Category: Tetrahydrofurans

Garavagno, Maria de los A.; Hernandez, Federico J.; Jara-Toro, Rafael A.; Mahecha, Genesys; Barrera, Javier A.; Taccone, Raul A.; Pino, Gustavo A. published the artcile< Rate coefficient and mechanism of the OH-initiated degradation of cyclobutanol: A combined experimental and theoretical study>, Safety of (Tetrahydrofuran-2-yl)methanol, the main research area is cyclobutanol OH initiated degradation rate coefficient exptl theor study.

The degradation process of cyclobutanol (cButOH) by hydroxyl radical (OH), under atm. conditions, (750 ± 10) Torr of air and (296 ± 2) K, has been studied. The rate coefficient for the title reaction (k296K = (7.3 ± 0.6) x 10-12 cm3 mol.-1 s-1) was determined at 296 K by the conventional relative-rate method. Electronic structure calculations with uCCSD(T)/uBHandHLYP/aug-cc-PVDZ were conducted to study the reaction mechanism. The global rate coefficient was also calculated using the transition state theory with tunneling corrections, obtaining a value of 5.4 x 10-12 cm3 mol.-1 s-1 in agreement with the exptl. determination Addnl., reaction products identification in clean and NOx-contaminated atmospheres was performed for the first time. The identified reaction products and their corresponding yields (YP) depend on the environment composition in which the reaction is studied. In the absence of NOx, cyclobutanone (cButanone) was the only identified product, with YcButanone = (0.66 ± 0.08). In NOx-contaminated atmospheres, in addition to cButanone, THF (THF), 2-nitro-1-butanol (2N1B), 3-nitro-2-butanol (3N2B) and 2-methyl-2-nitro-1-propanol (2M2N1P), were also identified as primary reaction products. Under this condition, we were able to determine only the yields of cButanone and THF (YcButanone = 0.38 ± 0.05 and YTHF = 0.28 ± 0.02). A likely reaction mechanism for the observed products is proposed and the atm. implications are discussed.

Atmospheric Environmentpublished new progress about Alcohols, nitro Role: POL (Pollutant), OCCU (Occurrence). 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Safety of (Tetrahydrofuran-2-yl)methanol.

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

Takemasa, Chiaki; Chino, Teppei; Ishige, Ryohei; Ando, Shinji published the artcile< Anisotropic photoconductivity of aromatic and semi-aliphatic polyimide films: Effects of charge transfer, molecular orientation, and polymer chain packing>, Recommanded Product: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone, the main research area is polyimide film aromatic polymer chain packing mol orientation photoconductivity.

The anisotropic photoconductive properties of polyimide (PI) films prepared using seven types of dianhydrides and a diamine containing a diphenyl-benzidine structure featuring rigid linear structure and strong electron-donating ability were analyzed. Photoirradiation wavelength dependences of the in-plane and out-of-plane photocurrents, which are known as anisotropic photocurrent spectra, were investigated in comparison with optical absorption spectra, the degrees of mol. aggregation, in-plane/out-of-plane orientation of PI chains, and ordered structures formed in film state. We have previously reported that intermol. charge transfer (CT) interaction is a key factor for increasing the out-of-plane photoconductivity of PI films because they determine the efficiency of charge separation However, when sufficient charge carriers are generated in thin PI films via photo irradiation, in which penetration depth of irradiated light is sufficiently larger than the film thickness, suppression of charge recombination by reducing mol. chain packing is rather effective at enhancing both the in-plane and out-of-plane photoconductivity This is because the mobility of carriers is significantly increased in the dense aggregation structures, and thus collisions between carriers becomes more frequent, which led to higher recombination efficiency. Furthermore, the photocurrent anisotropy was increased as the degree of in-plane orientation of the main PI chains increased, which agrees with the fact that charged carriers are preferentially transported between PI chains. Accordingly, promoting charge transport efficiency by reducing PI chain packing and increasing the out-of-plane orientation of PI chains are essential to increase the in-plane photoconductivity of PI films.

Polymerpublished new progress about Molecular orientation. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Recommanded Product: Cyclobuta[1,2-c:3,4-c’]difuran-1,3,4,6(3aH,3bH,6aH,6bH)-tetraone.

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

Date, Nandan S.; Hengne, Amol M.; Huang, K.-W.; Chikate, Rajeev C.; Rode, Chandrashekhar V. published the artcile< One pot hydrogenation of furfural to 2-methyl tetrahydrofuran over supported mono- and bi-metallic catalysts>, Formula: C5H10O2, the main research area is iron nickel metallic hydrogenation catalyst furfural methyl THF.

