Month: October 2022

Pirmoradi, Maryam; Janulaitis, Nida; Gulotty, Robert J. Jr; Kastner, James R. published the artcile< Bi-Metal-Supported Activated Carbon Monolith Catalysts for Selective Hydrogenation of Furfural>, SDS of cas: 97-99-4, the main research area is bi metal supported carbon monolith catalyst hydrogenation furfural.

Activated carbon monolith (ACM) catalysts were impregnated with Pd, Pd-Cu, and Pd-Fe for continuous hydrogenation of aqueous furfural (FUR). The effect of temperature, pressure, and liquid residence time on product selectivity and space-time yield (STY) was determined Adding a second metal to Pd/ACM shifted the selectivity of the catalyst from 2-methylfuran (2MF) and 2-methyltetrahydrofuran (2MTHF) to furfuryl alc. (FA) and tetrahydrofurfuryl alc. (THFA), resp., over the range of tested temperatures and pressures. High STYs of 272 g/Lcat/h (1089 g/kg-cat/h) for THFA and 143 g/Lcat/h (574 g/kg-cat/h) for FA were achieved using Pd-Fe/ACM at 180°C and 300 psig. Similarly, adding Fe increased the FUR, FA, and THFA turnover frequency by a factor of 3, 4, and 60, resp. The effect was not as pronounced when adding Cu. The effect of acetic acid, an impurity present in crude FUR, on FUR conversion and product selectivity was determined The surface area anal. indicated a relatively low loss of surface area over 13 hydrogenation reactions on each catalyst. The presence of a second metal on the monolith catalyst stabilized the Pd particles, reduced the leaching, and altered the product selectivity.

Industrial & Engineering Chemistry Research published new progress about Hydrogenation. 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

Nazarski, Ryszard B. published the artcile< Physical image vs structure relation: part 12 - structure of 2,2,5,5-tetramethyl-dihydro-furan-3-one oxime and its protonated forms through isomerization and NMR spectra>, Product Details of C8H14O2, the main research area is structure methyldihydrofuranone oxime protonated form thermal isomerization NMR GIAO.

The study of an isomeric A/B mixture of the title oxime 1, by photolytic or thermal E,Z-isomerization and NMR measurement including 1H{1H}-NOE difference spectra, led to assignment of the E configuration to its predominating form A. The 1H/13C data were interpreted in terms of steric overcrowding of both forms, especially of the thermolabile photoproduct B. Four classical (empirical) NMR methods of elucidating the oxime geometry were critically tested on these results. Unexpected vapor-phase photoconversion A→B in the window glass-filtered solar UV and spectroscopic findings on their protonated states were discussed, as well. The kinetically controlled formation of the N-protonated species (Z)-5+ was proved exptl. In addition, some 1H NMR assignments reported for structurally similar systems were rationalized (3 and 4) or revised (1 and 7-9) with the GIAO-DFT(B3LYP) and/or GIAO-HF calculational results.

Journal of Physical Organic Chemistry published new progress about Cis-trans thermal isomerization. 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Product Details of C8H14O2.

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

Yeh, Jyun-Yi; Matsagar, Babasaheb M.; S. Chen, Season; Sung, Hsiang-Ling; Tsang, Daniel C. W.; Li, Yi-Pei; Wu, Kevin C.-W. published the artcile< Synergistic effects of Pt-embedded, MIL-53-derived catalysts (Pt@Al2O3) and NaBH4 for water-mediated hydrogenolysis of biomass-derived furfural to 1,5-pentanediol at near-ambient temperature>, Application of C5H10O2, the main research area is synergistic platinum embedded catalyst Al2O3 NaBH4 hydrogenolysis biomass.

We demonstrate an effective and selective conversion of biomass-derived furfural (FAL) to 1,5-pentanediol (1,5-PD) with high yields through a water-mediated hydrogenolysis process under mild reaction conditions (45°C, aqueous media). A novel alumina-supported platinum catalyst (Pt@Al2O3) with high-loading and uniform distribution of Pt nanoparticles is prepared through in situ synthesis of Pt-embedded metal-organic frameworks (i.e., MIL-53(Al)-NH2). As a typical example, a high yield of 75.2% 1,5-PD can be achieved from FAL conversion. A possible reaction mechanism is proposed based on the exptl. and computational findings, including XPS anal., kinetic studies, acidity measurements, and d. functional theory (DFT) calculations The high effectiveness of the proposed system is attributed to (1) the strong metal support interaction (SMSI) between Pt and penta-coordination aluminum, and (2) the synergistic effects of Bronsted acidic alumina support and the presence of sodium metaborate (NaBO2). Sodium borohydride (NaBH4) acts as both a hydrogen donor and a precursor for NaBO2, which results in an exclusive FAL to 1,5-PD (i.e., no 1,2-pentanediol) by regulating the water-mediated hydrogenolysis pathway as revealed by experiments and DFT calculations The reaction strategy proposed in this study has also manifested remarkable versatility for a wide range of furan derivatives

Journal of Catalysis published new progress about Biomass. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Application of C5H10O2.

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

Tang, Feiying; Wang, Liqiang; Dessie Walle, Maru; Mustapha, Abdulhadi; Liu, You-Nian published the artcile< An alloy chemistry strategy to tailoring the d-band center of Ni by Cu for efficient and selective catalytic hydrogenation of furfural>, Electric Literature of 97-99-4, the main research area is nickel copper alloy catalyst furfural hydrogenation morphol textural property.

Nickel is a promising catalyst for the hydrogenation of furfural (FA) into furfuryl alc. (FOL) and tetrahydrofurfuryl alc. (TFOL). However, slow H* desorption and low catalytic selectivity limit its practical application. Herein, we employed an alloying strategy to tailoring the d-band center of Ni by Cu for efficient and selective catalytic hydrogenation of furfural. A series of Ni-Cu alloy catalysts (NiCux/C) were prepared by pyrolyzing NiCux-BTC (a MOF containing Cu and Ni) precursors. Theor. calculation demonstrates that Ni exhibits a downshifted d-band center once alloyed by Cu. This change can not only promote the desorption of H from Ni surface to improve the catalytic activity but also thermodynamically favor the transformation of adsorption orientation of FA (from a flat orientation on Ni to a tilted one on Ni-Cu alloy) to enable the selective conversion of FA into FOL or TFOL on demand. NiCu0.33/C catalyst exhibits enhanced activity and selectivity for FA hydrogenation compared to pure Ni and Cu.

Journal of Catalysis published new progress about Density of states. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Electric Literature of 97-99-4.

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

Shirali, Aditya S; Zagzag, Jonathan; Chiang, Yi-Ju; Huang, He; Zhang, Miao; Habra, Mouhammed Amir; Grubbs, Elizabeth G; Fisher, Sarah B; Perrier, Nancy D; Lee, Jeffrey E; Graham, Paul H published the artcile< Differences in Clinicopathologic Behavior of Oncocytic Adrenocortical Neoplasms and Conventional Adrenocortical Carcinomas.>, Reference of 58-97-9, the main research area is .

BACKGROUND: Oncocytic adrenocortical neoplasms (OANs) are rare endocrine tumors that present as a spectrum from benign to malignant. The outcomes after surgical resection of the oncocytic variant of adrenocortical carcinoma remain poorly understood. We sought to characterize the clinicopathologic features of OAN and compare oncocytic adrenocortical carcinoma (OAC) with conventional adrenocortical carcinoma (ACC). PATIENTS AND METHODS: Adult patients who underwent adrenalectomy for OAN or ACC between January 1990 and September 2020 were identified. Demographics, clinicopathologic factors, American Joint Committee on Cancer stage, and cancer-related outcomes were reviewed. A matched cohort analysis of disease-free survival (DFS) and overall survival (OS) was performed between patients with OACs and those with ACCs. RESULTS: Forty-one patients with OAN and 214 patients with ACC were included. The OAN cohort median age was 45.2 years [interquartile ratio (IQR) 38.5-54.0 years], and 61.0% were female. OANs were benign (n = 11), of uncertain malignant potential (UMP, n = 9), or OAC (n = 21). Disease recurrence occurred in 12 (57.1%) patients with OAC compared with 1 (11.1%) and 0 patients with UMP or benign OAN, respectively (p < 0.001). Seven (33.3%) patients with OAC died during follow-up compared with 0 patients with UMP or benign OAN (p = 0.020). Kaplan-Meier survival analysis found no difference in DFS between ACC and OAC groups before (p = 0.218) and after 2:1 matching (p = 0.417). Overall survival was shorter for patients who had ACC compared with those who had OAC (p = 0.031), but the difference was not evident with matched analysis (p = 0.200). CONCLUSIONS: OAN presents as a spectrum from benign indolent tumors to aggressive carcinomas. OACs demonstrate similar clinicopathologic behavior and recurrence-free and overall survival when matched to conventional ACCs. Annals of surgical oncology published new progress about 58-97-9. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Reference of 58-97-9.

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

Sornkamnerd, Saranyoo; Sasaki, Shuhei; Mitsumata, Tetsu; Takada, Kenji; Okada, Tomohiro; Ando, Shinji; Kaneko, Tatsuo published the artcile< Orientation Analysis of Polymer Chains in Optically Transparent Biopolyimides Having Rigid and Bending Backbones>, Name: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is optically transparent biopolyimide polymer chain orientation.

Optically transparent and heat-resistant polymer films are useful in the field of organic glasses usable for elec. insulators for panels, windows, optical devices, etc. A series of biopolyimides having non-π-conjugated backbones prepared using a renewable diamine, 4,4′-diaminotruxillic acid di-Me esters, and various dianhydride monomers were prepared and cast onto substrates to form transparent films with high heat resistances and good elec. resistance. The second order orientation coefficients (P200) of the biopolyimide films were evaluated by polarized attenuated total reflection Fourier-transform IR spectroscopy, and the P200 values for the C-N stretching vibrations at a wavenumber of 1365 cm-1 displayed a good correlation with that for the aromatic C-C stretching at 1510 cm-1, regardless of the dianhydride structure. The in-plane/out-of-plane birefringence and coefficients of linear thermal expansion exhibited strong correlations with P200 except for those of a few samples. Most of the biopolyimide films exhibited good transparencies with low birefringence and high elec. resistance, which are applicable to flexible substrates with a low coefficient of thermal expansion for panel displays.

ChemistrySelect published new progress about Birefringence. 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

Lens, Sabela; Lazarus, Jeffrey V published the artcile< The paediatric population: the forgotten element to eliminating hepatitis C virus.>, Safety of ((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 .

There is no abstract available for this document.

The lancet. Gastroenterology & hepatology published new progress about 58-97-9. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Safety of ((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

Yuan, Bingbing; Li, Pengfei; Wang, Peng; Yang, Hao; Sun, Honghong; Li, Peng; Sun, Haixiang; Niu, Q. Jason published the artcile< Novel aliphatic polyamide membrane with high mono-/divalent ion selectivity, excellent Ca2+, Mg2+ rejection, and improved antifouling properties>, Quality Control of 4415-87-6, the main research area is aliphatic polyamide nanofiltration membrane preparation water desalination ion rejection.

