Category: esters-buliding-blocks

What happens to commercial camembert cheese under packaging? Unveiling biochemical changes by untargeted and targeted metabolomic approaches was written by Chen, Xiao;Gu, Zixuan;Peng, Yinghan;Quek, Siew Young. And the article was included in Food Chemistry in 2022.COA of Formula: C6H10O2 This article mentions the following:

Camembert cheese undergoes various biochem. changes during ripening, which lead to its unique aroma and typical flavor characteristics. This study aimed to systemically evaluate the primary biochem. events (lipolysis and proteolysis) and secondary metabolites (flavor compounds) of com. Camembert during 56 days of ripening under packaging conditions. The changes of free fatty acid, free amino acids, soluble nitrogen, proteins/peptides distribution, odorant contribution, and volatile profiles were studied. Results showed that the lipolytic process was prevalent during the initial 14 days, while the proteolysis level continuously increased as the ripening period advanced, causing the index of ripening depth to increase from 4.8% to 13.9%. On day 28, the sample developed odorants with high modified frequency values of 94.3%. With the untargeted metabolomic approaches, two major (γ-butyrolactone and Me heptenone) and four minor (3-methyl-1-butanol, γ-hexalactone, 2-nonanone, and dodecanoic acid) volatile markers were recognized to discriminate the ripening stages of Camembert cheese. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7COA of Formula: C6H10O2).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) 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. 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.COA of Formula: C6H10O2

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

Sensory quality and flavour of alginate coated and repetitive pulsed light treated fresh-cut cantaloupes (Cucumis melo L. Var. Reticulatus Cv. Glamour) during storage was written by Koh, Pei Chen;Noranizan, Mohd Adzahan;Karim, Roselina;Nur Hanani, Zainal Abedin. And the article was included in Journal of Food Science and Technology (New Delhi, India) in 2019.Name: Methyl2-methylbutyrate This article mentions the following:

Fresh-cut fruits are popular due to the convenience provided. However, fresh-cut processes damage fruit tissues and reduce the shelf life of products. Pulsed light (PL) treatment is a decontamination method of foods. PL treatment given repetitively at a certain interval during storage could further extend the shelf life of fresh-cut fruits. Edible coating preserves fresh-cut fruits by providing mech. strength and reducing respiration and water loss. This study was to evaluate the effects of alginate coating combined with repetitive pulsed light (RPL) on sensory quality and flavor of fresh-cut cantaloupes during storage. Cantaloupes were treated with alginate (1.86%, w/v) and RPL (0.9 J/cm² at every 48 h up to 26 days) alone or in combination. Flavor anal. of fresh-cut cantaloupes was carried out every 12 days during storage at 4 ± 1 °C while sensory anal. was performed on day 32. Alginate coating and/or RPL retained sugar contents (17.92-20.01 g/kg FW for fructose, 18.77-19.98 g/kg FW for glucose and 23.02-29.41 g/kg FW for sucrose) in fresh-cut cantaloupes during storage. Combination of alginate with RPL reduced accumulation of lactic acid although alginate coating was more effective to minimise changes of other organic acids in fresh-cut cantaloupes. The combined treatment was also more effective than individual treatment in retaining total aroma compound concentration of fresh-cut cantaloupes during storage with the highest relative concentration, i.e. 3.174 on day 36. Overall, the combined alginate coating and RPL was effective to maintain the fresh-like sensory quality of fresh-cut cantaloupes with insignificant overall acceptability compared to the control. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Name: Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) 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. 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: Methyl2-methylbutyrate

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

One-Pot Synthesis of Imidazole-4-Carboxylates by Microwave-Assisted 1,5-Electrocyclization of Azavinyl Azomethine Ylides was written by Preti, Lisa;Attanasi, Orazio A.;Caselli, Emilia;Favi, Gianfranco;Ori, Claudia;Davoli, Paolo;Felluga, Fulvia;Prati, Fabio. And the article was included in European Journal of Organic Chemistry in 2010.Safety of Methyl 2-thienylacetate This article mentions the following:

Diversely functionalized imidazole-4-carboxylates, e.g., I, were synthesized by microwave-assisted 1,5-electrocyclization of 1,2-diaza-1,3-diene-derived azavinyl azomethine ylides. 1,2-Diaza-1,3-dienes were treated with primary aliphatic or aromatic amines and subjected to microwave irradiation in the presence of aldehydes. 3-Alkyl- and 3-arylimidazole-4-carboxylates were prepared in good yields through a one-pot multicomponent procedure. Modulation of the substituents at C-2, N-3, and C-5 was possible, and 2-unsubstituted imidazoles were obtained when paraformaldehyde was used. In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9Safety of Methyl 2-thienylacetate).

