Category: ethers-buliding-blocks

Ren, Miao-miao published the artcileSupercritical extraction and characterization of corn stover lignin, COA of Formula: C4H10O2, the publication is Huaxue Gongye Yu Gongcheng (Tianjin, China) (2012), 29(5), 52-57, database is CAplus.

ScCO₂/ethanol-water was used to extract lignin from corn stover. Lignin product was obtained from the extraction by precipitation The composition of the extract and the structure of the extracted lignin product were analyzed using GC-MS, FTIR and UV. Thermogravimetric anal. was conducted to study the thermal stability of extracted lignin. The results showed that the extracted lignin appeared to show the typical lignin structures and to decompose mostly between 180°C and 500°C. The three dimension supramol. structure of lignin was greatly broken down, primarily through the cleavage of ether linkages. The internal bonds of lignin-hemicellulose were not hydrolyzed completely, which leading to the extracted lignin containing a certain amount of carbohydrate.

Huaxue Gongye Yu Gongcheng (Tianjin, China) 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, COA of Formula: C4H10O2.

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

Xiao, Juan-Ding published the artcileRelation Between Coordination and Lewis-Acid Property of MOF-Derived Mononuclear Zn(II) Catalyst Toward Epoxide Hydroxylation, Name: 2-Methoxypropan-1-ol, the publication is ChemCatChem (2021), 13(24), 5236-5242, database is CAplus.

Lewis-acid properties of the coordinatively unsaturated metal ions are highly relevant to the coordination environment; however, it remains a challenge to establish the coordination structure-activity relationship, especially in heterogeneous catalysis. Here, a typical metal-organic framework, ZIF-8, is selected as the precursor to prepare Lewis-acid based Zn-N/P-C mononuclear catalysts, with well-designed external structures but difference in the local coordination. The obtained mononuclear Zn(II) catalysts can not only inherit the advantages of MOF in coordination, but also simulate the homogeneous environment during the catalysis owing to the monodispersed metal sites in ZIF-8. Eventually, relation between coordination and Lewis-acid property toward epoxide hydroxylation has been illustrated. Results show the substituted coordination atom of P and the decrease of coordination number strongly enhance the Lewis-acidity of Zn²⁺, causing the TOF values changes from 8.7 to 80.1 h^-1 based on Zn content. The work affords an understanding and inspiration of coordination environment matters toward Lewis-acid catalysis in organic transformations.

ChemCatChem 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 C13H19Br2ClN2O, Name: 2-Methoxypropan-1-ol.

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

Liu, Bingxin published the artcileWhite light emission transparent polymer nanocomposites with novel poly(p-phenylene vinylene) derivatives and surface functionalized CdSe/ZnS NCs, Formula: C15H24O2, the publication is Dyes and Pigments (2013), 99(1), 192-200, database is CAplus.

A series of new polymers with conjugated poly(p-phenylene vinylene) units and non-conjugated poly(p-xylylene) units containing vinyl and carboxyl groups were synthesized. The monodisperse CdSe/ZnS nanocrystals with a red light emission were prepared by using the phosphine-free precursors. A novel fluorescent polymer and 5-(2-methacryloylethyloxymethyl)-8-quinolinol were dispersed in vinyl monomers containing CdSe/ZnS NCs to successfully fabricate transparent bulk nanocomposites by in situ polymerization The 5-(2-methacryloylethyloxymethyl)-8-quinolinol mols. can be coordinated to the surface of CdSe/ZnS nanocrystals to form a metalloquinolate with green light emission at about 500 nm, while the red light emission of nanocrystals remained after the polymerization process. The efficient white light emitting polymer nanocomposites with color coordinates (0.32, 0.34) can be obtained when the weight ratio of nanocrystals to 5-(2-methacryloylethyloxymethyl)-8-quinolinol is 10:1. A charge transfer from the photoexcited metalloquinolates to the nanocrystals was observed in the system.

Dyes and Pigments published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Formula: C15H24O2.

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

Lei, Zepeng published the artcileHighly stable dioxin-linked metallophthalocyanine covalent organic frameworks, Computed Properties of 91-16-7, the publication is Chinese Chemical Letters (2021), 32(12), 3799-3802, database is CAplus.