Monomer design and reconstruction is typically a preferred route to tune the inner structure and screen the performance of polyamide nanofilms for their efficiency and ease of scaling up in industrial production Herein, two kinds of novel acyl chloride monomers, 1,2,3,4-cyclobutane tetracarboxylic acid chloride (BTC) and 1,2,4,5-cyclohexanetetracarboxylic acid chloride (HTeC), have been designed and synthesized. The BTC and HTeC monomers can rapidly react with amine mol. at interface to form an aliphatic polyamide nanofilm that is denser than that of TMC based polyamide membrane. The resulting mean effective pore size of the BTC and HTeC polyamide nanofilms is 0.184 nm and 0.197 nm, which is lower than that of the TMC nanofilm at 0.238 nm. Desalination experiments revealed that the aliphatic polyamide membrane shows more than a 98% rejection rate for CaCl2, MgCl2, and MgSO4 and a water flux of 84.4 kg m-2 h-1 MPa-1 (for 2000 ppm MgSO4). Moreover, the ion selectivity of Na+/Mg2+ and Na+/Ca2+ of the BTC membrane is as high as 126 and 31.5, resp. These are much higher than those of the related TMC and com. nanofiltration membranes. Fouling experiments indicate that the flux decline rate (FDR) of the aliphatic polyamide membrane is only 38%, whereas the FDR of the full-aromatic polyamide membrane is 60%. Further investigations confirmed that surface roughness is the main factor affecting the fouling behaviors of polyamide membranes. Our results demonstrate that BTC and HTeC monomers are unique potential materials in the fabrication of nanofiltration membranes used for water treatment such as water softening and ion sieving.

Separation and Purification Technology published new progress about Anions (mono and divalent). 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Quality Control of 4415-87-6.

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

Netto-Ferreira, J. C.; Wintgens, V.; Scaiano, J. C. published the artcile< Lifetimes of biradicals produced in the Norrish Type I reaction of methyl-substituted 2-tetralones>, Synthetic Route of 5455-94-7, the main research area is Norrish photolysis biradical lifetime tetralone.

The Norrish Type I biradicals derived from 2-tetralones decay by a competition of recyclization to the starting material, intramol. disproportionation to yield aldehydes and decarbonylation. The last path is only favored in the case of 3,3-dimethylated derivatives while, in the other extreme, the parent 2-tetralone is essentially photostable. The biradical lifetimes are around 140 ns in benzene and 40 ns or less in nonaromatic solvents; they show little sensitivity to the solvent polarity and hydrogen bonding ability. The remarkable stabilization of the biradical in benzene is probably due to specific interactions between the acyl center in the biradical and benzene, since similar effects have not been observed in other biradicals.

Journal of Photochemistry and Photobiology, A: Chemistry published new progress about Biradicals Role: RCT (Reactant), RACT (Reactant or Reagent). 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Synthetic Route of 5455-94-7.

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

Fovanna, Thibault; Campisi, Sebastiano; Villa, Alberto; Kambolis, Anastasios; Peng, Gael; Rentsch, Daniel; Krocher, Oliver; Nachtegaal, Maarten; Ferri, Davide published the artcile< Ruthenium on phosphorous-modified alumina as an effective and stable catalyst for catalytic transfer hydrogenation of furfural>, Name: (Tetrahydrofuran-2-yl)methanol, the main research area is ruthenium phosphorus modified alumina catalyst preparation furfural hydrogenation.

Supported ruthenium was used in the liquid phase catalytic transfer hydrogenation of furfural. To improve the stability of Ru against leaching, phosphorus was introduced on a Ru/Al2O3 based catalyst upon impregnation with ammonium hypophosphite followed by either reduction or calcination to study the effect of phosphorus on the physico-chem. properties of the active phase. Characterization using X-ray diffraction, solid state 31P NMR spectroscopy, X-ray absorption spectroscopy, temperature programmed reduction with H2, IR spectroscopy of pyridine adsorption from the liquid phase and transmission electron microscopy indicated that phosphorus induces a high dispersion of Ru, promotes Ru reducibility and is responsible for the formation of acid species of bronsted character. As a result, the phosphorus-based catalyst obtained after reduction was more active for catalytic transfer hydrogenation of furfural and more stable against Ru leaching under these conditions than a benchmark Ru catalyst supported on activated carbon.

RSC Advances published new progress about Calcination. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Name: (Tetrahydrofuran-2-yl)methanol.

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