Heterocyclic Building Blocks-Tetrahydrofuran

Tran, Luc-Sy; Carstensen, Hans-Heinrich; Foo, Kae Ken; Lamoureux, Nathalie; Gosselin, Sylvie; Gasnot, Laurent; El-Bakali, Abderrahman; Desgroux, Pascale published the artcile< Experimental and modeling study of the high-temperature combustion chemistry of tetrahydrofurfuryl alcohol>, SDS of cas: 97-99-4, the main research area is tetrahydrofurfuryl alc high temperature combustion chem.

In the present study, the high-temperature (HT) combustion chem. of tetrahydrofurfuryl alc. (THFA), a THF based biofuel, was investigated using a comprehensive exptl. and numerical approach.Representative chem. species profiles in a stoichiometric premixed methane flame doped with ∼20% (molar) THFA at 5.3 kPa were measured using online gas chromatog. The flame temperature was obtained by NO laser-induced fluorescence (LIF) thermometry. More than 40 chem. products were identified and quantified. Many of them such as ethylene, formaldehyde, acrolein, allyl alc., 2,3-dihydrofuran, 3,4-dihydropyran, 4-pentenal, and tetrahydrofuran-2-carbaldehyde are fuel-specific decomposition products formed in rather high concentrations In the numerical part, as a complement to kinetic modeling, high-level theor. calculations were performed to identify plausible reaction pathways that lead to the observed products. A detailed kinetic model for high-temperature combustion of THFA was developed, which reasonably predicts the exptl. data. Subsequent rate anal. showed that THFA is mainly consumed by H-abstraction reactions yielding several fuel radicals that in turn undergo either β-scission reactions or intramol. radical addition that effectively leads to ring enlargement. Along THFA reaction routes, the derived species with cis configuration were found to be thermodynamically more stable than their corresponding trans configuration, which differs from usual observations for hydrocarbons.

Proceedings of the Combustion Institute published new progress about Biofuels. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, SDS of cas: 97-99-4.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Yan, Houchun; Han, Yuanyuan; Sun, Shiwei; Han, Mai; Fan, Wenyang; Li, Qingsong published the artcile< Liquid-liquid equilibrium for ternary systems of water + tetrahydrofurfuryl alcohol + isopentanol/1-hexanol at 303.2, 313.2, 323.2 K>, Recommanded Product: (Tetrahydrofuran-2-yl)methanol, the main research area is water tetrahydrofurfuryl alc isopentanol hexanol liquid equilibrium.

In 101.3 kPa, Liquid-liquid equilibrium (LLE) data of water + tetrahydrofurfuryl alc. (THFA) + isopentanol/1-hexanol were measured at 303.2, 313.2, and 323.2 K. The distribution coefficient and separation coefficient of THFA extracted from water were used to assess the utility. The measured data were connected through the NRTL and UNIQUAC models to regress the binary interaction parameters. The GUI-MATLAB was used to check the consistency of the calculated binary interaction parameters and LLE data. The RMSD of both models were less than 0.0077 to prove their consistency with the exptl. data.

Journal of Chemical Thermodynamics published new progress about Liquid-liquid equilibrium. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Recommanded Product: (Tetrahydrofuran-2-yl)methanol.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Jeong, Keuk-Min; Tapaswi, Pradip Kumar; Kambara, Takehiko; Ishige, Ryohei; Ando, Shinji; Ha, Chang-Sik published the artcile< Photoconductive polyimides derived from a novel imidazole-containing diamine>, SDS of cas: 4415-87-6, the main research area is imidazole containing polyimide preparation photoconductive property.

A new diamine containing an imidazole structure, 4,4′-(4,5-diphenyl-1H-imidazole-1,2-diyl)dianiline (DIMA), was synthesized to prepare photoconductive polyimides (PIs) with four types of dianhydrides such as 3,3′,4,4′-biphenyltetracarboxylic dianhydride, 4,4′-oxydiphthalic anhydride, 4,4′-(hexafluoroisopropylidene) diphthalic anhydride, and cyclobutane-1,2,3,4,-tetracarboxylic dianhydride, based on the fact that the imidazole ring is a useful n-type block with high electron-donating property and good thermal stability. The imidazole-containing diamine possesses high electron-donating properties due to the lone pair electrons at nitrogen, which affords a high hole-transport property. All the PIs prepared from DIMA were amorphous due to the large side group and kink structure of the diamine, optically transparent (transmittances of 92-98% at 450 nm), and exhibited high thermal stability (10% weight loss temperatures ranged 453-558°).

High Performance Polymers published new progress about Absorption. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, SDS of cas: 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Luo, Yang; Ma, Hong; Zhang, Shujing; Zheng, Daoyuan; Che, Penghua; Liu, Xin; Zhang, Meiyun; Gao, Jin; Xu, Jie published the artcile< Binding Energy as Driving Force for Controllable Reconstruction of Hydrogen Bonds with Molecular Scissors>, Application of C5H10O2, the main research area is binding energy hydrogen bond mol scissor.

