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Artículos de revistas sobre el tema "Dioxanne"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 17 de febrero de 2022

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1

Majewski, Marek, D. Mark Gleave, and Pawel Nowak. "1,3-Dioxan-5-ones: synthesis, deprotonation, and reactions of their lithium enolates." Canadian Journal of Chemistry 73, no. 10 (1995): 1616–26. http://dx.doi.org/10.1139/v95-201.

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A general synthetic route to 2-alkyl- and 2,2-dialkyl-1,3-dioxan-5-ones, using tris(hydroxymethyl)-nitromethane as the starting material, is described. Deprotonation of these compounds was studied. It was established that these dioxanones could be deprotonated with LDA; however, the reduction of the carbonyl group via a hydride transfer from LDA, giving the corresponding dioxanols, often competed with deprotonation. The reduction could be minimized by using Corey's internal quench procedure to form silyl enol ethers and was less pronounced in 2,2-dialkyldioxanones (ketals) than in 2-alkyldioxa

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2

Durant, F., and M. Griffé. "Structure Cristalline Du Chlorure De Lithium Dioxanne-1,4 Monohydrate: LiCl.C4H8O2. H2O." Bulletin des Sociétés Chimiques Belges 77, no. 11-12 (2010): 557–67. http://dx.doi.org/10.1002/bscb.19680771104.

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3

van Coppernolle, A., J. P. Declercq, J. M. Dereppe, G. Germain, and M. van Meerssche. "Structures des Phényl-5 et Éthyl-5 Diméthyl-2,2 Dioxanne-1,3 Dione-4,6." Bulletin des Sociétés Chimiques Belges 88, no. 4 (2010): 223–26. http://dx.doi.org/10.1002/bscb.19790880405.

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4

Crozet, Michel P., Gaëlle Archaimbault, Patrice Vanelle, and Robert Nouguier. "Reactions SRN1 en serie heterocyclique: IV: Reactivite des sels du dimethyl-2,2 nitro-5 dioxanne-1,3." Tetrahedron Letters 26, no. 42 (1985): 5133–34. http://dx.doi.org/10.1016/s0040-4039(00)98882-8.

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5

Macau, J., and L. Lamberts. "Conductivité électrique Du Picrate De N-Butylammonium Dans Les Mélanges Eau Ou Alcool-Dioxanne Et Nitrobenzène-Benzène." Bulletin des Sociétés Chimiques Belges 80, no. 5-6 (2010): 551–62. http://dx.doi.org/10.1002/bscb.19710800525.

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6

Venkatesha, N. J., Y. S. Bhat, and B. S. Jai Prakash. "Dealuminated BEA zeolite for selective synthesis of five-membered cyclic acetal from glycerol under ambient conditions." RSC Advances 6, no. 23 (2016): 18824–33. http://dx.doi.org/10.1039/c6ra01437b.

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BEA zeolite is modified using phenoldisulfonic acid to change catalyst characteristics, which helps to form a single cyclic product. A new term called volume space acidity (VSA) provides volume space available for dioxane to dioxalane rearrangement.

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7

Zhong, Guo Lun, Yu Jiao Jiang, Rong Li, Fei Chen, Hong Lei Mao, and Yong Hong Wang. "Preparation and Optical Properties of Poly[3,4-Bis-(1,3-Dioxane-2-Ylethyl)] Thiophene." Advanced Materials Research 391-392 (December 2011): 1423–26. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1423.

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A new polythiophene derivative, poly[3,4-bis-(1,3-dioxane-2-ylethyl) thiophene] (PBDT) with two 1,3-dioxane groups was synthesized via two-step strategy. Firstly, a precursor polymer poly(3,4-dibromothiophene) (PDBrT) was prepared, and secondly the bromo-atoms were substituted by 1,3-dioxan-2-ylethyl groups to get the target polymer. The later reaction was monitored by FTIR spectroscopy. Molecular weights of PBDT were measured by GPC. In addition, the optical absorption and photoluminescence (PL) of PBDT and PDBrT were investigated and demonstrated that the maximum emission wavelength of PBDT

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8

Kuhn, Norbert, Ahmed Al Sheikh, and Manfred Steimann. "Synthesis and Structure of a Zwitterionic Imidazolium 1,3-Dioxanide." Zeitschrift für Naturforschung B 58, no. 8 (2003): 817–19. http://dx.doi.org/10.1515/znb-2003-0818.

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{Bis(methylthio)methylene}-2,2-dimethyl-4,6-dioxo-1,3- dioxane (7) reacts with cis-1,2-diamino-1,2-dicyanoethene to give 2,2-dimethyl-4,6-dioxo-5-{2-(4,5-dicyano)} imidazolio-1,3-dioxan-5-yl-imidazolium ylide (8) as a stable crystalline solid in good yield. The crystal structure of 8 × C3H6OS is discussed.

