Category: esters-buliding-blocks

Mechanical and Processing Enhancement of a Recycled HDPE/PPR-Based Double-Wall Corrugated Pipe via a POE-g-MAH/CaCO₃/HDPE Polymer Composite was written by Wang, Yutong;Lu, Lichang;Hao, Yu;Wu, Yujie;Li, Yuanzhe. And the article was included in ACS Omega in 2021.Electric Literature of C73H108O12 This article mentions the following:

With the people’s awareness of the “3Rs” in recent years, using recycled high-d. polyethylene (HDPE) and random copolymer polypropylene (PPR) as the base materials for piping fabrication has become a mainstream in scholastic path and industrial engineering. In this study, the modified maleic anhydride-grafted polyethylene (POE-g-MAH) compatibilizer was fabricated to increase the interfacial adhesion and dispersion. With the surface modification of calcium carbonate, a POE-g-MAH/CaCO₃/HDPE polymer composite has been prepared Such modified polymer composites can further reinforce the processing performance and mech. properties of recycled HDPE and PPR materials. The results indicated that with the introduction of the polymer composite, significant enhancement of the recycled materials in the aspects of processability, tensile strength, flexural performance, and impact force could be obtained, and the POE-g-MAH/CaCO₃/HDPE polymer composite would contribute to the impressive balance between high rigidity and toughness. In addition, the feasibility and mech. properties of the recycled HDPE-PPR-POE-g-MAH/CaCO₃/HDPE blended system were also studied: with the help of a composite microcapsule, the gap of mech. capacity between recycled and non-recycled materials was further reduced, and such a blended system was capable of being commercialized in the piping industry. 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: 6683-19-8Electric Literature 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 typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. 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.Electric Literature of C73H108O12

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

Organic Chemical Contaminants in Water System Infrastructure Following Wildfire was written by Draper, William M.;Li, Na;Solomon, Gina M.;Heaney, Yvonne C.;Crenshaw, Reese B.;Hinrichs, Richard L.;Chandrasena, R. Esala P.. And the article was included in ACS ES&T Water in 2022.Computed Properties of C73H108O12 This article mentions the following:

Wildfires have destroyed multiple residential communities in California in recent years. After fires in 2017 and 2018, high concentrations of benzene and other volatile organic compounds (VOCs) were found in public drinking water systems in fire-affected areas. The sources of the contamination and appropriate remediation have been urgent matter of investigation. This study characterizes target and nontarget VOCs and semivolatile organic compounds in water from a highly contaminated service line after the 2018 Camp Fire (Paradise, CA). Ninety-five organic compounds were identified or tentatively identified in the service line. Laboratory combustion experiments with drinking water pipes made of polyvinyl chloride (PVC), cross-linked polyethylene, and high-d. polyethylene and a review of the literature were used to evaluate potential sources of the detected chems. Among the service line contaminants were 32 compounds associated with PVC pyrolysis and 28 organic compounds also associated with the pyrolysis of polyethylene. The service line sample also contained 55 compounds associated with uncontrolled burning of biomass and waste materials. The findings support hypotheses that wildfires can contaminate drinking water systems both by thermal damage to plastic pipes and intrusion of smoke. Residual chlorine disinfectants in the water system modify the contaminant distribution observed 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: 6683-19-8Computed Properties 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. 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.Computed Properties of C73H108O12

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

Transesterification of malonic esters was written by Bondar, L. S.;Rodionov, P. P.;Okunev, R. A.. And the article was included in Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya in 1968.Recommanded Product: malonic acid dibutyl ester This article mentions the following:

Transesterification of malonic esters with various types of alcs. in the presence of alk. and acidic catalysts has been studied. Transesterification of esters catalyzed by alkali proceeds according to an SN2 mechanism and, when catalyzed by acids, proceeds according to a polycentric mechanism. In the former case transesterification of malonic ester (I) is facilitated by enolization of I and in the later case, by the formation of a cyclic intermediate. The corresponding alc. and the catalysts are heated to solution and then a lower ester of malonic acid (dimethyl, diethyl, or dipropyl) is added and the mixture boiled. The alc. formed in the reaction is continuously distilled The reaction is considered complete as soon as the alc. added in the beginning begins to distill. Eleven esters of malonic acid CH2(CO2R)2 (R = n-Pr, n-Bu, sec-Bu, n-C5H11), n-C6H13, cyclohexyl, n-C7H15, PhCH2, n-C9H19, or n-C10H21) were obtained in good yields (69.9 to 96.6%), their physicochem. constants agreed well with those reported in the literature. Transesterification proceeds easily if the difference in the b.ps. of the alc. taken and the alc. formed in the reaction is large. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: malonic acid dibutyl ester).

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

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

Influence of 6 different strains of yeasts on polyphenol composition of Barbera wines obtained with delayed extraction of anthocyanins was written by Bosso, A.;Guaita, M.;Follis, R.;Di Stefano, R.. And the article was included in Rivista di Viticoltura e di Enologia in 2002.Application of 15399-05-0 This article mentions the following:

Six strains of Saccharomyces cerevisiae yeasts were used in the production of red Barbera wines. The wine d., ethanol, total anthocyanins, total flavonoids, proanthocyanidins, total polyphenols, flavans, volatile acidity, acetaldehyde, SO₂, pH, color, volatile compounds, and sensory properties (flavor, taste) were evaluated during grape maceration and wine aging. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Application of 15399-05-0).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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.Application of 15399-05-0

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

Phenylalanine-Based Inactivator of AKT Kinase: Design, Synthesis, and Biological Evaluation was written by Nguyen, Thuy;Coover, Robert A.;Verghese, Jenson;Moran, Richard G.;Ellis, Keith C.. And the article was included in ACS Medicinal Chemistry Letters in 2014.Product Details of 87694-53-9 This article mentions the following:

Strategies to inhibit kinases by targeting the substrate binding site offer many advantages, including naturally evolved selectivity filters, but normally suffer from poor potency. In this work we propose a strategy to design and prepare covalent substrate-competitive kinase inhibitors as a method to improve potency. We have chosen AKT as the model kinase for this work. Using the AKT-GSK3β cocrystal structure and a reactive cysteine near the substrate binding site, we have identified phenylalanine (Phe) as an appropriate scaffold for the covalent inactivator portion of these inhibitors. By synthesizing compounds that incorporate cysteine-reactive electrophiles into phenylalanine and testing these compounds as AKT inhibitors, we have identified Boc-Phe-vinyl ketone as a submicromolar inactivator of AKT. We also show that Boc-Phe-vinyl ketone (1) potently inhibits AKT1 and inhibits cell growth in HCT116 and H460 cells nearly as well as AKT inhibitors GSK690693 and MK-2206, (2) is selective for kinases that possess an activation loop cysteine such as AKT, (3) requires the vinyl ketone for inactivation, (4) has inactivation that is time-dependent, and (5) alkylates Cys310 of AKT as shown by mass spectrometry. Identification of Boc-Phe-vinyl ketone as a covalent inactivator of AKT will allow the development of peptide and small-mol. substrate-competitive covalent kinase inhibitors that incorporate addnl. substrate binding elements to increase selectivity and potency. This proof-of-principle study also provides a basis to apply this strategy to other kinases of the AGC and CAMK families. In the experiment, the researchers used many compounds, for example, (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9Product Details of 87694-53-9).

(S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9) 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.Product Details of 87694-53-9

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

Elaboration of double emulsion-based polymeric capsules for fragrance was written by Stasse, Margot;Ribaut, Tiphaine;Heroguez, Valerie;Schmitt, Veronique. And the article was included in Colloid and Polymer Science in 2021.COA of Formula: C10H18O2 This article mentions the following:

Abstract: We aim at encapsulating fragrances made of a variety of lipophilic species to slow down their diffusion. Our strategy is to develop capsules by polymerizing the water intermediate phase of an oil-in-water-in-oil double emulsion. In other terms, our system consists in a direct emulsion of fragrance (O1) in a water phase (W) containing monomer, initiator, and cross-linker. To obtain the double emulsion, this direct emulsion, stabilized by a hydrophilic surfactant, is itself dispersed in an external lipophilic solvent used in perfumery (O2) and stabilized by a lipophilic surfactant. Polymerization of the intermediate water phase aims at obtaining a 3D network. Differently from nowadays-proposed capsules, this strategy allows polymerization only taking place in the water phase rather in the phase containing the fragrance. Moreover, the obtained 3D network is supposed to play the role of an effective barrier limiting the diffusion of the inner lipophilic species towards either the external solvent or air. Such an approach implies the combination of a formulation step to elaborate the double emulsion using two antagonistic surfactants, a hydrophilic one and a lipophilic one, and of the polymerization of the intermediate phase. Insertion of the polymerizable species in the double emulsion shall not destabilize it. Some monomers exhibiting interfacial affinity and interfering with the formulation of the double emulsion have to be avoided. By varying the nature of the monomers and the cross-linker to monomer ratio, capsules with high encapsulation efficiencies and with various mech. properties have been obtained. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9COA of Formula: C10H18O2).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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: C10H18O2

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

Propellanes. Part LXXXII. Preparation and labeling of [20.3.3]propellane-24,27-dione was written by Ashkenazi, Pnina;Kettenring, Juergen;Migdal, Shmuel;Gutman, Arie L.;Ginsburg, David. And the article was included in Helvetica Chimica Acta in 1985.SDS of cas: 3903-40-0 This article mentions the following:

The title compound I was prepared by Kolbe’s electrochem. reaction of MeO₂C(CH₂)₁₀CO₂H to give MeO₂C(CH₂)₂₀CO₂Me which was treated with Na and Me₃SiCl in PhMe, and then aqueous HCl-THF to give 89% the hydroxy ketone II (R = OH, R¹ = H). Treatment of II with Bi₂O₃ in AcOH gave 77% the diketone II (RR¹ = O) which was treated with MeO₂CCH₂COCH₂CO₂Me and KOH in MeOH-C₆H₆ for 10 days, followed by 6N HCl to give 83.3% I. Treatment of I with D₂O and HCl in a sealed tube at 120° achieved more than 90% incorporation of ²H at the positions α to the carbonyls. However, similar treatment of I with tritiated water achieved only 3% ³H-incorporation. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0SDS of cas: 3903-40-0).

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. 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: 3903-40-0

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

Synthesis, structure, absorption and fluorescence of Pechmann dye heteroanalogues was written by Aysha, Tarek;Lunak, Stanislav Jr.;Lycka, Antonin;Vynuchal, Jan;Elias, Zdenek;Ruzicka, Ales;Padelkova, Zdenka;Hrdina, Radim. And the article was included in Dyes and Pigments in 2013.Synthetic Route of C9H10O3S This article mentions the following:

Three N-analogs of Pechmann dye with identical aryl groups in the 5, 5′-positions (aryl = Ph, 2-naphthyl, 2-thienyl) and carboxy ester groups in the 3,3′-positions were synthesized by oxidative dimerization of the corresponding 5-aryl-pyrrolinone esters. Derivatives with improved solubility in most organic solvents were prepared by subsequent N-methylation. The dyes were confirmed as E isomers, i.e. holding an all-trans 1,6-diaryl-1,3,5-hexatriene backbone, with slight torsion of central CC bond by X-ray diffraction and d. functional theory (DFT) calculations No E/Z photoisomerization was observed Full assignment of ¹H and ¹³C NMR signals was performed. The absorption spectra are quite similar with the maxima in the range 572 nm (aryl = phenyl)-643 nm (aryl = 2-thienyl) in accordance with time dependent DFT calculations of excitation energies. No fluorescence was observed in solution, while all compounds fluoresce in low temperature solvent glass (77 K) and a weak solid-state fluorescence of Ph and 2-naphthyl derivatives in red/IR region was detected. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Synthetic Route of C9H10O3S).

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. 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 C9H10O3S

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

Selective cyclization of alkynols and alkynylamines catalyzed by potassium tert-butoxide was written by Li, Deng Yuan;Shi, Ke Ji;Mao, Xiao Feng;Zhao, Zheng Le;Wu, Xin Yan;Liu, Pei Nian. And the article was included in Tetrahedron in 2014.Synthetic Route of C13H15NO2 This article mentions the following:

Potassium tert-butoxide (t-BuOK) was found to be an effective catalyst for the cyclization of aromatic alkynols and alkynylamines. In the presence of 10 mol % t-BuOK, a range of alkynols were converted to the corresponding exo-cyclic enol ethers as pure Z-stereoisomers with 100% selectivity and moderate to excellent yields. Moreover, the cyclization of alkynylamines was also achieved to afford indoles and isoindolin-1-ones in good yields. In the experiment, the researchers used many compounds, for example, tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3Synthetic Route of C13H15NO2).

tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3) 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. 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.Synthetic Route of C13H15NO2

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

Analysis and comparison of volatile components in purple rice sweet wine with different sterilization treatments by electronic nose and headspace gas chromatography-ion mobility spectrometry was written by Peng, Xu-yi;Zheng, Jing-shao;Liu, Yu-hang;Xu, Lin-huan;Kuang, Wei-yang;Huang, Wei. And the article was included in Xiandai Shipin Keji in 2021.Product Details of 868-57-5 This article mentions the following:

In order to select a more suitable sterilization method and maintain the original flavor of purple rice sweet wine as much as possible, this article used electronic nose, headspace gas chromatog.-ion mobility spectroscopy (HS-GC-IMS) to analyze and compare the volatile components of four groups of samples of heat sterilization, irradiation sterilization, ultra-high pressure sterilization and unsterilized control. The results of electronic nose test showed that the discrimination between the samples was good, and the differences of volatile components were mainly caused by nitrogen oxides, alcs. and aldehydes and ketones, methyls, sulfides. HS-GC-IMS detection and identification found that the 4 groups of samples shared 42 substances in 7 categories of alcs., esters, aldehydes, ketones, acids, olefins and alkanes. The relative content of alcs. was the highest (62.03%∼65.73%), followed by esters (12.70%∼13.93%) and ketones (9.36%∼11.59%), the sterilization method had a great influence on the relative content of each component. The relative odor activity value (ROAV) showed that there were 11 key flavor compounds in the samples, mainly including Et 2-methylbutyrate (69.39∼100), acetaldehyde (38.61∼42.05), Et isovalerate (18.16∼27.23), isoamyl alc. (9.91∼18.08), butyraldehyde (14.13∼18.06), Et isobutyrate (8.22∼12.18). Both linear discriminant anal. and nearest neighbor algorithm anal. showed that the volatile components of ultra-high pressure and unsterilized samples were the most similar, followed by irradiation and heat sterilization samples, indicating that ultra-high pressure sterilization had the least effect on the aroma of samples, which was the best sterilization method for purple rice wine. The results of this study provide reference value for the selection of sterilization methods for sweet fermented rice. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Product Details of 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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.Product Details of 868-57-5

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