Month: February 2023

Effect of heavy metal residues in mechanical pulp on color reversion was written by Park, Je-Seung;Yoon, Byung-Ho. And the article was included in Palpu, Chongi Gisul in 1995.COA of Formula: C11H16O3 This article mentions the following:

The amount of heavy metal, i.e., Cu, Fe, or Mn, removed by the chelating agent used in the pretreatment for H₂O₂ bleaching was investigated, and the effect of heavy metal and lignin (I) model added to bleached thermomech. pulp (BTMP) and filter paper followed by photoirradiation on discoloration was examined Treatment with DTPA showed the most efficient chelating effect among 3 chelating agents, i.e., EDTA, DTPA, and STPP, which were added to unbleached TMP. Much of the Fe remained after chelation, but Mn was easily removed. The heavy metal added artificially to BTMP showed a decrease of brightness with increasing irradiation time. The formation of a complex between I and Fe conspicuously decreased brightness. The successive doping of Fe and 3,4-dihydroxy benzaldehyde among combinations of heavy metals and I models added artificially to BTMP showed a remarkable drop in brightness. This was caused by the easy formation of a complex between the heavy metal and I having neighboring OH groups. When the heavy metal and I model were artificially, resp. or together, added to filter paper, even filter paper treated with only Fe decreased in brightness. This was caused by the oxidation of cellulose itself and the formation of a little complex between the heavy metal and cellulose. In the experiment, the researchers used many compounds, for example, 3-(3,4-Dimethoxyphenyl)propan-1-ol (cas: 3929-47-3COA of Formula: C11H16O3).

3-(3,4-Dimethoxyphenyl)propan-1-ol (cas: 3929-47-3) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. Ethyl ether is an excellent solvent for extractions and for a wide variety of chemical reactions. It is also used as a volatile starting fluid for diesel engines and gasoline engines in cold weather. Dimethyl ether is used as a spray propellant and refrigerant. Methyl t-butyl ether (MTBE) is a gasoline additive that boosts the octane number and reduces the amount of nitrogen-oxide pollutants in the exhaust. The ethers of ethylene glycol are used as solvents and plasticizers.COA of Formula: C11H16O3

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

Microwave-Assisted Cross-Coupling and Hydrogenation Chemistry by Using Heterogeneous Transition-Metal Catalysts: An Evaluation of the Role of Selective Catalyst Heating was written by Irfan, Muhammed;Fuchs, Michael;Glasnov, Toma N.;Kappe, C. Oliver. And the article was included in Chemistry – A European Journal in 2009.Formula: C15H14O3 This article mentions the following:

The concept of specific microwave effects in solid/liquid catalytic processes resulting from the selective heating of a microwave-absorbing heterogeneous transition-metal catalyst by using 2.45 GHz microwave irradiation was evaluated. As model transformations Ni/C-, Cu/C-, Pd/C-, and Pd/Al₂O₃-catalyzed carbon-carbon/carbon-heteroatom cross-couplings and hydrogenation reactions were studied. To probe the existence of specific microwave effects by selective catalyst heating in these transformations, control experiments comparing microwave dielec. heating and conventional thermal heating at the same reaction temperature were performed. Although the supported metal catalysts were exptl. found to be strongly microwave absorbing, for all chem. examples studied herein no differences in reaction rate or selectivity between microwave and conventional heating experiments under carefully controlled conditions were observed This was true also for reactions that use low-absorbing or microwave transparent solvents, and was independent of the microwave absorptivity of the catalyst support material. In the case of hydrogenation reactions, the stirring speed is a critical factor on the mass transfer between gas and liquid phase, influencing the rate of the hydrogenation in both microwave and conventionally heated experiments In the experiment, the researchers used many compounds, for example, 1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8Formula: C15H14O3).

1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O閳ユ椊 or N閳ユ椊 bonds. The ability to form hydrogen bonds with other compounds makes ethers particularly good solvents for a wide variety of organic compounds and a surprisingly large number of inorganic compounds.Formula: C15H14O3

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

p-tert-Butylcalix[4]arenes containing azacrown ether substituents at the lower rim as potential polytopic receptors was written by Alekseeva, E. A.;Basok, S. S.;Mazepa, A. V.;Luk’yanenko, A. P.;Snurnikova, O. V.;Gren, A. I.. And the article was included in Russian Journal of General Chemistry in 2013.COA of Formula: C10H21NO4 This article mentions the following:

A series of disubstituted p-tert-butylcalix[4]arenes with N-methoxycarbonylmonoazacrown ether and N-ethoxymonoazacrown ether residues at the lower rim has been prepared via the reaction of di(carboxymethoxy)-p-tert-butylcalix[4]arene with azacrown ethers and subsequent reduction of the resulting amide derivatives Using UV titration and ¹H NMR spectroscopy we have demonstrated the ability of the calixarene with two N-carbonylmonoaza-18-crown-6-ether substituents to form the 1:3 complexes with K⁺ and Na⁺ and the 1:2 complexes with Cs⁺, Sr²⁺, Cu²⁺, and Zn²⁺. The calixarene with two fragments of N-ethoxymonoaza-18-crown ether has formed binuclear complexes with alkali metals cations and mononuclear complexes with transition metals cations. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3COA of Formula: C10H21NO4).

1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. Ethers feature bent C閳ユ彊閳ユ弲 linkages. In dimethyl ether, the bond angle is 111鎺?and C閳ユ彊 distances are 141 pm. The barrier to rotation about the C閳ユ彊 bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.COA of Formula: C10H21NO4

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

Natural Gas Residual Fluids: Sources, Endpoints, and Organic Chemical Composition after Centralized Waste Treatment in Pennsylvania was written by Getzinger, Gordon J.;O’Connor, Megan P.;Hoelzer, Kathrin;Drollette, Brian D.;Karatum, Osman;Deshusses, Marc A.;Ferguson, P. Lee;Elsner, Martin;Plata, Desiree L.. And the article was included in Environmental Science & Technology in 2015.Recommanded Product: 1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol This article mentions the following:

Volumes of natural gas extraction-derived wastewaters have increased sharply over the past decade, but the ultimate fate of those waste streams is poorly characterized. We sought to (a) quantify natural gas residual fluid sources and endpoints to bound the scope of potential waste stream impacts and (b) describe the organic pollutants discharged to surface waters following treatment, a route of likely ecol. exposure. Our findings indicate that centralized waste treatment facilities (CWTF) received 9.5% (8.5 鑴?10⁸ L) of natural gas residual fluids in 2013, with some facilities discharging all effluent to surface waters. In dry months, discharged water volumes were on the order of the receiving body flows for some plants, indicating that surface waters can become waste-dominated in summer. As disclosed organics used in high volume hydraulic fracturing (HVHF) vary greatly in physicochem. properties, we deployed a suite of anal. techniques to characterize CWTF effluents, covering 90.5% of disclosed compounds Results revealed that, of 閳?000 disclosed organics used in HVHF, only petroleum distillates and alc. polyethoxylates were present. Few analytes targeted by regulatory agencies (e.g., benzene or toluene) were observed, highlighting the need for expanded and improved monitoring efforts at CWTFs. In the experiment, the researchers used many compounds, for example, 1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol (cas: 20324-33-8Recommanded Product: 1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol).

1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol (cas: 20324-33-8) belongs to ethers. Ethers are good solvents partly because they are not very reactive. Most ethers can be cleaved, however, by hydrobromic acid (HBr) to give alkyl bromides or by hydroiodic acid (HI) to give alkyl iodides. Electron-deficient reagents are also stabilized by ethers. For example, borane (BH3) is a useful reagent for making alcohols. Pure borane exists as its dimer, diborane (B2H6), a toxic gas that is inconvenient and hazardous to use. Borane forms stable complexes with ethers, however, and it is often supplied and used as its liquid complex with tetrahydrofuran (THF).Recommanded Product: 1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol

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

Organic pollutants in the effluents of large wastewater treatment plants in Sweden was written by Paxeus, Nicklas. And the article was included in Water Research in 1996.Category: ethers-buliding-blocks This article mentions the following:

Effluent from the 3 largest wastewater treatment plants (WWTP) in Sweden were analyzed for the presence of organic pollutants by gas chromatog.-mass spectrometry. From a total of 137 identified compounds, only 10 were priority pollutants. A broad spectrum of non-regulated organic pollutants in the effluent included aromatic hydrocarbons, food- and household-related compounds, solvents, plasticizers, flame retardants, preservatives, anti-oxidants, and washing- and cleaning-related compounds Individual effluent compound concentrations of all 3 WWTP were 0.5-50 娓璯/L. Few point-discharged pollutants from specific industries were present in the effluent. The majority of pollutants detected in effluent were attributable to overall use and discharge of chem. products. These pollutants originate from diffuse sources and represent a background chem. pollution load to the receiving waters through the discharge from WWTP in large cities. In the experiment, the researchers used many compounds, for example, 1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol (cas: 20324-33-8Category: ethers-buliding-blocks).

1-((1-((1-Methoxypropan-2-yl)oxy)propan-2-yl)oxy)propan-2-ol (cas: 20324-33-8) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil. Ethers feature bent C閳ユ彊閳ユ弲 linkages. In dimethyl ether, the bond angle is 111鎺?and C閳ユ彊 distances are 141 pm. The barrier to rotation about the C閳ユ彊 bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Category: ethers-buliding-blocks

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

Design, synthesis, and antitumor activity evaluation of novel acyl sulfonamide spirodienones was written by Chen, Chen;Luo, Yang;Yin, Honglu;Zhong, Qiu;Zheng, Shilong;Liu, Rui;Zhao, Chong;Wang, Guangdi;He, Ling. And the article was included in Bioorganic & Medicinal Chemistry in 2022.HPLC of Formula: 1877-75-4 This article mentions the following:

Based on the promising results of benzenesulfonamide spirodienones as antineoplastic agents, a series of novel acyl sulfonamide spirodienones I [R = Me, C₆H₅, 4-MeC₆H₄, etc.; R¹ = H, Me] were designed and synthesized for antineoplastic evaluation. Of these, compound I [R = 4-MeC₆H₄, R¹ = H] exhibited remarkable in-vitro antiproliferative activity by arresting the cell cycle and inducing apoptosis of MDA-MB-231 cells. Acute toxicity study demonstrated that compound I [R = 4-MeC₆H₄, R¹ = H] at 100 mg/kg dose caused no obvious toxicity to the major organs of mice. Moreover, compound I [R = 4-MeC₆H₄, R¹ = H] suppressed the growth of murine 4T1 tumor in-vivo. Preliminary enzyme assay showed that I [R = 4-MeC₆H₄, R¹ = H] was a potential MMP2 inhibitor for cancer therapy. In all, these results indicated that compound I [R = 4-MeC₆H₄, R¹ = H] may be a lead compound for the development of anticancer agents. In the experiment, the researchers used many compounds, for example, 2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4HPLC of Formula: 1877-75-4).

2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. At room temperature, ethers are pleasant-smelling colourless liquids. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil.HPLC of Formula: 1877-75-4

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

Conductometric, spectrophotometric, ¹HNMR and quantum chemical studies of the thermodynamics complexation of some transition metal ions with aza-15-crown-5 ligands in acetonitrile solution was written by Payehghadr, Mahmood;Nourifard, Farzaneh;Taghdiri, Mehdi;Behjatmanesh-Ardakani, Reza. And the article was included in Inorganic Chemistry: An Indian Journal in 2012.Quality Control of 1,4,7,10-Tetraoxa-13-azacyclopentadecane This article mentions the following:

In this paper, the complexation reactions between aza-15-crown-5 (A15C5) ligand with Zn²⁺, Hg²⁺, Co²⁺, Ag⁺ and Cd²⁺ ions has been studied by conductometric and spectrophotometric methods in acetonitrile solution at various temperatures The formation constants of the resulting 1:1 complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures At 25鎺矯, the order of stability of the 1:1 complexes of the A15C5 ligand with different cations are as Hg²⁺> Co²⁺> Cd²⁺> Zn²⁺> Ag⁺. The enthalpy and entropy changes of the complexation reactions were evaluated from the temperature dependence of formation constants In addition, ¹HNMR study of complexes of nitrate salt of Cd⁺² in acetonitrile with A15C5 ligand at 25鎺矯 has been also undertaken to compare the results with those obtained by conductivity and UV measurements, which have been found to be in good agreement with each other. Finally, ab initio studies of the level of HF/lanl2dz have been done to investigate the binding energies of the ligand with Ag⁺ and Hg²⁺. All theor. data are in line with the exptl. ones. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Quality Control of 1,4,7,10-Tetraoxa-13-azacyclopentadecane).

1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. The oxygen atom in ethers are more electronegative than carbon, thus the hydrogens which are alpha to the ethers are more acidic than the simple hydrocarbons. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O閳ユ椊 or N閳ユ椊 bonds. The ability to form hydrogen bonds with other compounds makes ethers particularly good solvents for a wide variety of organic compounds and a surprisingly large number of inorganic compounds.Quality Control of 1,4,7,10-Tetraoxa-13-azacyclopentadecane

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

Silver-containing microemulsion as a high-efficient and recyclable catalytic system for hydration of alkynes was written by Dong, Qizhi;Li, Ningbo;Qiu, Renhua;Wang, Jinying;Guo, Cancheng;Xu, Xinhua. And the article was included in Journal of Organometallic Chemistry in 2015.Safety of 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene This article mentions the following:

A silver-catalyzed highly efficient and regioselective synthesis of ketones from a wide range of alkynes is described. The reaction is dramatically accelerated by its performance in aqueous emulsion, which is self-assembled by the addition of silver perfluorooctanesulfonate and perfluorooctanesulfonic acid (PFOS) to water. The reaction is conducted under convenient conditions with broad substrate scope, including a variety of aromatic and aliphatic terminal alkynes and internal alkynes. Furthermore, the air- and light-stable silver catalytic microemulsion can be reused for 4 times with minimal change in catalytic efficiency. In the experiment, the researchers used many compounds, for example, 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1Safety of 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene).

1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. Ethers feature bent C閳ユ彊閳ユ弲 linkages. In dimethyl ether, the bond angle is 111鎺?and C閳ユ彊 distances are 141 pm. The barrier to rotation about the C閳ユ彊 bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Safety of 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene

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

Analytical pyrolysis of lignin: products stemming from 灏?5 substructures was written by Kuroda, Ken-ichi;Nakagawa-Izumi, Akiko. And the article was included in Organic Geochemistry in 2006.Related Products of 3929-47-3 This article mentions the following:

Five phenolic 2-arylcoumarans containing a 灏?5 linkage: I (R = CH₂OH, R’ = CH:CHCH₂OH) (II), I (R = CH₂OH, R’ = CH:CHCHO) (III), I (R = Me, R’ = CH:CHCH₂OH) (IV), I (R = Me, R’ = CH:CHCHO) (V), I (R = Me, R’ = CH:CHMe) (VI), and diazomethane-methylated II (VII), were pyrolyzed at 500鎺?for 4 s. The products were analyzed by gas chromatog. and gas chromatog./mass spectrometry. The major products of II–V and VII were 4-methylguaiacol (VIII) and 1,2-dimethoxy-4-methylbenzene, resp., stemming from the A moiety of the 2-arylcoumarans. I–V having the ring B with a CH:CHCH₂OH or CH:CHCHO side chain provided VIII in a larger yield than dehydrodiisoeugenol VI having the ring B with a CH=CHCH₃ side chain; the yields of 4 were 閳?.6, 5.7-4.6, and 0.9 mol% from II, III–V and VI, resp. Characterization of the dimeric products of II showed the 浼?aryl ether opened-dimers with the hydrogenated C浼?C灏?bond being the precursors of VIII. Based on these results, guaiacyl and syringyl 灏?5 substructures were proposed as potential pyrolytic origins for VIII and 3,5-dimethoxy-4-methylphenol in anal. pyrolysis of soft- and hardwood lignins. In the experiment, the researchers used many compounds, for example, 3-(3,4-Dimethoxyphenyl)propan-1-ol (cas: 3929-47-3Related Products of 3929-47-3).

3-(3,4-Dimethoxyphenyl)propan-1-ol (cas: 3929-47-3) belongs to ethers. The oxygen atom in ethers are more electronegative than carbon, thus the hydrogens which are alpha to the ethers are more acidic than the simple hydrocarbons. Electron-deficient reagents are also stabilized by ethers. For example, borane (BH3) is a useful reagent for making alcohols. Pure borane exists as its dimer, diborane (B2H6), a toxic gas that is inconvenient and hazardous to use. Borane forms stable complexes with ethers, however, and it is often supplied and used as its liquid complex with tetrahydrofuran (THF).Related Products of 3929-47-3

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

Divergent synthesis and biological evaluation of 2-(trifluoromethyl)pyridines as virulence-attenuating inverse agonists targeting PqsR was written by Schuetz, Christian;Hodzic, Amir;Hamed, Mostafa;Abdelsamie, Ahmed S.;Kany, Andreas M.;Bauer, Maximilian;Roehrig, Teresa;Schmelz, Stefan;Scrima, Andrea;Blankenfeldt, Wulf;Empting, Martin. And the article was included in European Journal of Medicinal Chemistry in 2021.Reference of 75581-11-2 This article mentions the following:

A short and divergent route towards new derivatives of 2-(trifluoromethyl)pyridines as potent inverse agonists of the bacterial target PqsR against Pseudomonas aeruginosa (PA) infections was described. This Gram-neg. pathogen causes severe nosocomial infections and common antibiotic treatment options were rendered ineffective due to resistance issues. Based on an earlier identified optimized hit, the derivatization and rigidification attempts employing two central building blocks were conducted. The western part of the mol. was built up via a 2-(trifluoromethyl)pyridine head group equipped with a terminal alkyne. The eastern section was then introduced through aryliode motifs exploiting Sonogashira as well as Suzuki-type chem. Subsequent modification provided quick access to an array of compounds, allowed for deep SAR insights, and enabled to optimize the hit scaffold into a lead structure of nanomolar potency combined with favorable in vitro ADME/T features. In the experiment, the researchers used many compounds, for example, 4-Iodo-1-methoxy-2-methylbenzene (cas: 75581-11-2Reference of 75581-11-2).

4-Iodo-1-methoxy-2-methylbenzene (cas: 75581-11-2) belongs to ethers. Ethers are good solvents partly because they are not very reactive. Most ethers can be cleaved, however, by hydrobromic acid (HBr) to give alkyl bromides or by hydroiodic acid (HI) to give alkyl iodides. Electron-deficient reagents are also stabilized by ethers. For example, borane (BH3) is a useful reagent for making alcohols. Pure borane exists as its dimer, diborane (B2H6), a toxic gas that is inconvenient and hazardous to use. Borane forms stable complexes with ethers, however, and it is often supplied and used as its liquid complex with tetrahydrofuran (THF).Reference of 75581-11-2

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