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9

M'Halla, J., and S. M'Halla. "Étude densimétrique et calorimétrique des systèmes binaires et ternaires (eau/dioxanne/NaB(Ph)4). Effet “clathrate" et solvatation préférentielle de B(Ph)4-." Journal de Chimie Physique et de Physico-Chimie Biologique 96, no. 8 (1999): 1450–78. http://dx.doi.org/10.1051/jcp:1999221.

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10

Durant, F., Y. Gobillon, P. Piret, and M. van Meerssche. "Étude par Diffraction de Rayons X de Complexes D'Halogénures Alcalins et de Molécules Organiques. V. Structure du Complexe Chlorure du Lithium. Dioxanne-1,4." Bulletin des Sociétés Chimiques Belges 75, no. 1-2 (2010): 52–69. http://dx.doi.org/10.1002/bscb.19660750106.

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11

Juaristi, Eusebio, G. A. Rosquete-Pina, M. Vázquez-Hernández, and A. J. Mota. "Salt effects on the conformational behavior of 5-substituted 1,3-dioxanes." Pure and Applied Chemistry 75, no. 5 (2003): 589–99. http://dx.doi.org/10.1351/pac200375050589.

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Since their introduction by E. L. Eliel nearly four decades ago, derivatives of 1,3-dioxane have proved useful in conformational analysis. Examples are discussed, where 5-polar substituents permit the evaluation of fundamental phenomena such as attractive and repulsive gauche effects, electrostatic interactions, and stereoelectronic effects. By the same token, 2-substituted 1,3-dioxanes, 1,3-dithianes, and 1,3-oxathianes are useful frameworks for the study of the anomeric effect and the associated structural and spectroscopic manifestations, such as the so-called Perlin effects. In view of the

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12

Raskil’dina, Gul’nara Z., Evgeniya A. Yakovenko, Luisa M. M. Mryasova, and Simon S. Zlotskii. "SYNTHESIS AND HERBICID ACTIVITY OF ARYLOXYACETIC ACIDS AND AMIDES OF ARYLOXY ACETIC ACIDS CONTAINING CYCLOACETAL FRAGMENT." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 1 (2018): 91–97. http://dx.doi.org/10.6060/ivkkt.20196201.5753.

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The herbicidal activity of esters and amides based on commercially available phenoxy chlorides and 2,4-dichlorophenoxyacetic acids was studied. Esters of 2,2-methyl-4-hydroxymethyl-1,3-dioxolane, 5-ethyl-5-hydroxymethyl-1,3-dioxane and 1,3-dioxolan-4-ylmethanol and 1,3-dioxane-5 -ol (glycerin formulas), as well as amides containing gem-dichlorocyclopropane and 1,3-dioxolane fragments were obtained. The acid chlorides, 1,3-dioxacycloalkanes and secondary amines were prepared according to standard basic methods. Esters and amides were synthesized from these starting compounds in a short time and

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13

Florian, Maria, Monica Cîrcu, Loïc Toupet, et al. "Synthesis and stereochemistry of some new 1,3,5-tris(1,3-dioxan-2-yl)-benzene derivatives." Open Chemistry 4, no. 4 (2006): 808–21. http://dx.doi.org/10.2478/s11532-006-0040-2.

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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.

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14

Al-Sheikh, Ahmad, Kamal Sweidan, Bassam Sweileh, Manfred Steimann, Hartmut Schubert, and Norbert Kuhn. "Synthesis and Crystal Structure of Triethylammonium 5-[(2,2-Dimethyl- 4,6-dioxo-1,3-dioxan-5-ylidene)(methylthio) methyl]-1,3-dimethylpyrimidine- 2,4,6-trionate." Zeitschrift für Naturforschung B 63, no. 8 (2008): 1020–22. http://dx.doi.org/10.1515/znb-2008-0817.

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Triethylammonium 5-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan- 5-ylidene)(methylthio)methyl]-1,3-dimethylpyrimidine- 2,4,6-trionate (6) is obtained as red-orange stable crystals by reaction of 5-[bis(methylthio)methylene]-2,2-dimethyl- 1,3-dioxane-4,6-dione (5) with 1,3-dimethylbarbituric acid (2) in the presence of triethylamine in excellent yield. The crystal structure of 6 confirms the negative charge to be localized at the barbituric-acid ring in its enolate form.

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15

Grygorenko, Oleksandr, Andriy Bondarenko, Andrey Tolmachev, and Bohdan Vashchenko. "Synthesis of Functionalized 1,4-Dioxanes with an Additional (Hetero)Aliphatic Ring." Synthesis 50, no. 18 (2018): 3696–707. http://dx.doi.org/10.1055/s-0037-1610195.

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An approach to the preparation of 2-mono-, 2,2- and 2,3-disubstituted 1,4-dioxane derivatives is described. The reaction sequence commences from readily available epoxides, in most cases prepared via the Corey–Chaikovsky reaction of the corresponding aldehydes and ketones. The key step of the method is epoxide ring opening with ethylene glycol monosodium salt, followed by further cyclization of the diols obtained. The utility of the approach was demonstrated by multigram preparation of novel functionalized 1,4-dioxanes bearing additional cycloalkane, piperidine or pyrrolidine rings, mostly spi

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16

Kuhn, Norbert, Ahmed Al-Sheikh, and Manfred Steimann. "2-Amino-1,3-dimethylimidazolium 2,2-Dimethyl-4,6-dioxo-1,3-dioxanide. First Structural Characterisation of the Anion of Meldrum’s Acid [1]." Zeitschrift für Naturforschung B 58, no. 5 (2003): 481–84. http://dx.doi.org/10.1515/znb-2003-0519.

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2-Amino-1,3-dimethylimidazolium 2,2-dimethyl- 4,6-dioxo-1,3-dioxanide (6) has been obtained from the reaction of 2,2-dimethyl-4,6-dioxo-1,3- dioxan (1, “Meldrum’s acid”) and 2-imino-1,3-dimethylimidazoline (5) in excellent yield. The unit cell of 6 contains two crystallographically independent anions lying on crystallographic mirror planes. The structure of the anion is compared with that of compound 1.

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17

Castro, E. A., J. M. Romero, N. L. Jorge, and J. M. Gomez-Vara. "Theoretical density functional study of substituted dioxanes: trans 3,6-dimethoxy-1,2-dioxane." Arkivoc 2003, no. 15 (2003): 1–9. http://dx.doi.org/10.3998/ark.5550190.0004.f01.

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18

Campi, EM, WR Jackson, P. Perlmutter, and EE Tasdelen. "The Stereochemistry of Organometallic Compounds. XXXIX. Hydroformylation of Alkenes Containing Sulfur and Oxygen Substituents: a Potential Route to 1,4-Dialdehydes." Australian Journal of Chemistry 46, no. 7 (1993): 995. http://dx.doi.org/10.1071/ch9930995.

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Rhodium-catalysed hydroformylation of a series of unsaturated thioethers, dithians , dioxans and dioxolans has been shown to give aldehydes in very good yield. The regioselectivity in some cases appears to be influenced by coordination between the rhodium catalyst and the sulfur substituent especially when dodecacarbonyltetrarhodium is used as the catalyst precursor. At tempts to convert dithian and dioxan aldehydes into 1,4-dialdehydes were unsuccessful.

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19

Y. K. Meshram, Y. K. Meshram, K. N. Sonune K.N.Sonune, and Rohinee R. Dharamkar. "Studies of Acoustic Properties of Substituted Heterocyclic Drugs in Dioxane & Dioxane-Water Mixture At 290C." Indian Journal of Applied Research 4, no. 7 (2011): 75–78. http://dx.doi.org/10.15373/2249555x/july2014/20.

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20

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 (2020): 503. http://dx.doi.org/10.22146/ijc.42317.

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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 iodi

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21

Grostern, Ariel, Christopher M. Sales, Wei-Qin Zhuang, Onur Erbilgin, and Lisa Alvarez-Cohen. "Glyoxylate Metabolism Is a Key Feature of the Metabolic Degradation of 1,4-Dioxane by Pseudonocardia dioxanivorans Strain CB1190." Applied and Environmental Microbiology 78, no. 9 (2012): 3298–308. http://dx.doi.org/10.1128/aem.00067-12.

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ABSTRACTThe groundwater contaminant 1,4-dioxane (dioxane) is transformed by several monooxygenase-expressing microorganisms, but only a few of these, includingPseudonocardia dioxanivoransstrain CB1190, can metabolize the compound as a sole carbon and energy source. However, nothing is yet known about the genetic basis of dioxane metabolism. In this study, we used a microarray to study differential expression of genes in strain CB1190 grown on dioxane, glycolate (a previously identified intermediate of dioxane degradation), or pyruvate. Of eight multicomponent monooxygenase gene clusters carrie

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22

Lee, Kang Hoon, Young Min Wie, and Yong-Soo Lee. "Characterization of 1,4-Dioxane Biodegradation by a Microbial Community." Water 12, no. 12 (2020): 3372. http://dx.doi.org/10.3390/w12123372.

