Month: September 2022

Hong, Wei-Jie;Yuan, Li-Li;Zhang, Hao-Yang;Cui, Chao;Chen, Wei;Yang, Shi-Yong published 《Phenylethynyl-terminated Imide Oligomers Modified by Reactive Diluent for Resin Transfer Molding Application》. The research results were published in《Chinese Journal of Polymer Science》 in 2022.Product Details of 2657-87-6 The article conveys some information:

To meet the processing requirements of resin transfer molding (RTM) technol., reactive diluent containing m-phenylene moiety was synthesized to phys. mixed with phenylethynyl terminated co-oligo imides with well-designed mol. weights of 1500-2500 g/mol derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 3,4′-oxydianiline (3,4′-ODA) and m-phenylenediamine (m-PDA). This blend shows low min. melting viscosity (<1 Pa·s) and enlarged processing temperature window (260-361°C). FPI-R-1 stays below 1 Pa·s for 2 h at 270°C. The relationship between the mol. weight of the blend and its melting stability was first explored. Blending oligo-imides with lower mol. weights exhibit better melting stability. Upon curing at 380°C for 2 h, the thermosetting polyimide resin demonstrates superior heat resistance (T_g=420-426°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 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

Larson, Gerald L.;Fry, James L. published 《Ionic and organometallic-catalyzed organosilane reductions》. The research results were published in《Organic Reactions (Hoboken, NJ, United States)》 in 2008.Application In Synthesis of Dimethoxydiphenylmethane The article conveys some information:

A review on the use of organosilanes as reducing agents in organic synthesis.Dimethoxydiphenylmethane (cas: 2235-01-0) were involved in the experimental procedure.

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. Application In Synthesis 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《Synthesis and characterization of novel aromatic polyimides from Z-type sexiphenyltetracarboxylic dianhydride and aromatic diamines》 was published in 2014. The authors were Nakagawa, Takafumi;Morikawa, Atsushi, and the article was included in《Polymer Journal (Tokyo, Japan)》. The author mentioned the following in the article:

A Z-type sexiphenyltetracarboxylic dianhydride, 3,3””’,4,4””’-1,1′:2′,1”:4”,1”’:4”’,1””:2””,1””’-sexiphenyltetracarboxylic dianhydride (1), was synthesized in seven steps from di-Et 4-bromophthalate. New aromatic polyimides (PI1x) containing the Z-type sexiphenyl unit were synthesized from 1 and various aromatic diamines (x) by both conventional two- and one-step procedures. The inherent viscosities of PI1x produced by the one-step procedure were 0.23-1.21, which is much higher than those of the polyimides produced by the two-step procedure. The polyimides PI1x were characterized by x-ray diffraction, differential scanning calorimetry, thermogravimetry and dynamic mech. anal. (DMA). The structure-property relationships of the polyimides PI1x were compared with those of the polyimides (PI2x) previously prepared from rigid 3,3””’, 4,4””’-p-sexiphenyltetracarboxylic dianhydride (2), which is an isomer of 1. The glass transition (T_g) temperatures were much higher (270-345 °C) than those of the corresponding PI2x, and the decrease in the storage modulus at T_g was larger than that of the corresponding PI2x. The polyimides PI1x showed lower dielec. constants (ε) and were soluble in polar organic solvents at room or elevated temperature in contrast with PI2x. The Z-type structure significantly influences the properties of polyimides containing sexiphenylene units. 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. 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

Gao, Guanru;Zhang, Songqi;Wang, Liquan;Lin, Jiaping;Qi, Huimin;Zhu, Junli;Du, Lei;Chu, Ming published 《Developing Highly Tough, Heat-Resistant Blend Thermosets Based on Silicon-Containing Arylacetylene: A Material Genome Approach》. The research results were published in《ACS Applied Materials & Interfaces》 in 2020.Safety of 3-(4-Aminophenoxy)aniline The article conveys some information:

