Category: ethers-buliding-blocks

Spencer, Ryan K. published the artcileX-ray Crystallographic Structures of Trimers and Higher-Order Oligomeric Assemblies of a Peptide Derived from Aβ_17-36, Safety of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is Journal of the American Chemical Society (2014), 136(15), 5595-5598, database is CAplus and MEDLINE.

A peptide derived from Aβ_17-36 crystallizes to form trimers that further associate to form higher-order oligomers. The trimers consist of three highly twisted β-hairpins in a triangular arrangement. Two trimers associate face-to-face in the crystal lattice to form a hexamer; four trimers in a tetrahedral arrangement about a central cavity form a dodecamer. These structures provide a working model for the structures of oligomers associated with neurodegeneration in Alzheimer’s disease.

Journal of the American Chemical Society published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C8H7ClO3, Safety of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zhang, Chaofeng published the artcilePromoting Lignin Depolymerization and Restraining the Condensation via an Oxidation-Hydrogenation Strategy, HPLC of Formula: 183303-74-4, the publication is ACS Catalysis (2017), 7(5), 3419-3429, database is CAplus.

For lignin valorization, simultaneously achieving the efficient cleavage of ether bonds and restraining the condensation of the formed fragments represents a challenge thus far. Herein, we report a two-step oxidation-hydrogenation strategy to achieve this goal. In the oxidation step, the O₂/NaNO₂/DDQ/NHPI system selectively oxidizes C_αH-OH to C_α=O within the β-O-4 structure. In the subsequent hydrogenation step, the α-O-4 and the preoxidized β-O-4 structures are further hydrogenated over a NiMo sulfide catalyst, leading to the cleavage of C_β-OPh and C_α-OPh bonds. Besides the transformation of lignin model compounds, the yield of phenolic monomers from birch wood is up to 32% by using this two-step strategy. The preoxidation of C_αH-OH to C_α=O not only weakens the C_β-OPh ether bond but also avoids the condensation reactions caused by the presence of C_α⁺ from dehydroxylation of C_αH-OH. Furthermore, the NiMo sulfide prefers to catalyze the hydrogenative cleavage of the C_β-OPh bond connecting with a C_α=O rather than catalyze the hydrogenation of C_α=O back to the original C_αH-OH, which further ensures and utilizes the advantages of preoxidation

ACS Catalysis published new progress about 183303-74-4. 183303-74-4 belongs to ethers-buliding-blocks, auxiliary class Benzene,Alcohol,Ether, name is 1-(3,4-Dimethoxyphenyl)-2-phenoxyethanol, and the molecular formula is C10H9NO, HPLC of Formula: 183303-74-4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Li published the artcileDetermination of content of compound pramoxine hydrochloride cream by HPLC, SDS of cas: 637-58-1, the publication is Xibei Daxue Xuebao, Ziran Kexueban (2007), 37(1), 52-54, database is CAplus.

The paper established an HPLC method for the determination of content of compound pramoxine hydrochloride cream. A CLC-ODS C₁₈ column (150 mm × 4.6 mm, 5 μm) and acetonitrile-phosphate buffer solution (55:45) as the mobile phase (adjusted to pH 7.5) were used for the determination with the detection wavelength of 224 nm and the column temperature of 40°. The flow rate was 1.0 mL/min. Results showed that a linear relationship was obtained within the range of 0.2120-0.9035 mg/mL (r = 0.9999). The average recovery was 99.63% (RSD = 0.53%). In conclusion, the method was simple, sensitive, accurate and suitable for the quant. control of compound pramoxine hydrochloride cream.

Xibei Daxue Xuebao, Ziran Kexueban published new progress about 637-58-1. 637-58-1 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is 4-(3-(4-Butoxyphenoxy)propyl)morpholine hydrochloride, and the molecular formula is C18H26ClN3O, SDS of cas: 637-58-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Yixuan published the artcileWidely targeted metabolomics analysis of enriched secondary metabolites and determination of their corresponding antioxidant activities in Elaeagnus angustifolia var. orientalis (L.)Kuntze fruit juice enhanced by Bifidobacterium animalis subsp. Lactis HN-3 fermentation, Recommanded Product: 1,2-Dimethoxybenzene, the publication is Food Chemistry (2022), 131568, database is CAplus and MEDLINE.

