Category: esters-buliding-blocks

Volatile composition of Baga red wine Assessment of the identification of the would-be impact odorants was written by Rocha, Silvia M.;Rodrigues, Fanny;Coutinho, Paula;Delgadillo, Ivonne;Coimbra, Manuel A.. And the article was included in Analytica Chimica Acta in 2004.Recommanded Product: 15399-05-0 This article mentions the following:

Wines produced from Baga native variety from the Portuguese Bairrada Appellation, harvest 2000, were submitted to a liquid-liquid continuous extraction with dichloromethane and anal. by gas chromatog.-mass spectrometry (GC-MS). A total of 53 compounds were identified and quantified. This wine has 225 mg l^-1 volatile compounds, which include aliphatic and aromatic alcs. (44%), acids (27%), esters (15%), lactones (6%), amides (5%), and phenols (1%). To achieve the identification of the major would-be impact odorants, the aroma index was calculated using the concentration of each volatile component and the corresponding odor threshold reported in the literature. This methodol. proved suitable, as a preliminary step, for the determination of the would-be impact odorants of Baga wine. From the 53 compounds identified, 9 were determined as the most powerful odorants: guaiacol, 3-methylbutanoic acid, 4-ethoxycarbonyl-γ-butyrolactone, isobutyric acid, 2-phenylethanol, γ-nonalactone, octanoic acid, Et octanoate and 4-(1-hydroxyethyl)-γ-butyrolactone. These data suggest Baga wine as a fruity-type product with an aroma correlated to a restricted number of compounds In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Recommanded Product: 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. 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: 15399-05-0

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

Migration of polymer additives and radiolysis products from irradiated PET/PE films into a food simulant was written by Wang, Yini;Wu, Jingjie;Liu, Bingjie;Xia, Yining;Lin, Qinbao. And the article was included in Food Control in 2021.Application of 6683-19-8 This article mentions the following:

The com. application of food irradiation has raised increasing concern regarding the migration of chem. hazards from irradiated food packaging materials which may threaten food safety and human health. In this study, polymer additives and radiolysis products that migrated from irradiated PET/PE films into a fatty food simulant (95% ethanol) were identified using a UHPLC-QTOF/MS method. Based on the identification results, six additives were selected and their migration behaviors were evaluated under the effect of gamma and electron beam irradiation at a dose of 10 kGy. No significant change in migration levels was observed after irradiation treatment in additives with superior resistance to irradiation (e.g., fatty acid amides). Migration levels of additives vulnerable to irradiation (e.g., antioxidants and disubstituted glycerides) exhibited a decrease, which varied between the different types of irradiation treatments. Decrease in the concentration of phosphite antioxidant (Irgafos 168) was associated with increase in the concentration of its oxidized product (Irgafos 168-ox) that was induced by irradiation In addition, migration levels of additives were affected by partitioning between the polymer and the food simulant. A high migration level was observed in antioxidants that were predominantly present in the food simulant (due to migration) rather than in the polymer before irradiation treatment. The findings of the present study provide insights into future studies on chem. migration from packaging materials into irradiated food. 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: 6683-19-8Application 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 typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. 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 6683-19-8

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

Essential Oil, Aroma, and Fatty Acid Profiles of Five Endemic Salvia Taxa from Turkey with Chemometric Analysis was written by Ertas, Abdulselam;Akdeniz, Mehmet;Yener, Ismail;Ozturk, Mehmet;Tokul Olmez, Ozge;Firat, Mehmet;Kolak, Ufuk. And the article was included in Chemistry & Biodiversity in 2022.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

The essential oil, aroma, and fatty acid compositions of Salvia cerino-pruinosa var. cerino-pruinosa, S. cerino-pruinosa var. elazigensis, S. pseudeuphratica, S. rosifolia, and S. kurdica collected in 2015, 2016, and 2017 were analyzed by GC-FID, GC/MS/Head Space and GC/MS. The results were evaluated chemometrically for principal component analyses and hierarchical clustering analyses using Minitab program. The main components of their essential oils have been determined as germacrene-D (41.79 % highest for these species), camphor (55.80 %), linalool (33.38 %), caryophyllene oxide (32.99 %), 1,8-cineole (26.30 %) and geraniol acetate (31.63 %), while for aroma 1,8-cineole (45.95 % highest for these species), camphor (58.54 %), D-limonene (40.83 %), linalool (27.67 %) and cis-linalool oxide (25.87 %). Oleic (72.65 % highest for these species), erucic (44.61 %), 2-palmitoleic (42.17 %) and nervonic (32.61 %) acids were determined as major components of their fatty acids. According to the PCA and HCA, the essential oil components of these Salvia taxa unaffected by the years, and accordingly, the Salvia taxa grouped among themselves. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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. 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 In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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

The total synthesis of chlorophyll a was written by Woodward, Robert Burns;Ayer, William A.;Beaton, John M.;Bickelhaupt, Friedrich;Bonnett, Raymond;Buchschacher, Paul;Closs, Gerhard L.;Dutler, Hans;Hannah, John. And the article was included in Tetrahedron in 1990.Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate This article mentions the following:

The total synthesis of chlorophyll a starting Knorr’s pyrrole (I) is described with full exptl. detail. Forty six stages are involved to reach the target mol., chlorin e₆ tri-Me ester (II) from which chlorophyll a has already been prepared The four pyrroles which are required for rings A, B, C and D are elaborated largely by known reactions, although with considerable improvements. These pyrroles are manipulated to give two dipyrrin derivatives These are brought together in a carefully controlled, stepwise, condensation to give a single porphyrin product in 50% yield. Eleven steps complete the synthesis. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate).

Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) 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. 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.Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate

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

Deodorizing the king of fruits: Durian stalk deodorizes the aroma of durian was written by Tan, Ke Qi;Lim, Zhi Kheng;Fang, Esther Zi Hui;Pui, Carmen Sze Min;Lv, Yunbo;Zhang, Hua Jun;Chua, Chun Kiang. And the article was included in Journal of the Chinese Chemical Society (Weinheim, Germany) in 2021.Category: esters-buliding-blocks This article mentions the following:

Durian fruit is well-known for its strong aroma due to the presence of esters and sulfur compounds Although the usage of durian husk as a deodorizing agent of durian aroma has been a known practice, there is a lack of scientific evidence. Here, we investigated the effect of using durian stalk extract to deodorize durian aroma. Static-headspace gas chromatog.-mass spectrometry technique is used to semi-quant. track the variation of 13 esters and sulfur compounds found in durian. Durian stalk extract reduced the amount of esters and sulfur compounds in headspace up to 45 and 55%, resp. NaCl, CaCl2, and Na2SO4 provided a similar effect on sulfur compounds In addition, lemon and ginger extracts were evaluated and the latter performed as well as durian stalk extract This study has implications for the application of durian husk as a biomass feedstock for the development of plant-based deodorizers. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

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. 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.Category: esters-buliding-blocks

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

Elucidation of the Key Role of [Ru(bpy)₃]²⁺ in Photocatalyzed RAFT Polymerization was written by Christmann, Julien;Ibrahim, Ahmad;Charlot, Vincent;Croutxe-Barghorn, Celine;Ley, Christian;Allonas, Xavier. And the article was included in ChemPhysChem in 2016.Recommanded Product: Benzyl benzodithioate This article mentions the following:

Photocatalysis reactions using [Ru^II(bpy)₃]²⁺ were studied on the example of visible-light-sensitized reversible addition-fragmentation chain transfer (RAFT) polymerization Although both photoinduced electron- and energy-transfer mechanisms are able to describe this interaction, no definitive exptl. proof has been presented so far. This paper investigates the actual mechanism governing this reaction. A set of RAFT agents was selected, their redox potentials measured by cyclic voltammetry, and relaxed triplet energies calculated by quantum mechanics. Gibbs free-energy values were calculated for both electron- and energy-transfer mechanisms. Quenching rate constants were determined by laser flash photolysis. The results undoubtedly evidence the involvement of a photoinduced energy-transfer reaction. Controlled photopolymerization experiments are discussed in the light of the primary photochem. process and photodissociation ability of RAFT agent triplet states. 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. 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.Recommanded Product: Benzyl benzodithioate

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

Naphthyridines. I. Synthesis of (2-amino-3-pyridyl)diphenylcarbinols and their cyclization to 4-phenyl-2,3-benzo-1,8-naphthyridines was written by Konshin, M. E.;Chesnokov, V. P.. And the article was included in Khimiya Geterotsiklicheskikh Soedinenii in 1973.Synthetic Route of C7H8N2O2 This article mentions the following:

Diphenylcarbinols (I; R = H, Cl, Br) were prepared in 63-70% yield by a Grignard reaction of PhMgBr with the appropriate Me 2-aminonicotinate. Heating I 2 hr in PhNO2 at 210-15° gave �0% yield of benzonaphthyridines (II; R = H, Cl). In the experiment, the researchers used many compounds, for example, Methyl 2-aminonicotinate (cas: 14667-47-1Synthetic Route of C7H8N2O2).

Methyl 2-aminonicotinate (cas: 14667-47-1) 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. 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.Synthetic Route of C7H8N2O2

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

Study on volatile aroma compounds in donkey broths of different stewing time was written by Wang, Shuqi;Liu, Haoyue;Xie, Tian;Zhang, Ning;Sun, Jie;Chen, Haitao;Sun, Baoguo. And the article was included in Flavour and Fragrance Journal in 2022.Category: esters-buliding-blocks This article mentions the following:

Donkey broth has a unique aroma and is affected by cooking time. Five donkey broth samples of different stewing time were prepared The volatile components were extracted by solvent-assisted flavor evaporation (SAFE) and analyzed by gas chromatog.-mass spectroscopy (GC-MS). According to the result, a total of 45 volatile aroma compounds were identified in five donkey broths (stewing time of 0 min, 1, 2, 3 and 4 h resp.). In terms of gas chromatog.-olfactometry (GC-O) anal., aroma extraction dilution anal. (AEDA) and calculating odor activity values (OAVs), resp. 26 and 15 aroma active compounds were pointed out significantly in five donkey broths. Twelve odorants including 2-Me pentanal, 3-hydroxyl-2-butanone, hexanal, di-Me trisulfide, nonanal, 3-(Methylthio)propanal, 2-ethyl-1-hexanol, benzaldehyde, 4-methoxyallylbenzene, (E,E)-2,4-nonadienal, delta-hexalactone and octanoic acid were characterized as the common aroma active compounds existed in donkey broths with different stewing time. Principal component anal. (PCA) and sensory evaluation results characterized the difference of aroma profiles for the five different donkey broths, which showed that the duration of the stewing time had an important effect on the general flavor of donkey broth. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Category: esters-buliding-blocks).

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. 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.Category: esters-buliding-blocks

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

Stability of low density lipoprotein particles affect the formation of off-flavor in thermal egg yolk was written by Ren, Liuyang;Ma, Jie;Xu, Weili;Lv, Ying;Tong, Qigen. And the article was included in Food Research International in 2022.Safety of Methyl2-methylbutyrate This article mentions the following:

This study aimed to investigate the role of stability of low d. lipoprotein (LDL) spherical particles as well as oxidation of lipids and proteins on formation of off-odor in heated egg yolk (EY). Off-odor attributes and volatile components of EY with different thermal temperature (25°C-90°C) were investigated by sensory evaluation, gas chromatog.-mass spectrometry (GC-MS) and GC-ion mobility spectrometry (IMS). The off-flavor and volatile compounds increased significantly when EY were heated at 60°C-65°C. Destruction of LDL particle structure was presented by confocal laser scanning microscopy with thermal treatment at 60°C. A pos. correlation (r = 0.899, p < 0.05) was shown between oil exudation and off-odor of heated EY. Moreover, oxidation of lipids and proteins, protein aggregation, and changes of protein secondary structure (increased β-sheets and decreased α-helixes) in LDL particles were all found when heating temperature rose to 65°C. It was speculated that unstability of LDL particles resulted in the leakage of lipids; then oxidative products of lipids took part in the formation of off-odor volatiles in heated EY. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Safety of 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. 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. Safety of Methyl2-methylbutyrate

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

Stereoselective Synthesis of Z-Vinylsilanes via Palladium-Catalyzed Direct Intermolecular Silylation of C(sp²)-H Bonds was written by Pan, Jin-Long;Chen, Chao;Ma, Zhi-Gang;Zhou, Jia;Wang, Li-Ren;Zhang, Shu-Yu. And the article was included in Organic Letters in 2017.HPLC of Formula: 587-88-2 This article mentions the following:

An efficient and convenient Pd-catalyzed direct intermol. silylation of C(sp²)-H bonds by using disilanes as the Si source with the assistance of a readily removable bidentate directing group is reported. This strategy provided a regio- and stereoselective protocol for exclusive synthesis of Z-vinylsilanes with reasonable to excellent yields and good functional group compatibility. Silylation of the isolated palladacycle intermediate revealed the Z-stereoselective pathway. Also, the practicality and effectiveness of this method were illustrated by a gram-scale experiment and further functionalization of the silylation product. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2HPLC of Formula: 587-88-2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) 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. 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. HPLC of Formula: 587-88-2

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