Silicon-containing arylacetylene (PSA) resins exhibit excellent heat resistance, yet their brittleness limits the applications. We proposed using acetylene-terminated polyimides (ATPI) as an additive to enhance the toughness of the PSA resins and maintain excellent heat resistance. A material genome approach (MGA) was first established for designing and screening the acetylene-terminated polyimides, and a polyimide named ATPI was filtered out by using this MGA. The ATPI was synthesized and blended with PSA resins to improve the toughness of the thermosets. Influences of the added ATPI contents and prepolymerization temperature on the properties were examined The result shows that the blend resin can resist high temperature and bear excellent mech. properties. The mol. dynamics simulations were carried out to understand the mechanism behind the improvement of toughness. The present work provides a method for the rapid design and screening of high-performance polymeric materials. 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

Tanemura, Kiyoshi;Suzuki, Tsuneo published 《Highly efficient acetalization of carbonyl compounds catalyzed by aniline-aldehyde resin salts》 in 2015. The article was appeared in 《Chemistry Letters》. They have made some progress in their research.Reference of Dimethoxydiphenylmethane The article mentions the following:

Mild procedures for the syntheses of ethylene acetals, e.g., I, and di-Me acetals, e.g., II, from the corresponding aldehydes and ketones catalyzed by 1 mol % of aniline-aldehyde resin salts are described. This methodol. is also useful for the synthesis of di-Me acetals of diaryl ketones. 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. Reference 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

Piergentili, Alessandro;Gentili, Francesco;Ghelfi, Francesca;Marucci, Gabriella;Pigini, Maria;Quaglia, Wilma;Giannella, Mario published 《Muscarinic subtypes profile modulation within a series of new antagonists, bridged bicyclic derivatives of 2,2-Diphenyl-[1,3]-dioxolan-4-ylmethyl-dimethylamine》. The research results were published in《Bioorganic & Medicinal Chemistry》 in 2003.HPLC of Formula: 2235-01-0 The article conveys some information:

A set of new muscarinic antagonists, bridged bicyclic derivatives of 2,2-diphenyl-[1,3]-dioxolan-4-ylmethyl-dimethylamine, was synthesized and tested to evaluate their affinity and selectivity for M₁, M₂, M₃ and M₄ receptor subtypes. The conformational constraint of the lead compound in a bicyclic structure, and the variation in distance and stereochem. of the active functions allowed us to modulate the selectivity of interaction with the M₁-M₃ receptor subtypes. The most interesting compound was (cis,trans)-2-(2,2-diphenylethyl)-5-methyl-tetrahydro-[1,3]dioxolo[4,5-c]pyrrole oxalate (I oxalate), which is equipotent with Pirenzepine on rabbit vas deferens (M₁-putative) but shows a better selectivity profile.Dimethoxydiphenylmethane (cas: 2235-01-0) were involved in the experimental procedure.

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

Banerjee, Ashutosh;Schepmann, Dirk;Koehler, Jens;Wuerthwein, Ernst-Ulrich;Wuensch, Bernhard published 《Synthesis and SAR studies of chiral non-racemic dexoxadrol analogues as uncompetitive NMDA receptor antagonists》. The research results were published in《Bioorganic & Medicinal Chemistry》 in 2010.Quality Control of Dimethoxydiphenylmethane The article conveys some information:

A series of chiral non-racemic dexoxadrol analogs with various substituents in position 4 of the piperidine ring was synthesized and pharmacol. evaluated. Only the enantiomers having (S)-configuration at the 2-position of the piperidine ring and 4-position of the dioxolane ring were considered. Key steps in the synthesis were an imino-Diels-Alder reaction of enantiomerically pure imine (S)-13, which had been obtained from D-mannitol, with Danishefsky’s Diene 14 and the replacement of the p-methoxybenzyl protective group with a Cbz-group. It was shown that (S,S)-configuration of the ring junction (position 2 of the piperidine ring and position 4 of the dioxolane ring) and axial orientation of the C-4-substituent ((4S)-configuration) are crucial for high NMDA receptor affinity. 2-(2,2-Diphenyl-1,3-dioxolan-4-yl)piperidines with a hydroxy moiety ((S,S,S)-5 (I), K_i = 28 nM), a fluorine atom ((S,S,S)-6 (II), WMS-2539, K_i = 7 nM) and two fluorine atoms ((S,S)-7 (III), K_i = 48 nM) in position 4 represent the most potent NMDA antagonists with high selectivity against σ₁ and σ₂ receptors and the polyamine binding site of the NMDA receptor. The NMDA receptor affinities of the new ligands were correlated with their electrostatic potentials, calculated gas phase proton affinities (neg. enthalpies of deprotonation) and dipole moments. According to these calculations decreasing proton affinity and increasing dipole moment are correlated with decreasing NMDA receptor affinity. 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

Product Details of 2235-01-0《Environmentally friendly organic synthesis using bismuth compounds: bismuth(III) iodide catalyzed deprotection of acetals in water》 was published in 2008. The authors were Bailey, Aaron D.;Baru, Ashvin R.;Tasche, Kendall K.;Mohan, Ram S., and the article was included in《Tetrahedron Letters》. The author mentioned the following in the article:

The chemoselective deprotection of a wide range of acetals and ketals in water is catalyzed by bismuth(III) iodide. Bismuth(III) compounds are remarkably nontoxic and hence are attractive as environmentally friendly catalysts. 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.Product Details of 2235-01-0

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

Ozawa, Hiroki;Ishiguro, Eriko;Kyoya, Yuri;Kikuchi, Yasuaki;Matsumoto, Toshihiko published 《Colorless Polyimides Derived from an Alicyclic Tetracarboxylic Dianhydride, CpODA》. The research results were published in《Polymers (Basel, Switzerland)》 in 2021.Recommanded Product: 3-(4-Aminophenoxy)aniline The article conveys some information:

An alicyclic tetracarboxylic dianhydride having cyclopentanone bis-spironorbornane structure (CpODA) was polycondensated with aromatic dianhydrides to form the corresponding poly(amic acid)s which possessed logarithmic viscosities in the range 1.47-0.54 dL/g. The poly(amic acid) was imidized by three methods: a chem., a thermal, and a combined chem. and thermal process. In a thermal method, imidization temperature markedly influenced the film quality and mol. weight of the polyimide. When the poly(amic acid) was cured over the Tg of the corresponding polyimide, the flexible polyimide films were obtained and the mol. weights increased several times, which means that the post-polymerization took place. In spite of low-temperature cure below Tg flexible films with the imidization ratio of 100% were fabricated by a combined chem. and thermal imidization technique. The films possessed the decomposition temperatures in a range of 475-501°C and Tgs over 330°C. The high Tg results from a dipole-dipole interaction between the keto groups of the polymer chains as well as development of the rigid polyalicyclic unit. The polyimide films exhibited CTE between 17 and 57 ppm/K. All the films fabricated were entirely colorless and possessed the λcut-offs shorter than 337 nm. Notably, the films prepared by a chem. method exhibited outstanding optical properties. 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. Recommanded Product: 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

Kantam, M. Lakshmi;Swapna, V.;Santhi, P. Lakshmi published 《MoO₂(acac)₂– a mild and efficient catalyst for the deprotection of acetals》. The research results were published in《Synthetic Communications》 in 1995.Recommanded Product: 2235-01-0 The article conveys some information:

Molybdenyl(VI) acetylacetonate is an effective catalyst for the deprotection of acetals into the corresponding aldehydes and ketones, in good yields. To a solution of (dimethoxymethyl)-4-methylbenzene in MeCN was added MoO₂(acac)₂ under N to give after 4 g p-tolualdehyde. 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.Recommanded Product: 2235-01-0

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