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In this study, a microbial community of bacteria was investigated for 1,4-dioxane(1,4-D) biodegradation. The enriched culture was investigated for 1,4-dioxane mineralization, co-metabolism of 1,4-dioxane and extra carbon sources, and characterized 1,4-dioxane biodegradation kinetics. The mineralization test indicates that the enriched culture was able to degrade 1,4-dioxane as the sole carbon and energy source. Interestingly, the distribution of 1,4-dioxane into the final biodegrading products were 36.9% into biomass, 58.3% completely mineralized to CO2, and about 4% escaped as VOC. The enrich

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23

Guan, Xiangyu, Fei Liu, Jing Wang, Caoxiang Li, and Xiaoxuan Zheng. "Mechanism of 1,4-dioxane microbial degradation revealed by 16S rRNA and metatranscriptomic analyses." Water Science and Technology 77, no. 1 (2017): 123–33. http://dx.doi.org/10.2166/wst.2017.498.

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Abstract 1,4-Dioxane (dioxane), a probable human carcinogen, often exists in industrial wastewater and domestic sewage. In this study, we applied 16S rRNA and metatranscriptomic methods to analyze the dioxane biodegradation mechanism by activated sludge. Tetrahydrofuran (THF) was added as an essential co-metabolite to promote the degradation of dioxane. We found the dioxane removal ratio increased with increasing THF concentrations. When the THF concentration increased from 60.0 to 200.0 mg/L, the dioxane degradation rate was stable. Three additions of ∼60.0 mg/L THF resulted in better dioxane

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24

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.

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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.

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25

Gedalanga, Phillip B., Peerapong Pornwongthong, Rebecca Mora, et al. "Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane." Applied and Environmental Microbiology 80, no. 10 (2014): 3209–18. http://dx.doi.org/10.1128/aem.04162-13.

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ABSTRACTBacterial multicomponent monooxygenase gene targets inPseudonocardia dioxanivoransCB1190 were evaluated for their use as biomarkers to identify the potential for 1,4-dioxane biodegradation in pure cultures and environmental samples. Our studies using laboratory pure cultures and industrial activated sludge samples suggest that the presence of genes associated with dioxane monooxygenase, propane monooxygenase, alcohol dehydrogenase, and aldehyde dehydrogenase are promising indicators of 1,4-dioxane biotransformation; however, gene abundance was insufficient to predict actual biodegradat

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26

Cambie, RC, KC Higgs, JJ Rustenhoven, and PS Rutledge. "Experiments Directed Towards the Synthesis of Anthracyclinones. XXIX. Fluoro-Substituted Tetracycles." Australian Journal of Chemistry 49, no. 7 (1996): 751. http://dx.doi.org/10.1071/ch9960751.

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Diastereoselective formation of 9-fluoro-9-methylanthracyclinones has been achieved by treating ortho-methallyl-substituted anthraquinonyl homochiral dioxans with boron trifluoride etherate . The demethoxy anthraquinonyl dioxan (16) underwent slow reaction to give exclusively the (7S,9R) fluoro tetracycle (21) in 58% yield. The dimethoxy anthraquinonyl dioxan (15) was less reactive, allowing other reactions to compete, but boron trifluoride -acetic acid complex effected rapid cyclization of (15) with high diastereoselectivity. Short reaction times with this reagent circumvented the formation o

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27

Polacki, Zenon, and Janusz Rak. "Theoretical Approach in Explanation of Energy Donor Properties of 1,4-Dioxane and 1,4-Dioxane-Water Complexes." Zeitschrift für Naturforschung A 43, no. 7 (1988): 621–26. http://dx.doi.org/10.1515/zna-1988-0702.

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Abstract The CNDO/2 CI method was used for the examination of 1,4-dioxane and 1,4-dioxane-water complexes (2:1), taking into account various conformations of the dioxane molecule. The energies of the molecules in the ground and excited states, the energies of hydrogen bond formation, the dipole moments, the transition moments, and the oscillator strengths for both the complexed and isolated 1,4-dioxane molecules were evaluated. The results of these studies are used to reveal the influence of water on the features of energy transfer from excited, by y-radiation, 1,4-dioxane or dioxane-water com

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28

Choi, Moon-Seop, Ki-Seung Choi, and Kye-Heon Oh. "Effects of Several Physicochemical Factors on the Biodegradation of 1,4-Dioxane by Microbial Consortium CDIK-3 Enriched from Industrial Wastewater." Journal of Korean Society of Environmental Engineers 42, no. 8 (2020): 381–92. http://dx.doi.org/10.4491/ksee.2020.42.8.381.

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Objective : With the ultimate aim of application for effluent treatment, the relationships between 1,4-dioxane degradation by microbial consortium CDIK-3 and several relevant physicochemical environmental parameters were investigated.Methods : Microbial consortium CDIK-3 enriched from an industrial wastewater sample developed to grow aerobically with 1,4-dioxane as the sole carbon substrate was used to evaluate the degradation of 1,4-dioxane depending on the various environmental parameters and HPLC methodology was used to measure residual 1,4-dioxane in the test consortium.Results and Discuss

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29

Tusher, Tanmoy Roy, Takuya Shimizu, Chihiro Inoue, and Mei-Fang Chien. "Enrichment and Analysis of Stable 1,4-dioxane-Degrading Microbial Consortia Consisting of Novel Dioxane-Degraders." Microorganisms 8, no. 1 (2019): 50. http://dx.doi.org/10.3390/microorganisms8010050.

