Category: esters-buliding-blocks

Analysis of 16 phthalate esters in wastewater from textile plants using headspace solid-phase microextraction and gas chromatography with mass spectrometric detection was written by Li, Ying;Ye, XiWen;Niu, ZengYuan;He, Jing;Luo, Xin;Ma, Qiang. And the article was included in Textile Research Journal in 2021.Synthetic Route of C20H26O4 This article mentions the following:

Solid-phase microextraction (SPME) with a 100-娓璵 polydimethylsiloxane (PDMS) fiber coupled to gas chromatog.-mass spectrometry was used to determine 16 phthalate esters (PAEs) in wastewater from textile processing plants. Some of the 16 PAEs that exist as mixtures of isomers were identified and quantified. We investigated the matrix effect and evaluated a qualification and quantitation method for determining trace amounts of PAEs in wastewater from textile processing plants. The major advantages of this approach are the reduced matrix effects from the textile wastewater and the compatibility with the standard addition method (SAM) for PAE quantitation. Moreover, the developed method has low reagent and solvent consumption, does not require clean-up or evaporation steps and involves minimal sample manipulation. Two fiber coatings, 85-娓璵 polyacrylate and 100-娓璵 PDMS, were tested. The variables affecting SPME absorption, such as the sample temperature, extraction time and salt concentration, were studied. The final conditions were an extraction temperature of 95鎺矯, an extraction time of 30 min and a salt concentration of 0.3 g/mL. The SAM was used to analyze and quantify samples. The linear range was between 5 and 20 娓璯/L, and the limits of detection of the method were between 0.5 and 5 娓璯/L. Finally, the precision of the phthalate quantitation was also evaluated. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7Synthetic Route of C20H26O4).

Dicyclohexyl phthalate (cas: 84-61-7) 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. 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.Synthetic Route of C20H26O4

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

Valorisation of Roman chamomile (Chamaemelum nobile L.) herb by comprehensive evaluation of hydrodistilled aroma and residual non-volatile fractions was written by Baranauskiene, Renata;Venskutonis, Petras Rimantas;Ragazinskiene, Ona. And the article was included in Food Research International in 2022.HPLC of Formula: 659-70-1 This article mentions the following:

Valorization of botanicals for the development of natural food-grade ingredients is an important task in terms of sustainability and processing waste reduction In this study, Roman chamomile (Chamaemelum nobile L.) herb was collected at six different vegetation phases in the period 26 May – 23 August 2019 and subjected to biorefining into the several valuable fractions. The yield of hydro-distilled essential oil (EO) was in the range of 0.22% (intensive vegetative growth) to 0.80% (full flowering). Angelic, isobutyric, butyric and methacrylic acid esters and some monoterpene and sesquiterpene derivatives were the major EO constituents: 3-methylpentyl angelate (20.11-27.56%), methallyl angelate (7.28-10.33%), isoamyl angelate (5.57-9.02%), iso-Bu angelate (4.84-6.79%), 2-methylbutyl angelate (3.11-6.32%), 3-methylamyl methacrylate (5.04-6.17%), 3-methylpentyl isobutyrate (4.29-6.64%), 3-methylamyl isobutyrate (4.29-6.64%), 浼?pinene (1.61-6.37%) and pinocarvone (1.46-4.67%). In order to valorize water soluble and solid EO distillation residues their antioxidant potential was evaluated by several in vitro assays: water extracts were considerably stronger antioxidants than acetone extracts isolated from the solid residues. Water extracts of the plants collected at flowering phases were the strongest antioxidants; their TPC, FRAP and ORAC values were up to 143.2 mg gallic acid equivalent/g, 650, and 5601 娓璵ol TE/g dry extract, resp., while effective concentrations (EC50) of DPPH閳?and ABTS閳? scavenging, were down to 0.59 and 0.49 mg/mL, resp. Among 7 tentatively identified by UPLC/Q-TOF/MS phenolic constituents the intensity of mol. ion of 3,5-dicaffeoyl quinic acid was the largest. The results obtained may assist for developing flavorings, antioxidants and health beneficial preparations from C. nobile extracts In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1HPLC of Formula: 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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 绾?valerolactone.HPLC of Formula: 659-70-1

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

Toughening and reinforcing waste polypropylene with POE / nano-SiO₂ under elongational flow was written by He, Hezhi;Gao, Jun;Wang, Yi;Zhu, Zhiwen;Liu, Yufan;Tian, Guidong;Xu, Li;Huang, Zhaoxia. And the article was included in Journal of Applied Polymer Science in 2022.COA of Formula: C73H108O12 This article mentions the following:

Due to the white pollution, the recycling of waste plastics has attracted more and more attention. In this research, waste polypropylene/Ethylene-octene elastomer/nano-SiO₂ composites (wPP/POE/SiO₂) were melt-blended using an Eccentric Rotor Extruder (ERE) dominated by elongational flow field and a Torque Rheometer (TR) dominated by shear flow field, resp. The micromorphol., mech., crystallization, thermal and rheol. properties of wPP/POE/SiO₂ blends were studied. Compared to the blends fabricated by TR, the wPP/POE/SiO₂ blends with different compositions fabricated by ERE showed higher tensile strength, flexural strength, and modulus. Particularly, without sacrificing the tensile strength, the notched impact strength of the wPP/POE/SiO₂ blends fabricated by ERE increased to 13.53 kJ/m², a factor of 3 times larger than that of neat wPP. The enhancement of impact strength of the wPP/POE/SiO₂ blends fabricated by ERE could be ascribed to the good dispersion of POE under elongational flow and the increase of PP crystallinity. The finding from this work provides an efficient way to recycle wPP. 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: 6683-19-8COA of Formula: 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 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. 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.COA of Formula: C73H108O12

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

AlCl₃-promoted [3 + 2] annulation of cis-2,3-disubstituted cyclopropane 1,1-diesters with isothiocyanates: stereoselective synthesis of densely substituted 2-iminodihydrothiophenes was written by Sun, Yongxian;Yang, Gaosheng;Chai, Zhuo;Mu, Xiaolong;Chai, Jun. And the article was included in Organic & Biomolecular Chemistry in 2013.Related Products of 2740-88-7 This article mentions the following:

Cis-2,3-Disubstituted cyclopropane 1,1-diesters were found to be much more reactive than their corresponding trans-isomers in the AlCl₃-promoted [3 + 2]-annulations with isothiocyanates. The reaction with the cis-cyclopropanes proceeded to completion within minutes, providing a variety of densely substituted diastereomerically pure 2-iminodihydrothiophenes in moderate to excellent yields. In the experiment, the researchers used many compounds, for example, 4-Fluorobenzylisothiocyanate (cas: 2740-88-7Related Products of 2740-88-7).

4-Fluorobenzylisothiocyanate (cas: 2740-88-7) 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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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. Related Products of 2740-88-7

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

One-pot synthesis of 5-alkylthio-3H-1,2-dithiole-3-thiones was written by Aimar, Mario L.;Rossi, Rita H.. And the article was included in Tetrahedron Letters in 1996.Application In Synthesis of malonic acid dibutyl ester This article mentions the following:

Dialkyl malonate esters RO₂CCHR¹CO₂R (R = Et, n-Bu, n-octyl, R¹ = H; R = Et, R¹ = PhCH₂) reacted with P₂S₅/S₈ in boiling xylene and with 2-mercaptobenzothiazole/ZnO as catalyst to yield 5-alkylthio-3H-1,2-dithiole-3-thiones I as major products. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Application In Synthesis of malonic acid dibutyl ester).

malonic acid dibutyl ester (cas: 1190-39-2) 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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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 In Synthesis of malonic acid dibutyl ester

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

Plastic additives in ambient fine particulate matter in the Pearl River Delta, China: High-throughput characterization and health implications was written by Liu, Xiaotu;Zeng, Xiaowen;Dong, Guanghui;Venier, Marta;Xie, Qitong;Yang, Mo;Wu, Qizhen;Zhao, Fanrong;Chen, Da. And the article was included in Environmental Science & Technology in 2021.Computed Properties of C20H26O4 This article mentions the following:

Elucidation of the chem. components of airborne fine particulate matter (PM_2.5) facilitates the characterization of atm. contamination sources and associated human exposure risks. In the present study, we employed a high-throughput anal. approach to investigate the abundance and distribution of 163 plastic additives in ambient PM_2.5 collected from 94 different sites across the Pearl River Delta region, China. These chems. are from six categories, including organophosphate esters (OPEs), phthalate esters (PAEs), PAE replacements, bisphenol analogs, UV stabilizers, and antioxidants. Ninety-three of them exhibited a detection frequency greater than 50% in PM_2.5, while the combined concentrations of target plastic additives ranged from 610 to 49,400娓璯/g (median: 3500娓璯/g) across sites. By category, concentrations of PAEs (median: 2710娓璯/g) were one to three orders of magnitude greater than those of other groups, followed by PAE replacements (540娓璯/g) and OPEs (76.2娓璯/g). Chem.-dependent exposure risks to PM_2.5-bound plastic additives were characterized via the estimated daily intake and hazard quotient (HQ) approaches, which resulted in two different risk prioritization systems. Although the HQ approach suggested no or very low health concerns when considering individual chems., the complexity of co-concurrent chems. in PM_2.5 raises the concern on potential health risks from exposure to airborne particles and a cocktail of chem. components. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7Computed Properties of C20H26O4).

Dicyclohexyl phthalate (cas: 84-61-7) 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.Computed Properties of C20H26O4

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

Selective electrolytic fluorinations in 70% HF/30% pyridine was written by Lee, Sarah M.;Roseman, Jamie M.;Zartman, C. Blair;Morrison, Eamonn P.;Harrison, Sean J.;Stankiewicz, Corrie A.;Middleton, W. J.. And the article was included in Journal of Fluorine Chemistry in 1996.Recommanded Product: Ethyl 2-(4-fluorophenyl)acetate This article mentions the following:

The selective fluorination of compounds containing benzylic hydrogen atoms was accomplished by electrolysis in a mixture of 70% HF and 30% pyridine (Olah’s reagent) using a square wave a.c. (1.76-2.75 V, 0.02-0.05 Hz) and Pt electrodes. This method can be used in the laboratory to prepare conveniently gram-size quantities of monofluorinated products. An ion radical mechanism is proposed. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Recommanded Product: Ethyl 2-(4-fluorophenyl)acetate).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) 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. 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.Recommanded Product: Ethyl 2-(4-fluorophenyl)acetate

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

Self-assembled sulfated zirconia nanocrystals with mesoscopic void space synthesized via ionic liquid as a porogen and its catalytic activity for the synthesis of biodiesels was written by Banerjee, Biplab;Bhunia, Subhajit;Bhaumik, Asim. And the article was included in Applied Catalysis, A: General in 2015.HPLC of Formula: 106-79-6 This article mentions the following:

Self-assembled ZrO₂ nanocrystals have been synthesized through a facile chem. route via steam-assisted ionothermal method using 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) as a porogen. The template-free material has been sulfonated by 1(N) H₂SO₄ at room temperature followed by calcination in air at 723 K. Both ZrO₂ and the sulfated zirconia are thoroughly characterized by powder X-ray diffraction (PXRD), ultra high-resolution transmission electron microscopy (UHR-TEM), Fourier transform IR spectroscopy (FT-IR), FE-SEM, N₂ sorption, and NH₃-TPD analyses. The sulfated material has been employed as efficient and environmentally benign heterogeneous catalyst for the synthesis of biodiesels based on long chain fatty acid esters. The catalyst can be easily recovered and reused at least for five times without significant decrease in its catalytic activity. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6HPLC of Formula: 106-79-6).

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. 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.HPLC of Formula: 106-79-6

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

Design of Non-nucleoside Inhibitors of HIV-1 Reverse Transcriptase with Improved Drug Resistance Properties. 2. was written by Freeman, George A.;Andrews, C. Webster III;Hopkins, Andrew L.;Lowell, Gina S.;Schaller, Lee T.;Cowan, Jill R.;Gonzales, Stephen S.;Koszalka, George W.;Hazen, Richard J.;Boone, Lawrence R.;Ferris, Rob G.;Creech, Katrina L.;Roberts, Grace B.;Short, Steven A.;Weaver, Kurt;Reynolds, David J.;Milton, John;Ren, Jingshan;Stuart, David I.;Stammers, David K.;Chan, Joseph H.. And the article was included in Journal of Medicinal Chemistry in 2004.Synthetic Route of C11H20O4 This article mentions the following:

HIV-1 nonnucleoside reverse transcriptase inhibitors (NNRTIs) are part of the combination therapy currently used to treat HIV infection. The features of a new NNRTI drug for HIV treatment must include selective potent activity against both wild-type virus as well as against mutant virus that have been selected by use of current antiretroviral treatment regimens. Based on analogy with known HIV-1 NNRTI inhibitors and modeling studies utilizing the x-ray crystal structure of inhibitors bound in the HIV-1 RT, a series of substituted 2-quinolones was synthesized and evaluated as HIV-1 inhibitors. In the experiment, the researchers used many compounds, for example, Diethyl isobutylmalonate (cas: 10203-58-4Synthetic Route of C11H20O4).

Diethyl isobutylmalonate (cas: 10203-58-4) 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. 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.Synthetic Route of C11H20O4

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

Absolute configuration of in situ crystallized (+)-绾?decalactone was written by Patzer, Michael;Noethling, Nils;Goddard, Richard;Lehmann, Christian W.. And the article was included in Chemistry (Basel, Switzerland) in 2021.Application In Synthesis of 5-Hexyldihydrofuran-2(3H)-one This article mentions the following:

Knowledge about the absolute configuration of small bioactive organic mols. is essential in pharmaceutical research because enantiomers can exhibit considerably different effects on living organisms. X-ray crystallog. enables chemists to determine the absolute configuration of an enantiopure compound due to anomalous dispersion. Here, we present the determination of the absolute configuration of the flavoring agent (+)-绾?decalactone, which is liquid under ambient conditions. Single crystals were grown from the liquid in a glass capillary by in situ cryo-crystallization Diffraction data collection was performed using Cu-K浼?radiation. The absolute configuration was confirmed. The mol. consists of a linear aliphatic non-polar backbone and a polar lactone head. In the solid state, layers of polar and non-polar sections of the mol. alternating along the c-axis of the unit cell are observed In favorable cases, this method of absolute configuration determination of pure liquid (bioactive) agents or liquid products from asym. catalysis is a convenient alternative to conventional methods of absolute structure determination, such as ORD, vibrational CD, UV-visible spectroscopy, use of chiral shift reagents in proton NMR and Coulomb explosion imaging. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Application In Synthesis of 5-Hexyldihydrofuran-2(3H)-one).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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 In Synthesis of 5-Hexyldihydrofuran-2(3H)-one

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