Tag: 200-300

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

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

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

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

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

Okano, Tamon;Michihashi, Tomonori;Kiji, Jitsuo published 《Acetalization of ketones and aldehydes catalyzed by lanthanoid trisulfonates》 in 1995. The article was appeared in 《Applied Organometallic Chemistry》. They have made some progress in their research.Name: Dimethoxydiphenylmethane The article mentions the following:

Lanthanoid sulfonates are good catalysts for the acetalization of aldehydes and ketones with Me orthoformate in methanol. The catalytic activity of Ln(OTf)₃ (OTf = trifluoromethanesulfonate) increases in the order of La < Sm < Gd < Er < Yb. Since sulfonates such as trifluoromethylsulfonates and (1S)-10-camphorsulfonates are more soluble in organic solvents than the chlorides, the acetalization in ether or dichloromethane and the exchange reaction of alkoxy groups between acetals and alcs. can be achieved under mild conditions. 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. Name: 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

Recommanded Product: 3-(4-Aminophenoxy)aniline《Kinetic study of copolymerized PMIA with ether moiety under air pyrolysis》 was published in 2020. The authors were Li, Na;Zhang, Xingke;Yu, Junrong;Wang, Yan;Zhu, Jing;Hu, Zuming, and the article was included in《Journal of Thermal Analysis and Calorimetry》. The author mentioned the following in the article:

Copolymerized poly(m-phenylene isophthalamide) (co-PMIA) was synthesized by solution polycondensation using m-phenylenediamine and isophthaloyl dichloride and 3,4′-oxydianiline (3,4′-ODA). This paper described the preparation and characterization of the copolymers from various contents 3,4′-ODA to afford co-PMIA with ideal high mol. mass. The copolymer showed excellent thermal stability with the glass transition temperature of 267°C and the onset decomposition temperature (5% mass loss) of 445°C. The thermal degradation of co-PMIA was measured with various thermal anal. techniques; the pyrolysis products were obtained and analyzed under air atm. The possible thermal decomposition mechanism of co-PMIA was discussed. The present pyrolysis was investigated using TG under air atm. at four different heating rates (5-20°C min^-1). Three different kinetic methods, the iso-conversional Ozawa-Flynn-Wall and Kissinger and Crane methods were applied on TG data of co-PMIA to calculate the kinetic parameters including activation energy, pre-exponential factor and reaction order.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. Recommanded Product: 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

Shim, You-Jin;Choi, Kihang published 《Cyclic Ketals of Tartaric Acid: Simple and Tunable Reagents for the Determination of the Absolute Configuration of Primary Amines》 in 2010. The article was appeared in 《Organic Letters》. They have made some progress in their research.Quality Control of Dimethoxydiphenylmethane The article mentions the following:

2,2-Diphenyl-[1,3]dioxolane-4,5-dicarboxylic acid (DPD) and 2,2-dinaphthalen-2-yl-[1,3]dioxolane-4,5-dicarboxylic acid (DND) have been synthesized starting from di-Me tartrate. DPD and DND amides of α-chiral primary amines showed significantly different ¹H chem. shift values depending on the stereochem. of the derivatizing agent. On the basis of this chem. shift difference, the absolute configuration of amine substrates could be assigned. DND amides showed significantly larger chem. shift differences than the corresponding DPD amides allowing for a more error-free assignment. 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. 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

Zhang, Shuai;Perveen, Saima;Ouyang, Yizhao;Xu, Liang;Yu, Tao;Zhao, Min;Wang, Linghua;Song, Peidong;Li, Pengfei published 《Design and Synthesis of Tunable Chiral 2,2′-Bipyridine Ligands: Application to the Enantioselective Nickel-Catalyzed Reductive Arylation of Aldehydes》 in 2022. The article was appeared in 《Angewandte Chemie, International Edition》. They have made some progress in their research.Safety of Dimethoxydiphenylmethane The article mentions the following:

A new class of chiral 2,2′-bipyridine ligands, SBpy, featuring minimized short-range steric hindrance and structural tunability was rationally designed and developed, and the effectiveness was demonstrated in the first highly enantioselective Ni-catalyzed addition of aryl halides to aldehydes. In comparison with known approaches using preformed aryl metallic reagents, this reaction is more step-economical and functional group tolerant. The reaction mechanism and a model of stereocontrol were proposed based on exptl. and computational results. 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. Safety 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

Reference of 3-(4-Aminophenoxy)aniline《Unraveling Factors Leading to High Pseudocapacitance of Redox-Active Small Aromatics on Graphene》 was published in 2019. The authors were Zhao, Yi;Wang, Xiaoxu;Wang, Na;Li, Ming;Li, Qi;Liu, Jinzhang, and the article was included in《Journal of Physical Chemistry C》. The author mentioned the following in the article:

Graphene sheets functionalized by redox-active small aromatics can exhibit enhanced capacitance because of the introduced faradaic process. However, the immense number of possible mols. for energy storage makes the selection of the appropriate ones difficult. This study combines experiment and theory to unveil factors behind the different pseudocapacitance contributions of some aromatic isomers adsorbed onto graphene, aiming to provide a guideline for computationally screening out optimal mols. for supercapacitor electrodes. Eight kinds of mols. containing amino groups are intentionally selected to functionalize N-doped graphene (NG) and their electrochem. properties are compared. The HOMO level of a mol. is found to play an important role in rendering a high pseudocapacitance. Also, remarkable efficacies from two kinds of mols., 4-aminophenol and 1,5-naphthalenediamine (1,5-NAPD), are unveiled, and the role of the amino group in charge storage is discussed. As a result, the graphene film absorbed with 1,5-NAPD mols. shows a high specific gravimetric capacitance of 877 F/g within the voltage window of 1 V, corresponding to a high areal specific capacitance of 1.14 F/cm² from the thin film with a mass loading of 1.3 mg/cm². Also, the 1,5-NAPD/NG film shows good cycling stability, achieving 105% capacitance retention after 5000 charge-discharge cycles.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. Reference 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