Topic
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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TL;DR: Oligo- and poly-(1,1′-dihexylferrocenylenes) were synthesized by reaction of dihexylfulvalene dianion with [FeCl2(thf)2]-thf = tetrahydrofuran.
Abstract: Oligo- and poly-(1,1′-dihexylferrocenylenes), more soluble than unsubstituted oligo- and poly-(1,1′-ferrocenylenes), were synthesized by reaction of dihexylfulvalene dianion with [FeCl2(thf)2](thf = tetrahydrofuran). Electrochemical properties of pentamers and a hexamer were revealed and compared with theory for a system with a linear combination of redox centres. Charge-transfer complexes of poly(dihexylferrocenylene)(M= 5000, M/Mn= 1.2) with tetracyanoethylene and 7,7,8,8-tetracyanoquino-dimethane exhibit photoconductivity.
45 citations
TL;DR: For example, metal(IV) phosphates of tin, zirconium and titanium were used as catalysts for selective cyclodehydration of butane-1,4-diol to tetrahydrofuran in high yields.
45 citations
TL;DR: In this paper, the authors investigated the catalytic performance of 1,4-butanediol over lanthanide oxides at 375°C and found that Yb2O3 showed the most efficient catalytic activity in the formation of 3-buten-1-ol.
45 citations
TL;DR: A systematic investigation was conducted to explore how different concentrations of structure-directing agents affected the frameworks of resultant metal-organic frameworks and showed that the catalytic activity of 2 was much higher than that of 1 and 3, because of its unique structural features, including accessible catalytic sites and suitable channel size and shape.
Abstract: Solvent templates induced Co-based metal–organic materials; conformational isomers {[Co2(pdpa)(CH3CN)(H2O)3]·CH3OH·H2O}n (1) and {[Co2(pdpa)(CH3CN)(H2O)3]}n (2) and {[Co5(pdpa)2(μ3-OH)2(H2O)6]·2H2O}n (3) [H4pdpa = 5,5′-(pentane-1,2-diyl)-bis(oxy)diisophthalic acid] were synthesized under the same solvothermal conditions except with different concentrations of cyclic ethers (1,4-dioxane or tetrahydrofuran) as structure-directing agents. Structural transformations from a three-dimensional (3D) framework of 1 containing channels with dimensions of ∼6 A × 6 A to a two-dimensional layer structure of 2 consisting of large open channels with a size of ∼15 A × 8 A and then to a 3D nonporous framework of 3, resulting from the different concentrations of cyclic ethers, were observed. The anion−π interactions between electron-efficient oxygen atoms of cyclic ethers and electron-deficient dicarboxylic acid aromatic cores in H4pdpa imported into the synthetic process accounted for the conformational change of the liga...
45 citations
TL;DR: In this article, the results suggest that hydrogen bonding may assist in the ether cleavage process, since this reaction is not observed for ligands devoid of N-H functions, which may even become dominant at long reaction times and more forcing conditions.
Abstract: The reaction of anhydrous beryllium chloride with nitrogen donors L in diethylether as a solvent under mild conditions affords 1:2 complexes of the type L 2 BeCl 2 [L = benzonitrile (1), pyridine (2), 3,5-dimethylpyridine, pyrrolidine, piperidine (8), and diethylamine (10)]. Structural studies of compounds 1, 2, 8 (CHCl 3 ), and 10 have shown that the complexes have the beryllium centers N 2 Cl 2 -tetracoordinated with a distorted tetrahedral geometry of the core unit. In crystals of 8 and 10 these molecules are associated to form helical strings via distinct N-H-Cl hydrogen bonding. The reaction of the weak donor pyrazole (pyz) with (Et 2 O) 2 BeCl 2 at low temperature gives the mixed complex [(Et 2 O)(pyz)BeCl 2 ] (4), in which one diethylether molecule is retained in the inner coordination sphere of the metal. In tetrahydrofuran (thf) solution, no reaction is observed with pyrazole, indicating that tetrahydrofuran is the stronger donor as compared to pyrazole, and the (thf) 2 BeCl 2 solvate remains intact. By contrast, with the strong base pyrrolidine (pyrr) the same reaction leads to substitution of one chloride ligand to give the ionic product [(pyrr) 3 BeCl] + Cl - , (7). Both products (4, 7) have been structurally characterized. At room temperature the reactions with pyrazole or piperidine lead to ether cleavage as a side-reaction which may even become dominant at long reaction times and more forcing conditions. Dinuclear complexes of the type [LBeClμ 2 -OR)] 2 are formed, the structures of which have also been determined. The results suggest that hydrogen bonding may assist in the ether cleavage process, since this reaction is not observed for ligands devoid of N-H functions.
45 citations