Hydrogen bonds are one of the most important directional intermol. interactions and play key roles in chem. and biochem. systems, but there is still a lack of prediction and understanding of their control. Herein, hydrogen-binding energy (EHB) acted as a driving force for controllably reconstructing hydrogen bonds with mol. scissors. We related hydrogen-binding energies of the donor-acceptor couple (EHB,2) and the donor itself (EHB,1) and ΔG based on ΔG = a1EHB,1 + a2EHB,2 + a3. When EHB,1 and EHB,2 satisfy the condition ΔG < 0, the acceptor is predicted as mol. scissors with sufficient reconstruction capacity in breaking the initial hydrogen bonds and forming new ones. Remarkably, we developed an exptl. method to determine the EHB values by a linear equation as a function of chem. shifts (δ), which is innovational since in the former research EHB can only be deduced from empirical formulas and DFT calculation On that basis, the hydrogen bonds of α-cellulose were broken and re-formed in mol. scissors-consisting deep eutectic solvents, leading to the white powder transforming into a hydrogel and colorless and transparent thin film materials with distinct crystalline structure, surface flatness, and morphol. Journal of the American Chemical Society published new progress about Binding energy. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Application of C5H10O2.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Peijnenburg, W. J. G. M.; Buck, H. M. published the artcile< The effects of substituents and solvent polarity on photochemical [1,3] sigmatropic shifts. Experimental evidence in favor of the occurrence of sudden polarization in acyclic alkenes>, Name: 2,2,5,5-Tetramethyldihydrofuran-3(2H)-one, the main research area is photorearrangement ethylidenenaphthalenol mechanism.

On direct irradiation of I in various solvents, fast E-Z isomerization around the exocyclic double bond was observed This led to the formation of a 50:50 mixture of E/Z isomers. Further irradiation of this mixture resulted in the clean formation of II, the product derived from a photochem. [1,3]-OH shift in I or its geometric isomer. The yield of II decreases going from a highly apolar solvent to the most polar solvent, n-hexane-autonitrile. This result is a clear support in favor of the sudden polarization mode 1.

Tetrahedron published new progress about Photorearrangement. 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Name: 2,2,5,5-Tetramethyldihydrofuran-3(2H)-one.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Tal, Nitzan; Morehouse, Benjamin R.; Millman, Adi; Stokar-Avihail, Avigail; Avraham, Carmel; Fedorenko, Taya; Yirmiya, Erez; Herbst, Ehud; Brandis, Alexander; Mehlman, Tevie; Oppenheimer-Shaanan, Yaara; Keszei, Alexander F. A.; Shao, Sichen; Amitai, Gil; Kranzusch, Philip J.; Sorek, Rotem published the artcile< Cyclic CMP and cyclic UMP mediate bacterial immunity against phages>, Recommanded Product: ((2R,3S,4R,5R)-5-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate, the main research area is Pycsar; anti-phage; bacteria; cCMP; cUMP; cyclase; defense; pb8; phage; pyrimidine.

The cyclic pyrimidines 3′,5′-cyclic cytidine monophosphate (cCMP) and 3′,5′-cyclic uridine monophosphate (cUMP) have been reported in multiple organisms and cell types. As opposed to the cyclic nucleotides 3′,5′-cyclic adenosine monophosphate (cAMP) and 3′,5′-cyclic guanosine monophosphate (cGMP), which are second messenger mols. with well-established regulatory roles across all domains of life, the biol. role of cyclic pyrimidines has remained unclear. Here we report that cCMP and cUMP are second messengers functioning in bacterial immunity against viruses. We discovered a family of bacterial pyrimidine cyclase enzymes that specifically synthesize cCMP and cUMP following phage infection and demonstrate that these mols. activate immune effectors that execute an antiviral response. A crystal structure of a uridylate cyclase enzyme from this family explains the mol. mechanism of selectivity for pyrimidines as cyclization substrates. Defense systems encoding pyrimidine cyclases, denoted here Pycsar (pyrimidine cyclase system for antiphage resistance), are widespread in prokaryotes. Our results assign clear biol. function to cCMP and cUMP as immunity signaling mols. in bacteria.

Cell (Cambridge, MA, United States) published new progress about 58-97-9. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Recommanded Product: ((2R,3S,4R,5R)-5-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Dwivedi, Sumant; Nag, Aniruddha; Sakamoto, Shigeki; Funahashi, Yasuyoshi; Harimoto, Toyohiro; Takada, Kenji; Kaneko, Tatsuo published the artcile< High-temperature resistant water-soluble polymers derived from exotic amino acids>, Reference of 4415-87-6, the main research area is temperature resistant water soluble polyimide preparation.