2-Methyltetrahydrofuran is a valuable com. product that can be obtained by direct hydrogenation of furfural. In the present study, among several carbon supported bimetallic Ir-Ni catalysts with different loadings screened, 4% Ir-4% Ni/C catalyst showed excellent activity in terms of direct conversion (99%) to 2-MeTHF with a maximum selectivity of ∼74% at 220°C and 750 psig, suppressing the formation of side chain as well as ring opening products. The catalytic activity was found to be mainly affected by catalyst preparation methods, metal loadings, surface composition, temperature, pressure and catalyst loading. HR-TEM and STEM revealed well dispersed Ir-Ni NPs having the particle sizes in the range of 2 to 5 nm. Different phases of Ir i. e. Ir° and IrO2 as well as oxygen vacancies were found to be responsible for hydrogenation of furfural to 2-Me furan while, Ni° and NiO were responsible for further hydrogenation to 2-MeTHF. The synergic effect between Ir and Ni was established through XPS, H2-TPR anal. With the help of some control experiments, the plausible reaction pathway was also proposed. The catalyst prepared by co-impregnation method found more effective than prepared by sequential addition method. At lower Ni loadings of 1% and 2%, low temperature of 160°C as well as at low H2 pressure of 250 psig, mixture of furfuryl alc. and 2-Me furan were formed selectively. Catalyst could be successfully reused up to 3 times without leaching of metals.

ChemistrySelectpublished new progress about Charcoal Role: CAT (Catalyst Use), PRP (Properties), USES (Uses). 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Formula: C5H10O2.

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

Pillon, Monica C.; Frazier, Meredith N.; Dillard, Lucas B.; Williams, Jason G.; Kocaman, Seda; Krahn, Juno M.; Perera, Lalith; Hayne, Cassandra K.; Gordon, Jacob; Stewart, Zachary D.; Sobhany, Mack; Deterding, Leesa J.; Hsu, Allen L.; Dandey, Venkata P.; Borgnia, Mario J.; Stanley, Robin E. published the artcile< Cryo-EM structures of the SARS-CoV-2 endoribonuclease Nsp15 reveal insight into nuclease specificity and dynamics>, Category: tetrahydrofurans, the main research area is cryoelectron microscopy SARSCoV2 NSP15 conformational dynamics crystal structure.

Abstract: Nsp15, a uridine specific endoribonuclease conserved across coronaviruses, processes viral RNA to evade detection by host defense systems. Crystal structures of Nsp15 from different coronaviruses have shown a common hexameric assembly, yet how the enzyme recognizes and processes RNA remains poorly understood. Here we report a series of cryo-EM reconstructions of SARS-CoV-2 Nsp15, in both apo and UTP-bound states. The cryo-EM reconstructions, combined with biochem., mass spectrometry, and mol. dynamics, expose mol. details of how critical active site residues recognize uridine and facilitate catalysis of the phosphodiester bond. Mass spectrometry revealed the accumulation of cyclic phosphate cleavage products, while anal. of the apo and UTP-bound datasets revealed conformational dynamics not observed by crystal structures that are likely important to facilitate substrate recognition and regulate nuclease activity. Collectively, these findings advance understanding of how Nsp15 processes viral RNA and provide a structural framework for the development of new therapeutics.

Nature Communicationspublished new progress about Catalysis (phosphodiester bonds). 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Category: tetrahydrofurans.

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

Cocq, Aurelien; Leger, Bastien; Noel, Sebastien; Bricout, Herve; Djedaini-Pilard, Florence; Tilloy, Sebastien; Monflier, Eric published the artcile< Anionic Amphiphilic Cyclodextrins Bearing Oleic Grafts for the Stabilization of Ruthenium Nanoparticles Efficient in Aqueous Catalytic Hydrogenation>, Name: (Tetrahydrofuran-2-yl)methanol, the main research area is oleic succinyl beta cyclodextrin ruthenium nanoparticle catalyst preparation; petrosource biosource unsaturated compound benzene furfural hydrogenation ruthenium catalyst.

Oleic succinyl β-cyclodextrin was proved to be efficient for the stabilization of ruthenium nanoparticles (NPs) in aqueous medium. The catalytic activity of these NPs was evaluated in the aqueous hydrogenation of petrosourced and biosourced unsaturated compounds such as benzene and furfural derivatives The catalytic system can be easily recycled and reused up to nine runs without any loss of activity and selectivity, demonstrating its robustness.

ChemCatChempublished new progress about Alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 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

Xue, Ying; Jin, Wei; Xu, Xian-Shun; Yong, Li; Hu, Bin; Xiong, Jing; Hu, Xue-Mei; Qing, Lin-Sen; Xie, Jing published the artcile< Quality evaluation of Tricholoma matsutake based on the nucleic acid compounds by UPLC-TOF/MS and UPLC-QqQ/MS>, Product Details of C9H13N2O9P, the main research area is Tricholoma nucleic acid UPLC TOF MS Southwest China; Tricholoma matsutake; UPLC-QqQ/MS; UPLC-TOF/MS; nucleic acid compound; quality evaluation.

So far, there has been no quality evaluation of Tricholoma matsutake. Nucleic acid compounds are a kind of functional ingredient in T. matsutake that is beneficial to human health. In this study, a UPLC-TOF/MS method was first used to scan and identify the potential nucleic acid compounds in T. matsutake. Based on the calculation of the mol. formula and subsequent confirmation by authentic standards, 15 nucleic acid compounds were unambiguously identified: adenosine, cytidine, guanosine, inosine, thymidine, uridine, xanthosine dehydrate, 2′- deoxyadenosine, 2′-deoxycytidine, 2′-deoxyguanosine, 2′-deoxyuridine, adenosine 5′- monophosphate, CMP, GMP, and uridine 5′- monophosphate. Then, a UPLC-QqQ/MS method was developed for the subsequent quant. anal. After validating the limits of quantification, detection, precision, repeatability, and recovery through a calibration curve, the content of 15 nucleic acid compounds was determined by the proposed UPLC-QqQ/MS method in 80 T. matsutake samples collected from different regions in Sichuan province, Southwest China. After the statistical anal., we suggest that the total content of nucleic acid compounds in the qualified T. matsutake should be higher than 24.49 mg/100 g. The results indicated that the combined use of UPLC-TOF/MS and UPLC-QqQ/MS is efficient for fast identification and determination of nucleic acid compounds to comprehensively evaluate the quality of T. matsutake.

Moleculespublished new progress about Nucleic acids Role: THU (Therapeutic Use), BIOL (Biological Study), USES (Uses). 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, Product Details of C9H13N2O9P.

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

Mironenko, Roman M.; Belskaya, Olga B.; Likholobov, Vladimir A. published the artcile< Approaches to the synthesis of Pd/C catalysts with controllable activity and selectivity in hydrogenation reactions>, Application In Synthesis of 97-99-4, the main research area is review palladium carbon hydrogenation catalyst.

A review. C-supported Pd catalysts are widely used for hydrogenation of various organic compounds in the fine chem. industry. The nanoscale geometry and electronic structure of supported Pd nanoparticles play a crucial role in providing the necessary catalytic properties. To improve catalytic activity and selectivity of Pd nanoparticles, it is possible to fine tune their intrinsic properties (e.g., size and oxidation state) by controlling the chem. transformations at different stages of catalyst preparation Recent years have seen considerable advancement in developing new catalyst preparation techniques as well as in understanding the mechanism of active site formation. This review summarizes some of the existing approaches to regulating the catalytic properties of C-supported Pd by variation of the C support, the composition of Pd precursor and its reduction conditions, as well as the addition of a 2nd active metal. The data presented may be useful for researchers developing efficient Pd/C catalysts for hydrogenation of polyfunctional organic compounds

Catalysis Todaypublished new progress about Carbon nanofibers Role: CAT (Catalyst Use), NAN (Nanomaterial), PEP (Physical, Engineering or Chemical Process), PRP (Properties), TEM (Technical or Engineered Material Use), USES (Uses), PROC (Process). 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Application In Synthesis of 97-99-4.

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

Bommana, Sankhya; Richards, Gracie; Kama, Mike; Kodimerla, Reshma; Jijakli, Kenan; Read, Timothy D.; Dean, Deborah published the artcile< Metagenomic shotgun sequencing of endocervical, vaginal, and rectal samples among Fijian women with and without Chlamydia trachomatis reveals disparate microbial populations and function across anatomic sites: a pilot study>, 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 Chlamydia metagenomics shotgun sequencing endocervix vagina rectum anatomy; Chlamydia trachomatis; endocervical microbiome; metabolomics; metagenomic shotgun sequencing; pathogenesis; rectal microbiome; sexually transmitted infections; vaginal microbiome.