Elaeagnus angustifolia var. orientalis (L.)Kuntze fruit contains a large number of naturally occurring mols. present as glycoside, methylated, and Me ester conjugates, which should be hydolyzed or transformed to become bioactive forms. For this purpose, Bifidobacterium animalis subsp. lactis HN-3 was selected to ferment Elaeagnus angustifolia var. orientalis (L.)Kuntze fruit juice (EOJ). After fermentation, the total phenolic content (TPC) and antioxidant capacity of the EOJ increased significantly compared to the non-fermented EOJ. Using widely-targeted metabolomics anal., polyphenolic compounds involved in the flavonoid biosynthetic pathway were determined to be up-regulated in the fermented EOJ. In addition, the metabolites generated by 8 deglycosidation, 5 demethylation, 5 hydrogenation, and 28 other reactions were detected in higher concentrations in the fermented EOJ compared to the non-fermented EOJ. Interestingly, these up-regulated metabolites have higher antioxidant and other biol. activities than their metabolic precursors, which provide a theor. basis for the development of Bifidobacterium-fermented plant products with stronger functional activities.

Food Chemistry published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C9H9F5Si, Recommanded Product: 1,2-Dimethoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cai, Cheng published the artcileComparison of Two Acid Hydrotropes for Sustainable Fractionation of Birch Wood, Recommanded Product: 2-Methoxypropan-1-ol, the publication is ChemSusChem (2020), 13(17), 4649-4659, database is CAplus and MEDLINE.

This study reports on a comparative study of acid hydrotropic fractionation (AHF) of birch wood using maleic acid (MA) and p-toluenesulfonic acid (p-TsOH). Under the same level of delignification, lignin dissolved by MA is much less condensed with a higher content of ether aryl β-O-4 linkages. Lignin depolymerization dominated in MA hydrotropic fractionation (MAHF) and resulted in a single lower mol. weight peak, in contrast to the competitive depolymerization and repolymn. in p-TsOH AHF with a bimodal distribution. The less condensed MA-dissolved lignin facilitated catalytic conversion to monophenols. Carboxylation of residual lignin in fractionated cellulosic water-insoluble solids (WISs) enhanced enzymic saccharification by decreasing nonproductive cellulase binding to lignin. At a low cellulase loading of 10 FPU g^-1 glucan, saccharification of WIS-M_T120 from MAHF at 120°C was 95% compared with 48% for WIS-P_T85 from p-TsOH AHF at 85°C under the same level of delignification of 63%. Residual lignin carboxylation also facilitated nanofibrillation of WIS for producing lignin-containing cellulose nanofibrils (LCNFs) through an enhanced lignin lubrication effect, which substantially decreases fibrillation energy. LCNFs from only one pass of microfluidization of WIS-M_T120 have the same morphol. as those from WIS-P_T85 after three passes. MA also has a lower solubility and higher minimal hydrotropic concentration, which facilitated acid recovery. MA is U. S. Food and Drug Administration (FDA)-approved as an indirect food additive, affording significant advantages compared with p-TsOH for biorefinery applications.

ChemSusChem published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C4H10O2, Recommanded Product: 2-Methoxypropan-1-ol.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zhang, Wenyu published the artcileFT-IR study of propylene oxide adsorption on metal oxides, Application of 2-Methoxypropan-1-ol, the publication is Advanced Materials Research (Durnten-Zurich, Switzerland) (2013), 169-173, 6 pp., database is CAplus.

The adsorption of propylene oxide (PO) onto MgO, ZnO and Al₂O₃ was investigated by using in situ-IR measurements. Detailed mechanisms for PO adsorption onto these metal oxides are proposed. It was found that the PO epoxide ring exhibits two opening tendencies, depending on the acid-base properties of the metal oxide. PO adsorbed onto MgO is preferentially opened at the O-C(1) bond. The epoxide ring provides two ways to open, at the O-C(1) or the O-C(2) bond on Al₂O₃. PO adsorbed onto ZnO showed no chem. adsorption on its surface.

Advanced Materials Research (Durnten-Zurich, Switzerland) published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C15H24S, Application of 2-Methoxypropan-1-ol.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Chao published the artcileSalting-out re-distillation combined with sensory-directed analysis to recover odor-active compounds for improving the flavor quality of instant Pu-erh tea, Safety of 1,2-Dimethoxybenzene, the publication is Food Chemistry: X (2022), 100310, database is CAplus and MEDLINE.

The objective of this study was to develop an effective recovery technol. of odor-active compounds (OACs) to improve the flavor quality of instant Pu-erh tea (IPT) based on their released behaviors. Salting-out re-distillation (SRD) combined with sensory-directed anal. was developed. The contributing factors, including the soaking time of tea, recovery volume of condensed water of first distillation, amount of sodium chloride, recovery volume of condensed water of SRD, and re-use times of sodium chloride, were studied systematically. Under optimized conditions, 41 OACs were recovered in the first distillation, and the total recovery rate was 83.94%. Forty-one OACs were recovered via SRD, and the total recovery rate reached 72.29%, significantly better than membrane method (33.46%). The IPT prepared by adding OACs that recovered via SRD showed strong aroma attributes intensities and good coordination. This developed method can provide a more effective scheme to improve the flavor quality of IPT.

Food Chemistry: X published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C13H16O2, Safety of 1,2-Dimethoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Chao published the artcileEffects of electrostatic spray drying on sensory qualities, aroma profile and microstructural features of instant Pu-erh tea, Category: ethers-buliding-blocks, the publication is Food Chemistry (2022), 373(Part_B), 131546, database is CAplus and MEDLINE.

The sensory qualities, aroma profile, and microstructural features of instant Pu-erh teas (IPTs) produced by electrostatic spray drying (ESD) were evaluated by sensory and instrumental analyses and compared with those produced by other drying methods (freeze-drying [FD], vacuum drying [VD], and conventional spray drying [CSD]). The sensory qualities of ESDIPT were similar to those of FDIPT, and better than those of VDIPT and CSDIPT. Eighty-eight volatiles were detected in all IPTs, and 45 odor-active compounds were captured. Most of their OAVs were higher in ESDIPT than in VDIPT and CSDIPT but were lower than those in FDIPT. Dihydro-β-ionone had the highest OAV. Aroma recombination experiments were performed to verify the identification results. ESDIPT was present in the shape of microspheres with many regular concave surfaces, which was different from those treated by other drying methods. In terms of sensory quality and productivity, ESD would be a potential method for IPT production

Food Chemistry published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C20H17FO4S, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Ku, Conghao published the artcileOne-step construction of mesoporous cyano and sulfur co-modified carbon nitride for photocatalytic valorization of lignin to functionalized aromatics, COA of Formula: C9H10O4, the publication is Applied Surface Science (2022), 153266, database is CAplus.

Herein, mesoporous cyano and sulfur co-modified carbon nitride (MCSCN) is one-step constructed for the first time by a simple strategy using urea and trithiocyanuric acid as precursors. Trithiocyanuric acid can act as pore-fabricating units to form mesopores, meanwhile introduce cyano groups and sulfur atoms into carbon nitride. The constructed mesoporous structures effectively reduce the mass transfer resistance of macromol. lignin in the photocatalytic reaction process. The synergistic effect of the modified cyano groups and sulfur atoms significantly improves the photocatalytic valorization effect of waste lignin to functionalized aromatics As a representative of waste lignin, waste Camellia oleifera shell (WCOS) lignin can be efficently photocatalytic transformed to monophenolic compounds by MCSCN, and each gram of WCOS lignin can harvest 116.2 mg of functionalized aromatics, which is about 7 times higher than that by traditional g-C₃N₄ photocatalyst (16.7 mg/g).

Applied Surface Science published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C9H10O4, COA of Formula: C9H10O4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Mo, Yi published the artcileStudy on highly/accurate quantum chemical calculations carried for a local region of a system, Computed Properties of 16332-06-2, the publication is Wuli Huaxue Xuebao (2002), 18(8), 716-720, database is CAplus.

The method proposed by us to carry out high accurate d. functional calculations in a local region of a large system was applied to the calculation of a series of different type of mols. and the data such as Mulliken charges, bond lengths, bond dissociation energies, the first ionization potentials and electronegativities were obtained. High accuracy calculations for the same set of mols. and the correspondent model mols. with a hydrogen atom replacing the part of a mol. surrounding the local region were also carried out with the conventional method for comparison. It is found that the results obtained by the local high accuracy calculation are in good agreement with those obtained by the conventional high accuracy calculation while the calculated results for the model mols. show larger deviation. The results presented in this paper show further that the local high accuracy calculation method proposed by us is practical and valuable.

Wuli Huaxue Xuebao published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Computed Properties of 16332-06-2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem