Category: esters-buliding-blocks

An Immunoassay To Evaluate Human/Environmental Exposure to the Antimicrobial Triclocarban was written by Ahn, Ki Chang;Kasagami, Takeo;Tsai, Hsing-Ju;Schebb, Nils Helge;Ogunyoku, Temitope;Gee, Shirley J.;Young, Thomas M.;Hammock, Bruce D.. And the article was included in Environmental Science & Technology in 2012.Quality Control of Methyl 4-(4-aminophenyl)butanoate This article mentions the following:

A sensitive, competitive indirect ELISA for the detection of the antimicrobial triclocarban (TCC) was developed. The haptens were synthesized by derivatizing the para position of a Ph moiety of TCC. The rabbit antisera were screened and the combination of antiserum 1648 and a heterologous competitive hapten containing a piperidine was further characterized. The IC₅₀ and detection range for TCC in buffer were 0.70 and 0.13-3.60 ng/mL, resp. The assay was selective for TCC, providing only low cross-reactivity to TCC-related compounds and its major metabolites except for the closely related antimicrobial 3-trifluoromethyl-4,4′-dichlorocarbanilide. A liquid-liquid extraction for sample preparation of human body fluids resulted in an assay that measured low part per billion levels of TCC in small volumes of the samples. The limits of quantification of TCC were 5 ng/mL in blood/serum and 10 ng/mL in urine, resp. TCC in human urine was largely the N- or N’-glucuronide. TCC concentrations of biosolids measured by the ELISA were similar to those determined by LC-MS/MS. This immunoassay can be used as a rapid, inexpensive, and convenient tool to aid researchers monitoring human/environmental exposure to TCC to better understand the health effects. In the experiment, the researchers used many compounds, for example, Methyl 4-(4-aminophenyl)butanoate (cas: 20637-09-6Quality Control of Methyl 4-(4-aminophenyl)butanoate).

Methyl 4-(4-aminophenyl)butanoate (cas: 20637-09-6) 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. 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 Methyl 4-(4-aminophenyl)butanoate

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

Environmental implications from the priority pollutants screening in impoundment reservoir along the eastern route of China′s South-to-North Water Diversion Project was written by Zhao, Zhonghua;Gong, Xionghu;Ding, Qiqi;Jin, Miao;Wang, Zhaode;Lu, Shaoyong;Zhang, Lu. And the article was included in Science of the Total Environment in 2021.SDS of cas: 84-61-7 This article mentions the following:

Screening priority pollutants from vast anthropogenic contaminants discharged into aquatic environment is urgent for protecting water quality definitely. The multi-criteria scoring method involved in the occurrence (O), persistence (P), bioaccumulation (B), ecol. risk (Eco-T), and human health risk (Hum-T), was established for pollutants prioritization in waters and applied in Dongping Lake, the final impoundment reservoir along the eastern route of China′s South-to-North Water Diversion Project (SNWDP). A total of 170 chems. including heavy metals (HMs), volatile organic chems. (VOCs), polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), phthalate esters (PAEs), and antibiotics (ANTs) were investigated as the candidates. Accordingly, 42 chems. including 8 PAEs, 7 OCPs, 7 PCBs, 5 PAHs, 13 HMs, and 2 VOCs were made up the list of priority pollutants for Dongping Lake, suggesting the necessity of routine monitoring high priority groups and revising the existing list. Multiple risk assessment indicated higher ecol. and human health risks induced by HMs than by organic pollutants. Spatial distribution of risks stressed the retention of toxic organic chems. by the lake body and the accumulation of HMs along the transfer route, resp., thus triggering ecosystem responses and potential effects on the water-receiving areas as expected. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7SDS of cas: 84-61-7).

Dicyclohexyl phthalate (cas: 84-61-7) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.SDS of cas: 84-61-7

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

Trace analysis of multiple synthetic phenolic antioxidants in foods by liquid chromatography-tandem mass spectrometry with complementary use of electrospray ionization and atmospheric pressure chemical ionization was written by Du, Bibai;Shen, Mingjie;Pan, Zibin;Zhu, Chunyou;Luo, Dan;Zeng, Lixi. And the article was included in Food Chemistry in 2022.Name: 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) This article mentions the following:

This study presented a universal LC-MS/MS method for trace anal. of multiple synthetic phenolic antioxidants (SPAs) in foods by complementary use of electrospray ionization (ESI) and atm. pressure chem. ionization (APCI). The analytes included not only the well-known BHT and BHA but also 18 high mol. weight SPAs. The method utilized APCI to achieve sensitive anal. of BHT, Irganox 1010, Irganox 330, and Irganox 3125 based on the finding that APCI significantly improved the sensitivity of these weakly acidic or slightly polar SPAs, and utilized ESI to obtain sensitive anal. of other SPAs. Addnl., the method avoided background contamination by using effective measures including installation of a trapping column in the LC system. Method performance assessment showed satisfactory sensitivity, linearity, accuracy, and precision for anal. of SPAs in vegetable oil, milk powder, and baby fruit puree. Method application revealed widespread contamination of foods with BHT, Irganox 1010, and Irganox 1076. 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: 6683-19-8Name: 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)).

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 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. 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.Name: 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)

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

Synthesis, DNA binding, topoisomerases inhibition, and cytotoxic properties of 4-arylcarboxamidopyrrolo-2-carboxyanilides was written by Dudouit, Fabienne;Goossens, Jean-Francois;Houssin, Raymond;Henichart, Jean-Pierre;Colson, Pierre;Houssier, Claude;Gelus, Nathalie;Bailly, Christian. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2000.Application of 5930-92-7 This article mentions the following:

N-aryl-4-benzamidopyrrolecarboxamides I (R = H, Me, PhCH₂) were synthesized and evaluated for their capacities to bind to specific sequences within the minor groove of DNA and to inhibit human topoisomerases I and II in vitro. The cytotoxicity of the drugs correlates with their DNA binding affinities. Compounds I (R = Me, PhCH₂) stabilize topoisomerase I-DNA complexes. In the experiment, the researchers used many compounds, for example, Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7Application of 5930-92-7).

Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7) 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. 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. Application of 5930-92-7

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

Condensation of γ-chloro esters of methylcyclohexane with dialkyl malonates was written by Gadzhiev, M. M.;Alieva, F. Dzh.;Guseinova, R. A.;Aliev, S. A.;Mamedova, S. G.. And the article was included in Kimya Problemlari in 2008.Related Products of 1190-39-2 This article mentions the following:

New mixed esters on the basis of γ-chloro esters of 1-methylcyclohexane and dialkyl esters of malonic acid were synthesized. It was shown that newly synthesized compounds can be used as plasticizers for polyvinyl chloride linoleum for partial substitution of deficient dioctyl phthalate. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Related Products of 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) 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.Related Products of 1190-39-2

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

Group transfer reactions using N-aroylbenzotriazoles was written by Karnik, A. V.;Yasmeen, A. S. Kadiri. And the article was included in Indian Journal of Heterocyclic Chemistry in 2004.Computed Properties of C12H14O3 This article mentions the following:

N-Aroylbenzotriazoles (Ar = Ph, 3-MeC₆H₄, 2-ClC₆H₄, 3-O₂NC₆H₄) have been successfully used to transfer the aroyl group to the enolates of Et acetoacetate and acetylacetone. The intermediate products, namely Et aroylacetoacetate and aroylacetylacetone, undergo in situ hydrolysis to give the corresponding keto esters and β-diketones ArCOCH₂COR (R = Me, EtO). In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Computed Properties of C12H14O3).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) 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.Computed Properties of C12H14O3

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

Synthesis of di- and poly-substituted phenols via [4 + 2] type cyclo-condensation was written by Shao, Ming-Zhe;Liu, Xiao-Yu;Li, Fang-Qing;Chen, Zili. And the article was included in Tetrahedron Letters in 2021.Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate This article mentions the following:

A new [4 + 2] type cyclocondensation was developed to prepare 3,5- and poly-substituted phenols using aryl ketoesters and ynones as the starting materials; Various substrates, such as aryl-, heteroaryl ketoesters and aryl-, vinyl-, alkyl substituted ynones, were employed. In addition, extending the substrate scope to benzoyl acetone provided 3,4,5-trisubstituted phenols. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate).

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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate

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

Synthesis of Pyrethroids and Jasmonoids through Palladium-Catalyzed Cross-Coupling Reactions was written by Parpal, Florencia;Paullier, Ana Paula;Pandolfi, Enrique;Heguaburu, Viviana. And the article was included in Synthesis in 2022.Application of 105-87-3 This article mentions the following:

The synthesis of jasmone and related jasmonoids and pyrethroids is described. These compounds play a defensive role in plants and share a common cyclopentenone core with variations in the side chains. Jasmone, cinerone, allylrethrone, and derivatives were synthesized through π-allyl palladium cross-coupling of stannane derivatives With selective hydrogenation, dihydrojasmone, and dihydrocinerone were also synthesized. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Application of 105-87-3).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Application of 105-87-3

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

Occurrence and migration of phthalates in adhesive materials to fruits and vegetables was written by Hou, Haonan;Min, Yihao;Liu, Xueke;Wang, Peng;Zhou, Zhiqiang;Liu, Donghui. And the article was included in Journal of Hazardous Materials in 2021.Application of 84-61-7 This article mentions the following:

Labels or tapes are widely used on fresh fruits and vegetables, which may contain phthalates (PAEs). There are few studies on the contamination pathway of PAEs from labels or tapes to food stuff. In this study, the concentrations of eleven PAEs in adhesive labels, tapes, labeled fruits and vegetables on the market were investigated. The eleven PAEs were detected with the total concentration of 7.44-30.51 mg/m2 in labels and tapes. Di-Et phthalate (DEP), di-Bu phthalate (DIBP), di-Me phthalate (DMP), Bis (2-ethylhexyl) phthalate (DEHP) and di-Bu phthalate (DBP) had the highest detection frequency in adhesive material samples. The concentrations of PAEs in labeled fruits were higher than that in unlabeled fruits, especially in the peel, indicating PAEs could transfer from labels or tapes to fruits and vegetables. Furthermore, the migration behaviors of PAEs from labels or tapes to apples, avocados and celery were investigated. It was found that the PAEs could penetrate to apple and avocado pulp through the peel, resulting in the residue of the PAEs in the whole fruit. Unlike apple peel, the thick avocado peel was more difficultly penetrated by the PAEs. Due to the high lipid content, the PAEs distributed more evenly in avocado pulp than in apple pulp. The migrations up to a maximum of 4.16 mg/kg were found for Bu benzyl phthalate (BBP) in avocado peel and up to a maximum of 0.188 mg/kg in avocado pulp. The average migration of the PAEs in celery ranged from 0.3 to 26.1 μg/kg in three days and the low migration might result from the rough surface and less contacting area. These findings suggest that the use of labels or tapes in direct contact may increase the risk of PAEs exposure to humans through fruits and vegetables. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7Application of 84-61-7).

Dicyclohexyl phthalate (cas: 84-61-7) 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. 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.Application of 84-61-7

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

Effect of rare earth nucleating agent on supercritical CO₂ foaming behavior of block copolymerized polypropylene was written by Zhang, Yun;He, Yadong;Xin, Chunling;Su, Yanbin. And the article was included in Cellular Polymers in 2022.Reference of 6683-19-8 This article mentions the following:

The rare earth nucleating agent was used to modify block copolymerized polypropylene (PPB) in foaming process. The results show that the crystallization of PPB and the melting temperature of β-crystal increased gradually with increased β-crystal nucleating agent content. The total crystallinity decreased with amount of addition increasing, and the relative content of β-crystal increased first and then decreased. When β-crystal nucleating agent content was 0.4 wt%, the relative β-crystal content reached the maximum value of 95.27%, and the final crystal grain refinement significantly. The addition of rare earth β-crystal nucleating agent has a good effect on improving the uniformity of foam cells. Under the same content of β-crystal nucleating agent and pressure, the average cell diameter and expansion ratio increased with the saturation temperature increasing. After the foaming temperature reaches 155°C, the expansion ratio began to decrease, which was also consistent with the changed trend of relative β-crystal content. At the same content of temperature and relative β-crystal, as the foaming pressure increased, the cell diameter decreased gradually, and the expansion ratio increased first, and then decreased. 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: 6683-19-8Reference of 6683-19-8).

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 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.Reference of 6683-19-8

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