Tag: 200-300

Smotrina, T. V.;Smotrin, V. A.;Stoyanov, O. V. published 《Molecular mobility and proton magnetic relaxation processes in water-polymer system》 in 2014. The article was appeared in 《Vestnik Kazanskogo Tekhnologicheskogo Universiteta》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:

The processes of proton magnetic relaxation in hydrated polymers were studied. It is established that in the presence of water spin-lattice relaxation in rigid-chain polymers that do not contain moving side substituents (for example, aromatic polyamides), is carried out mainly through a phase of sorbed water mols. which act as addnl. relaxation. For hydrated polysaccharides containing movable oxymethylene group, and flexible-chain aliphatic polyamides (example capron) a significant contribution to the processes of spin-lattice relaxation make mol. motion activated their amorphous phase, which gave the opportunity for these polymers to register, resp., the – and the-relaxation transitions. 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. Safety of 3-(4-Aminophenoxy)anilineEthers 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

Hasegawa, Masatoshi;Hori, Atsushi;Hosaka, Chisato;Ishii, Junichi published 《Poly(ester imide)s with low coefficients of thermal expansion ( CTEs ) and low water absorption ( VI ): an attempt to reduce the modulus while maintaining low CTEs and other desired properties》 in . The article was appeared in 《Polymer International》. They have made some progress in their research.SDS of cas: 2657-87-6 The article mentions the following:

Here, a challenging target in the development of high-temperature dielec. substrates was established: to significantly reduce the modulus of dielec. substrates while maintaining their low coefficients of thermal expansion (CTEs) and other desired properties, to suppress the spring-back force, which is generated in folded flexible printed circuit boards. An ester-linked tetracarboxylic dianhydride with an asym. and longitudinally extended structure (TA-HPBAHQ) exhibited good polymerizability with various aromatic diamines and led to the formation of poly(ester imide) (PEsI) precursors with sufficiently high mol. weights The thermally imidized TA-HPBAHQ-based PEsI films obtained using rigid diamines exhibited a very high glass transition temperature (T_g), ultralow CTE, suppressed water uptake and an extremely low coefficient of humidity (hygroscopic) expansion. In particular, the combination of TA-HPBAHQ and m-tolidine significantly lowered the modulus and improved the film ductility while maintaining a low CTE close to that of copper foil with other desired properties. In addition, a TA-HPBAHQ analog, TA-HNAHQ, containing a 2,6-naphthalene unit, was used. TA-HNAHQ-based PEsIs exhibited a further decreased modulus and other excellent properties similar to those of the TA-HPBAHQ-based systems except for the appearance of a β-transition in certain cases, depending on the diamines used. Certain selected PEsIs exhibited an extremely low tan δ at 10 GHz and a relatively good or the highest rank of flame retardancy. Thus, certain PEsIs examined in this study are promising candidates as new dielec. substrates required to exhibit a low CTE, suppressed modulus and other target properties for use in next-generation flexible printed circuit boards. 2022 Society of Industrial Chem. 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. SDS of cas: 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

Seung Kwon, Young;Lee, Ji-Su;Hwang, Gyu-Hyun;Gyu Jeong, Young published 《Structural, Optical and Thermal Characterization of Wholly Aromatic Poly(ether amide)s Synthesized by Phosphorylation-Based Condensation Polymerization》 in 2020. The article was appeared in 《ChemistrySelect》. They have made some progress in their research.SDS of cas: 2657-87-6 The article mentions the following:

To attain high performance polyamides with good thermal properties and enhanced processability, in this study, a series of wholly aromatic poly(ether amides) (PEAs) with different meta- and para-phenylene linkage ratios was synthesized by phosphorylation-based polycondensation reaction of terephthalic acid (TPA) and/or isophthalic acid (IPA) with 3,4′-oxydianiline (ODA) in NMP/CaCl2 solvent system. The synthesized PEA homopolymers and copolymers exhibited good solubility in organic polar solvents, such as NMP, DMAc and DMSO. The intrinsic viscosity of the synthesized PEAs in NMP solvent was measured to be in the range of 0.48-0.97 dL/g. The ¹H NMR analyses confirmed that the output compositions of PEA copolymers were quite consistent with the feed compositions The photog. digital images and UV-visible spectra showed that solution-casted PEA films were optically light brown and transparent owing to their amorphous and nonlinear chain structures. The DSC data revealed that the glass transition temperatures of PEAs are in the range of 242-310°C, depending on the relative contents of meta- and para-phenylene linkages. All PEA films were characterized to be thermally stable up to ∼400°C and to have high char residues above 63% at 800°C in nitrogen atm. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.

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. SDS of cas: 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

Recommanded Product: 2,6-Dimethoxyanilino(oxo)acetic acidIn 2018, Mao, Runze;Frey, Adrian;Balon, Jonathan;Hu, Xile published 《Decarboxylative C(sp³)-N cross-coupling via synergetic photoredox and copper catalysis》. 《Nature Catalysis》published the findings. The article contains the following contents:

Here, a general strategy for amination of alkyl electrophiles by merging photoredox and copper catalysis was provided. Photoredox catalysis allowed the use of alkyl redox-active esters, recently established as a superior class of alkyl electrophiles, whereas copper catalysis enabled C(sp³)-N cross-coupling. Decarboxylative amination could be used for the synthesis of a diverse set of alkyl anilines R¹NHR² [R¹ = Ph, 2-MeOC₆H₄, 2-pyridyl, etc; R² = CH(Me)₂, n-hexyl, cyclohexyl, etc.], with high chemoselectivity and functional-group compatibility. Rapid functionalization of amino acids, natural products and drugs was demonstrated.2,6-Dimethoxyanilino(oxo)acetic acid (cas: 2097273-59-9) were involved in the experimental procedure.

2,6-Dimethoxyanilino(oxo)acetic acid is one of ethers-buliding-blocks. At room temperature, ethers are pleasant-smelling colourless liquids. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. Recommanded Product: 2,6-Dimethoxyanilino(oxo)acetic acid They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons.

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

Related Products of 2657-87-6《Efficient aramid fiber monomerization using alkaline subcritical water》 was published in 2021. The authors were Okajima, Idzumi;Okamoto, Hayato;Sako, Takeshi, and the article was included in《Polymer Degradation and Stability》. The author mentioned the following in the article:

To establish the chem. recycling of copoly(p-phenylene-3,4′-oxydiphenylene terephthalamide) fibers (i.e., Technora), their hydrolysis in pure supercritical, pure subcritical, and alk. subcritical water was investigated, and an efficient purification method to recover the constituent monomers in high yields and > 99% purity was developed. Technora hydrolysis in pure supercritical water required high temperatures, thus leading to monomer degradation and hence low monomer yields. Similarly, Technora hydrolysis to monomers was incomplete in pure subcritical water, which also resulted in low monomer yields. In contrast, the addition of NaOH to subcritical water promoted fiber decomposition, rendered hydrolysis irreversible, and prevented degradation of the produced monomers by allowing the reaction to proceed at lower temperature Thus, when subcritical water containing 10 equiv of NaOH per Technora unit was used at 250°C and 4 MPa for 3 h, the fibers decomposed with 100% efficiency, and the monomers were recovered in 88-99% yields. The rate of Technora hydrolysis in a neutral medium of either pure supercritical or subcritical water was represented well using the cylindrical-surface reaction model. This model was adjusted to describe the reaction in an alk. medium, i.e., subcritical water containing NaOH, by considering the decrease in both NaOH concentration and Technora surface area.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

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. Related Products 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

Tsai, Mei-Hui;Tseng, I-Hsiang;Liao, Yu-Fu;Chiang, Jen-Chi published 《Transparent polyimide nanocomposites with improved moisture barrier using graphene》 in 2013. The article was appeared in 《Polymer International》. They have made some progress in their research.Recommanded Product: 2657-87-6 The article mentions the following:

A facile technique was developed to improve the water barrier properties of transparent polyimide (PI) films. Transparent and organo-soluble PI films were synthesized from an alicyclic tetracarboxylic dianhydride (bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride) and an aromatic diamine (3,4′-oxydianiline) in a co-solvent of dimethylacetamide (DMAc) and γ-butyrolactone via a one-step process. Thermally reduced graphene (RG) was then blended with the PI in DMAc solution to fabricate PI/RG nanocomposite films without the addition of coupling agent. With the incorporation of only 0.1 wt% highly exfoliated RG in the PI matrix, the resultant PI/RG-0.1 nanocomposite exhibited a superior barrier to moisture and retained high transmittance in the visible light region. The surface of PI/RG was more hydrophobic than that of pure PI and simultaneously the water vapor transmission rate was significantly reduced to 13 g m-2 day-1 for the PI/RG-0.1 nanocomposite compared to 181 g m-2 day-1 for pure PI. Notably, the PI/RG-0.1 nanocomposite also exhibited favorable thermal stability with a lower coefficient of thermal expansion and a higher thermal degradation temperature compared to pure PI. The easy processing of PI solution and RG nanosheets, the good orientation of RG in PI and the excellent barrier and thermal properties of PI/RG make the transparent PI nanocomposite films potential substrate materials in flexible electronic applications. 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 lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Recommanded Product: 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

Garcia, Mariano;del Campo, Carmen;Llama, Emilio F.;Sinisterra, Jose V. published 《Synthesis of α,α-disubstituted acetic acids using low-valent titanium》 in 1995. The article was appeared in 《Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry》. They have made some progress in their research.Synthetic Route of C15H16O2 The article mentions the following:

Dihalocarbenes generated using low-valent titanium (LVT) undergo a one-pot cycloaddition to diaryl, aryl alkyl or dialkyl ketones to give α,α-disubstituted acetic acids such as (R,S)-2-arylpropanoic acids. TiI₄ proved most effective in this reaction for which the product yield was optimized by use of an excess of reducing agent. The experimental procedure involved many compounds, such as 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

Recommanded Product: 2657-87-6In 2016, Meng, Xiangsheng;Zheng, Yan;Yan, Jingling;Li, Yunhui;Wang, Zhen;Li, Guodong published 《2,3,3′,4′-Oxydiphthalic dianhydride-based phenylethynyl-terminated imide oligomers for low-temperature resin transfer molding applications》. 《High Performance Polymers》published the findings. The article contains the following contents:

A series of imide resins were prepared using 2,3,3′,4′-oxydiphthalic dianhydride, 4-phenylethynylphthalic anhydride, and aromatic diamines (1,3-bis(3-aminophenoxy), 3,4′-oxyaniline, 2,2′-bis(trifluoromethyl)benzidine, and m-phenylenediamine) as starting materials. These imide oligomers were characterized by means of Fourier transform IR spectroscopy, differential scanning calorimetry, intrinsic viscosity measurements, and rheol. measurements. Some of these oligomers exhibited low (<1 Pa.s at 250°C) and stable (>2 h at 250°C) melt viscosity, which was highly desirable for resin transfer molding process. Thermosetting polyimides (PIs) were then produced from these oligomers via thermal crosslinking reaction of phenylethynyl group. The properties of the thermosets were studied using tensile and flexural testing, dynamic mech. thermal anal., and thermogravimetric anal. The cured PIs exhibited a good combination of thermal and mech. properties, with a tensile strength of 31-76 MPa, flexural strength of 38-142 MPa, glass transition temperatures of 233-358°C, and 5% weight loss temperatures of 540-545°C under nitrogen atm. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.

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

Konishi, Akihito;Okada, Yui;Nakano, Motohiro;Sugisaki, Kenji;Sato, Kazunobu;Takui, Takeji;Yasuda, Makoto published 《Synthesis and Characterization of Dibenzo[a,f]pentalene: Harmonization of the Antiaromatic and Singlet Biradical Character》. The research results were published in《Journal of the American Chemical Society》 in 2017.SDS of cas: 2235-01-0 The article conveys some information:

Mesityl derivatives of the unknown dibenzopentalene isomer dibenzo[a,f]pentalene were synthesized. The mol. geometry and phys. properties of dibenzo[a,f]pentalene were investigated. Dibenzo[a,f]pentalene combines a large antiarom. and appreciable singlet open-shell character, properties not shared by well-known isomer dibenzo[a,e]pentalene. 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. SDS of cas: 2235-01-0 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

COA of Formula: C15H16O2《A ketal-tethered RCM strategy toward the synthesis of spiroketal related natural products》 was published in 2006. The authors were Ghosh, Sunil K.;Ko, Changhong;Liu, Jia;Wang, Jiashi;Hsung, Richard P., and the article was included in《Tetrahedron》. The author mentioned the following in the article:

An unconventional approach to construct spiroketals and spiroaminals via ring-closing metathesis [RCM] of cyclic ketals and aminals, resp., was described here. This method possesses a good generality with no loss of stereochem. integrity at the spirocenter under the standard RCM conditions. This approach was applied to the synthesis of an insect pheromone I to demonstrate its synthetic potential, and also to the synthesis of the protected C11-epi-C22-C23 fragment II (R = CH₂C₆H₄-4-OMe, R¹ = SiPh₂CMe₃) of spirastrellolide A. Both are proof-of-concept applications to feature a ketal-tethered RCM as an alternative strategy for construction of spiroketals. And Dimethoxydiphenylmethane (cas: 2235-01-0) was used in the research process.

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. COA of Formula: 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