Chlamydia trachomatis is a sexually transmitted pathogen and a global public health concern. Little is known about the microbial composition and function across endocervical, vaginal, and rectal microbiomes in the context of C. trachomatis infection. We evaluated the microbiomes of 10 age-matched high-risk Fijian women with and without C. trachomatis using metagenomic shotgun sequencing (MSS). Lactobacillus iners and Lactobacillus crispatus dominated the vagina and endocervix of uninfected women. Species often found in higher relative abundance in bacterial vaginosis (BV) – Mageeibacillus indolicus, Prevotella spp., Sneathia spp., Gardnerella vaginalis, and Veillonellaceae spp. – were dominant in C. trachomatis-infected women. This combination of BV pathogens was unique to Pacific Islanders compared to previously studied groups. The C. trachomatis-infected endocervix had a higher diversity of microbiota and microbial profiles that were somewhat different from those of the vagina. However, community state type III (CST-III) and CST-IV predominated, reflecting pathogenic microbiota regardless of C. trachomatis infection status. Rectal microbiomes were dominated by Prevotella and Bacteroides, although four women had unique microbiomes with Gardnerella, Akkermansia, Bifidobacterium, and Brachyspira. A high level of microbial similarity across microbiomes in two C. trachomatis-infected women suggested intragenitorectal transmission. A number of metabolic pathways in the endocervix, driven by BV pathogens and C. trachomatis to meet nutritional requirements for survival/growth, 5-fold higher than that in the vagina indicated that endocervical microbial functions are likely more diverse and complex than those in the vagina. Our novel findings provide the impetus for larger prospective studies to interrogate microbial/microbiome interactions that promote C. trachomatis infection and better define the unique genitorectal microbiomes of Pacific Islanders.

Microbiology Spectrumpublished new progress about Actinobacteria. 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

Zhang, Qingfei; Kuang, Gaizhen; Zhou, Dongfang; Qi, Yanxin; Wang, Mingzhe; Li, Xiaoyuan; Huang, Yubin published the artcile< Photoactivated polyprodrug nanoparticles for effective light-controlled Pt(IV) and siRNA codelivery to achieve synergistic cancer therapy>, COA of Formula: C8H4O6, the main research area is photoactivated platinum polyprodrug nanoparticle Bcl2 siRNA synergy cancer therapy.

Endo/lysosomal escape and the subsequent controllable/precise release of drugs and genes are key challenges for efficient synergistic cancer therapy. Herein, we report a photoactivated polyprodrug nanoparticle system (PPNPsiRNA) centered on effective light-controlled codelivery of Pt(IV) prodrug and siRNA for synergistic cancer therapy. Under green-light irradiation, PPNPsiRNA can sustainedly generate oxygen-independent azidyl radicals to facilitate endo/lysosomal escape through the photochem. internalization (PCI) mechanism. Besides, concurrent Pt(II) release and siRNA unpacking could occur in a controllable manner after the decomposition of Pt(IV), main chain shattering of photoactivated polyprodrug and the PPNPsiRNA disassocn. Based on these innovative features, excellent synergistic therapeutic efficacy of chemo- and RNAi therapies of PPNPsiBcl-2 could be achieved on ovarian cancer cells under light irradiation The facile synthesized and prepared photoactivatable polyprodrug nanoparticle system provides a new strategy for effective gene/drug codelivery, where controllable endo/lysosomal escape and the subsequent drug/gene release/unpacking play vital roles, which could be adopted as a versatile codelivery nanoplatform for the treatment of various cancers.

Journal of Materials Chemistry B: Materials for Biology and Medicinepublished new progress about Antitumor agents. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, COA of Formula: C8H4O6.

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

Silva, Wesley R.; Matsubara, Elaine Y.; Rosolen, Jose M.; Donate, Paulo M.; Gunnella, Roberto published the artcile< Pd catalysts supported on different hydrophilic or hydrophobic carbonaceous substrate for furfural and 5-(hydroxymethyl)furfural hydrogenation in water>, Reference of 97-99-4, the main research area is palladium catalyst carbonaceous substrate furfural hydroxymethylfurfural hydrogenation water.

We hydrogenated furfural and 5-(hydroxymethyl)furfural (HMF) in water in a reaction catalyzed by Pd nanoparticles on carbonaceous materials with different morphol. and hydrophobic degree. The different Pd catalysts were prepared by dipping the carbonaceous material into a Pd0 micro-emulsion. The catalyst support affected the catalytic hydrogenation of furfural and HMF. By using micrometric active carbon (AC) combined with cup-stacked carbon nanotubes (CSCNTs) and Pd0/2+ nanoparticles (Pd), we obtained a micro/nanostructured material designated Pd/CSCNT-AC, which performed better than the other carbonaceous materials containing similar Pd nanoparticle loading. Pd/CSCNT-AC produced tetrahydrofurfuryl alc. from furfural with excellent selectivity (>99%). Unlike Pd on hybrophobic spheroid graphite or hydrophilic AC, Pd/CSCNT-AC hydrogenated both the C=O and C=C double bonds of furfural and catalyzed HMF hydrogenation at the C=O double bond more selectively: between 85% and 99% selectivity toward 2,5-dihydroxymethylfuran. We also investigated how temperature, hydrogen pressure, and reaction time affected HMF hydrogenation in water. Finally, Pd/CSCNT-AC was recycled several times without significant catalytic activity loss.

Molecular Catalysispublished new progress about Carbon nanotubes. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Reference of 97-99-4.

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