Tag: 200-300

Selective monomethyl esterification of dicarboxylic acids by use of monocarboxylate chemisorption on alumina was written by Ogawa, Haruo;Chihara, Teiji;Taya, Kazuo. And the article was included in Journal of the American Chemical Society in 1985.HPLC of Formula: 3903-40-0 This article mentions the following:

The application of alumina as a solid support affords a new procedure for selective monoesterification of dicarboxylic acids. Thus, terephthalic acid (I), isophthalic acid, cis– and trans-1,4-cyclohexanedicarboxylic acids, and aliphatic dicarboxylic acids give the corresponding monomethyl esters quant. with diazomethane. Selective monomethyl esterification of phthalic acid is not successful on alumina, probably as a consequence of the close proximity of the two carboxyl groups and the forced orientation of the second group when one is adsorbed. Me₂SO₄ and p-MeC₆H₄N:NNHMe were also effective for the selective monomethyl esterification of I by this procedure. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0HPLC of Formula: 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.HPLC of Formula: 3903-40-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Novel solid-state mercury(II)-selective electrode based on symmetrical sulfur-containing carrier was written by Kermani, Seyed Mohammad Javad Majdzadeh;Ghanei-Motlagh, Masoud;Zhiani, Rahele;Taher, Mohammad Ali;Fayazi, Maryam;Razavipanah, Iman. And the article was included in Journal of Molecular Liquids in 2015.Category: esters-buliding-blocks This article mentions the following:

A new mercury solid-state ion-selective electrode has been prepared by directly coating the surface of a platinum disk electrode with THF (THF) solution containing poly(vinyl chloride) (PVC), 1,2-bis(quinolin-8-ylsulfanylmethyl)benzene (BQSB), dioctyl phthalate (DOP) and potassium tetrakis(p-chlorophenyl)borate (KTpClPB). The electrode exhibits a Nerstian response in the range of 1.0 × 10^-7-1.0 × 10^-2 M with a detection limit and slope of 8.0 × 10^-8 M and 29.7 ± 0.3 mV/decade resp. The response time to achieve a 95% steady potential for Hg²⁺ concentration ranging from 1 × 10^-5 to 1 × 10^-2 M is ∼15 s, and the electrode is suitable for use within the pH range of 1.7-4.0. The proposed electrode revealed fairly good discrimination ability towards Hg⁺² in comparison to some alkali, alk. earth, transition and heavy metal ions. Applications of this electrode for the determination of mercury in environmental waters, and as an indicator electrode for potentiometric titration of Hg⁺² ions with iodide, were reported. It could be applied for the determination of mercury in environmental waters. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Category: esters-buliding-blocks).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Atroposelective Phosphoric Acid Catalyzed Three-Component Cascade Reaction: Enantioselective Synthesis of Axially Chiral N-Arylindoles was written by Wang, Lei;Zhong, Jialing;Lin, Xufeng. And the article was included in Angewandte Chemie, International Edition in 2019.Application of 33166-79-9 This article mentions the following:

An efficient organocatalytic atroposelective three-component cascade reaction of 2,3-diketoesters, aromatic amines, and 1,3-cyclohexanediones has been developed for the highly enantioselective synthesis of axially chiral N-arylindoles. The success of this method derives from the use of a newly developed second-generation chiral spirocyclic phosphoric acid as the catalyst. In addition, this protocol was extended to the synthesis of an axially chiral monophosphorus ligand. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Application of 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Application of 33166-79-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of aromatic azomethines by condensation of substituted benzaldehydes with 4-aminophenylene-N-imide of maleopimaric acid was written by Dikusar, E. A.;Bei, M. P.;Yuvchenko, A. P.;Potkin, V. I.. And the article was included in Russian Journal of General Chemistry in 2010.Quality Control of 4-Formyl-2-methoxyphenyl isobutyrate This article mentions the following:

The synthesis of aromatic azomethines, e.g., I by condensation of substituted benzaldehydes of vanillin series with 4-aminophenylene-N-imide of maleopimaric acid is presented. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Quality Control of 4-Formyl-2-methoxyphenyl isobutyrate).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Quality Control of 4-Formyl-2-methoxyphenyl isobutyrate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of diphenyl sulfides. V. Nitro group mobility in 4-nitrodiphenyl sulfide derivatives was written by Sevbo, D. P.;Stepanova, T. F.;Nekhoroshev, A. A.. And the article was included in Zhurnal Organicheskoi Khimii in 1980.COA of Formula: C9H9NO5 This article mentions the following:

5,4,2-BrCl(O₂N)C₆H₂O₂Et reacted with 2-O₂NC₆H₄SH (I) in DMF containing Et₃N to give 4,2,5-Cl(X)(2-O₂NC₆H₄S)C₆H₂CO₂Et (X = O₂N, 2-O₂NC₆H₄S). Analogous reaction of 5,2-Cl(O₂N)C₆H₃CO₂Me (II) gave 2,5-X(2-O₂NC₆H₄S)C₆H₃CO₂Me (same X), but II and PhSH gave only 2,5-(PhS)₂C₆H₃CO₂Me under these conditions. Similarly, 5,2,3-Br(O₂N)(MeO)C₆H₂CO₂Me and I gave only 3,2,5-MeO(2-O₂NC₆H₄S)₂C₆H₂CO₂Me. However, 2-O₂NC₆H₄R [R = CO₂Me, SC₆H₄NO₂-4, SC₆H₃(NO₂)Me-4,3, SC₆H₂(CO₂Me)(NO₂)NH₂-3,4,5] were inert to arylthiolates. Dinitro esters III (R = Me, R¹ = H, Me; R = CH₂Ph, R¹ = H; X = Br) reacted with I to give to corresponding III (X = 2-O₂NCH₄S) and disubstitution product IV in ≥9:1 ratio. IV (R = CH₂Ph, R¹ = H) were cleaved with refluxing CF₃CO₂H to give 77% IV (R = R¹ = H), which reacted with CH₂N₂ to give IV (R = R¹ = Me). The latter, also prepared by treating III (R = R¹ = Me; X = Br) with excess II, was hydrogenated over Raney Ni to give PhNH₂ and 2,5-X¹(MeO)C₆H₃CO₂Me (V; X¹ = H₂N) and then acetylated to give V (X¹ = AcNH), which was also prepared analogously from 2,5-O₂N(MeO)C₆H₃CO₂H. In the experiment, the researchers used many compounds, for example, Methyl 5-methoxy-2-nitrobenzoate (cas: 2327-45-9COA of Formula: C9H9NO5).

