Category: ethers-buliding-blocks

Cation enhanced trans-cis photoisomerization in lariat azacrown ethers was written by Kumar, Perepogu Arun;Srinivas, Uppalanchi;Rao, V. Jayathirtha. And the article was included in Current Organic Chemistry in 2010.HPLC of Formula: 66943-05-3 This article mentions the following:

The authors describe the synthesis and effect of complexation on photochem. E (trans) to Z (cis) isomerization of lariat azacrown ethers. Lariat azacrown ethers-Ca²⁺ complexes are characterized by UV-visible, ¹H-NMR and fluorescence techniques. Photostationary state composition of E-Z isomers upon irradiation under direct excitation and complexation with Ca(ClO₄)₂, quantum yield of photoisomerization, and fluorescence properties are described. Anomalous increase in the quantum yields were observed for lariat azacrown ether-Ca²⁺ complexes. Fluorescence studies indicated that the highly polarized/charge transfer nature of the singlet excited state is involved in E (trans) to Z (cis) isomerization process. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3HPLC of Formula: 66943-05-3).

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 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.HPLC of Formula: 66943-05-3

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

Effects of Electrolytes on Thermodynamics and Structure of Oligo(ethylene oxide)/Salt Solutions and Liquid-Liquid Equilibria of a Squalane/Tetraethylene Glycol Dimethyl Ether Blend was written by Shen, Zhengyuan;Chen, Qile P.;Xie, Shuyi;Lodge, Timothy P.;Siepmann, J. Ilja. And the article was included in Macromolecules (Washington, DC, United States) in 2021.Synthetic Route of C8H18O4 This article mentions the following:

Gibbs ensemble Monte Carlo simulations for salt-doped oligo(ethylene oxide) (OEO, M_w = 90-266 g/mol) solutions show that the presence of ions leads to significant increases in the cohesive energy d. (Π_CED) and the enthalpy of vaporization for OEO chains but that compensation by entropic contributions leads to only small changes in the Gibbs free energy of transfer and vapor pressure. At the same relative ion concentration (r) and temperature, the Π_CED values of the salt-doped systems order as LiClO₄ > LiF > CsClO₄ ≈ CsF. Structural anal. indicates significant ion clustering in addition to coordination of cations by OEO chains. After accounting for ion clustering via the van’t Hoff factor, the solvents’ vapor pressures are well described by Raoult’s law. Experiments and simulations for a squalane/tetraethylene glycol di-Me ether blend (x_W,OEO = 0.65) show that the addition of LiClO₄ does not significantly alter the miscibility gap below 0.95 T_CP,free, the critical temperature of the salt-free blend. However, the coexistence curve for the LiClO₄-doped system does not close with the usual power-law scaling at T > 0.95 T_CP,free as transfer of OEO chains to the squalane-rich phase leads to an increase in r in the OEO-rich phase, which, in turn, makes it a less hospitable environment for squalane. In the experiment, the researchers used many compounds, for example, 2,5,8,11-Tetraoxadodecane (cas: 112-49-2Synthetic Route of C8H18O4).

2,5,8,11-Tetraoxadodecane (cas: 112-49-2) 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. But on the other hand, ethers undergo cleavage by reaction with acids. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H 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.Synthetic Route of C8H18O4

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

Electrochemical esterification reaction of alkynes with diols via cleavage of carbon-carbon triple bonds without catalyst and oxidant was written by Wang, Pei-Long;Shen, Hui-Zhi;Cheng, Hui-Hui;Gao, Hui;Li, Pin-Hua. And the article was included in Green Chemistry in 2020.COA of Formula: C5H12O3 This article mentions the following:

A novel electrochem. esterification of alkynes for the synthesis of aryl esters I [R = (CH₂)₂OH, (CH₂)₃OH, (CH₂)₄OH, etc.; R¹ = H, 2-Cl, 4-Me, etc.] was developed in which diols and their derivatives were used as the partners. This method was green as it was catalyst-free, oxidant-free and additive-free and showed atom-economy. This was the first example of an electrochem. reaction via cleavage of carbon-carbon triple bonds. In the experiment, the researchers used many compounds, for example, 2-(2-Methoxyethoxy)ethanol (cas: 111-77-3COA of Formula: C5H12O3).

2-(2-Methoxyethoxy)ethanol (cas: 111-77-3) 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. 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: C5H12O3

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

Nano-CuI catalyzed cross-coupling reaction of phenols with nitroarenes was written by Xu, Xiaolan;Feng, Teng;He, Jianbo;Xu, Huajian. And the article was included in Youji Huaxue in 2016.COA of Formula: C15H14O3 This article mentions the following:

A general and efficient method for the synthesis of diaryl ethers, e. g., I, via nano-CuI catalyzed coupling reaction of phenols with nitroarenes was developed. The efficiency of this reaction was demonstrated by its compatibility with a range of functional groups in good to excellent yields. The catalyst could be recycled for three times without significant loss of the catalytic activity. In the experiment, the researchers used many compounds, for example, 1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8COA of Formula: C15H14O3).

1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8) 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. 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: C15H14O3

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

Self-Assembly of Janus Dendrimers into Uniform Dendrimersomes and Other Complex Architectures was written by Percec, Virgil;Wilson, Daniela A.;Leowanawat, Pawaret;Wilson, Christopher J.;Hughes, Andrew D.;Kaucher, Mark S.;Hammer, Daniel A.;Levine, Dalia H.;Kim, Anthony J.;Bates, Frank S.;Davis, Kevin P.;Lodge, Timothy P.;Klein, Michael L.;De Vane, Russell H.;Aqad, Emad;Rosen, Brad M.;Argintaru, Andreea O.;Sienkowska, Monika J.;Rissanen, Kari;Nummelin, Sami;Ropponen, Jarmo. And the article was included in Science (Washington, DC, United States) in 2010.Reference of 60221-37-6 This article mentions the following:

Self-assembled nanostructures obtained from natural and synthetic amphiphiles serve as mimics of biol. membranes and enable the delivery of drugs, proteins, genes, and imaging agents. Yet the precise mol. arrangements demanded by these functions are difficult to achieve. Libraries of amphiphilic Janus dendrimers, prepared by facile coupling of tailored hydrophilic and hydrophobic branched segments, have been screened by cryogenic transmission electron microscopy, revealing a rich palette of morphologies in water, including vesicles, denoted dendrimersomes, cubosomes, disks, tubular vesicles, and helical ribbons. Dendrimersomes marry the stability and mech. strength obtainable from polymersomes with the biol. function of stabilized phospholipid liposomes, plus superior uniformity of size, ease of formation, and chem. functionalization. This modular synthesis strategy provides access to systematic tuning of mol. structure and of self-assembled architecture. In the experiment, the researchers used many compounds, for example, 2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol (cas: 60221-37-6Reference of 60221-37-6).

2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol (cas: 60221-37-6) 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. But on the other hand, ethers undergo cleavage by reaction with acids. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Reference of 60221-37-6

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

Palladium-catalyzed amination in the synthesis of aza- and diazacrown trismacrocyclic compounds was written by Yakushev, A. A.;Anokhin, M. V.;Averin, A. D.;Maloshitskaya, O. A.;Beletskaya, I. P.. And the article was included in Russian Chemical Bulletin in 2012.Product Details of 66943-05-3 This article mentions the following:

Palladium-catalyzed C-N-cross-coupling of N,N’-bis(bromobenzyl) diazacrown compounds with two equivalent of 1-aza-15-crown-5 and 1-aza-18-crown-6 ethers furnished trismacrocyclic compounds with isolated macrocycles. Macrotricyclic cryptands were obtained when diazacrown ethers were used as N-components. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Product Details of 66943-05-3).

1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) 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. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Product Details of 66943-05-3

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

Cinnamides as selective small-molecule inhibitors of a cellular model of breast cancer stem cells was written by Germain, Andrew R.;Carmody, Leigh C.;Nag, Partha P.;Morgan, Barbara;VerPlank, Lynn;Fernandez, Cristina;Donckele, Etienne;Feng, Yuxiong;Perez, Jose R.;Dandapani, Sivaraman;Palmer, Michelle;Lander, Eric S.;Gupta, Piyush B.;Schreiber, Stuart L.;Munoz, Benito. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2013.Synthetic Route of C11H12O4 This article mentions the following:

A high-throughput screen (HTS) was conducted against stably propagated cancer stem cell (CSC)-enriched populations using a library of 300,718 compounds from the National Institutes of Health (NIH) Mol. Libraries Small Mol. Repository (MLSMR). A cinnamide analog displayed greater than 20-fold selective inhibition of the breast CSC-like cell line (HMLE_sh_Ecad) over the isogenic control cell line (HMLE_sh_eGFP). Herein, we report structure-activity relationships of this class of cinnamides for selective lethality towards CSC-enriched populations. In the experiment, the researchers used many compounds, for example, 3-(2,4-Dimethoxyphenyl)acrylic acid (cas: 6972-61-8Synthetic Route of C11H12O4).

3-(2,4-Dimethoxyphenyl)acrylic acid (cas: 6972-61-8) 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. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Synthetic Route of C11H12O4

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

Arabinogalactan propargyl ethers: Au-catalysed hydroamination by imidazols was written by Grishchenko, Lyudmila A.;Parshina, Lidiya N.;Larina, Lyudmila I.;Belovezhets, Lyudmila A.;Klimenkov, Igor V.;Ustinov, Alexander Yu.;Trofimov, Boris A.. And the article was included in Carbohydrate Polymers in 2020.HPLC of Formula: 111-77-3 This article mentions the following:

A method for synthesis of pharmacol. prospective arabinogalactan (AG) imidazole- and benzimidazole derivatives in a yield of up to 97% via Au(III)-catalyzed hydroamination of AG propargyl ethers has been developed. It is found that in the presence of 5 mol% HAuC1₄ and 10-fold excess imidazole relative to the propargyl groups, the hydroamination successfully competes with crosslinking processes to afford products soluble in DMSO and aqueous HCl solutions (degree of substitution of imidazolylpropenyl fragments 0.5-1.8, yield 62-97%). It is established that under the conditions of hydroamination Au(III) is reduced to give mainly Au(0) and minor amounts of Au(I), which are contained in AG imidazole derivatives as particles of 190-640 nm in size. Hydrochlorides of Au-containing AG imidazole derivatives show high bacteriostatic activity with respect to test gram-pos. microorganisms and thus confirming their prospects as new AG-derived bioactive agents. In the experiment, the researchers used many compounds, for example, 2-(2-Methoxyethoxy)ethanol (cas: 111-77-3HPLC of Formula: 111-77-3).

2-(2-Methoxyethoxy)ethanol (cas: 111-77-3) 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 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.HPLC of Formula: 111-77-3

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

Silica gel-assisted reductive cyclization of 2-nitro-β-piperidinostyrenes, derived from 2-nitrotoluenes, to indoles was written by Kawase, Masami;Sinhababu, Achintya K.;Borchardt, Ronald T.. And the article was included in Journal of Heterocyclic Chemistry in 1987.Electric Literature of C8H9NO3 This article mentions the following:

Condensation reaction of nitrotoluenes I (R = H, F, OMe, OCH₂Ph; R¹ = H, MeO, PhCH₂O; R² = H, Cl, PhCH₂O) with tripiperidinomethane, followed by reductive intramol. cyclocondensation of the product nitropiperidinostyrenes II with Fe-silica gel gave 62-94% indoles III. In the experiment, the researchers used many compounds, for example, 3-Methyl-4-nitroanisole (cas: 5367-32-8Electric Literature of C8H9NO3).

3-Methyl-4-nitroanisole (cas: 5367-32-8) 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. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H 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.Electric Literature of C8H9NO3

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

Recyclization to 1-pyrazol-3-yl-1H-benzimidazoles in the reaction of 2-phenacyl-1H-benzimidazole hydrazone with carboxylic acids was written by Dzvinchuk, I. B.;Vypirailenko, A. V.;Lozinskii, M. O.. And the article was included in Ukrainskii Khimicheskii Zhurnal (Russian Edition) in 1999.Synthetic Route of C9H10O4 This article mentions the following:

Reaction of 2-phenacyl-1H-benzimidazole hydrazone (I) with RCOOH (R = H, Me, PhCH₂, 2-thienylmethyl, aryloxymethyl) at 150-200° gave 1-pyrazol-3-yl-1H-benzimidazoles (II). In the experiment, the researchers used many compounds, for example, 2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4Synthetic Route of C9H10O4).

2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4) 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. But on the other hand, ethers undergo cleavage by reaction with acids. 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.Synthetic Route of C9H10O4

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