Category: ethers-buliding-blocks

Wang, Qihua;Bai, Yongkang;Chen, Yu;Ju, Junping;Zheng, Fei;Wang, Tingmei published 《High performance shape memory polyimides based on π-π interactions》 in 2015. The article was appeared in 《Journal of Materials Chemistry A: Materials for Energy and Sustainability》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:

A series of polyimides (PIs) with different chain structures were synthesized by a two-step method. The influences of chain conformations on their thermal and mech. properties were investigated by dynamic mech. anal., thermogravimetric anal., as well as by a universal testing machine. All PIs exhibited high glass transition temperature (>240 °C) and thermal decomposition temperature (>480 °C). Moreover, all these PIs could show shape memory properties more or less, especially ODA-BPDA with a shape recovery ratio (R_r) greater than 93%. The high value of R_r was mainly due to the existence of π-π interaction, a type of non-covalent interaction. The dependence of R_r on π-π interaction was investigated in detail by UV-vis spectroscopy. Finally, at. oxygen (AO) exposure experiments showed that the shape memory properties of ODA-BPDA were affected little by the erosion due to AO. 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. 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

Quality Control of Dimethoxydiphenylmethane《Direct Transformation of Silica from Natural Resources to Form Tetramethoxysilane》 was published in 2020. The authors were Putro, Wahyu S.;Fukaya, Keisuke;Choi, Jun-Chul;Choi, Seong Jib;Horikoshi, Toshio;Sato, Kazuhiko;Fukaya, Norihisa, and the article was included in《Bulletin of the Chemical Society of Japan》. The author mentioned the following in the article:

A simple and practical method for direct synthesis of tetramethoxysilane (TMOS) from silica (SiO₂) and methanol was achieved using a base catalyst and acetal as a dehydrant under carbon dioxide (CO₂). The production of TMOS was strongly influenced by the kind of the acetal used, with 2,2-dimethoxypropane identified as the most effective dehydrant. Authors observed that the acetal used enabled the production of a high yield of di-Me carbonate (DMC), which promoted the TMOS production DMC is an intermediate product from the reaction of CO₂ and methanol, which supported the SiO2 depolymerization process. When the reaction is conducted with 2,2-dimethoxypropane at 260° for 24 h, TMOS can be produced in up to 59% yield. For practical applications, the TMOS synthesis has been developed on a 250 mL and 1 L-scale reaction with constant yield (>50%) from various silica resources. 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.Quality Control of Dimethoxydiphenylmethane

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

Zhou, Haoran;Yu, Weimiao;Qu, Chunyan;Liu, Changwei;Wang, Dezhi published 《Facile one-step synthesis of PI/Fe₃O₄ composite microspheres from poly(amic acid) triethylamine salts and Fe(III) ion》 in 2015. The article was appeared in 《Journal of Materials Science: Materials in Electronics》. They have made some progress in their research.Synthetic Route of C12H12N2O The article mentions the following:

Polyimide/magnetite composite microspheres were successfully prepared from poly(amic acid) triethylamine salts and Fe(III) ion via a simple one-step solvothermal process. The formation mechanism of the composite microspheres was explored. The morphol. and the structure of the samples were characterized. It was found that polyimide has successfully coated on the surface of the magnetite microspheres and penetrated throughout the crystals via an assembly process. And the magnetic and thermal properties were measured, the results showing that composite microspheres have excellent thermal stabilities and the saturation magnetization is 35.29 emu/g with PI content of 60 wt%.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. 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

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