We report a series of highly stable metallophthalocyanine-based covalent organic frameworks (MPc-dx-COFs) linked by robust 1,4-dioxin bonds constructed through nucleophilic aromatic substitution (S_NAr) reaction. The chem. structures and crystallinity of the COFs largely remain unchanged even after treating with boiling water (90 °C), concentrated acids (12 mol/L HCl) or bases (12 mol/L NaOH), oxidizing (30% H₂O₂) or reducing agents (1 mol/L NaBH₄) for three days due to their stable M-Pc building blocks and resilient dioxin linkers. With metalated phthalocyanine active sites regularly arranged in the stable framework structures, MPc-dx-COFs can be directly used as efficient electrocatalysts for the oxygen reduction reaction (ORR) without pyrolysis treatment that has commonly been used in previous studies.

Chinese Chemical Letters 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 C8H10O2, Computed Properties of 91-16-7.

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

D’Orsi, Rosarita published the artcileKumagawa and Soxhlet Solvent Fractionation of Lignin: The Impact on the Chemical Structure, Quality Control of 91-16-7, the publication is ACS Omega (2022), 7(29), 25253-25264, database is CAplus and MEDLINE.

We investigated the effects of solvent fractionation on the chem. structures of two com. tech. lignins. We compared the effect of Soxhlet and Kumagawa extraction The aim of this work was to compare the impact of the methods and of the solvents on lignin characteristics. Our investigation confirmed the potentialities of fractionation techniques in refining lignin properties and narrowing the mol. weight distribution. Furthermore, our study revealed that the Kumagawa process enhances the capacity of oxygenated solvents (ethanol and THF) to extract lignin that contains oxidized groups and is characterized by higher average mol. weights Furthermore, the use of THF after ethanol treatment enabled the isolation of lignin with a higher ratio between carbonyl and other oxidized groups. This result was confirmed by attenuated total reflectance-Fourier transform IR spectroscopy (ATR-FTIR), ¹³C NMR and two-dimensional (2D) NMR spectroscopies, gel permeation chromatog. (GPC), and anal. pyrolysis-gas chromatog.-mass spectrometry (GC-MS) anal. UV-visible (UV-vis) spectra evidenced the enrichment in the most conjugated species observed in the extracted fractions. Elemental analyses pointed at the cleavage of C-heteroatom bonds enhanced by the Kumagawa extraction

ACS Omega 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 C8H10O2, Quality Control of 91-16-7.

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

Huang, Chenghong published the artcileSilver-Mediated Trifluoromethoxylation of Aryl Stannanes and Arylboronic Acids, Recommanded Product: (3-(Methoxycarbonyl)-5-methylphenyl)boronic acid, the publication is Journal of the American Chemical Society (2011), 133(34), 13308-13310, database is CAplus and MEDLINE.

A silver-mediated cross-coupling of trifluoromethoxide with aryl stannanes and arylboronic acids to give aryl trifluoromethyl ethers, e.g., I, is reported. This is the first report of a transition-metal-mediated C_aryl-OCF₃ bond formation.

Journal of the American Chemical Society published new progress about 929626-18-6. 929626-18-6 belongs to ethers-buliding-blocks, auxiliary class Boronic acid and ester,Benzene,Ester,Boronic Acids,Boronic Acids,Boronic acid and ester, name is (3-(Methoxycarbonyl)-5-methylphenyl)boronic acid, and the molecular formula is C9H11BO4, Recommanded Product: (3-(Methoxycarbonyl)-5-methylphenyl)boronic acid.

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

Liu, Chuanzhi published the artcileDiscovery and Mechanistic Studies of a General Air-Promoted Metal-Catalyzed Aerobic N-Alkylation Reaction of Amides and Amines with Alcohols, Product Details of C13H14N2O, the publication is Journal of Organic Chemistry (2011), 76(14), 5759-5773, database is CAplus and MEDLINE.