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Biodegradation of 1,4-dioxane, a water contaminant of emerging concern, has drawn substantial attention over the last two decades. A number of dioxane-degraders have been identified, though many of them are unable to metabolically utilize 1,4-dioxane. Moreover, it is considered more preferable to use microbial consortia rather than the pure strains, especially in conventional bioreactors for industrial wastewater treatment. In the present study, a stable 1,4-dioxane-degrading microbial consortium was enriched, namely 112, from industrial wastewater by nitrate mineral salt medium (NMSM). The co

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30

Tian, Gui-Peng, Qian-Yuan Wu, Ang Li, Wen-Long Wang, and Hong-Ying Hu. "Enhanced decomposition of 1,4-dioxane in water by ozonation under alkaline condition." Water Science and Technology 70, no. 12 (2014): 1934–40. http://dx.doi.org/10.2166/wst.2014.414.

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1,4-Dioxane is a probable human carcinogenic and refractory substance that is widely detected in aquatic environments. Traditional wastewater treatment processes, including activated sludge, cannot remove 1,4-dioxane. Removing 1,4-dioxane with a reaction kinetic constant of 0.32 L/(mol·s) by using ozone, a strong oxidant, is difficult. However, under alkaline environment, ozone generates a hydroxyl radical (•OH) that exhibits strong oxidative potential. Thus, the ozonation of 1,4-dioxane in water under different pH conditions was investigated in this study. In neutral solution, with an inlet o

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31

Lee, Kang Hoon, Young Min Wie, Deokjin Jahng, and Ick Tae Yeom. "Effects of Additional Carbon Sources in the Biodegradation of 1,4-Dioxane by a Mixed Culture." Water 12, no. 6 (2020): 1718. http://dx.doi.org/10.3390/w12061718.

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A mixed culture utilizing 1,4-dioxane as a sole carbon and energy source was obtained from the activated sludge at a textile wastewater treatment plant. The biodegradation of 1,4-dioxane was characterized by a model based on the Monod equation. The effects of the presence of easily degradable carbon sources other than 1,4-dioxane were investigated using dextrose. Structural analogs commonly found in 1,4-dioxane-containing wastewater such as tetrahydrofuran (THF), 2-methyl-1,3-dioxolane, and 1,4-dioxene were also evaluated for their potential effects on 1,4-dioxane biodegradation. The presence

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32

Rahman, Nafisur, and Sk Manirul Haque. "Optimized and Validated Spectrophotometric Methods for the Determination of Enalapril Maleate in Commercial Dosage Forms." Analytical Chemistry Insights 3 (January 2008): ACI.S643. http://dx.doi.org/10.4137/aci.s643.

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Four simple, rapid and sensitive spectrophotometric methods have been proposed for the determination of enalapril maleate in pharmaceutical formulations. The first method is based on the reaction of carboxylic acid group of enalapril maleate with a mixture of potassium iodate (KIO3) and iodide (KI) to form yellow colored product in aqueous medium at 25 ± 1°C. The reaction is followed spectrophotometrically by measuring the absorbance at 352 nm. The second, third and fourth methods are based on the charge transfer complexation reaction of the drug with p-chloranilic acid (pCA) in 1, 4-dioxan-me

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33

Mamleev, A. Kh, L. N. Gunderova, R. V. Galeev, et al. "Structure and spectra of 1,3-dioxanes. microwave spectrum, structural parameters and ab initio calculations of 1,3-dioxane." Journal of Structural Chemistry 48, no. 3 (2007): 456–61. http://dx.doi.org/10.1007/s10947-007-0068-y.

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34

Han, J. S., M. H. So, and C. G. Kim. "Optimization of biological wastewater treatment conditions for 1,4-dioxane decomposition in polyester manufacturing processes." Water Science and Technology 59, no. 5 (2009): 995–1002. http://dx.doi.org/10.2166/wst.2009.079.

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The solvent stabilizer 1,4-dioxane could have harmful effects on an ecosystem. The discharge limit of 1,4-dioxane in a body of water will be regulated at 5 mg/L in Republic of Korea. Thus, the currently operating activated sludge used in the manufacture of polyester should be properly treated to meet the regulations. Accordingly, the removal rate of 1,4-dioxane and its microbial properties was assessed at K, H and T corporations. The highest removal efficiencies were recorded at H. However, the concentration of 1,4-dioxane in the effluent of T exceeded the criterion. In addition, a microbial d

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35

Wang, Quyuan, Runtian He, Jing Xu, and Fangming Jin. "Removal of 1,4-Dioxane from Wastewater by Copper Oxide Catalyzed WAO with Mild Condition." E3S Web of Conferences 233 (2021): 01131. http://dx.doi.org/10.1051/e3sconf/202123301131.

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1,4-Dioxane is a contaminant of emerging concern that is classified by the U.S. Environmental Protection Agency as a likely human carcinogen. Moreover, 1,4-dioxane easily migrates to groundwater due to its high solubility in water and hard to be biodegraded or removed by traditional water treatment technology. Therefore, it is indispensable to develop new methods and technologies to dispose of 1,4-dioxane in the wastewater. Herein, this study presented catalytic wet air oxidation (CWAO) with CuO as a catalyst and O2 as an oxidant to treat 1,4-dioxane and investigated the influence of reaction

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36

Black, Roderick E., Fred J. Hurley, and Donald C. Havery. "Occurrence of 1,4-Dioxane in Cosmetic Raw Materials and Finished Cosmetic Products." Journal of AOAC INTERNATIONAL 84, no. 3 (2001): 666–70. http://dx.doi.org/10.1093/jaoac/84.3.666.

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Abstract Surveys of cosmetic raw materials and finished products for the presence of the carcinogen 1,4-dioxane have been conducted by the U.S. Food and Drug Administration since 1979. Analytical methods are described for the determination of 1,4-dioxane in ethoxylated cosmetic raw materials and cosmetic finished products. 1,4-Dioxane was isolated by azeotropic atmospheric distillation and determined by gas chromatography using n-butanol as an internal standard. A solid-phase extraction procedure based on a previously published method for the determination of 1,4-dioxane in cosmetic finished p

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37

Gärtner, Martin, Helmar Görls та Matthias Westerhausen. "Poly[[μ-dioxane-κ2O:O′-dioxane-κO-μ-diphenylamido-κ2N:N-potassium] dioxane solvate]". Acta Crystallographica Section E Structure Reports Online 63, № 9 (2007): m2287—m2288. http://dx.doi.org/10.1107/s1600536807037427.

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38

Nakamiya, Kunichika, Syunji Hashimoto, Hiroyasu Ito, John S. Edmonds, and Masatoshi Morita. "Degradation of 1,4-Dioxane and Cyclic Ethers by an Isolated Fungus." Applied and Environmental Microbiology 71, no. 3 (2005): 1254–58. http://dx.doi.org/10.1128/aem.71.3.1254-1258.2005.

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ABSTRACT By using 1,4-dioxane as the sole source of carbon, a 1,4-dioxane-degrading microorganism was isolated from soil. The fungus, termed strain A, was able to utilize 1,4-dioxane and many kinds of cyclic ethers as the sole source of carbon and was identified as Cordyceps sinensis from its 18S rRNA gene sequence. Ethylene glycol was identified as a degradation product of 1,4-dioxane by the use of deuterated 1,4-dioxane-d 8 and gas chromatography-mass spectrometry analysis. A degradation pathway involving ethylene glycol, glycolic acid, and oxalic acid was proposed, followed by incorporation

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39

Tian, Gui-Peng, Qian-Yuan Wu, Ang Li, Wen-Long Wang, and Hong-Ying Hu. "Promoted ozonation for the decomposition of 1,4-dioxane by activated carbon." Water Supply 17, no. 2 (2016): 613–20. http://dx.doi.org/10.2166/ws.2016.071.

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Worldwide attention has been attracted to 1,4-dioxane because of its probable human carcinogenicity and frequent occurrence in surface waters and wastewaters. Thus, many countries and organizations have set limits for the amount of this material in drinking water and wastewater effluent. However, the removal of 1,4-dioxane during traditional treatment processes, even ozonation (pH &lt; 7), has been limited. Therefore, 1,4-dioxane removal during catalytic ozonation was investigated in this study, and activated carbon was selected as the ideal catalyst. The removal efficiency of 1,4-dioxane

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40

Sales, Christopher M., Ariel Grostern, Juanito V. Parales, Rebecca E. Parales, and Lisa Alvarez-Cohen. "Oxidation of the Cyclic Ethers 1,4-Dioxane and Tetrahydrofuran by a Monooxygenase in Two Pseudonocardia Species." Applied and Environmental Microbiology 79, no. 24 (2013): 7702–8. http://dx.doi.org/10.1128/aem.02418-13.

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ABSTRACTThe bacteriumPseudonocardia dioxanivoransCB1190 grows on the cyclic ethers 1,4-dioxane (dioxane) and tetrahydrofuran (THF) as sole carbon and energy sources. Prior transcriptional studies indicated that an annotated THF monooxygenase (THF MO) gene cluster,thmADBC, located on a plasmid in CB1190 is upregulated during growth on dioxane. In this work, transcriptional analysis demonstrates that upregulation ofthmADBCoccurs during growth on the dioxane metabolite β-hydroxyethoxyacetic acid (HEAA) and on THF. Comparison of the transcriptomes of CB1190 grown on THF and succinate (an intermedi

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41

Vainberg, Simon, Kevin McClay, Hisako Masuda, et al. "Biodegradation of Ether Pollutants by Pseudonocardia sp. Strain ENV478." Applied and Environmental Microbiology 72, no. 8 (2006): 5218–24. http://dx.doi.org/10.1128/aem.00160-06.

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ABSTRACT A bacterium designated Pseudonocardia sp. strain ENV478 was isolated by enrichment culturing on tetrahydrofuran (THF) and was screened to determine its ability to degrade a range of ether pollutants. After growth on THF, strain ENV478 degraded THF (63 mg/h/g total suspended solids [TSS]), 1,4-dioxane (21 mg/h/g TSS), 1,3-dioxolane (19 mg/h/g TSS), bis-2-chloroethylether (BCEE) (12 mg/h/g TSS), and methyl tert-butyl ether (MTBE) (9.1 mg/h/g TSS). Although the highest rates of 1,4-dioxane degradation occurred after growth on THF, strain ENV478 also degraded 1,4-dioxane after growth on s

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42

Deng, Kui Lin, Wen Hui Jin, Fu Chen Zhang, et al. "Preparation and Characterization of Dioxanone and Poly(dioxanone)." Advanced Materials Research 711 (June 2013): 22–25. http://dx.doi.org/10.4028/www.scientific.net/amr.711.22.

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In this paper, the ammonium dichromate and copper nitrate were used as raw materials to prepare the copper chromite, and nanocopper chromite as a catalyst was used to synthesize the monomer dioxanone in diethylene glycol dehydrogenation. Under the strict conditions of no water and no oxygen, the stannous octoate was selected to catalyze ring-opening polymerization of the dioxanone to prepare the polydioxanone. And dioxanone and its polymers were characterized with IR spectroscopy,1H NMR spectroscopy, thermogravimetric analysis (TG) and differential scanning calorimetry (DSC ) measurements.

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43

Al-Sheikh, Ahmad, Kamal Sweidan, Cäcilia Maichle-Mößmer, Manfred Steimann, and Norbert Kuhn. "Synthesis and Reactions of 5-[Amino(thiomethyl)methylene]- 2,2-dimethyl-1,3-dioxane-4,6-dione." Zeitschrift für Naturforschung B 64, no. 1 (2009): 101–5. http://dx.doi.org/10.1515/znb-2009-0113.

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5-[Amino(thiomethyl)methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione (4) is obtained from 5-[bis- (thiomethyl)methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione (1) and aqueous ammonia in excellent yield. Its reaction with m-chloroperbenzoic acid gives the sulfoxide derivative 5-[amino(sulfinylmethyl) methylene]-2,2-dimethyl-1,3-dioxane-4,6-dione (5). With triphenylphosphine, 5 reacts to give triphenyl( thiomethyl)phosphonium 5-cyano-2,2-dimethyl-1,3-dioxane-4,6-dionate (6) from which the methyltriphenylphosphonium salt 6a is obtained with excess triphenylphosphine. The crystal structures of 4, 5 and

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44

Aizawa, Hideki. "Morphology of polysorbate 80 (Tween 80) micelles in aqueous 1,4-dioxane solutions." Journal of Applied Crystallography 42, no. 4 (2009): 592–96. http://dx.doi.org/10.1107/s002188980902295x.

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The structures of micelles of the surfactant polysorbate 80 (Tween 80) in 0–50% aqueous 1,4-dioxane solutions (pH 7.2, ionic strength 2.44 mM) were investigated by means of small-angle X-ray scattering. At 1,4-dioxane concentrations of 0–20%, core–shell cylindrical micelles formed because the crown-shaped polysorbate 80 molecules aggregated into a cylindrical layer of four chains entangled with one another through intra- and intermolecular interactions. At 30–40% 1,4-dioxane, core–shell discus micelles formed, and at 50% 1,4-dioxane, core–shell elliptic discus micelles formed by the same mecha

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45

Reháková, Mária, and Anna Sopková. "Clathrates of tetracyanonickelates containing 1,4-dioxane." Collection of Czechoslovak Chemical Communications 52, no. 12 (1987): 2890–99. http://dx.doi.org/10.1135/cccc19872890.

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It was found after study of modifications of tetracyano complexes with 1,4-dioxane that a similar product is formed also by direct addition of 1,4-dioxane to a solution of [Ni(NH3)m][Ni(CN)4] or to solid NiNi(CN)4.nH2O; and 1,4-dioxane is initially bonded as a guest molecule and then as a ligand. The amount of guest component or ligand in the compounds Ni(NH3)m(C4H8O2)aNi(CN)4.(y-a)C4H8O2.nH2O and Ni(C4H8O2)aNi(CN)4.(n-a)C4H8O2 depends on the preparation conditions and on the conditions of storage of the solid product after isolation. The results of TA, IR, and GC analysis confirmed the presen

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46

So, M. H., J. S. Han, T. H. Han, J. W. Seo, and C. G. Kim. "Decomposition of 1,4-dioxane by photo-Fenton oxidation coupled with activated sludge in a polyester manufacturing process." Water Science and Technology 59, no. 5 (2009): 1003–9. http://dx.doi.org/10.2166/wst.2009.056.

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The cyclic ether 1,4-dioxane is a synthetic industrial chemical that is used as a solvent in producing paints and lacquers. The EPA and the International Agency for Research on Cancer(IARC) classified 1,4-dioxane as a GROUP B2(probable human) carcinogen. 1,4-dioxane is also produced as a by-product during the manufacture of polyester. In this research, a polyester manufacturing company (i.e. K Co.) in Gumi, Korea was investigated regarding the release of high concentrations of 1,4-dioxane (about 600 mg/L) and whether treatment prior to release should occur to meet with the level of the regulat

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47

Tanabe, Akiko, and Kuniaki Kawata. "Determination of 1,4-Dioxane in Household Detergents and Cleaners." Journal of AOAC INTERNATIONAL 91, no. 2 (2008): 439–44. http://dx.doi.org/10.1093/jaoac/91.2.439.

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Abstract A possible human carcinogen, 1,4-dioxane, was investigated as to its concentration levels in household detergents and cleaners currently sold in Japan. A solid-phase extraction combined with stable isotope dilution and gas chromatographic/ mass spectrometric determination was evaluated for the determination of 1,4-dioxane in household products. The evaluation of the method was performed using a recovery study of 1,4-dioxane-d8 from detergent and cleaner samples. The mean overall recovery and relative standard deviation were 78 and 15, respectively. The limit of quantitation was 0.05 m

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48

Mikhailova, N. N., A. V. Mamlieva, G. A. Teptereva, S. Yu Shavshukova, and S. S. Zlotskii. "Advances and achievements of Academician D.L. Rakhmankulov’s scientific school in the field of applied and oilfield chemistry." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 1 (2021): 136–46. http://dx.doi.org/10.21285/2227-2925-2021-11-1-136-146.

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This paper reviews the achievements of the scientific school of Academician of the Academy of Sciences of the Republic of Bashkortostan, Professor of the Ufa State Petroleum Technological University (USPTU) D.L. Rakhmankulov in the field of applied and oilfield chemistry. Having achieved fundamental results during theoretical and experimental research into the structure, properties and mechanisms of transformations of substituted cyclic acetals and heteroanalogues, D.L. Rakhmankulov and his colleagues proposed to apply this knowledge in various sectors of the national economy, in particular, i

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49

Griesbaum, Karl, Gilbert Kiesel, Henri Mertens, Petra Krieger-Beck, and Henning Henke. "Acid-catalyzed reactions of six- and seven-membered cyclic hemiperacetals and peracetals and of related bicyclic ozonides." Canadian Journal of Chemistry 72, no. 11 (1994): 2198–204. http://dx.doi.org/10.1139/v94-280.

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HCl-catalyzed reactions of the hemiperacetals 3-methoxy-3-methyl-7-hydroxy-1,2-dioxepane (1a) and 3-methoxy-3-methyl-6-hydroxy-1,2-dioxane (1b) and of the related ozonides 1-methyl-6,7,8-trioxabicyclo[3.2.1]octane (2a) and 1-methyl-5,6,7-trioxabicyclo[2.2.1]heptane (2b) gave peroxidic monocyclic (11—13), bicyclic (14), and (or) tricyclic (15) products. By contrast, reactions of the peracetals corresponding to 1a and 1b, viz., 3-methyl-3,7-dimethoxy-1,2-dioxepane (13a) and 3-methyl-3,6-dimethoxy-1,2-dioxane (13b) gave only non-peroxidic products. Reactions of the persubstituted peracetals 3,6-d

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50

Asensio, Salvador B., Enrique Lopez-Cantarero, and Juan Llor. "The thermodynamics of the ionization of 3-hydroxypyridine and pyridoxine in water–dioxane mixtures." Canadian Journal of Chemistry 70, no. 6 (1992): 1635–39. http://dx.doi.org/10.1139/v92-203.

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A potentiometric method has been used to determine the thermodynamic equilibrium constants for the macroscopic ionization processes of 3-hydroxypyridine and pyridoxine in water–dioxane mixtures (0–70% weight fraction in dioxane) at temperatures from 10 to 50 °C. From these data the reaction standard thermodynamic function changes were obtained for the processes in various water–dioxane mixtures at 25 °C. It was found, in both molecules, that during the first ionization process the contributions of entropy and enthalpy to free energy are similar but that during the second ionization the main co

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