Tag: 200-300

Liu, Limin;Li, Jianying;Yan, Tao;Cai, Mingzhong published 《Novel preparation of poly(arylene ether sulfone amide)s via supported palladium-catalyzed carbonylative polymerization》. The research results were published in《Polymer Bulletin (Heidelberg, Germany)》 in 2020.Reference of 3-(4-Aminophenoxy)aniline The article conveys some information:

Two new aromatic diiodides with ether-sulfone linkages were synthesized via a 1-step procedure. Poly(arylene ether sulfone amide)s were synthesized by a supported Pd-catalyzed polycondensation of aromatic diiodides having ether-sulfone linkages, aromatic diamines, and CO. Polycondensation reactions were conducted in N,N-dimethylacetamide using a magnetic nanoparticles-bound Pd(II) complex [Fe₃O₄@SiO₂-2P-PdCl₂] as the catalyst and 1,8-diazabicycle[5,4,0]-7-undecene as the base at 120°, yielding poly(arylene ether sulfone amide)s having inherent viscosities of 0.43-0.77 dL/g. The resulting polymers were soluble in polar aprotic solvents and showed glass transition temperatures in the 204-265° range, with 10% weight losses occurring at temperatures >456° in N. Most of the polymers afforded transparent and tough films by solution-casting with tensile strengths of 71.8-82.2 MPa, Young’s moduli of 1.77-2.35 GPa, and elongations at break of 9.3-13.4%. More importantly, this supported Pd catalyst can facilely be separated from the product by simply using an external magnetic field and reused at least 7 times with almost consistent activity.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. Reference 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

COA of Formula: C12H12N2OIn 2021, Hong, Weijie;Yuan, Lili;Ma, Yanping;Cui, Chao;Zhang, Haoyang;Yang, Shiyong;Sun, Wen-Hua published 《Resin transfer moldable fluorinated phenylethynyl-terminated imide oligomers with high Tg: structure-melt stability relationship》. 《Polymers (Basel, Switzerland)》published the findings. The article contains the following contents:

Phenylethynyl-terminated aromatic polyimides meet requirements of resin transfer molding (RTM) and exhibits high glass transition temperature (T_g) were prepared Moreover, the relationship between the polyimide backbones structure and their melting stability was investigated. The phenylethynyl-terminated polyimides were based on 4,4-(hexafluorosiopropylidene)-diphthalic anhydride (6FDA) and different diamines of 3,4-oxydianiline (3,4-ODA), m-phenylenediamine (m-PDA) and 2,2-bis(trifluoromethyl)benzidine (TFDB) were prepared These oligoimides exhibit excellent melting flowability with wide processing temperature window and low min. melt viscosities (<1 Pa·s). Two of the oligoimides display good melting stability at 280-290°C, which meet the requirements of resin transfer molding (RTM) process. After thermally cured, all resins show high glass transition temperatures (T_gs, 363-391°C) and good tensile strength (51-66 MPa). The cure kinetics studied by the differential scanning calorimetry (DSC), ¹³C NMR (¹³C NMR) characterization and d. functional theory (DFT) definitely confirmed that the electron-withdrawing ability of oligoimide backbone can tremendously affect the curing reactivity of terminated phenylethynyl groups. The replacement of 3,4-ODA units by m-PDA or TFDB units increase the electron-withdrawing ability of the backbone, which increase the curing rate of terminated phenylethynyl groups at processing temperatures, hence results in the worse melting stability. 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. COA of 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

Sugimoto, Yuka;Suzuki, Yasuhito;Matsumoto, Akikazu published 《Evaluation of heat resistance of metal-resin bonding using epoxy monoliths prepared with various epoxy resins and diamine curing agents》. The research results were published in《Nippon Setchaku Gakkaishi》 in 2020.Recommanded Product: 2657-87-6 The article conveys some information:

Epoxy monoliths with a co-continuous porous structure were produced by a thermosetting reaction using combinations oi 4 kinds of epoxy resins, 9 kinds of diamine curing agents, and 2 kinds porogens (pore forming agents), and applied to dissimilar materials bonding between metals and engineering plastics. An epoxy monolith was prepared on a stainless or copper plate, and a polycarbonate or poly (phenylene sulfide) plate was thermally welded to prepare a bonding test piece. The heat resistance of the epoxy monolith bonding systems used in this study was evaluated from the results of the tensile shear test before and after heat treatment. In addition, the thermogravimetric anal. of the monolith materials revealed the thermal decomposition behavior of the cured epoxy. Based on these results, the effects of the structure and the number of functional groups of the epoxy resins and the diamine curing agents on the porous structure bonding strength, and heat resistance of the epoxy monoliths were discussed. 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

Reference of 3-(4-Aminophenoxy)aniline《High-performance polymers adapted to facile melt processing through structure design of benzocyclobutene-containing precursors》 was published in 2021. The authors were Jin, Ke;Sun, Qiangsheng;Feng, Yudi;Guo, Jia;Wang, Changchun, and the article was included in《European Polymer Journal》. The author mentioned the following in the article:

High-performance polymeric materials with good processability and enhanced performance (higher thermal stability and mech. strength, higher glass transition temperature (T_g) and lowered thermal expansion) have long been explored by scientists and engineers. The present study demonstrated a new way to fabricate high-performance polymers, such as polyarylamide (traditional polyarylamides can’t be processed by melt processing due to the lack of viscous flow temperature before thermal decomposition), with excellent processability via a facile two-step process, i.e. low-temperature melt processing and a subsequent in-situ thermal curing. Through designing the structure of the BCB-containing precursors, we can well control the m.p. and curing temperature, thus adjust the melt processing temperature and curing temperature of the polymers. In our experiments, the temperature difference between precursor m.p. and polymerization temperature can be over 200°C, providing wide processing window and long storage lifetime. Besides, these precursors also possess excellent solubility in organic solvents, which endow them with the possibility of solution or melt processing, as illustrated by the representative precursor, DODA-BCB. The obtained polymer resin films show good thermal stability (T_d,5% > 410°C), high glass transition temperatures (T_g > 240°C) and good mech. strength (storage modulus > 1.8 GPa). Further studies on the thermal expansion behavior of the films reveal the thermal contracting feature of p-3,4′-ODA-BCB, the mechanism has been discussed in detail using DFT calculations, VT-FTIR and TMA. 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. Reference 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

Ngai, Courtney;Sanchez-Marsetti, Colomba M.;Harman, W. Hill;Hooley, Richard J. published 《Supramolecular Catalysis of the oxa-Pictet-Spengler Reaction with an Endohedrally Functionalized Self-Assembled Cage Complex》. The research results were published in《Angewandte Chemie, International Edition》 in 2020.Application In Synthesis of Dimethoxydiphenylmethane The article conveys some information:

An endohedrally functionalized self-assembled Fe₄L₆ cage complex can catalyze oxa-Pictet-Spengler cyclizations of tryptophols and various aldehyde derivatives, showing strong rate accelerations and size-selectivity. Selective mol. recognition of substrates controls the reactivity, and the cage is capable of binding and activating multiple different species along the multistep reaction pathway. The combination of a functionalized active site, size-selective reactivity, and multistep activation, all from a single host mol., illustrates the biomimetic nature of the catalysis. To complete the study, the researchers used Dimethoxydiphenylmethane (cas: 2235-01-0) .

For example, the most common synthesis of ethers involves the attack of an alkoxide ion on an alkyl halide. This method is called Williamson ether synthesis.Application In Synthesis of Dimethoxydiphenylmethane

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

Synthetic Route of C12H12N2OIn 2021, Winters, Jonas;Dehaen, Wim;Binnemans, Koen published 《N-butyl pyrrolidone/ionic liquid mixtures as benign alternative solvents to N-methyl pyrrolidone for the synthesis of polyaramids》. 《Materials Today Communications》published the findings. The article contains the following contents:

N-Me pyrrolidone (NMP) is a polar aprotic solvent that is critical for the production of polyaramids. However, due to its reprotoxicity and pending REACH restrictions, a benign alternative is needed. A mixture of N-Bu pyrrolidone (NBP) and the ionic liquid [C₈MIm][Cl] is proposed as a promising candidate to replace NMP. This organic electrolyte solution provides a green approach to polyaramid synthesis. 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. Synthetic Route of C12H12N2OEthers 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

Gregg, Brian T.;Golden, Kathryn C.;Quinn, John F. published 《Indium(III)trifluoromethanesulfonate as a mild, efficient catalyst for the formation of acetals and ketals in the presence of acid sensitive functional groups》 in 2008. The article was appeared in 《Tetrahedron》. They have made some progress in their research.Category: ethers-buliding-blocks The article mentions the following:

Aldehydes and ketones, including acetophenone and benzophenone, are readily protected under mild, neutral conditions in the presence of various alcs. or orthoformates and catalytic amounts of indium(III) trifluoromethanesulfonate (<0.8 mol %) under either room temperature or mild heating conditions to give the corresponding cyclic and acyclic acetals and ketals in good to excellent yields. Acid sensitive functional groups, N-Boc, THP, and TBDMS do not undergo competitive deprotection under the reported conditions. The experimental procedure involved many compounds, such as 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. Category: ethers-buliding-blocks 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

Jin, Ke;Sun, Qiangsheng;Feng, Yudi;Guo, Jia;Xu, Jiangtao;Wang, Changchun published 《Significant Influence of Alkyl Substituents in the Alicyclic Rigid Backbone on Solubility and Thermal Stability of Polyarylamide Copolymers》 in 2021. The article was appeared in 《ACS Applied Polymer Materials》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:

Incorporation of alicyclic structural units in a polymer backbone holds great promises for preparing polyarylamides with superior phys. properties (solubility, optical transparency, thermal stability, etc.). In this study, the alicyclic-containing building block, tetraethyl-substituted dibenzocyclooctadiene (TE-DBCOD), was integrated into the backbone of polyarylamides through a unique diamine monomer, TE-DBCOD-NH₂. The TE-DBCOD-containing polyarylamides were synthesized first through polycondensation with different contents of TE-DBCOD units. Compared to the control polymers without DBCOD or Et side-chain units, the polyarylamides with TE-DBCOD units showed better solubility in less polar solvents (m-cresol, pyridine, and tetrahydrofuran) and higher glass transition temperature (T_g), which provides an opportunity to fabricate polyarylamides with both improved solubility and T_g. Meanwhile, we also prepared the poly(amide-imide)s with TE-DBCOD by a two-step method for comparison. In contrast, the aromatic poly(amide-imide)s showed better solubility and lower T_gs than the corresponding aromatic poly(amide-imide)s without TE-DBCOD contents, which revealed the complex influence of structure parameters on different polymers. Addnl., the synthesized polymers possessed high thermal stability (5% weight loss temperature > 440°C) verified by thermogravimetric anal. The strategy of introducing short side chains in polymer backbones opens a window for exploration of polymers with improved solubility and increased T_g simultaneously, which also facilitates the understanding of the structure-property relationship of polymers with alicyclic structural units. 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. Safety of 3-(4-Aminophenoxy)aniline 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: C15H16O2In 1995, Mori, Yuji;Asai, Motoya;Okumura, Akiko;Furukawa, Hiroshi published 《Total synthesis of the polyene macrolide antibiotic roxaticin. I. Synthesis of the polyol fragment of roxaticin using a four-carbon chain extension strategy》. 《Tetrahedron》published the findings. The article contains the following contents:

The C11-C26 polyol fragment, I, of roxaticin containing eight chiral centers has been prepared in a reiterative manner using coupling reactions of chiral dithianes and epoxides followed by stereoselective reductionDimethoxydiphenylmethane (cas: 2235-01-0) were involved in the experimental procedure.

For example, the most common synthesis of ethers involves the attack of an alkoxide ion on an alkyl halide. This method is called Williamson ether synthesis.Formula: C15H16O2

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

Zaitsev, B. A.;Kleptsova, L. G.;Shvabskaya, I. D. published 《Heat-resistant network copolymers based on rolivsans modified with aromatic diamines》 in 2017. The article was appeared in 《Russian Journal of Applied Chemistry》. They have made some progress in their research.Application In Synthesis of 3-(4-Aminophenoxy)aniline The article mentions the following:

Thermochem. transformations of rolivsans with aromatic diamines were studied by IR and NMR (¹H, ¹³C) spectroscopy and by dynamic mech., thermal, and elemental anal. The heat resistance of rolivsans is considerably enhanced by their modification with small additions (10±5%) of an aromatic diamine with curing at 150-300 (320)°C. 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. Application In Synthesis 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