Month: September 2022

Reference of Dimethoxydiphenylmethane《Iron(III) tosylate in the preparation of dimethyl and diethyl acetals from ketones and β-keto enol ethers from cyclic β-diketones》 was published in 2008. The authors were Mansilla, Horacio;Afonso, Maria M., and the article was included in《Synthetic Communications》. The author mentioned the following in the article:

An efficient method for conversion of ketones to their corresponding di-Me and di-Et acetals and of cyclic β-diketones into β-keto enol ethers using Fe(OTs)₃ as a catalyst is described. 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.Reference of Dimethoxydiphenylmethane

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

Blumel, Marcus;Nagasawa, Shota;Blackford, Katherine;Hare, Stephanie R.;Tantillo, Dean J.;Sarpong, Richmond published 《Rearrangement of Hydroxylated Pinene Derivatives to Fenchone-Type Frameworks: Computational Evidence for Dynamically-Controlled Selectivity》. The research results were published in《Journal of the American Chemical Society》 in 2018.Related Products of 2235-01-0 The article conveys some information:

An acid-catalyzed Prins/semipinacol rearrangement cascade reaction of hydroxylated pinene derivatives that leads to tricyclic fenchone-type scaffolds in very high yields and diastereoselectivity has been developed. Quantum chem. anal. of the selectivity-determining step provides support for the existence of an extremely flat potential energy surface around the transition state structure. This transition state structure appears to be ambimodal, i.e., the fenchone-type tricyclic scaffolds are formed in preference to the competing formation of a bornyl (camphor-type) skeleton under dynamic control via a post-transition state bifurcation (PTSB). 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. Related Products of 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

Kawabata, Tomonori;Kato, Masaki;Mizugaki, Tomoo;Ebitani, Kohki;Kaneda, Kiyotomi published 《Highly efficient deprotection of acetals by titanium cation-exchanged montmorillonite as a strong solid acid catalyst》. The research results were published in《Chemistry Letters》 in 2003.HPLC of Formula: 2235-01-0 The article conveys some information:

Deprotection of various kinds of acetals proceeded efficiently in the presence of Ti⁴⁺-exchanged montmorillonite as a recyclable strong solid acid catalyst. Other metal-exchanged montmorillonites were also used in deprotection of dimethoxydiphenylmethane. 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. HPLC of Formula: 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

HPLC of Formula: 2657-87-6《Preparation of high temperature resistant Ag/PI/Cu composite nano particles inserted with PI insulating layer》 was published in 2018. The authors were Qu, Chunyan;Li, Liaoliao;Liu, Changwei;Wag, Dezhi;Xiao, Wanbano;Zhu, Guangyu;Cao, Zhibo;Li, Hongfeng;Su, Kai, and the article was included in《Journal of Polymer Research》. The author mentioned the following in the article:

Polyimide (PI)@copper (Cu) composite nano particles have been successfully synthesized from poly(amic acid) triethylamine salts (PAAS) and Cu(II) ions via a one-step high-temperature induction/imidization route. The formation of PI@Cu nano particles has been investigated by the stoichiometric ratio of PAAS and Cu ion. The resulting products, formed stable shell-core structures, exhibited the uniform core-size and thick shell layer. Addnl., the multi-layer structure, Ag@PI@Cu, was successfully prepared via a post process of PI@Cu nanoparticles. The morphol. of the formed “Sunflower-mode” structure, with the pistil of Cu, the sunflower seed of PI, and the petal of Ag, was also characterized by SEM and TEM. Both elec. resistivity and thermal conductivity of nano particles were measured. The coefficient of heat conduction of Ag@PI@Cu is even 255 times, 754 times, 3081 times, and 1310 times as large as PI@Cu in 50 °C, 100 °C, 150 °C, and 200 °C, resp. The resistance of both nano particles is that the result of Rs_PI/Cu and Rs_Ag/PI/Cu is 11.0*10⁹ ω and 0.11 ω, resp., and also the difference between them is more than 10¹². 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. 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

COA of Formula: C12H12N2OIn 2019, Zhou, Dianrui;Yuan, Lili;Hong, Weijie;Zhang, Haoyang;Hu, Aijun;Yang, Shiyong published 《Molecular design of interpenetrating fluorinated polyimide network with enhanced high performance for heat-resistant matrix》. 《Polymer》published the findings. The article contains the following contents:

Novel reactive phenylethynyl-endcapped diluents were synthesized and phys. mixed with fluorinated cooligoimides (mol. weights of 5000 g/mol) derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl)-4,4′-diamino biphenyl (TFDB) and para-phenylenediamine (p-PDA) at 25/75 M ratio, and 4-phenylethyethynylphthalic anhydride (PEPA) to formulate blends served as matrix resins for developing high-performance composites with excellent processabilities. The uncured blend shows very low min. melt viscosity (<1 Pa s) and extended process window achieved using molten solvation of reactive diluent to prevent intermol. interactions and recrystallization at higher temperature This blend was converted to interpenetrating polyimide network through thermal-curing of phenylethynyl end-groups in each constituent. The morphol., relaxation transition and mech. property were investigated as functions of mass fraction and chem. configuration of reactive diluent. The covalent incorporation of crosslink structures restricts segmental motion while backbone linkage induces strength and toughness retention. This cooperative effect endows homogeneous networks with high glass transition temperatures (435 °C) and flexural strength (130 MPa) simultaneously.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. COA of Formula: 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

Choi, Young Chul;Kim, Min Su;Ryu, Kyoung Moon;Lee, Sang Hoon;Jeong, Young Gyu published 《Synthesis and Characterization of Aromatic Poly(azomethine ether)s with Different meta- and para-Phenylene Linkage Contents》. The research results were published in《Fibers and Polymers》 in 2020.Product Details of 2657-87-6 The article conveys some information:

New aromatic poly(azomethine ether)s (PAMEs) bearing different meta- and para-phenylene linkage ratios in the main chains were synthesized via solution polycondensation reactions of terephthalaldehyde and/or isophthaldehyde with 3,4′-diaminodiphenyl ether. The mol. structures, thermal stability, thermo-mech. and optical properties of the synthesized PAME homopolymers and copolymers were investigated by using FT-IR, TGA, DMA, and UV-visible/ fluorescence spectroscopy, resp. The synthesized PAMEs were characterized to be thermally stable up to ∼400° under nitrogen or air atm. and to have high char residues of above 55% at 800° under nitrogen condition. The DMA data revealed that the glass transition temperatures of PMAEs are in the range of 150-200°, depending on the relative contents of meta- and para-phenylene linkages. The maximum absorption wavelength of transparent yellowish PAME films was detected at 410 ±10 nm. In addition, all PAME films exhibited a broad visible emission band at 500-800 nm and two IR emission bands at 800-1400 nm. The synthesized PAMEs with high thermal stability and thermo-mech. performance can be thus used as functional polymeric materials for tech. fibers, optoelectronic films, and carbon fiber precursors.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 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. Product Details 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

Wang, Kai;Yuan, Xiaojie;Zhan, Maosheng published 《Comparison between microwave and thermal curing of a polyimide adhesive end-capped with phenylethynyl groups》 in 2017. The article was appeared in 《International Journal of Adhesion and Adhesives》. They have made some progress in their research.COA of Formula: C12H12N2O The article mentions the following:

Microwave energy was investigated to cure phenylethynyl-end-capped polyimide adhesive using an industrial microwave oven at a frequency of 2.45 GHz and the adhesive properties, thermal performance and curing mechanism for bonding stainless steel were evaluated. The results are compared with those of thermal cured samples. It was demonstrated that while the lap shear strength properties and thermal performance of microwave cured samples were almost as good as those cured via a thermal process, the microwave curing process resulted in a significant reduction in the process cycle time and power consumption. The Fourier transform IR (FTIR) spectroscopy and XPS anal. of the cured resin structures suggested that there was no obvious difference in the chem. reactions taking place during the microwave and the thermal cure processes.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. COA of Formula: 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

Category: ethers-buliding-blocksIn 2010, Jung, Misuk;Yoon, Jieun;Kim, Hak Sung;Ryu, Jae-Sang published 《Mild and chemoselective synthesis and deprotection of geminal diacetates catalyzed by titanium(IV) halides》. 《Synthesis》published the findings. The article contains the following contents:

A novel, mild, and chemoselective method was developed for the preparation of gem-diacetates from aldehydes and Ac₂O in the presence of TiF₄ (1-5 mol%) under solvent-free conditions at room temperature The reaction showed a high chemoselectivity toward aldehydes in the presence of ketones. Moreover, TiF₄ also catalyzed the deprotection of gem-diacetates to the corresponding aldehydes in water. .This efficient and simple method has several benefits, including the use of an inexpensive catalyst, solvent-free conditions, mild reaction temperatures, and high yields, which make it both cost-effective and environmentally friendly. 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. 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;Huang, Yuhui;Feng, Yudi;Guo, Jia;Xu, Jiangtao;Wang, Changchun published 《Soluble, Thermally Stable, and Low Thermal Expansion Polyarylamides Enabled by a Seven-Membered Carbocycle》. The research results were published in《ACS Applied Polymer Materials》 in 2020.Computed Properties of C12H12N2O The article conveys some information:

Soluble, thermally, and dimensionally stable polyarylamides have been a long-standing challenge for polymer chemists and materials scientists. Herein, we designed and synthesized a series of polyarylamides with various contents of the seven-membered carbocycle unit of 1,2:4,5-dibenzocycloheptadiene (DBCHD) as the linkage in the polymer backbones. In comparison to their analog with an ether linkage, these advanced polyarylamides showed improved thermal stability (5% weight loss temperature, 413-480°) and elevated glass transition temperatures (218-243°) depending on the content of the DBCHD unit. Given the good solubility in polar aprotic solvents, the polyarylamide films were prepared by simple and straightforward solution casting, which presented excellent optical transparency and low coefficient of thermal expansion (CTE). The polyarylamide with the highest content of DBCHD (43.5 wt %) showed a CTE value of 41.0 ppm/K in the temperature range of 0-150°, which is 43% lower than that of the corresponding ether-linked polyarylamide film. Variable-temperature ¹H NMR demonstrated that the nonplanar and moderately rigid structural features of DBCHD units in polymer backbones are the key influence factors that contribute to thermal stability and reduced thermal expansion. 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. Computed Properties of 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