Methyl 5-methoxy-2-nitrobenzoate (cas: 2327-45-9) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.COA of Formula: C9H9NO5

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Regularities of the kinetics of miniemulsion polymerization of styrene in the presence of dithiobenzoates as reversible chain transfer agents was written by Serkhacheva, N. S.;Tolkachev, A. V.;Chernikova, E. V.;Prokopov, N. I.. And the article was included in Russian Chemical Bulletin in 2015.Formula: C14H12S2 This article mentions the following:

The results of comparative kinetic study of the miniemulsion controlled radical polymerization of styrene in the presence of reversible chain transfer agents (benzyl dithiobenzoate and polystyrene dithiobenzoate) and bulk polymerization of similar systems are presented. The influence of the reactant nature and dithiobenzoate concentration of the kinetics of the process is discussed. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Formula: C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Formula: C14H12S2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

One-pot synthesis of 3-amino-4-aryl- and 3-amino-4-hetarylfurazans was written by Sheremetev, A. B.. And the article was included in Russian Chemical Bulletin in 2005.Related Products of 33166-79-9 This article mentions the following:

A one-pot process involving hydrolysis of the corresponding ester of a β-aryl- or β-hetaryl-β-oxo acid, nitrosation at the activated methylene group, and treatment of the resulting intermediate with an alk. solution of hydroxylamine in the presence of urea, afforded the title compounds In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Related Products of 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Related Products of 33166-79-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Reversible addition-fragmentation chain transfer (RAFT) (Co)polymerization of isobornyl acrylate was written by Kulikov, E. E.;Zaitsev, S. D.;Semchikov, Yu. D.. And the article was included in Polymer Science, Series C in 2015.Recommanded Product: Benzyl benzodithioate This article mentions the following:

Controlled/living radical homopolymerization of isobornyl acrylate and its copolymerization with styrene with reversible chain transfer via the addition-fragmentation mechanism in the presence of benzyl dithiobenzoate have been studied. It has been shown that the (co)polymerization proceeds through living chains, a result that is confirmed by a linear increase in the number-average mol. weight with conversion and by low polydispersity indexes. With the use of polymer RAFT agents block copolymers have been synthesized. Amphiphilic copolymers have been obtained through acid hydrolysis of isobornyl acrylate units in copolymers of various microstructures. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Recommanded Product: Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Recommanded Product: Benzyl benzodithioate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of novel photoactive enkephalin-like peptides was written by Sumbatyan, N. V.;Topin, A. N.;Taranenko, M. V.;Korshunova, G. A.. And the article was included in Vestnik Moskovskogo Universiteta, Seriya 2: Khimiya in 2001.Recommanded Product: 133467-01-3 This article mentions the following:

Two new analogs of enkephalin containing photoactive residue of N-azide-L-phenylalanine and N-[3-(trifluoromethyl)-3H-diazirin-3-yl]-L-phenylalanine were synthesized. The photochem. property of prepared enkephalin derivatives and their ability to bind opioid receptors were studied. In the experiment, the researchers used many compounds, for example, Boc-D-Leu-OMe (cas: 133467-01-3Recommanded Product: 133467-01-3).

Boc-D-Leu-OMe (cas: 133467-01-3) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Recommanded Product: 133467-01-3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Iron Catalyzed Asymmetric Hydrogenation of Ketones was written by Li, Yanyun;Yu, Shenluan;Wu, Xiaofeng;Xiao, Jianliang;Shen, Weiyi;Dong, Zhenrong;Gao, Jingxing. And the article was included in Journal of the American Chemical Society in 2014.Safety of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

Chiral mols., such as alcs., are vital for the manufacturing of fine chems., pharmaceuticals, agrochems., fragrances, and novel materials. These mols. need to be produced in high yield and high optical purity and preferentially catalytically. Among all the asym. catalytic reactions, asym. hydrogenation with H₂ (AH) is the most widely used in the industry. With few exceptions, these AH processes use catalysts based on the three critical metals, rhodium, ruthenium, and iridium. Herein we describe a simple, industrially viable iron catalyst that allows for the AH of ketones, a process currently dominated by ruthenium and rhodium catalysts. By combining a chiral, 22-membered macrocyclic ligand with the cheap, readily available Fe₃(CO)₁₂, a wide variety of ketones have been hydrogenated under 50 bar H₂ at 45-65°, affording highly valuable chiral alcs. with enantioselectivities approaching or surpassing those obtained with the noble metal catalysts. In contrast to AH by most noble metal catalysts, the iron-catalyzed hydrogenation appears to be heterogeneous. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Safety of Ethyl 3-oxo-3-(m-tolyl)propanoate).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Safety of Ethyl 3-oxo-3-(m-tolyl)propanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics