Month: February 2023

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

Phytochemical profiling of Coryphantha macromeris (cactaceae) growing in greenhouse conditions using ultra-high-performance liquid chromatography-tandem mass spectrometry was written by Cabanas-Garcia, Emmanuel;Areche, Carlos;Jauregui-Rincon, Juan;Cruz-Sosa, Francisco;Balch, Eugenio Perez-Molphe. And the article was included in Molecules in 2019.SDS of cas: 106-79-6 This article mentions the following:

Chromatog. separationcombined with mass spectrometry is a powerful tool for the characterization of plant metabolites because of its high sensitivity and selectivity. In this work, the phytochem.profile of aerial and radicular parts of Coryphantha macromeris (Engelm.) Britton & Rose growing under greenhouse conditions was qual.investigated for the first time by means of modern ultra-high-performance liquid chromatog. tandem mass spectrometry (UHPLC-PDA-HESI-Orbitrap-MS/MS). The UHPLC-PDA-HESI-Orbitrap-MS/MS anal. indicated a high complexity in phenolic metabolites. In our investigation, 69 compounds were detected and 60 of them were identified. Among detected compounds, several phenolic acids, phenolic glycosides, and organic acids were found. Within this diversity, 26 metabolites were exclusively detected in the aerial part, and 19 in the roots. Twenty-four metabolites occurred in both plant parts. According to the relative abundance of peaks in the chromatogram, ferulic and piscidic acids and their derivatives may correspond to one of the main phenolic compounds of C.macromeris. Our results contribute to the phytochem.knowledge regarding C.macromeris and its potential applications in the pharmaceutical and cosmetic industries. Besides, some metabolites and their fragmentation patterns are reported here for the first time for cacti species. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6SDS of cas: 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. SDS of cas: 106-79-6

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

Analogs of capsaicin with agonist activity as novel analgesic agents; structure-activity studies. 3. The hydrophobic side-chain “C-region” was written by Walpole, Christopher S. J.;Wrigglesworth, Roger;Bevan, Stuart;Campbell, Elizabeth A.;Dray, Andy;James, Iain F.;Masdin, Kay J.;Perkins, Martin N.;Winter, Janet. And the article was included in Journal of Medicinal Chemistry in 1993.Safety of 12-Methoxy-12-oxododecanoic acid This article mentions the following:

Structural variants of the hydrophobic side chain (C region) of the capsaicin mol. have been incorporated into a series of vanillylamides and vanillylthioureas. These compounds have been tested in an in vitro assay for agonism (⁴⁵Ca²⁺ influx into dorsal root ganglia neurons), previously shown to be predictive of analgesic activity. The results of this study have established the requirement for a hydrophobic substituent of limited size (molar refractivity, MR, <55) in order to obtain high potency. Combination of the information about the C-region of the capsaicin mol. with studies of the other parts of the mol. provides a rational basis for the design of compounds of increased potency. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Safety of 12-Methoxy-12-oxododecanoic acid).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) 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. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Safety of 12-Methoxy-12-oxododecanoic acid

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

The carboxyl group. Infrared absorption and ionization was written by Peltier, Daniel;Pichevin, Annick. And the article was included in Bulletin de la Societe Chimique de France in 1960.Application of 81245-24-1 This article mentions the following:

PK, ν_OH(monomeric), and ν_C:O (monomeric and dimeric) values of 17 substituted benzoic, 34 o-toluic, 17 m-toluic, and 12 p-toluic acids, as well as the ν_C:O values of 55 Me and Et esters were tabulated. For all the acids except the 6-substituted o-toluic acids (6-NO₂, I, Br, Cl, OH, NH₂), ν_OH (cm.^-1) = 3498 + 9pK. The ν_C:O (monomeric) of the o-OH and o-NH₂ acids were on the average 55 cm.^-1 lower and those of nonchelated, 6-substituted o-toluic acids were approx. 5 cm.^-1 higher than calculated from the appropriate equations (CA 53, 17954e). For acids free of chelation and steric effects, ν_OH = 5,028 – 0.857 ν_C:O (monomeric) (cm.^-1). For 3-, 4-, and 5-substituted o-toluic acids, ν_OH = 5053 – 0.874 ν_C:O. The carbonyl frequencies of the Et esters were approx. 5 cm.^-1 lower than those of the corresponding Me esters. These results are explained by electronic effects of H or alkyl group on the carbonyl group. 6-HO(or H₂N)-2-MeC₆H₃CO₂Me exhibited 2 carbonyl frequencies related to chelated and nonchelated forms. Similar data were presented for 2,3- (I), 2,4-, and 2,6-(MeO)MeC₆H₃CO₂H, and o-MeOC₆H₄CO₂H. The dimeric carbonyl absorptions were weak, the ν_OH were lower, and the ν_C:O were higher, based on the relations with pK, than expected for nonchelated acids. I was exceptional, as it gave a strong dimeric carbonyl absorption. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Application of 81245-24-1).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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. 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.Application of 81245-24-1

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

Facile synthesis of δ-ketoesters via formal two-carbon insertion into β-ketoesters was written by Jiang, Yan;Xi, Song;Wang, Qi;Fu, Lin;He, Ling;Wang, Zhen;Zhang, Min. And the article was included in Tetrahedron Letters in 2022.Category: esters-buliding-blocks This article mentions the following:

A formal two-carbon insertion into β-ketoesters with vinylmetal has been developed for the rapid synthesis of δ-ketoesters. This method features high efficiency, simple operation, and mild conditions without the usage of bases and catalysts. The reaction is postulated to proceed via a tandem process in volving nucleophilic addition of vinylmetal to ketone, retro-aldol reaction to give an enolate anion and an enone, and finally Michael addition of these two intermediates. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Category: esters-buliding-blocks).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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.Category: esters-buliding-blocks

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

Volatile components of Borassus aethiopum was written by Mahmout, Yaya;Mbaiguinam, Mbailao;Bessiere, Jean-Marie. And the article was included in Journal de la Societe Ouest-Africaine de Chimie in 2001.Recommanded Product: Ethyl 2-hydroxy-3-phenylpropanoate This article mentions the following:

The essential oil and the methylene chloride extract of the pulp of B. aethiopum of Chad were analyzed. The essential yield of the samples was 0.5-0.7%, while methylene chloride extracts gave 1.3% of the residue. The essential oil was characterized by (E)-Et cinnamate and geranylacetone (10.5%) with lesser amounts of 3-phenylpropanol (8.6%) and farnesylacetone (5%). The other main esters were Et 3-hydroxybutanoate (3.4%), Et 3-phenylpropanoate (2.7%), Et benzoate (1.7%), (E)-Me cinnamate (0.8%), Et 3-hydroxyisohexanoate (0.6%) and phenylethyl tiglate (0.6%). The richness of ester compounds may have contributed significantly to the pleasant odor of the ripe fruits of B. aethiopum. The presence of (E)-Et cinnamate in the oil of B. aethiopum was the most major difference noticed on comparison of the essential oil of samples from Sudan. Most of the identified components were not previously known to be present in the volatile extracts of B. aethiopum. These compositional differences may be chemotaxonomically significant. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Recommanded Product: Ethyl 2-hydroxy-3-phenylpropanoate).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Recommanded Product: Ethyl 2-hydroxy-3-phenylpropanoate

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

Highly efficient [2 + 2] intramolecular cyclizations of allenynes under microwave irradiation: construction of fused bicyclic compounds was written by Oh, Chang Ho;Gupta, Arun Kumar;Park, Dai In;Kim, Nakjoong. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2005.Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate This article mentions the following:

A palladium [2 + 2] cycloaddition of 1,6- and 1,7- allenyne carboxylates and microwave-mediated [2 + 2] cycloaddition of various 1,n-allenynes were developed and, particularly, the microwave irradiated [2 + 2] cycloaddition of allenynes can provide a simple, general and eco-friendly synthetic method to fused bicyclo[m,2,0]alkadienes. E.g., microwave irradiation of allenyne CH₂:C:CHCH₂N(Ts)CH₂CCCO₂Et gave 89% bicyclo[m,2,0]alkadiene I. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate

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

Insights into Mechanical, Thermal, and Electrical Properties of Peroxide-Cured Chlorinated Polyethylene/Ethylene Methacrylate Copolymer Blend Vulcanizates was written by Bhagabati, Purabi;Murugesan, Selvakumar. And the article was included in ACS Omega in 2021.Synthetic Route of C73H108O12 This article mentions the following:

This work unveils the effect of chem. modification of compatible elastomer blends based on the chlorinated polyethylene (CPE) and ethylene methacrylate copolymer (EMA) (60:40 ratio) using dicumyl peroxide (DCP). CPE/EMA blend vulcanizates were prepared by varying the DCP concentration from 0.5 to 3.0 wt %. All blend vulcanizates showed significant enhancement in physiomech. properties and thermal stability upon increasing the DCP concentration DCP incorporation also enhanced the compatibility between CPE and EMA rubbers, which was revealed from FTIR data and other tech. properties. Specifically, the vulcanizates with 1.5 wt % DCP showed an enormous improvement in mech. properties and glass transition temperature (T_g) due to various reasons such as cure characteristics, crosslinking densities, co-crosslinking systems, and morphol. features. Uniform distribution of DCP in both the elastomeric phases across their interphases caused co-crosslinking, which increased interphase adhesion in the blend vulcanizates. High interphase adhesion of the blend vulcanizates of 1.5 wt % DCP was directly reflected in its improved mech., thermal, flame retardation properties and enhanced oil resistance and volume resistivity in comparison to pristine CPE/EMA blend vulcanizates. Also, the volume resistivity and oil resistance properties of blend vulcanizates were found to be marginally improved upon increasing the concentration of DCP. In the experiment, the researchers used many compounds, for example, 2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8Synthetic Route of C73H108O12).

2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8) 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.Synthetic Route of C73H108O12

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