Methyl 2-thienylacetate (cas: 19432-68-9) 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. 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.Safety of Methyl 2-thienylacetate

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

Well-defined epoxide-containing styrenic polymers and their functionalization with alcohols was written by McLeod, David C.;Tsarevsky, Nicolay V.. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2016.Recommanded Product: 27249-90-7 This article mentions the following:

Polymers containing electrophilic moieties, such as activated esters, epoxides, and alkyl halides, can be readily modified with a variety of nucleophiles to produce useful functional materials. The modification of epoxide-containing polymers with amines and other strong nucleophiles is well-documented, but there are no reports on the modification of such polymers with alcs. Using phenyloxirane and glycidyl butyrate as low mol. weight model compounds, it was determined that the acid-catalyzed ring-opening of aryl-substituted epoxides by alcs. to form β-hydroxy ether products was significantly more efficient than that of alkyl-substituted epoxides. An aryl epoxide-type styrenic monomer, 4-vinylphenyloxirane (4VPO), was synthesized in high yield using an improved procedure and then polymerized in a controlled manner under reversible addition-fragmentation chain-transfer (RAFT) polymerization conditions. A successful chain extension with styrene proved the high degree of chain-end functionalization of the poly4VPO-based macro chain transfer agent. Poly4VPO was modified with a library of alcs. and phenols, some of which contained reactive functionalities, e.g., azide, alkyne, allyl, etc., using either CBr₄ (in PhCN at 90 °C for 2-3 days) or BF₃ (in CH₂Cl₂ at ambient temperature over 30 min) as the catalyst. The resulting β-hydroxy ether-functionalized homopolymers were characterized using size exclusion chromatog., ¹H NMR and IR spectroscopy, and thermal gravimetric anal. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Recommanded Product: 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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: 27249-90-7

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

An efficient preparation of novel epoxyketone intermediates for the synthesis of carfilzomib and its derivatives was written by Du, Xiao;Zhang, Hao-yang;Lei, Meng;Li, Zi-yuan;Zhu, Yong-qiang. And the article was included in Journal of Chemical Research in 2016.HPLC of Formula: 87694-53-9 This article mentions the following:

A novel and efficient preparation of epoxyketone intermediates for the synthesis of carfilzomib and its derivatives was developed. Compared to reported methods, this highly stereoselective, environmentally friendly, low-cost method can be used in scaling up the synthesis of carfilzomib and its derivatives 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: 87694-53-9HPLC of Formula: 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 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 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.HPLC of Formula: 87694-53-9

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

Temperature-Dependent Kinetics of the Reactions of Methyl-2-methyl Propionate and Methyl-2-methyl Butanoate with Cl Atoms under Tropospheric Conditions was written by Kaipara, Revathy;Rajakumar, B.. And the article was included in ACS Earth and Space Chemistry in 2020.HPLC of Formula: 868-57-5 This article mentions the following:

The relative rate technique coupled with gas chromatog. (GC)-flame ionization detection was used to investigate the kinetics of the reaction of Me 2-methylpropionate (M2MP) and Me 2-methylbutanoate (M2MB) with the Cl atom between 268 and 363 K and at 760 Torr of N₂ as a diluent gas. Temperature-dependent Arrhenius expressions were obtained as k_268-363K^M2MP+Cl = [(7.15 ± 1.16) x 10^-12 exp((566 ± 50)/T)] cm³ mol.^-1 s^-1 and k_268-363K^M2MB+Cl = [(6.88 ± 0.80) x 10^-12 exp((794 ± 125)/T)] cm³ mol.^-1 s^-1. The rate coefficients (in units of cm³ mol.^-1 s^-1) at 298 K were measured to be k_298K^M2MP+Cl = (4.61 ± 1.28) x 10^-11 and k_298K^M2MB+Cl = (9.44 ± 1.90) x 10^-11. In addition to this, the measured kinetics were also compared with the kinetics computed using the canonical variational transition state theory/small curvature tunneling /interpolated single-point energies method. The degradation mechanism was also postulated using GC-mass spectrometry and GC-IR spectrometry as the anal. methods. Furthermore, the atm. lifetimes of the test mols. were estimated and are presented in this article. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5HPLC of Formula: 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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.HPLC of Formula: 868-57-5

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

Phthalate diversity in eggs and associations with oxidative stress in the European herring gull (Larus argentatus) was written by Allen, Simon F.;Ellis, Francesca;Mitchell, Christopher;Wang, Xianyu;Boogert, Neeltje J.;Lin, Chun-Yin;Clokey, Joseph;Thomas, Kevin V.;Blount, Jonathan D.. And the article was included in Marine Pollution Bulletin in 2021.Electric Literature of C20H26O4 This article mentions the following:

Phthalates are plastic-derived contaminants that are ubiquitous in natural environments and function as pro-oxidants. The extent to which phthalates bioaccumulate in wild animals and associations with oxidative stress are poorly understood. Here, we describe relationships between maternally-derived phthalates, lipid peroxidation (malondialdehyde, MDA) and the dietary antioxidant α-tocopherol in eggs of European herring gulls (Larus argentatus) in Cornwall, UK. Up to six phthalate parent compounds and four phthalate metabolites were detected. Egg concentrations of MDA were pos. associated with dicyclohexyl phthalate (DCHP) and neg. associated with α-tocopherol, suggesting that DCHP is associated with oxidative stress in gulls. The consequences of phthalate exposure in ovo for offspring development warrants study. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7Electric Literature of C20H26O4).

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. 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.Electric Literature of C20H26O4

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

Electrochemical two-electron oxygen reduction reaction (ORR) induced aerobic oxidation of α-diazoesters was written by Ruan, Mengyao;Chen, Liang;Wen, Ziyang;Yang, Fan;Ma, Chao;Lu, Cuifen;Yang, Guichun;Gao, Meng. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2022.Recommanded Product: 587-88-2 This article mentions the following:

The recent progress in the oxidation of α-diazoesters R¹C(=N₂)C(O)OR² (R¹ = Ph, 2-naphthyl, benzo[d][1,3]dioxol-5-yl, etc.; R² = Me, cyclohexyl, (tetrahydrofuran-2-yl)methyl, etc.) to α-ketoesters R¹C(O)C(O)OR² by in situ generated hydrogen peroxide via a two-electron oxygen reduction approach was described. A diverse collection of valuable α-ketoester products was obtained with moderate to high yields under an exogenous-oxidant-free and metal catalyst-free electrochem. conditions. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Recommanded Product: 587-88-2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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: 587-88-2

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

Rh(III)-Catalyzed C(7)-H Alkylation of Quinolines in the Synthesis of Angular π-Extended Pyrroloquinolines for Single-Component White-Light Emission was written by Khot, Nandkishor Prakash;Mahato, Paritosh;Sajeev, T. K.;Mukherjee, Saptarshi;Kapur, Manmohan. And the article was included in Organic Letters in 2022.Category: esters-buliding-blocks This article mentions the following:

Reported herein is a sustainable approach for a regioselective Rh(III)-catalyzed C(7)-H alkylation of 8-aminoquinolines via metal carbene migratory insertion. This transformation displays a high functional group tolerance and exquisite site selectivity to afford the C-7 alkylated products I [R¹ = H, 2-Me, 3-Br, etc., R² = Me, Et, Ar = Ph, 4-FC₆H₄, 2-furyl, etc.]. These products were derivatized to afford π-extended angular pyrroloquinolines II [R³ = H, Me, R⁴ = H, 7-(4-HOC₆H₄), 7-(4-MeOC₆H₄), Ar¹ = Ph, 3-FC₆H₄, 2-thienyl, etc.], one of which, II [R³ = R⁴ = H, Ar = 2-thienyl], showed white-light emission (WLE) with CIE coordinates (0.26, 0.34). An excellent cell viability and in vivo cellular imaging substantiated the nontoxic nature of these compounds In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Category: esters-buliding-blocks).

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. 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.Category: esters-buliding-blocks

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

Vaporization/sublimation enthalpies of mono- and dimethyl-esters estimated by solution calorimetry method was written by Samatov, Aizat A.;Nagrimanov, Ruslan N.;Miroshnichenko, Evgeniy A.;Solomonov, Boris N.. And the article was included in Thermochimica Acta in 2020.Formula: C12H22O4 This article mentions the following:

The additive scheme for calculating the solvation enthalpies of aliphatic compounds has been developed for linear mono- and dimethyl-esters. Ester group contribution to the enthalpy of solvation in n-heptane was obtained. Accuracy of the proposed approach for determination of solvation enthalpies of linear mono- and dimethyl-esters was tested by comparison with exptl. solvation enthalpies. In most cases, deviations do not exceed 1 kJ·mol^-1. It was found that the dependence of the solution enthalpies of mono- and dimethyl-esters on the number of carbon atoms in the mol. can be fitted by power function. This dependence and a group-additivity scheme for solvation enthalpy were used for estimation of the enthalpies of phase transitions of mono- and dimethyl-esters. Evaluated values of sublimation, vaporization, and fusion enthalpies at 298.15 K are in good agreement with exptl. data obtained by conventional methods. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Formula: C12H22O4).

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. Formula: C12H22O4

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