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Tetrahydrofuran

About: Tetrahydrofuran is a research topic. Over the lifetime, 11778 publications have been published within this topic receiving 158241 citations. The topic is also known as: diethylene oxide & 1,4-epoxybutane.


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Journal ArticleDOI
TL;DR: In this paper, the behavior of the chemical species formed by the reduction of sulfur with alkali metals in nonaqueous solvent has not yet been clarified, but it is shown that polysulfide dianions (Sm2−, m > 1) and radical anions (Sn−, n ≥ 1) are in a state of equilibrium.

106 citations

Journal ArticleDOI
TL;DR: In this article, polystyrene resins containing flexible tetrahydrofuran derived cross-linkers are presented, which render the resins more organic solvent-like and thus impart increased swelling/solvation characteristics.

106 citations

Journal ArticleDOI
TL;DR: In this paper, two strategies were employed to suppress this shortcoming, one involving the replacement of PVC with poly(vinyl chloride-co-vinyl acetate) (PVCAC) copolymer and the other the direct utilization of solvents for PVC or PVCAC instead of using an auxiliary carrier solvent (e.g., tetrahydrofuran, THF).
Abstract: Poly(vinyl chloride) (PVC)-based electrolytes, a class of the most promising polymer electrolytes, are found to suffer from solvent exudation. Two strategies were employed to suppress this shortcoming, one involving the replacement of PVC with poly(vinyl chloride-co-vinyl acetate) (PVCAC) copolymer and the other the direct utilization of solvents for PVC or PVCAC instead of using an auxiliary carrier solvent (e.g., tetrahydrofuran, THF). The thermodynamics of polymer solubility was particularly emphasized in the latter approach. N,N-dimethylformamide (DMF) and N-methyl pyrrolidionone (NMP) are preferred cosolvents of ethylene carbonate (EC) and/or propylene carbonate (PC). The PVCAC-based gel electrolytes prepared were then characterized by ionic conductivity, cyclic voltammetry, and ac impedance data. The results indicate that electrolytes containing NMP/EC mixed solvent exhibit conductivities exceeding 10{sup {minus}3} S/cm whereas the electrolytes containing DMF/EC/PC exhibit conductivities around 10{sup {minus}4} S/cm at room temperature. Moreover, the former category was found to be oxidatively stable up to 4.9 V vs. Li/Li{sup +} and the latter to 4.6 V vs. Li/Li{sup +}. Finally, ac impedance results suggest that the stability of the Li/electrolyte interface needs further improvement, which is a crucial task for most polymer gel electrolytes at present.

106 citations

Journal ArticleDOI
Hans Gerlach1
TL;DR: The mold metabolite curvularin (VIII) has been synthesized with the help of a new carboxyl protecting group that can be removed selectively with fluoride ions as mentioned in this paper.
Abstract: 2-(Trimethylsilyl)ethyl Esters as Carboxyl Protecting Group; Application in the Synthesis of (−)-(S)-Curvularin The mould metabolite curvularin (VIII) has been synthesized with the help of a new carboxyl protecting group that can be removed selectively with fluoride ions. 2-(Trimethylsilyl)ethyl 7-hydroxy-octanoate (III) was acylated with 3,5-dibenzyloxy-phenacetyl chloride (IV) to form V with two different ester groups. Tetrabutyl-ammonium fluoride in tetrahydrofuran cleaved the 2-(trimethylsilyl)ethyl ester in V selectively to form the carboxylate anion of VI together with ethylene and trimethylsilyl fluoride. Curvularin dibenzyl ether (VII) was formed by intramolecular acylation of VI. Removal of the benzyl ether groups in VII by hydrogenolysis led to (±)-curvularin (VIII). The naturally occurring (−)-enantiomer was formed when (+)-(S)-III served as starting material.

106 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023194
2022382
2021124
2020154
2019193
2018218