Category: ethers-buliding-blocks

Hsieh, Ching-Wen;Li, Bo-Xian;Suen, Shing-Yi published 《Alicyclic Polyimide/SiO2 Mixed Matrix Membranes for Water/n-Butanol Pervaporation》. The research results were published in《Membranes (Basel, Switzerland)》 in 2021.HPLC of Formula: 2657-87-6 The article conveys some information:

Alicyclic polyimides (PIs) have excellent properties in solubility, mech. strength, thermal property, etc. This study developed two types of alicyclic PI-based mixed matrix membranes (MMMs) for water/n-butanol pervaporation application, which have never been investigated previously. The fillers were hydrophilic SiO₂ nanoparticles. The synthesized PI was mixed with SiO₂ nanoparticles in DMAc to make the casting solution, and a liquid film was formed over PET substrate using doctor blade. A dense MMM was fabricated at 80°C and further treated via multi-stage curing (100-170°C). The prepared membranes were characterized by FTIR, TGA, FE-SEM, water contact angle, and solvent swelling. The trends of pure solvent swelling effects agree well with the water contact angle results. Moreover, the pervaporation efficiencies of alicyclic PI/SiO₂ MMMs for 85 wt% n-butanol aqueous solution at 40°C were investigated. The results showed that BCDA-3,4′-ODA/SiO2 MMMs had a larger permeation flux and higher separation factor than BCDA-1,3,3-APB/SiO2 MMMs. For both types of MMMs, the separation factor increased first and then decreased, with increasing SiO2 loading. Based on the PSI performance, the optimal SiO2 content was 0.5 wt% for BCDA-3,4′-ODA/SiO2 MMMs and 5 wt% for BCDA-1,3,3-APB/SiO2 MMMs. The overall separation efficiency of BCDA-3,4′-ODA-based membranes was 10-30-fold higher. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. HPLC of Formula: 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Chen, Yung-Chung;Hsiao, Sheng-Huei;Wu, Cheng-Hsin published 《Thermally stable and organosoluble poly(amide-imide)s based on the imide ring-preformed dicarboxylic acids derived from 3,4′-oxydianiline with trimellitic anhydride and 6FDA》 in 2017. The article was appeared in 《Journal of Macromolecular Science, Part A: Pure and Applied Chemistry》. They have made some progress in their research.Product Details of 2657-87-6 The article mentions the following:

A diimide-dicarboxylic acid (DIDA) was prepared from the condensation reaction of trimellitic anhydride (TMA) and 3,4′-oxydianiline (3,4′-ODA) in a 2:1 molar ratio, and another new tetraimide-dicarboxylic acid (TIDA) was synthesized by condensation from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), TMA, and 3,4′-ODA in a 1:2:2 molar ratio. Two series of aromatic poly(amide-imide)s (PAI) and were synthesized by Yamazaki phosphorylation polyamidation reactions of DIDA and TIDA, resp., with various aromatic diamines. Due to highly random segmental sequence for both series in the polymer chain and the incorporation of 6FDA moieties for the series, all the polymers were readily soluble in many organic solvents and could be casted into transparent, flexible, and tough films with good mech. properties. Glass-transition temperature (T_gs) of the series and series were recorded in the range of 242-274°C and 264-295°C. In addition, almost all the polymers showed 10% weight loss temperatures higher than 500°C under a nitrogen or an air atm. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Product Details of 2657-87-6Ethers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Synthetic Route of C15H16O2《Improved Benson Increments for the Estimation of Standard Enthalpies of Formation and Enthalpies of Vaporization of Alkyl Ethers, Acetals, Ketals, and Ortho Esters》 was published in 2002. The authors were Verevkin, Sergey P., and the article was included in《Journal of Chemical and Engineering Data》. The author mentioned the following in the article:

This work was undertaken for the evaluation and revision of group-additivity values necessary for predicting standard enthalpies of formation and enthalpies of vaporization of ethers, acetals, ketals, and ortho esters by means of Benson’s group-additivity methodol. The database on the standard molar enthalpies of vaporization ΔlgH_m⁰ has been extended with measurements on several acetals, ketals, and ortho esters using the transpiration method. The standard molar enthalpies of formation Δ_fH_m⁰ (g, 298.15K) of alkyl ethers, acetals, ketals, and ortho esters were derived using the data for the Δ_fH_m⁰(l or cr, 298.15K) from the literature and the present results for the enthalpies of vaporization or sublimation. The current database of exptl. data for enthalpies of formation and enthalpies of vaporization at 298.15 K have been used to reevaluate the values of the Benson’s increments for of alkyl ethers, acetals, ketals, and ortho esters. The group-additivity parameters and strain corrections useful in the application of the Benson’s correlation are presented in tabular form, together with a description of their evaluation. To complete the study, the researchers used Dimethoxydiphenylmethane (cas: 2235-01-0) .

The unique properties of ethers (i.e., that they are strongly polar, with nonbonding electron pairs but no hydroxyl group) enhance the formation and use of many reagents. For example, Grignard reagents cannot form unless an ether is present to share its lone pair of electrons with the magnesium atom.Synthetic Route of C15H16O2

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Thomas, Bejoy;Prathapan, Sreedharan;Sugunan, Sankaran published 《Synthesis of dimethyl acetal of ketones: design of solid acid catalysts for one-pot acetalization reaction》. The research results were published in《Microporous and Mesoporous Materials》 in 2005.Quality Control of Dimethoxydiphenylmethane The article conveys some information:

The synthesis of di-Me acetals of carbonyl compounds such as cyclohexanone, acetophenone, and benzophenone has successfully been carried out by the reaction between ketones and methanol using different solid acid catalysts. The strong influence of the textural properties of the catalysts such as acid amount and adsorption properties (surface area and pore volume) determine the catalytic activity. The mol. size of the reactants and products determine the acetalization ability of a particular ketone. The hydrophobicity of the various rare earth exchanged Mg-Y zeolites, K-10 montmorillonite clay, and cerium exchanged montmorillonite (which shows maximum activity) is more determinant than the number of active sites present on the catalyst. The optimum number of acidic sites as well as dehydrating ability of Ce³⁺-montmorillonite and K-10 montmorillonite clays and various rare earth exchanged Mg-Y zeolites seem to work well in shifting the equilibrium to the product side. To complete the study, the researchers used Dimethoxydiphenylmethane (cas: 2235-01-0) .

Dimethoxydiphenylmethane is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Quality Control of Dimethoxydiphenylmethane The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Formula: C12H12N2O《Synthesis of novel mono- and bis-Schiff bases of morpholine derivatives and the investigation of their antimalarial and antiproliferative activities》 was published in 2015. The authors were Jarrahpour, Aliasghar;Shirvani, Pouria;Sharghi, Hashem;Aberi, Mahdi;Sinou, Veronique;Latour, Christine;Brunel, Jean Michel, and the article was included in《Medicinal Chemistry Research》. The author mentioned the following in the article:

A series of new Schiff bases of morpholine were prepared by the reaction of 2-hydroxy-3-(morpholinomethyl)benzaldehyde with several mono- and bis-aromatic amines. All these new compounds were characterized by ¹H-NMR, ¹³C-NMR and IR spectroscopy. They were evaluated as antimalarial agents against P. falciparum K14 strain demonstrating moderate to excellent activities. The IC₅₀ of 6,6′-((1,2-Phenylenebis(azanylylidene))bis(methanylylidene))bis(2-(morpholinomethyl)phenol) was 2.28 μM. Moreover, derivatives present potent antiproliferative activities against U937 leukemia-derived cell line with EC₅₀ values varying from 3 to 8 μM. Finally, due to its quite low cytotoxicity up to 10 μM against normal fibroblast cells, derivative 6,6′-((1,2-Phenylenebis(azanylylidene))bis(methanylylidene))bis(2-(morpholinomethyl)phenol) appeared as a good compromising biol. active product. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Formula: C12H12N2O The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Choi, Young Chul;Kim, Min Su;Ryu, Kyoung Moon;Lee, Sang Hoon;Jeong, Young Gyu published 《Microstructures and electrothermal characterization of aromatic poly(azomethine ether)-derived carbon films》 in 2020. The article was appeared in 《Journal of Applied Polymer Science》. They have made some progress in their research.Application of 2657-87-6 The article mentions the following:

The authors report the microstructural evolution and electrothermal properties of aromatic poly(azomethine ether) (PAME)-derived C films, which were fabricated by a facile spin-coating and following carbonization at different temperatures of 300-1000°. For the purpose, poly[3-(4-nitrilophenoxy)phenylenenitrilomethine-1,3-phenylenemethine] (mPAME) with a high residue of ∼56.4% after carbonization at 1000° was synthesized for a polymeric precursor for C films. The XPS, Raman spectroscopy, and x-ray diffraction analyses revealed that the mol. structures of mPAME films changed into an intrinsically N-doped graphitic structure, dominantly at the carbonization temperatures of 800-1000°. The elec. conductivity increased considerably from ∼10^-7 S/cm, for mPAME-derived films fabricated at 300-700°, to ∼10⁰ S/cm for the film carbonized at 800° to ∼10¹ S/cm for the films carbonized at 900-1000°. Accordingly, mPAME-derived C films, which were carbonized at 900-1000°, exhibited excellent electrothermal performance, such as rapid temperature responsiveness, high maximum temperatures, and high elec. power efficiency to relatively low applied voltages of 5-13 V. The experimental procedure involved many compounds, such as 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Application of 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Recommanded Product: 2657-87-6《Novel polycondensation method of improving high-temperature properties of microheterogeneous rolivsan copolymers modified by inserting epoxy and imide bridges between spherical microdomains》 was published in 2017. The authors were Zaitsev, Boris A.;Shvabskaya, Irina D.;Kleptsova, Larisa G., and the article was included in《High Performance Polymers》. The author mentioned the following in the article:

Rolivsan thermosetting resins (ROLs) (low-viscosity solvent-free compositions including (di)vinylarom. ethers and thermosensitive (di)methacrylates) were modified by low amounts of polyfunctional compounds (epoxy resins (ERs) and aromatic diamines (DAs)). Thermochem. transformations in modified ROLs give novel glassy densely cross-linked copolymers with increased high-temperature strength and thermo-oxidative stability. It was revealed that copolymers obtained at different ROLs/ERs and ROLs/DA mixing ratios (which were varied over a wide range) and different heat treatment regimes have various compositions, cross-link densities, chem., topol., and morphol. structures. Structural features of these copolymers were studied by IR spectroscopy, dynamic mech., thermal, and elemental analyses; the temperature dependences of flexural strength were also obtained. Morphol. pattern of the cured ROLs is typical of microheterogeneous polymers where spherical highly cross-linked microdomains (polymer grains) with high T_g are weakly bound by less densely cross-linked defective (intergrain) polymer layers with lower T_g. On the basis of the data obtained in the studies of thermochem. transformations in ROLs/ERs and ROLs/DA blends, the new approach to improving thermal stability and heat resistance of thermosetting resins was developed. We suggest using intergrain layers in microheterogeneous cross-linked polymers as “microreactors” which include target polyfunctional compounds for various high-temperature polymerization and polycondensation reactions. To complete the study, the researchers used 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Recommanded Product: 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Aepkers, Marion;Wuensch, Bernhard published 《Synthesis and NMDA-receptor affinity of ring and side chain homologous dexoxadrol derivatives》. The research results were published in《Archiv der Pharmazie (Weinheim, Germany)》 in 2004.Computed Properties of C15H16O2 The article conveys some information:

The regioselectivity during transacetalization of benzophenone di-Me acetal with butane-1,2,4-triol is controlled by the reaction conditions. Thermodn. control leads predominantly to the 1,3-dioxolanes whereas kinetic control favors the six-membered acetals. The amines were investigated in receptor binding studies with radioligands for their affinity to the phencyclidine binding site of the NMDA-receptor. In both series the primary amines show the highest NMDA-receptor affinity (K_i = 3.38-1.45 μM). Surprisingly, the piperidine derivative (I) binds with high affinity at σ₁-receptors and, therefore, represents a novel lead compound for high affinity σ₁-receptor ligands. To complete the study, the researchers used Dimethoxydiphenylmethane (cas: 2235-01-0) .

Dimethoxydiphenylmethane is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Computed Properties of C15H16O2 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Ye, Baihua;Cramer, Nicolai published 《Chiral Cyclopentadienyl Ligands as Stereocontrolling Element in Asymmetric C-H Functionalization》. The research results were published in《Science (Washington, DC, United States)》 in 2012.Product Details of 2235-01-0 The article conveys some information:

Metal complexes coordinated by a single cyclopentadienyl (Cp) ligand are widely used, versatile catalysts, but their application to asym. reactions has been hindered by the difficulty of designing Cp substituents that effectively bias the coordination sphere. Here, we report on a class of simple C₂-sym. Cp derivatives that finely control the spatial arrangement of the transiently coordinated reactants around the central metal atom. Rhodium(III) complexes bearing these ligands proved to be highly enantioselective catalysts for directed carbon-hydrogen (C-H) bond functionalizations of hydroxamic acid derivatives To complete the study, the researchers used Dimethoxydiphenylmethane (cas: 2235-01-0) .

The unique properties of ethers (i.e., that they are strongly polar, with nonbonding electron pairs but no hydroxyl group) enhance the formation and use of many reagents. For example, Grignard reagents cannot form unless an ether is present to share its lone pair of electrons with the magnesium atom.Product Details of 2235-01-0

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem