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Littérature scientifique sur le sujet « Ethanediol-1 »

Auteur : Grafiati
Publié le 17 novembre 2023

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Articles de revues sur le sujet "Ethanediol-1"

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Skidmore, J. A., M. Billah et N. M. Loskutoff. « Developmental competence in vitro and in vivo of cryopreserved, hatched blastocysts from the dromedary camel (Camelus dromedarius) ». Reproduction, Fertility and Development 16, no 6 (2004) : 605. http://dx.doi.org/10.1071/rd03094.

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The present paper describes experiments designed to investigate methods for cryopreserving embryos from dromedary camels. Because preliminary studies had shown ethanediol to be the best cryoprotectant to use for camel embryos, the current experiments were performed to determine the minimum exposure time to 1.5 m ethanediol required to achieve cryoprotection. The uteri of 30 donor camels were flushed non-surgically 8 days after mating. Embryos were recovered and 158 were assigned to one of three groups, which were exposed to 1.5 m ethanediol for either 10 min (n = 67), 5 min (n = 51) or 1 min (n = 40). Embryos were subsequently thawed and rehydrated by expelling either directly into holding medium (HM; HEPES-buffered Tyrode's medium containing sodium lactate and 3 mg mL−1 bovine serum albumin, 10% fetal calf serum, 100 IU mL−1 penicillin G, 100 μg mL−1 streptomycin and 25 μg mL−1 amphotercin B) or initially into HM containing 0.2 m sucrose for 5 or 10 min. The survival rate of all embryos immediately post-thawing, as judged by the morphological appearance of the embryos, was high (91%), but was greatly reduced after 2 h culture (59%). Ninety-two embryos were transferred to recipient camels resulting in 18 viable fetuses (1 min ethanediol exposure, n = 1/15; 5 min ethanediol exposure, n = 3/34; 10 min ethanediol exposure, n = 14/43). Of the embryos rehydrated directly in HM, six of 65 resulted in viable fetuses and those rehydrated initially in 0.2 m sucrose for 5 or 10 min resulted in nine of 47 and three of 46 fetuses respectively. From these experiments, we conclude that camel embryos can be cryopreserved using ethanediol as a cryoprotectant when the embryos are cooled slowly (to 33°C) before being plunged into liquid nitrogen for storage.
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Heppke, G., D. Lötzsch et F. Oestreicher. « Chirale Dotierstoffe mit außergewöhnlich hohem Verdrillungsvermögen ». Zeitschrift für Naturforschung A 41, no 10 (1 octobre 1986) : 1214–18. http://dx.doi.org/10.1515/zna-1986-1006.

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Mesogenic chiral esters of 1-phenyl-1,2-ethandiol, 1-cyclohexyl-1,2-ethanediol, 1,2-diphenyl- 1,2-ethanediol, 1,1´-bi-2-naphthol, 1-phenylethanol, 1-phenyl-2,2,2-trifluorethanol and 1-(9- anthryl)-2,2,2-trifluorethanol were synthesized. The temperature dependence of the molecular twisting power was determined in the nematic wide range mixture RO-TN 404. All compounds show good solubility and unusual high values of the molecular twisting power.
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Leonelli, Francesca, Irene Piergentili, Giulio Lucarelli, Luisa Maria Migneco et Rinaldo Marini Bettolo. « Unexpected Racemization in the Course of the Acetalization of (+)-(S)-5-Methyl-Wieland–Miescher Ketone with 1,2-Ethanediol and TsOH under Classical Experimental Conditions ». International Journal of Molecular Sciences 20, no 24 (5 décembre 2019) : 6147. http://dx.doi.org/10.3390/ijms20246147.

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(+)-(S) and (−)-(R)-5-methyl-Wieland-Miescher ketone (+)-1 and (−)-1, are important synthons in the diastereo and enantioselective syntheses of biological and/or pharmacological interesting compounds. A key step in these syntheses is the chemoselective C(1)O acetalization to (+)-5 and (−)-5, respectively. Various procedures for this transformation have been described in the literature. Among them, the classical procedure based on the use of 1,2-ethanediol and TsOH in refluxing benzene in the presence of a Dean-Stark apparatus. Within our work on bioactive natural products, it occurred to us to observe the partial racemization of (+)-5 in the course of the acetalization of (+)-1 by means of the latter methodology. Aiming to investigate this drawback, which, to our best knowledge, has no precedents in the literature, we acetalized with 1,2-ethanediol and TsOH in refluxing benzene and in the presence of a Dean–Stark apparatus under various experimental conditions, enantiomerically pure (+)-1. It was found that the extent of racemization depends on the TsOH/(+)-1 and 1,2-ethanediol/(+)-1 ratios. Mechanism hypotheses for this partial and unexpected racemization are provided.
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Peng, Fei, Ying Zhao, Fang-Zhou Li, Xiao-Yang Ou, Ying-Jie Zeng, Min-Hua Zong et Wen-Yong Lou. « Highly enantioselective resolution of racemic 1-phenyl-1,2-ethanediol to (S)-1-phenyl-1,2-ethanediol by Kurthia gibsonii SC0312 in a biphasic system ». Journal of Biotechnology 308 (janvier 2020) : 21–26. http://dx.doi.org/10.1016/j.jbiotec.2019.11.012.

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Liu, Xiaolei, Min Wei, Feng Li et Xue Duan. « Intraparticle diffusion of 1-phenyl-1, 2-ethanediol in layered double hydroxides ». AIChE Journal 53, no 6 (2007) : 1591–600. http://dx.doi.org/10.1002/aic.11184.

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Yi, Wenwen, Le Qin, Xiao-Yuan Lian et Zhizhen Zhang. « New Antifungal Metabolites from the Mariana Trench Sediment-Associated Actinomycete Streptomyces sp. SY1965 ». Marine Drugs 18, no 8 (24 juillet 2020) : 385. http://dx.doi.org/10.3390/md18080385.

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New streptothiazolidine A (1), streptodiketopiperazines A (2) and B (3), and (S)-1-(3-ethylphenyl)-1,2-ethanediol (4), together with eight known compounds (5–12), were isolated from the Mariana Trench sediment-associated actinomycete Streptomyces sp. SY1965. The racemic mixtures of (±)-streptodiketopiperazine (2 and 3) and (±)-1-(3-ethylphenyl)-1,2-ethanediol (4 and 5) were separated on a chiral high-performance liquid chromatography (HPLC) column. Structures of the new compounds were elucidated by their high-resolution electrospray ionization mass spectroscopy (HRESIMS) data and extensive nuclear magnetic resonance (NMR) spectroscopic analyses. Streptothiazolidine A is a novel salicylamide analogue with a unique thiazolidine-contained side chain and its absolute configuration was established by a combination of nuclear Overhauser effect spectroscopy (NOESY) experiment, electronic circular dichroism (ECD) and 13C NMR calculations. New streptothiazolidine A (1) and streptodiketopiperazines A (2) and B (3) showed antifungal activity against Candida albicans with MIC values of 47, 42, and 42 g/mL, respectively.
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McGinty, D., C. S. Letizia et A. M. Api. « Fragrance material review on 1,2-ethanediol, 1-phenyl-, 1,2-diacetate ». Food and Chemical Toxicology 50 (septembre 2012) : S327—S329. http://dx.doi.org/10.1016/j.fct.2012.02.048.

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Yamagiwa, Kiyofumi, Yuriko Iwao, Masafumi Mikami, Tsuneharu Takeuchi, Morihiro Saito et Jun Kuwano. « Liquid-Phase Synthesis of Carbon Nanotubes from Alcohols ». Key Engineering Materials 350 (octobre 2007) : 19–22. http://dx.doi.org/10.4028/www.scientific.net/kem.350.19.

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Vertically aligned carbon nanotubes (CNTs) were grown on a stainless steel substrate (SUS304) by resistance-heating method in alcohols containing homogeneously dissolved cobaltocene Co(C5H5)2 as a catalyst source. Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine the effects of the molecular structures on the morphology of the aligned CNTs. Methanol brought the best purity and alignment of CNTs of all the alcohols. The CNTs from 1,2-ethanediol was worse in the purity than those from ethanol with the same number of carbon atoms. The CNTs from cyclohexanol had a better purity than those from 1-hexanol. Distinctive features of this method are simple, low cost and a one-step process involving none of vacuum processes and catalyst preparation processes.
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Yang, Yun-Xu, et Shi-Xiang Liu. « Asymmetric-Catalysed Preparation and Stereochemistry of (R,R)-,(S,R)-(6-Fluoro-2-Chromanyl)-1,2-Ethanediol ». Journal of Chemical Research 2007, no 9 (septembre 2007) : 506–8. http://dx.doi.org/10.3184/030823407x240908.