The thermodynamically unfavorable anaerobic dehydrogenative alc. activation to aldehydes and hydridometal species is the bottleneck in metal-catalyzed N-alkylations due to a general and unnoticed catalyst deactivation by amines/amides. Thus, different from the anaerobic dehydrogenation process in borrowing hydrogen or hydrogen autotransfer reactions that require noble metal complexes or addition of capricious ligands for catalyst activation, the water-producing, exothermic, metal-catalyzed aerobic alc. oxidation is thermodynamically more favorable and the most effective and advantageous aldehyde generation protocol. This leads to a general and advantageous air-promoted metal-catalyzed aerobic N-alkylation methodol. that effectively uses many simpler, less expensive, more available, and ligand-free metal catalysts that were inactive under typical anaerobic borrowing hydrogen conditions, avoiding the use of preformed metal complexes and activating ligands and the exclusive requirement of inert atm. protection. This aerobic method is quite general in substrate scope and tolerates various amides, amines, and alcs., revealing its potentially broad utilities and interests in academy and industry. In contrast to the commonly accepted borrowing hydrogen mechanism, based on a thorough mechanistic study and supported by the related literature background, a new mechanism analogous to the relay race game that has never been proposed in metal-catalyzed N-alkylation reactions is presented.

Journal of Organic Chemistry published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Product Details of C13H14N2O.

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

Amandi, Rodrigo published the artcileFriedel-Crafts Alkylation of Anisole in Supercritical Carbon Dioxide: A Comparative Study of Catalysts, Recommanded Product: 2-Isopropylanisole, the publication is Organic Process Research & Development (2005), 9(4), 451-456, database is CAplus.

The Friedel-Crafts alkylation of anisole with n-propanol was carried out over five different Bronsted solid acid catalysts using supercritical carbon dioxide as the reaction medium. The reaction temperature and pressure were evaluated in terms of selectivity for the monoalkylated products, conversion of the starting material, and the products’ isomeric ratio. Desulfonation of the catalysts was observed when the temperature was increased above 150 °C for the organic supported catalysts investigated Amberlyst 15 and Purolite CT-175, and above 200 to 250 °C for the inorganic supported catalysts Nafion SAC-13 and Deloxan ASP I/7. A decrease in the catalytic performance of organic supported catalysts was observed with increasing pressure. This decrease was related to the phase behavior of the reaction.

Organic Process Research & Development published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, Recommanded Product: 2-Isopropylanisole.

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

Chang, Meng-Yang published the artcileGram-Scale Synthesis of Substituted Triarylmethanes, Quality Control of 91-16-7, the publication is Synthesis, database is CAplus.

A high-yield, open-vessel route for the facile-operational, gram-scale synthesis of functionalized triarylmethanes (TRAMs) was described via silica-coated magnetic nanoparticles of modified polyphosphoric acid (NiFe₂O₄@SiO₂-PPA)-mediated intermol. Friedel-Crafts reaction of substituted aryl aldehydes with 2 equiv of oxygenated arenes under environmentally friendly reaction conditions. Among the overall reaction process, only water was generated as the byproduct. Various reaction conditions were investigated for efficient transformation.

Synthesis 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 C8H10O2, Quality Control of 91-16-7.

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

Liu, Chao published the artcileLignin-first biorefinery of corn stalk via zirconium(IV) chloride/sodium hydroxide-catalyzed aerobic oxidation to produce phenolic carbonyls, Category: ethers-buliding-blocks, the publication is Bioresource Technology (2022), 127183, database is CAplus and MEDLINE.

Lignin-first biorefinery of corn stalk via ZrCl₄/NaOH-catalyzed aerobic oxidation for phenolic carbonyls production was reported. Under the co-catalysis of ZrCl₄ and NaOH, lignin in corn stalk was oxidized into phenolic aldehydes (p-hydroxybenzaldehyde, vanillin, and syringaldehyde), ketones (p-hydroxyacetophenone, acetovanillone, and acetosyringone), acids (p-hydroxybenzoic acid and vanillic acid), and other derivatives Reaction conditions, including time, temperature, ZrCl₄ dosage, NaOH dosage, MeCN/H₂O ratio, and initial O₂ pressure were comprehensively screened, and the optimal lignin-derived monomer yields of 13.2 weight% was obtained. Among these aromatic compounds, phenolic aldehydes were the main products, and the overall selectivity of phenolic carbonyls was as high as 93%. Cellulose-rich residues after lignin-first oxidation were further characterized by thermogravimetry and anal. pyrolysis with corn stalk as the control, proving the good fragmentation and dissolution of lignin streams. In general, ZrCl₄/NaOH-catalyzed lignin-first oxidation provided a novel approach for lignin valorization, and achieved the highest reported phenolic carbonyls selectivity.

Bioresource Technology 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, Category: ethers-buliding-blocks.

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