Category: Tetrahydrofurans

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

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

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

Byun, Mi Yeon; Lee, Man Sig published the artcile< Effect of carboxylate stabilizers on the performance of Pt/C catalysts for furfural hydrogenation>, Related Products of 97-99-4, the main research area is platinum carbon furfural hydrogenation catalyst.

Highly dispersed carbon-supported Pt (Pt/C) catalysts with various carboxylate stabilizers were prepared by deposition-reduction and characterized. The Pt complexes surrounded by stabilizer retard the aggregation of Pt nanoparticles during the precipitation and reduction process. Increasing the carbon chain length of the stabilizer from one to two resulted in nanosized Pt particles, which afforded more stable nucleation and growth of the Pt. However, increasing the alkyl chain length of the stabilizer to five produced aggregated Pt particles because the particles became entangled during the interaction between the Pt complexes and the carbon support. The Pt/C catalyst prepared by using sodium succinate dibasic as the stabilizer has the highest Pt dispersion at 68%. The Pt/C catalysts with carboxylate stabilizers were evaluated for use in aqueous-phase furfural hydrogenation. Catalysts with a higher Pt dispersion exhibited higher furfural conversion and higher selectivity for furfuryl alc. Using sodium succinate as the stabilizer, the optimum conditions afforded 100% furfural conversion and 86.6% furfuryl alc. selectivity.

Journal of Environmental Chemical Engineering published new progress about Adsorption. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Related Products of 97-99-4.

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

Koley, Paramita; Rao, B. Srinivasa; Sabri, Ylias M.; Bhargava, Suresh K.; Tardio, James; Lingaiah, N. published the artcile< Selective conversion of furfural into tetrahydrofurfuryl alcohol using a heteropoly acid-based material as a hydrogenation catalyst>, Recommanded Product: (Tetrahydrofuran-2-yl)methanol, the main research area is vanadium palladium molybdophosphoric acid catalyst preparation furfural hydrogenation.

Tetrahydrofurfuryl alc. (THFAL) is a green solvent as well as a significant platform chem. which can be obtained from biomass derived furfural. In this study, new palladium exchanged vanadium incorporated supported heteropoly molybdate (PdMPAV2) catalysts were synthesized using a simple wet impregnation method and studied for selective hydrogenation of furfural. Six different catalysts were investigated: PdMPAV2/Al2O3, PdMPAV2/TiO2, PdMPAV2/SiO2, PdMPAV2/ZrO2, PdMPAV2/Nb2O5 and Pd/Al2O3. Of the catalysts studied the PdMPAV2/Al2O3 catalyst was able to achieve the highest selectivity of THFAL (95%) under moderate reaction conditions (150°C, 2.5 MPa, 6 h) using isopropanol as a solvent and the weight percentage of palladium is only 0.5% which is the least among all the previously reported catalysts. The other catalysts investigated achieved yields of 50-75% under the same reaction conditions. The higher selectivity obtained using the alumina supported catalyst was explained using a range of physicochem. methods: XRD, temperature programmed reduction (H2-TPR), CO pulse chemisorption, BET surface area anal. and SEM. The H2-TPR results showed that PdMPAV2/Al2O3 contained a significant amount of Pd that was reduced at the lowest temperature (~100°C) observed for all the materials investigated, which indicated that this catalyst most likely contained a significantly greater amount of more highly dispersed/higher surface area Pd than the other catalysts investigated which is also supported by CO pulse chemisorption results. XPS results supported the presence of Pd(0) which is stabilized by a heteropoly acid framework, and TEM and CO chemisorption results illuminated the fact that the well dispersed and smaller palladium cluster is one of the crucial factors for the better activity of PdMPAV2/Al2O3. The effects of the variation of temperature, pressure, time and catalyst concentration were investigated for the best performing catalyst (PdMPAV2/Al2O3).

Sustainable Energy & Fuels published new progress about Chemisorption. 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

Xiao, Peng; He, Xiaojie; Zheng, Feng; Lu, Qinghua published the artcile< Super-heat resistant, transparent and low dielectric polyimides based on spirocyclic bisbenzoxazole diamines with Tg > 450°C>, Name: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is polyimide spirocyclic bisbenzoxazole diamine glass transition temperature.

Maintaining ultra-high heat resistance and sufficient colorless transparency at the same time is a challenge for polymer materials because of conflicting design principles, but such materials are urgently needed for some optoelectronic devices. In this study, four new isomeric diamines with a spirocyclic bisbenzoxazole structure were synthesized, and their polyimides were prepared by condensation with com. diamines, 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and cyclobutane-1,2,3,4-tetracarboxylic acid dianhydride (CBDA) followed by chem. imidization. The resultant polyimide (PI) films have excellent optical transparency with cut-off wavelengths in the range of 346 nm-380 nm, and 85%-90% transmittance at 550 nm. Also, these PIs possessed excellent solubility in common organic solvents, even in low-boiling-point solvents, such as chloroform, dichloromethane and THF. Most importantly, the colorless polyimides displayed a super-high glass transition temperature (Tg), high thermal stability, and favorable mech. properties, and their Tg reached 491°. The polyimides possessed low moisture absorptions of 0.52%-0.61% and low dielec. constants (Dk) of 2.32-2.93. The excellent comprehensive properties of the spirocyclic bisbenzoxazole-containing colorless transparent polyimides (CPIs) render these materials promising candidates for optical and optoelectronic applications.

Polymer Chemistry published new progress about Absorption. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Name: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone.

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

Hodgkinson, Alison; Wall, Clare; Wang, Wendan; Szeto, Ignatius M.; Ye, Wenhui; Day, Li published the artcile< Nucleotides: an updated review of their concentration in breast milk>, Product Details of C9H13N2O9P, the main research area is review nucleotide concentration breast milk; Clinical study; Colostrum; Mature milk; Nucleotides concentrations; Transition milk.

A review. Our knowledge about the complexity of human milk, in particular fatty acid, protein, and oligosaccharide profiles, has increased considerably in recent years. However, little attention has been paid to nucleotides, which account for ∼2% to 5% of the nonprotein nitrogen fraction of breast milk and provide important cellular and metabolism functions for the infant. We examined literature published in the past 25 years to provide an updated review of concentrations of nucleotides in breast milk across lactational stages in mothers around the world. The free mononucleotides found in highest concentrations in breast milk are, from highest to lowest in the order of CMP, UMP, and AMP, GMP, and IMP. Levels of nucleotides varied considerably amongst individual mothers and with stage of lactation. They could be further influenced by time of day and season and the mothers diet. Levels of free nucleotides varied between studies undertaken in different regions; however, in studies that measured total potentially available nucleotides levels, regional differences were not apparent. Some studies report higher amounts in colostrum and transition milk compared with mature milk, whereas other studies report the converse. Recently, clin. studies showed that there are benefits to supplement nucleotides in infant formula. Although comparing data in the literature remains a challenge because of different milk collection methodologies and measurement protocols used by different studies, the information may provide insights for designing of formula products for infant at different stages of development.

Nutrition Research (New York, NY, United States) published new progress about Colostrum. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Product Details of C9H13N2O9P.

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

Ramos, Ruben; Peixoto, Andreia F.; Arias-Serrano, Blanca I.; Soares, O. Salome G. P.; Pereira, Manuel F. R.; Kubicka, David; Freire, Cristina published the artcile< Catalytic Transfer Hydrogenation of Furfural over Co3O4-Al2O3 Hydrotalcite-derived Catalyst>, SDS of cas: 97-99-4, the main research area is transfer hydrogenation furfural cobalt alumina hydrotalcite catalyst.

The hydrogenation of furfural by catalytic hydrogen transfer to produce furfuryl alc. has been investigated over a series of mixed oxides derived from hydrotalcite catalysts. Three different catalysts containing Ni, Co and Zn phases on an Al-rich amorphous support were synthesized and characterized. The catalytic performances were evaluated in a batch stirred reactor using 2-propanol as a solvent and hydrogen donor, with Co3O4-Al2O3 showing the highest activity and selectivity to FA (74% yield; 97% selectivity). The effects of temperature (T=120-180°C) and reaction time (t=30 min-24 h) were also studied, reaching a FA maximum yield of 92% at 150°C after 24 h. The Co3O4-Al2O3 catalyst showed a loss of activity after the first run, which can be easily restored by a simple calcination treatment. The results establish a catalytic route to produce valuable furfuryl alc. over 3d-transition metal-based catalysts without any external hydrogen supply.

ChemCatChem published new progress about Biomass. 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

Chen, Xiaozhen; Wu, Youjia; Huang, Liying; Yang, Lijuan; Hong, Ruixia; Yao, Hong; Li, Shaoguang published the artcile< Magnetic dispersive solid-phase micro-extraction combined with high-performance liquid chromatography for determining nucleotides in Anoectochilus roxburghii (Wall.) Lindl>, Related Products of 58-97-9, the main research area is magnetic dispersive solid phase microextraction HPLC Anoectochilus nucleotide; Anoectochilus roxburghii (Wall.) Lindl; Fe(3)O(4)@GO nano-adsorbent; High-performance liquid chromatography (HPLC); Magnetic dispersive solid-phase micro-extraction; Nucleotides; Sample pretreatment.

A novel, simple, and efficacious anal. method for determining of nucleotides in Anoectochilus roxburghii (Wall.) Lindl (A. roxburghii) was developed. Magnetic dispersive solid-phase micro-extraction (MDSPME) combined with high-performance liquid chromatog. was applied for extraction and determination of three nucleotides, such as adenosine-5′-monophosphate (AMP), uridine-5′-monophosphate (UMP) and guanosine-5′-monophosphate (GMP) in A. roxburghii from different sources. The structure and morphol. of magnetic nanoparticles, Fe3O4@GO, were illustrated by Fourier-transform IR (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and Thermagravimetric anal. (TGA) techniques. The effects of different extraction conditions on extraction efficiency were investigated and optimized. The optimum extraction conditions were performed as follows: 40.0 mg Fe3O4@GO were dispersed in 30 mL adsorption solution (pH 3.50, 2 μg/mL), 50 mM NaOH was employed for elution with 12 min of ultra-sonication at 40 °C. Under the aforementioned extraction conditions, the Fe3O4@GO nano-adsorbent obtained an excellent adsorption property. The corresponding linearity range for all three analytes exhibited a good linearity (r2 ≥ 0.9982) and notable added recoveries ranging from 88.4% to 109.8%, whereas the limit of quantitation was between 0.8-8 ng/mL. The enrichment factors (EF) were between 174 and 255. The proposed method showed the advantages of full purification, high EF, simplicity, and good recovery. The method was also successfully applied to nucleotides extraction and determination in A. roxburghii, showing superior reproducibility and high sensitivity. Based on this, the method could be expected to provide a novel exptl. means and developmental direction for improving pretreatment and purification of nucleotides, reducing matrix effects as much as possible, in traditional Chinese medicinal materials or biol. specimens.

Journal of Pharmaceutical and Biomedical Analysis published new progress about Adsorption. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Related Products of 58-97-9.

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

Jasiobedzki, Wieslaw; Wozniak-Kornacka, Janina published the artcile< Electron spectra and synthesis of some α-tetrahydrofurandiones and -diols with phenyl and tert-butyl substituents in 2,5 positions>, Reference of 5455-94-7, the main research area is hydration tetrahydrofurandione UV; tetrahydrofuranone UV hydration; furandiol tetrahydro UV.

The effect of hydration on the UV spectra of α-diones I (R = R1 = R2 = R3 = Me; R = R2 = Ph, R1 = R3 = Me3C; R = R1 = R2 = Ph, R3 = CMe3; R = R1 = R2 = R3 = Ph) was compared to that on similarly structured tetrahydrofuranones, e.g., II. The UV spectrum of 3,4-tetrahydrofurandiols and 3-tetrahydrofuranols were determined

Bulletin de l’Academie Polonaise des Sciences, Serie des Sciences Chimiques published new progress about Hydration reaction. 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Reference of 5455-94-7.

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