Category: esters-buliding-blocks

Analysis of the key aroma volatile compounds in rice bran during storage and processing via HS-SPME GC/MS was written by Gao, Chen;Li, Yan;Pan, Qifeng;Fan, Mingcong;Wang, Li;Qian, Haifeng. And the article was included in Journal of Cereal Science in 2021.HPLC of Formula: 695-06-7 This article mentions the following:

Rice bran is one of the most valuable nutritional byproducts of rice milling. It is known to have an unacceptable flavor to consumers, so the development of reliable anal. methods to determine its unpleasant volatile compounds should be developed. Comparative volatile profiling of rice bran at different times of accelerated storage was performed using solid-phase microextraction (SPME) coupled to GC/MS, and the impact of stabilizing methods on the odor of rice bran was evaluated using E-nose, GC/MS and gas chromatog.-olfactometry (GC-O) analyses. Sixty-five volatile compounds were identified and classified into six groups. Among them, the relative concentration of aldehydes increased with storage time, and hexanal was the compound with the highest content. Similar behavior was exhibited by ketones and alcs., which were connected with early oxidation of rice bran. The main characteristic odor compounds of rice bran were vanillin, 2-methoxy-4-vinylphenol and 5-amino-2-methoxyphenol regarding ferulic acid. Through PCA, the volatile compounds of six kinds of rice bran were distinguished. The GC-O experiment verified that the processed products changed from the original grassy, oily flavor to vanilla, cheese, and caramel flavors. These results comprehensively elucidate the flavor characteristics of rice bran and provide important theor. support for the development of rice bran products. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7HPLC of Formula: 695-06-7).

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

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

Visible-Light-Promoted Metal-Free Synthesis of (Hetero)Aromatic Nitriles from C(sp³)-H Bonds was written by Murugesan, Kathiravan;Donabauer, Karsten;Koenig, Burkhard. And the article was included in Angewandte Chemie, International Edition in 2021.Computed Properties of C10H12O3 This article mentions the following:

The metal-free activation of C(sp³)-H bonds to value-added products is of paramount importance in organic synthesis. We report the use of the com. available organic dye 2,4,6-triphenylpyrylium tetrafluoroborate (TPP) for the conversion of methylarenes to the corresponding aryl nitriles via a photocatalytic process. Applying this methodol., a variety of cyanobenzenes have been synthesized in good to excellent yield under metal- and cyanide-free conditions. We demonstrate the scope of the method with over 50 examples including late-stage functionalization of drug mols. (celecoxib) and complex structures such as L-menthol, amino acids, and cholesterol derivatives Furthermore, the presented synthetic protocol is applicable for gram-scale reactions. In addition to methylarenes, selected examples for the cyanation of aldehydes, alcs. and oximes are demonstrated as well. Detailed mechanistic investigations have been carried out using time-resolved luminescence quenching studies, control experiments, and NMR spectroscopy as well as kinetic studies, all supporting the proposed catalytic cycle. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Computed Properties of C10H12O3).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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. 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.Computed Properties of C10H12O3

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

Novel Cambinol Analogs as Sirtuin Inhibitors: Synthesis, Biological Evaluation, and Rationalization of Activity was written by Medda, Federico;Russell, Rupert J. M.;Higgins, Maureen;McCarthy, Anna R.;Campbell, Johanna;Slawin, Alexandra M. Z.;Lane, David P.;Lain, Sonia;Westwood, Nicholas J.. And the article was included in Journal of Medicinal Chemistry in 2009.SDS of cas: 33166-79-9 This article mentions the following:

The tenovins and cambinol are two classes of sirtuin inhibitor that exhibit antitumor activity in preclin. models. This report describes modifications to the core structure of cambinol, in particular by incorporation of substituents at the N1-position, which lead to increased potency and modified selectivity. These improvements have been rationalized using mol. modeling techniques. The expected functional selectivity in cells was also observed for both a SIRT1 and a SIRT2 selective analog. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9SDS of cas: 33166-79-9).

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

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

The organocatalytic highly enantioselective Knoevenagel condensation: applications in the synthesis of various chiral amide derivatives was written by Ashokkumar, Veeramanoharan;Siva, Ayyanar;Sankar, Balakrishnan. And the article was included in Journal of the Iranian Chemical Society in 2019.Application of 1190-39-2 This article mentions the following:

In this work, efficient organocatalysts were designed, synthesized and successfully applied to the Knoevenagel condensation. In this reaction, different α-branched aldehydes were treated with various malonate compounds to give the desired unsaturated diester products [R¹ = H, 4-Me, 3-F, etc.; R² = Me, Et, Bn, etc.] up to 97% yield and excellent e.r up to 99.68:0.32 under the mild reaction conditions. Moreover, the Knoevenagel product, unsaturated diesters I was converted into different chiral amide derivatives II [R³ = n-BuNH, PhNH, N-morpholinyl, pyrrolidin-1-yl, 4-pyridylamino] in higher enantioselectivity. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Application 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. 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.Application of 1190-39-2

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

Nitrosoallene-Mediated endo-Cyclizations for the Synthesis of (Hetero)cyclic α-Substituted exo-Unsaturated Oximes was written by Tanimoto, Hiroki;Ueda, Sho;Morimoto, Tsumoru;Kakiuchi, Kiyomi. And the article was included in Journal of Organic Chemistry in 2018.Related Products of 17920-23-9 This article mentions the following:

Nitrosoallene-mediated endo-dig cyclization reactions producing (hetero)cyclic exo-unsaturated oximes (enoximes) are described. The intramol. 1,4-type addition to in situ generated nitrosoallenes afforded α-substituted cyclic enoximes with exo-methylene units, which are the favored conformation for further cyclizations. The strong electron-withdrawing ability of the nitroso group facilitated the construction of five-to-seven-membered ring systems via C-O, C-N, C-S, and C-C bond formations, including a quaternary carbon center, at low temperatures In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Related Products of 17920-23-9).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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.Related Products of 17920-23-9

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

Study on the key volatile compounds and aroma quality of jasmine tea with different scenting technology was written by An, Huimin;Ou, Xingchang;Zhang, Yangbo;Li, Shi;Xiong, Yifan;Li, Qin;Huang, Jianan;Liu, Zhonghua. And the article was included in Food Chemistry in 2022.Computed Properties of C9H10O3 This article mentions the following:

The aroma quality of jasmine tea refers to the strength and freshness of jasmine fragrance and its coordination with tea aroma, which is regulated by various volatile compounds In this study, seventy volatile compounds of jasmine tea scented by different scenting technol. were analyzed qual. and quant. by gas chromatog.-mass spectrometry (GC-MS). And seven compounds were identified as the key volatile compounds by weighted gene co-expression network anal. (WGCNA), orthogonal partial least squares discriminant anal. (OPLS-DA) and odor activity value (OAV). According to the equation describing seven key volatile compounds and quality of jasmine tea, the optimal scenting technol. was obtained, i.e., the amount of flowers (AF) was 65-78%, scenting time (ST) was 15-17 h, and scenting temperature (SW) was 35-40°C. This study lays a foundation for the study of aroma characteristics of jasmine tea, and guides enterprises to improve jasmine tea processing technol. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Computed Properties of C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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.Computed Properties of C9H10O3

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

Molecular background of the undesired odor of polypropylene materials and insights into the sources of key odorants was written by Frank, Stephanie;Reglitz, Klaas;Mall, Veronika;Morgenstern, Ute;Steinhaus, Martin. And the article was included in Indoor Air in 2021.Reference of 706-14-9 This article mentions the following:

Screening the volatiles isolated from a standard polypropylene material consisting of a polypropylene homopolymer, the filler talcum, and a mixture of antioxidants, for odor-active compounds by application of an aroma extract dilution anal. revealed 30 odorants with flavor dilution factors ranging from 1 to 64. Eighteen odor-active compounds were subsequently quantitated by gas chromatog.-mass spectrometry using stable isotopically substituted odorants as internal standards, and their odor activity values (OAVs) were calculated as ratios of the concentrations to the odor threshold values. Five odorants showed OAVs >1, among which were hex-1-en-3-one (OAV 12), butanoic acid (OAV 3), as well as 4-methylphenol, butan-1-ol, and 2-tert-butylphenol (all OAV 1). A comparative anal. of polypropylene materials with different additives suggested plastic-like, pungent smelling hex-1-en-3-one as an ubiquitous key odorant. Odor-active amounts of alkylphenols, in particular plastic-like, phenolic smelling 2-tert-butylphenol, were addnl. formed in the presence of talcum and phenolic antioxidants. Whereas the precursors of the phenols were thus obvious, the origin of hex-1-en-3-one was unknown. Injection molding showed only little influence on odorant concentrations In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Reference of 706-14-9).

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. 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.Reference of 706-14-9

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

Analysis of aromatic components of two edible mushrooms, Phlebopus portentosus and Cantharellus yunnanensis using HS-SPME/GC-MS was written by Tian, Run;Liang, Zhi-Qun;Wang, Yong;Zeng, Nian-Kai. And the article was included in Results in Chemistry in 2022.Formula: C6H10O2 This article mentions the following:

A headspace solid-phase microextraction (HS-SPME) coupled with gas chromatog.-mass spectrometry (GC-MS) was used to evaluate the profile of the volatile components that accounted for the aroma of two edible mushrooms, viz. Phlebopus portentosus and Cantharellus yunnanensis. There were 51 and 69 volatile compounds identified from P. portentosus and C. yunnanensis, resp. These compounds were mainly acids, hydrocarbons, ketones, esters, aldehydes, and alcs., of which acetic acid was most abundant among these volatile components. Onanoic acid, 9-oxo-, Me ester, 2-pentyl-furan, and 5, 6-dihydro-2-pyranone were discovered in the mushrooms for the first time, and the volatile compounds of C. yunnanensis was also investigated for the first time. In addition, the volatile compounds of P. portentosus and C. yunnanensis were analyzed by principal components anal. (PCA). The findings reveal the differences among samples and provide the basic data for the chemotaxonomy in studying P. portentosus and C. yunnanensis. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Formula: C6H10O2).

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

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

Synthesis and antibacterial evaluation of sulbactam derivatives against Acinetobacter baumannii was written by Yang, Yuanshuai;Tang, Sheng;Liu, Zhandong;Wang, Yanxiang;Pang, Jing;You, Xuefu;Song, Danoing;Li, Yinghong;Lu, Xi. And the article was included in Pharmazie in 2018.Application In Synthesis of 3-Cyanophenylisocyanate This article mentions the following:

Sulbactam, a known β-lactamase inhibitor, was found to own potent antimicrobial activity against Acinetobacter baumannii in clin. practice. Based on clin. evidence, a series of sulbactam derivatives I [R = H, NH₂, 3-ClC₆H₄NHC(O)NH, etc.; R¹ = H, Na, 2-O₂NC₆H₄CH₂, etc.] and II [R² = H, Na, NHEt₃; R³ = H, NH₂, 3-MeC₆H₄NHC(O)NH, etc.] were designed, synthesized and evaluated for antibacterial activity against Acinetobacter baumannii, taking sulbactam as the lead. Among them, compound II [R² = Na; R³ = H (III)] exhibited a good antibacterial activity against Acinetobacter baumannii with a MIC value of 4 μg/mL, slightly lower than that of sulbactam of 1 μg/mL. Especially, compound III displayed outstanding oral pharmacokinetic profiles with a maximum plasma concentration (C_max) of 19.6 μg/mL and area under the curve (AUC) of 10.8 μgh/mL, much higher than those of sulbactam, and thus held the potential of being developed into an oral medication. These results provided the useful information for further structural modification and optimization of its kind, and compound III had been selected for the further investigation. In the experiment, the researchers used many compounds, for example, 3-Cyanophenylisocyanate (cas: 16413-26-6Application In Synthesis of 3-Cyanophenylisocyanate).

3-Cyanophenylisocyanate (cas: 16413-26-6) 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.Application In Synthesis of 3-Cyanophenylisocyanate

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

Metagenomics reveals flavour metabolic network of cereal vinegar microbiota was written by Wu, Lin-Huan;Lu, Zhen-Ming;Zhang, Xiao-Juan;Wang, Zong-Min;Yu, Yong-Jian;Shi, Jin-Song;Xu, Zheng-Hong. And the article was included in Food Microbiology in 2017.Formula: C11H14O3 This article mentions the following:

Multispecies microbial community formed through centuries of repeated batch acetic acid fermentation (AAF) is crucial for the flavor quality of traditional vinegar produced from cereals. However, the metabolism to generate and/or formulate the essential flavours by the multispecies microbial community is hardly understood. Here we used metagenomic approach to clarify in situ metabolic network of key microbes responsible for flavor synthesis of a typical cereal vinegar, Zhenjiang aromatic vinegar, produced by solid-state fermentation First, we identified 3 organic acids, 7 amino acids, and 20 volatiles as dominant vinegar metabolites. Second, we revealed taxonomic and functional composition of the microbiota by metagenomic shotgun sequencing. A total of 86 201 predicted protein-coding genes from 35 phyla (951 genera) were involved in Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways of Metabolism (42.3%), Genetic Information Processing (28.3%), and Environmental Information Processing (10.1%). Furthermore, a metabolic network for substrate breakdown and dominant flavor formation in vinegar microbiota was constructed, and microbial distribution discrepancy in different metabolic pathways was charted. This study helps elucidating different metabolic roles of microbes during flavor formation in vinegar microbiota. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Formula: C11H14O3).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. 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.Formula: C11H14O3

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