein encoded by dxnGH is a 3-oxoadipate succinyl coenzyme A (succinyl-CoA) transferase, whereas dxnI specifies a protein exhibiting marked homology to acetyl-CoA acetyltransferases (thiolases). The last ORF of the sequenced fragment codes for a putative transposase. DxnD, DxnF, DxnE, DxnGH, and DxnI (the activities of most of them have also been detected in strain RW1) thus form a complete 4-hydroxysalicylate/hydroxyquinol degradative pathway. A route for the mineralization of the growth substrates 3-hydroxydibenzofuran and 2-hydroxydibenzo-p-dioxin inSphingomonas sp. strain RW1 thus suggests itself.

APA, Harvard, Vancouver, ISO, and other styles

44

Halmann, M., A. N. Nkansah, M. Peretz, A. K. Singh, D. Vofsi, and S. Yanai. "Phosphonic acid derivatives of 1,3-dioxan: Potential plant growth regulators." Plant Growth Regulation 4, no. 3 (1986): 247–57. http://dx.doi.org/10.1007/bf00028168.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Yiğit, Deniz, Tuğba Güngör, and Mustafa Güllü. "Poly(thieno[3,4-b][1,4]dioxine) and poly([1,4]dioxino[2,3-c]pyrrole) derivatives: p- and n-dopable redox-active electrode materials for solid state supercapacitor applications." Organic Electronics 14, no. 12 (December 2013): 3249–59. http://dx.doi.org/10.1016/j.orgel.2013.09.037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Sulea, T., L. Kurunczi, and Z. Simon. "Dioxin-Type Activity for Polyhalogenated Arylic Derivatives. A QSAR Model Based on MTD-Method." SAR and QSAR in Environmental Research 3, no. 1 (May 1, 1995): 37–61. http://dx.doi.org/10.1080/10629369508233992.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Anger, Cale T., Charles Sueper, Dylan J. Blumentritt, Kristopher McNeill, Daniel R. Engstrom, and William A. Arnold. "Quantification of Triclosan, Chlorinated Triclosan Derivatives, and their Dioxin Photoproducts in Lacustrine Sediment Cores." Environmental Science & Technology 47, no. 4 (February 4, 2013): 1833–43. http://dx.doi.org/10.1021/es3045289.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Cambie, Richard C., George R. Clark, Sheryl L. Coombe, Sally A. Coulson, Peter S. Rutledge, and Paul D. Woodgate. "Towards the synthesis of amino[b,e][1,4]dioxin derivatives via cationic ruthenium complexes." Journal of Organometallic Chemistry 507, no. 1-2 (January 1996): 1–21. http://dx.doi.org/10.1016/0022-328x(95)05717-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Weidlich, Tomáš. "The Influence of Copper on Halogenation/Dehalogenation Reactions of Aromatic Compounds and Its Role in the Destruction of Polyhalogenated Aromatic Contaminants." Catalysts 11, no. 3 (March 14, 2021): 378. http://dx.doi.org/10.3390/catal11030378.

Full text

Abstract:

The effect of copper and its compounds on halogenation and dehalogenation of aromatic compounds will be discussed in the proposed article. Cu oxidized to appropriate halides is an effective halogenation catalyst not only for the synthesis of halogenated benzenes or their derivatives as desired organic fine chemicals, but is also an effective catalyst for the undesirable formation of thermodynamically stable and very toxic polychlorinated and polybrominated aromatic compounds such as polychlorinated biphenyls, dibenzo-p-dioxins and dibenzofurans accompanied incineration of waste contaminated with halogenated compounds or even inorganic halides. With appropriate change in reaction conditions, copper and its alloys or oxides are also able to effectively catalyze dehalogenation reactions, as will be presented in this review.

APA, Harvard, Vancouver, ISO, and other styles

50

Eduljee, Gev. "Secondary exposure to dioxins through exposure to PCP and its derivatives." Science of The Total Environment 232, no. 3 (August 1999): 193–214. http://dx.doi.org/10.1016/s0048-9697(99)00089-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!