High-performance water-soluble polymers have a wide range of applications from engineering materials to biomedical plastics. However, existing materials are either natural polymers that lack high thermostability or rigid synthetic polymers. Therefore, we design an amino acid-derived building block, 4,4′-diamino-α-truxillate dianion (4ATA2-), that induces water solubility in high-performance polymers. Polyimides containing 4ATA2- units are intrinsically water-soluble and are processed into films cast from an aqueous solution The resulting polyimide films exhibit exceptional transparency and extremely high thermal stability. In addition, the films can be made insoluble in water by simple post-treatment using weak acid or multivalent metal ions such as calcium. The synthesized polyimide’s derived from bio-based resources are useful for yielding waterborne polymeric high-performance applications.

RSC Advances published new progress about Elongation at break. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Reference of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Wu, Jingcheng; Zhang, Xinghua; Chen, Qiang; Chen, Lungang; Liu, Qiying; Wang, Chenguang; Ma, Longlong published the artcile< One-Pot Hydrogenation of Furfural into Tetrahydrofurfuryl Alcohol under Ambient Conditions over PtNi Alloy Catalyst>, Product Details of C5H10O2, the main research area is furfural one pot hydrogenation tetrahydrofurfuryl alc platinum nickel alloy.

Furfural (FAL), a promising renewable platform compound from biomass, can be totally hydrogenated to an industrially important platform chem., tetrahydrofurfuryl alc. (THFA). In this work, a high yield of THFA was obtained by one-pot hydrogenation of FAL over a PtNi catalyst under mild reaction conditions. Small PtNi alloy particles were well distributed on active carbon. The catalysts were characterized by several phys.-chem. technologies (transmission electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, and inductively coupled plasma spectroscopy). Temperature-programmed reduction with hydrogen and in situ XPS demonstrate the presence of PtNi alloy. The electron-rich metal Pt could facilitate the heterolytic dissociation of hydrogen and promote the hydrogenation of FAL. Pt sites on the surface facilitate the adsorption at aldehyde (C=O) groups, and the furan ring strongly adsorbs on the Ni surface. Low reaction temperature is advantageous to reduce side reactions. Various metal concentrations were employed in this reaction; Pt(3)Ni(3)/C catalyst exhibits the best performance, achieving 99% FAL conversion and 93% THFA yield at 35°C and under 2 MPa H2.

Energy & Fuels published new progress about Hydrogenation catalysts. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Product Details of C5H10O2.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Wanderley, Ricardo R.; Pinto, Diego D. D.; Knuutila, Hanna K. published the artcile< Investigating opportunities for water-lean solvents in CO2 capture: VLE and heat of absorption in water-lean solvents containing MEA>, COA of Formula: C5H10O2, the main research area is flue gas carbon dioxide absorption water lean solvent; amine wet scrubbing carbon dioxide absorption; vapor liquid equilibrium water lean solvent carbon dioxide absorption; high volatility solvent carbon dioxide absorption; low volatility solvent carbon dioxide absorption.

A thorough study of a set of organic diluents for water-lean solvent formulation was conducted. Performance of 30 weight percent/weight aqueous monoethanolamine (MEA) 30 was compared to that of mixtures of 30 weight percent/weight MEA and methanol, acetone, monoethylene glycol (MEG), N-methyl-2-pyrrolidone (NMP), tetrahydrofurfuryl alc. (THFA), sulfolane, cyclopentanone (CC5), furfuryl alc., and γ-butyrolactone. A small calorimeter was used to obtain vapor-liquid equilibrium (VLE) and heat of absorption data. Shifting from aqueous to non-aqueous solvents had significant implications for VLE, since all water-lean solvents had lower CO2 solubility than aqueous MEA; however, heat of absorption was not much affected. Results showed the limitations of using most ethers, esters, and ketones for water-lean solvent formulation, all stemming from the very low dielec. permittivity of these diluents and the difficulty of stabilizing intermediate reaction species between MEA and CO2 within these systems. Nevertheless, the low volatility of solvents containing MEG, NMP, or THFA could offer opportunities for processes with overall less reboiler heat duties than that of ordinary aqueous MEA.

Separation and Purification Technology published new progress about Absorption. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, COA of Formula: C5H10O2.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Hagens, Graham; Wasacz, John P.; Joullie, Madeleine; Yates, Peter published the artcile< Photolysis of 2,2,5,5-tetramethyldihydro-3-furanone>, SDS of cas: 5455-94-7, the main research area is furanones photolysis; photolysis furanones.

The photolysis of 2,2,5,5-tetramethyldihydro-3(2H)-furanone in MeOH gives Me 3-isopropoxy-3-methylbutanoate, Me 3-methyl-2-butenoate, iso-Pr 3-methyl-2-butenoate, Me 3-methyl-3-butenoate, and iso-PrOH. These products are all considered to arise via the ketene formed by Norrish type I cleavage of the dihydrofuranone followed by intramol. H abstraction. Corroboration for this view is that photolysis of 2,2,5,5-tetramethyldihydro-3(2H)-furanone-4-d2 in MeOH gives Me 3-(isopropoxy-2-d)-3-methylbutanoate and Me 3-methyl-2-butenoate-2-d.

Journal of Organic Chemistry published new progress about Photolysis. 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, SDS of cas: 5455-94-7.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem