Category: esters-buliding-blocks

Controlled radical polymerization of N-vinylpyrrolidone and N-vinylsuccinimide under the conditions of reversible chain transfer by the addition-fragmentation mechanism was written by Chernikova, E. V.;Terpugova, P. S.;Filippov, A. N.;Garina, E. S.;Golubev, V. B.;Gostev, A. I.;Sivtsov, E. V.. And the article was included in Russian Journal of Applied Chemistry in 2009.Synthetic Route of C14H12S2 This article mentions the following:

Regular trends in controlled radical polymerization of N-vinylpyrrolidone and N-vinylsuccinimide by the mechanism of reversible chain transfer in the presence of a series of dithiobenzoates and trithiocarbonates were studied. The possibility of preparing soluble poly-N-vinylsuccinimide in concentrated solutions using benzyl benzodithioate as reversible chain-transfer agent was demonstrated. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Synthetic Route of C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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 C14H12S2

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

Aroma profiles of green tea made with fresh tea leaves plucked in summer was written by Guo, Xiangyang;Ho, Chi-Tang;Schwab, Wilfried;Wan, Xiaochun. And the article was included in Food Chemistry in 2021.COA of Formula: C12H22O4 This article mentions the following:

There is a claim that fresh tea leaves plucked in summer (FTL-S) are not suitable for green tea processing, but there is no scientific evidence to support this claim. The aroma properties of green tea (GT-S) made with FTL-S were studied by the anal. of volatiles during process, coupled with odor activity value (OAV) determination The odor profiles of dry tea and tea infusion were investigated by sensory evaluation. The GT-S contained higher proportions of alcs., alkenes and heterocyclic compounds with strong fragrance and nutty odors as well as moderate floral odor in comparison with FTL-S. β-Damascenone and 2-ethyl-3,5-dimethylpyrazine with the OAV of 54,290 and 1.15, resp., were the aroma-active compounds imparting woody and nutty odors in GT-S, resp. Current study provides an alternative way to use FTL-S for green tea production, and we also found that L-theanine is an important aroma precursor for the formation of green tea aroma. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6COA of Formula: C12H22O4).

Dimethyl decanedioate (cas: 106-79-6) 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. COA of Formula: C12H22O4

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

Synthesis and antibacterial activity of emodin and its derivatives against methicillin-resistant Staphylococcus aureus was written by Chalothorn, Thidarat;Rukachaisirikul, Vatcharin;Phongpaichit, Souwalak;Pannara, Sakawrat;Tansakul, Chittreeya. And the article was included in Tetrahedron Letters in 2019.Application In Synthesis of Methyl 2-methoxy-4-methylbenzoate This article mentions the following:

Synthesis of the antibacterial emodin (I) was improved using Friedel-Crafts acylation as a key step leading to 37% overall yield. In addition, 21 analogs were synthesized by structural modification of the hydroxyl and Me groups, as well as the aromatic ring of emodin. Antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA) and cytotoxicity against noncancerous Vero cells were evaluated. A structure-activity relationship (SAR) study indicated that the hydroxyl groups and the Me group in the emodin skeleton were crucial for anti-MRSA activity. Furthermore, the presence of an iodine atom or ethylamino group on the aromatic ring enhanced the anti-MRSA activity with higher selectivity indexes, while derivatives containing bromine, chlorine atoms or quaternary ammonium salt were as active as emodin. The quaternary ammonium group on the aromatic ring also led to non-cytotoxicity against Vero cells. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Application In Synthesis of Methyl 2-methoxy-4-methylbenzoate).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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 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.Application In Synthesis of Methyl 2-methoxy-4-methylbenzoate

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

Direct and indirect monomer elution from an RBC product family was written by Durner, Juergen;Schrickel, Klaus;Watts, David C.;Becker, Marc;Draenert, Miriam E.. And the article was included in Dental Materials in 2021.Computed Properties of C20H26O4 This article mentions the following:

To develop a model for quant. comparison of elutable substances by direct elution from resin-bonded composite (RBC) test specimens vs. indirect elutability of substances from RBC-restored teeth. Furthermore, it was to be investigated whether the different composites of the Tetric RBC product family release different types and amounts of substances.Four different composite materials from the Tetric product family were studied. For each material subgroup ten human third molar teeth were prepared with standard Class-I occlusal cavities. These ′tooth group′ specimens were provided with a three-step adhesive system (incorporating TEGDMA) and the resp. composite restoration. Same sized control specimens, of each RBC restorative material, were prepared (′direct RBC′ groups). All specimens were placed in individual elution chambers such that the elution media (ethanol/water, 3:1) only came into contact with either the tooth root or 3/4 height of the ′direct RBC′ materials. They were incubated at 37 °C for up to 7 d. Samples of the eluant were taken after 1, 2, 4 and 7 d and were analyzed by high-temperature gas chromatog./mass spectrometry.Bisphenol A ethoxylate dimethacrylate (bisEMA), bisphenol A glycidyldimethacrylate (bisGMA), tetraethylene glycol dimethacrylate (TEEGDMA), decan-1,10-diol dimethacrylate (DDDMA) were mostly found in the eluates of the ′direct RBC′ groups in statistically significantly greater amounts than in the eluates of the ′tooth groups′. Such quant. differences were also the case with eluates containing bisphenol A (BPA), dicyclohexyl phthalate (DCHP) and drometrizole, which are common in the environment. In contrast to the behavior found with all the other monomers, up to 3 orders of magnitude more triethylene glycol dimethacrylate (TEGDMA) was found in the ′tooth groups′ compared to the ′direct RBC′ groups, evidently released by the adhesive system.The release of most of the substances was clearly delayed in the ′tooth groups′ indicative of their chronic, rather than acute, elution to the oral environment. A barrier function of the residual dentin layer and the adhesion layer can be inferred. The different release patterns of substances from the various composites of the RBC product family is a manifestation of their different and indication-specific compositions Consideration of an overall restorative care (RBC plus adhesive) system, when assessing the total amount of released substances, is emphasized. 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 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.Computed Properties of C20H26O4

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

New amphiphilic platinum(II) phthalocyanine with peracetylated β-galactose moiety – Synthesis and photophysical properties was written by Volov, Alexander N.;Volov, Nikolai A.;Burtsev, Ivan D.. And the article was included in Polyhedron in 2021.Recommanded Product: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate This article mentions the following:

The synthesis of new glycoconjugated phthalonitrile connected with galactose moiety by triazole spacer via Cu(II)-mediated click reaction is reported. Reaction of azido derivatives of β-D-galactopyranose tetraacetate with 4-O-propargyloxy-substituted phthalonitrile in presence copper(II) sulfate pentahydrate and sodium L-ascorbate in tert-butanol/water gave desired glycophthalonitrile with 79% yield. Obtained phthalonitrile underwent mixed-cyclization with the 4-tert-butyl-substituted phthalonitrile, to afford the mono-glycosylated platinum(II) phthalocyanine. Upon irradiation these compounds could sensitize the formation of singlet oxygen in acetone, with 0.90 quantum yield by method with use of 1,3-diphenylisobenzofuran (DPBF) as scavenger. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Recommanded Product: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) 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. 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: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate

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

Changes of apple fruit volatile profiles induced by fresh bruise at early stage was written by Chen, Qing;Qin, Wenhao;She, Mengqi;Chen, Siyu;Wang, Fang;Tan, Zuojun. And the article was included in Journal of Food and Nutrition Research (Bratislava, Slovakia) in 2021.Quality Control of Methyl2-methylbutyrate This article mentions the following:

Fresh bruise of apple is a major postharvest problem, which is easily ignored at early stage and can develop into more serious external bruise as the time goes on. In this study, we investigated changes of volatile organic compounds (VOCs) profile of apples with fresh bruise during 0-24 h. For this purpose, headspace solid-phase microextraction (HS-SPME) combined with gas chromatog.-mass spectrometry (GC-MS) was used. A total of 43 aroma compounds were identified in apple, consisting of 8 carbonyl compounds, 23 esters, 5 alcs., 5 terpenes and 2 other compounds The data of VOCs were subjected to partial least squares discriminant anal., which showed that 12 h might be the optimum time for apple quality maintenance after fresh bruise. The content of VOCs in bruised tissues showed a significant increase, while they were basically unchanged in healthy tissues. The content of carbonyl compounds increased during 0-24 h, in particular C6 and C9 aldehydes. The content of (3E,6E)-3,7,11-trimethyldodeca-1,3,6,10-tetraene was increased. The results of this study may help top to understand the metabolic disorder and quality maintenance after fresh bruise in apple fruits. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Quality Control of Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) 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 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. Quality Control of Methyl2-methylbutyrate

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

Synthesis of azide-fluoro-dehydrocoelenterazine analog as a photoaffinity-labeling probe and photolysis of azide-fluoro-coelenterazine was written by Kuse, Masaki;Doi, Issei;Kondo, Nobuhiro;Kageyama, Yukari;Isobe, Minoru. And the article was included in Tetrahedron in 2005.SDS of cas: 587-88-2 This article mentions the following:

A photosensitive azide-fluoro-dehydrocoelenterazine analog (Az-F-DCT) was synthesized, starting from 4-fluorophenylacetic acid, as a photoaffinity-labeling probe to analyze symplectin active site. To examine the photo-reactivity of Az-F-DCT, azide-fluoro-coelenterazine analog (Az-F-CT) was used as a potent symplectin chromophore model. Photolysis of Az-F-CT in 2,2,2-trifluoroethanol afforded a nitrene intermediate to give an insertion product. The structure of this product was confirmed through spectroscopic analyses particularly by using a proton/deuterium (H/D) exchange experiment with ESI-Q-TOF-MS and -MS/MS measurement. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2SDS of cas: 587-88-2).

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

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

Effect of microbial communities on the quality characteristics of northeast soybean paste: Correlation between microorganisms and metabolites was written by Yao, Di;Ma, Lixue;Wu, Mengna;Wang, Xiaoyu;Xu, Lei;Yu, Qiaoru;Wang, Changyuan. And the article was included in LWT–Food Science and Technology in 2022.Category: esters-buliding-blocks This article mentions the following:

To systematically explore the impact of microbial community composition on the quality characteristics of northeast soybean paste, the microbial community structure was determined by high-throughput sequencing technol. and the flavor substance, free amino acid (FAA) and biogenic amine (BA) contents were determined by HS-SPME-GC-MS and HPLC. Furthermore, the correlation between microorganisms and metabolites was investigated. The results indicated that the core bacteria mainly included Tetragenococcus, Bacillus and Lactobacillus; Candida_f__norank, Wickerhamomyces and Aspergillus were the dominant fungi. A total of 139 flavor compounds were detected in all samples, and decamethylcyclopentasiloxane, isoamyl phenylacetate and octamethylcyclotetrasiloxane accounted for the highest proportion. A total of 24 FAAs were detected in the soybean paste. Pantoea, Kroppenstedtia and Kocuria were significantly pos. correlated with most FAAs (p < 0.05). Addnl. 5 BAs were detected in the soybean paste, and the contents of BAs in Y4 were highest, which was affected by different microbes. This study provided relevant information for the microbial community composition and metabolites of northeast soybean paste, which was of great significance for understanding the characteristics and safety of soybean paste. 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 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.Category: esters-buliding-blocks

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

Contents of some bioactive compounds in Norway spruce needles as affected by short-term storage at different conditions and implications for their industrial use was written by Sciukaite, Agne;Loziene, Kristina;Labokas, Juozas;Jurkoniene, Sigita. And the article was included in Industrial Crops and Products in 2022.COA of Formula: C12H20O2 This article mentions the following:

The main aim of the research was to evaluate changes in contents of essential oils and pigments in Norway spruce needles as affected by short-term storage under different conditions as well as to assess the potential resources of winter-harvested foliage obtainable from byproducts of forest felling as a natural source of these bioactives. One- and two-year-old needles were taken for the analyses fresh (control) and after five-week storage at three different conditions: at 4°C in fridge, at -24°C in freezer and in the forest of their origin. Essential oils were isolated from needles by hydrodistillation and analyzed by gas chromatog.-mass spectrometry. Analyses of chlorophylls and carotenoids were performed spectrophotometrically. The study showed that none of the tested storage conditions of P. abies needles had significant influence on the total amounts of essential oils in them varying from 0.16% to 0.20% per dry matter (v/w) in two- and one-year-old needles, resp. Bornyl acetate was the main compound identified in the essential oils amounting to 14.47-40.04%. The mean total contents of chlorophylls amounted to 1.10 mg/g in one-year-old needles and to 1.28 mg/g in two-year-old ones measured in fresh weight Statistically significant differences were established in the levels of all the pigments analyzed between fresh material, and stored under controlled, -24°C and 4°C, conditions both of 1-yr-old and 2-yr-old needles. The highest contents of the pigments were obtained after the storage at 4°C as well as under the natural forest condition. Based on the above data and the national forestry statistics, potential yields of essential oils (6.45 kg), total chlorophylls (9.27 kg) and total carotenoids (1.32 kg) were assessed per ha of a mature sprucewood stand in Lithuania. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3COA of Formula: C12H20O2).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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.COA of Formula: C12H20O2

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

Synthesis of bifunctional hydroxamic acids as novel ligands for the hydrophilic stabilization of iron oxide nanoparticles was written by Hofmann, Andreas;Graf, Christina;Kung, Shih-Hao;Kim, Myeongseob;Peng, Xiaogang;El-Aama, Randa;Ruehl, Eckart. And the article was included in Synthesis in 2010.Application of 3903-40-0 This article mentions the following:

A general method for synthesizing bifunctional hydroxamates containing carboxylate or amino functionalities was reported. Various products from simple alkyl to complex dendrimer-like structures were described. Such mols. were used recently in ligand-exchange reactions for the hydrophilic stabilization of originally oleate-protected iron oxide nanoparticles. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Application of 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, 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.Application of 3903-40-0

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