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(R,R)-,(S,R)-1-(6-fluoro-2-chromanyl)-1,2-ethanediol 1a/1b were prepared by hydrolytic kinetic resolution (HKR) of terminal racemic epoxides using (R,R)-SalenCo(OAc) as a catalyst. Their configurations were established by comparison with two authentic samples by HPLC.
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Marx, Melissa A., Zhihao Cui, Sung Gu Cho, Benjamin P. Charnay et Anne C. Co. « (Keynote) Insights into the CO2 Reduction Pathway through the Electrolysis of Aldehydes ». ECS Meeting Abstracts MA2022-01, no 49 (7 juillet 2022) : 2093. http://dx.doi.org/10.1149/ma2022-01492093mtgabs.

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Investigating the electrochemical reduction of aldehydes to alcohols provides insights into the mechanistic pathways of converting CO2 to alcohols electrochemically. Both acetaldehyde and propionaldehyde were electrochemically reduced on a polycrystalline Cu catalyst to illustrate that it is a viable pathway to ethanol and 1-propanol, respectively, supporting the mechanistic route previously proposed in the literature. 13C and 1H NMR analysis on isotopically labeled acetaldehyde was utilized to trace the reduction process. In an aqueous solution, acetaldehyde is at equilibrium with ethanediol, and propionaldehyde with propanediol. The dissociation of adsorbed ethanediol to acetaldehyde and water was also found to be favorable on both Cu and Au surfaces. Experimental observations were also supported with DFT calculations, indicating a higher-energy reaction intermediate on Au (111) over Cu (100). In summary, the results from this study support previously proposed mechanisms and provide a framework for testing other stable CO2 reaction intermediates to gain insights into the overall CO2 reaction pathway. Figure 1
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Chapitres de livres sur le sujet "Ethanediol-1"

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Wohlfarth, Ch. « Liquid-liquid equilibrium data of poly(N-phenylmaleimide-co-octadecyl vinyl ether) in 1-butanol and 1,2-ethanediol ». Dans Polymer Solutions, 228. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32057-6_124.

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Demaison, J. « 229 C2H6O2 1,2-Ethanediol ». Dans Asymmetric Top Molecules. Part 1, 446–47. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10371-1_231.

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Sposito, Garrison. « Soil Humus ». Dans The Chemistry of Soils. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190630881.003.0007.

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Biomoleculesare compounds synthesized to sustain the life cycles of organisms. In soil humus, they are usually products of litter degradation, root excretion, and microbial metabolism, ranging in molecular structure from simple organic acids to complex biopolymers. Organic acids are among the best-characterized biomolecules. Table 3.1 lists five aliphatic (meaning the C atoms are arranged in open-chain structures) organic acids associated commonly with the soil microbiome. These acids contain the unit R—COOH, where COOH is the carboxyl groupand R represents either H or an organic moiety. The carboxyl group can lose its proton easily within the normal range of soil pH (see the third column of Table 3.1) and so is an example of a Brønsted acid. The released proton, in turn, can attack soil minerals to induce their decomposition (see Eq. 1.2), whereas the carboxylate anion (COO-) can form soluble complexes with metal cations, such as Al3+, that are released by mineral weathering [for example, in Eq. 1.7, rewrite oxalate, C2O42-, as (COO-) 2]. The total concentration of organic acids in the soil solution ranges up to 5 mM. These acids tend to have very short lifetimes because of biocycling, but they abide as a component of soil humus, especially its water-soluble fraction, because they are produced continually by microorganisms and plant roots. Formic acid (methanoic acid), the first entry in Table 3.1, is a monocarboxylic acid produced by bacteria and found in the root exudates of maize. Acetic acid (ethanoic acid) also is produced microbially—especially under anaerobic conditions—and is found in root exudates of grasses and herbs. Formic and acetic acid concentrations in the soil solution range from 2 to 5 mM. Oxalic acid (ethanedioic acid), which is ubiquitous in soils, and tartaric acid (D- 2,3-dihydroxybutanedioic acid) are dicarboxylic acids produced by fungi and excreted by plant roots; their soil solution concentrations range from 0.05 to 1 mM. The tricarboxylic citric acid (2-hydroxypropane- 1,2,3-tricarboxylic acid) is also produced by fungi and excreted by plant roots. Its soil solution concentration is less than 0.05 mM.
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