Category: esters-buliding-blocks

Screening and characteristic aroma analysis of aroma-producing yeasts in high-temperature Daqu was written by Lu, Yan-xiang;Liang, Hui-zhen;Chen, Peng;Liu, Zheng;Zhong, Cheng. And the article was included in Shipin Yanjiu Yu Kaifa in 2021.Computed Properties of C10H18O2 This article mentions the following:

Two yeast strains characterized by high aroma production, namely Y3 and Y5, were obtained from the high-temperature Daqu. After separation and purification, primary screening for aroma production using liquid fermentation, and secondary screening using solid fermentation were performed. Headspace solid-phase microextraction-gas chromatog.-mass spectrometry (HS-SPME-GC-MS) was employed to detect and analyze the products obtained after solid-state fermentation of Y3 and Y5. As a result, 43 and 37 volatile aroma compounds were recovered from Y3 and Y5, resp. The main aroma producing compounds among the products obtained after Y3 solid-state fermentation were 灏?phenethyl alc., isoamyl alc., isovaleric acid, and Et butyrate, and those obtained after Y5 solid-state fermentation were 灏?phenylethanol, 4-vinylguaiacol, and isoamyl alc. acid. Based on the morphol., physiol., and biochem. examinations, and mol. identification, Y3 was identified as Saccharomycopsis fibuligera, and Y5 was identified as Wickerhamomyces anomalus. Thereafter, Y3 and Y5 were mixed in equal proportions, and added to the Maotai-flavored liquor fermented grains to simulate the production and fermentation, and then the distilled liquor samples were examined using gas chromatog. (GC) for skeleton composition The results revealed that both Y3 and Y5 significantly increased the levels of Et acetate, Et lactate, and 灏?phenylethanol in liquor. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Computed Properties of C10H18O2).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) 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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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. Computed Properties of C10H18O2

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

Fracture Toughness of Polymer Interfaces Compatibilized with Nanoparticle Brushes was written by Alkhodairi, Husam;Kumar, Sanat K.. And the article was included in Macromolecules (Washington, DC, United States) in 2022.Electric Literature of C73H108O12 This article mentions the following:

Surface-active particles at immiscible polymer/polymer interfaces can provide unparalleled stability against droplet coalescence. However, they often deteriorate the fracture toughness (G_c) of the interface because their rigid cores act as stress concentrators. Here, we draw on the knowledge developed for the interfacial strengthening mechanisms of block and random copolymers to design analogous particle-based systems. We use silica nanoparticles “grafted-from” with poly(styrene-r-Me methacrylate) (PS-r-PMMA) chains to strengthen PS/PMMA interfaces. In this manner, the silica cores suppress droplet coalescence, while the PS-r-PMMA grafts entangle with the homopolymers and transmit stress across the interface. Interestingly, we show that G_c for the interfaces compatibilized with these particle brushes can exceed that of the interfaces compatibilized with ungrafted copolymer analogs. Rheol. experiments attribute this phenomenon to increased connectivity between the entanglement points in these hybrid particle brush systems. 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 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. 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 C73H108O12

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

Prediction of infinite-dilution activity coefficients with neural collaborative filtering was written by Tan, Tian;Cheng, Hongye;Chen, Guzhong;Song, Zhen;Qi, Zhiwen. And the article was included in AIChE Journal in 2022.Related Products of 84-61-7 This article mentions the following:

Accurate prediction of infinite dilution activity coefficient (绾?sup>閳?/sup>) for phase equilibrium and process design is crucial. In this work, an exptl. 绾?sup>閳?/sup> dataset containing 295 solutes and 407 solvents (21,048 points) is obtained through data integrating, cleaning, and filtering. The dataset is arranged as a sparse matrix with solutes and solvents as columns and rows, resp. Neural collaborative filtering (NCF), a modern matrix completion technique based on deep learning, is proposed to fully fill in the 绾?sup>閳?/sup> matrix. Ten-fold cross-validation is performed on the collected dataset to test the effectiveness of the proposed NCF, proving that NCF outperforms the state-of-the-art phys. model and previous machine learning model. The completed 绾?sup>閳?/sup> matrix makes solvent screening and extension of UNIFAC parameters possible. Taking two typical hard-to-sep. systems (benzene/cyclohexane and Me cyclopentane/n-hexane mixtures) as examples, the NCF-developed database provides high-throughput screening for separation systems in terms of solvent selectivity and capacity. In the experiment, the researchers used many compounds, for example, Dicyclohexyl phthalate (cas: 84-61-7Related Products of 84-61-7).

Dicyclohexyl phthalate (cas: 84-61-7) 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is 绾?valerolactone.Related Products of 84-61-7

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

Utilization of an Active Site Mutant Receptor for the Identification of Potent and Selective Atypical 5-HT_2C Receptor Agonists was written by Carpenter, Joseph;Wang, Ying;Wu, Gang;Feng, Jianxin;Ye, Xiang-Yang;Morales, Christian L.;Broekema, Matthias;Rossi, Karen A.;Miller, Keith J.;Murphy, Brian J.;Wu, Ginger;Malmstrom, Sarah E.;Azzara, Anthony V.;Sher, Philip M.;Fevig, John M.;Alt, Andrew;Bertekap, Robert L.;Cullen, Mary Jane;Harper, Timothy M.;Foster, Kimberly;Luk, Emily;Xiang, Qian;Grubb, Mary F.;Robl, Jeffrey A.;Wacker, Dean A.. And the article was included in Journal of Medicinal Chemistry in 2017.Synthetic Route of C8H11NO2 This article mentions the following:

Agonism of the 5-HT_2C receptor represents one of the most well-studied and clin. proven mechanisms for pharmacol. weight reduction Selectivity over the closely related 5-HT_2A and 5-HT_2B receptors is critical as their activation has been shown to lead to undesirable side effects and major safety concerns. In this communication, we report the development of a new screening paradigm that utilizes an active site mutant D134A (D3.32) 5-HT_2C receptor to identify atypical agonist structures. We addnl. report the discovery and optimization of a novel class of nonbasic heterocyclic amide agonists of 5-HT_2C. SAR investigations around the screening hits provided a diverse set of potent agonists at 5-HT_2C with high selectivity over the related 5-HT_2A and 5-HT_2B receptor subtypes. Further optimization through replacement of the amide with a variety of five- and six-membered heterocycles led to the identification of 6-(1-ethyl-3-(quinolin-8-yl)-1H-pyrazol-5-yl)pyridazin-3-amine (69). Oral administration of 69 to rats reduced food intake in an ad libitum feeding model, which could be completely reversed by a selective 5-HT_2C antagonist. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Synthetic Route of C8H11NO2).

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 绾?valerolactone.Synthetic Route of C8H11NO2

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

A sustainable high-viscosity modified asphalt modified with multiple anti-aging agents: Micro-chemical analysis and macro-rheological characterization was written by Hu, Mingjun;Ling, Senlin;Sun, Daquan;Lu, Tong;Ma, Jianmin;Sun, Yu. And the article was included in Construction and Building Materials in 2022.Category: esters-buliding-blocks This article mentions the following:

This study aimed to use aging inhibition technol. to actively improve the environmental aging resistance, thus achieving the sustainable and long-life application of high-viscosity modified asphalt (HVMA). The sustainable HVMAs with different anti-aging agents was prepared, and the long-term environmental aging effect, including solar radiation, heat, and moisture, was simulated using the accelerated environmental aging tester. Then, the chem. and mol. composition of sustainable HVMAs were investigated using Fourier transform IR spectroscopy test, XPS test, and gel permeation chromatog. test. Afterwards, the nano-indentation test was used to study the nanomech. property of sustainable HVMAs. Finally, the dynamic shear rheol. test and linear amplitude sweep test were applied to evaluate the aging resistance, crack resistance, and fatigue resistance of sustainable HVMAs. The results show that environmental aging leads to the rapid oxidation of asphalt mols. and substantial degradation of polymer mols. in HVMA, as evidenced by the transformation of carbon elements from C-C/C-H bonds to C-O/C=O bonds and sulfur elements from C-S-C bonds to S=O/O=S=O bonds. A single anti-aging agent has a little aging inhibition effect, while the compounding of multiple anti-aging agents has a synergistic anti-aging enhancement effect. The combination of UV absorbers and UV blocking agents can absorb/reflect some of the UV rays and delay the UV aging process. However, they cannot effectively prevent the binding of UV-excited reactive radicals with oxygen. In contrast, incorporating antioxidants can allow hydrogen atoms to combine with UV-excited reactive radicals and prevent further oxidation of asphalt mols. The compound incorporation of UV absorbers, UV blocking agents, and antioxidants can improve the rheol. property, crack resistance, and fatigue resistance of aged HVMA, thus effectively promoting the sustainable and long-life application of HVMA. 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: 6683-19-8Category: esters-buliding-blocks).

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 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. 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

Physico-chemical parameters and antioxidant activity of Romanian sea buckthorn berries was written by Ion, Violeta Alexandra;Parvulescu, Oana Cristina;Velcea, Diana;Popa, Oana;Ahmadi, Mirela. And the article was included in Revista de Chimie (Bucharest, Romania) in 2019.Reference of 659-70-1 This article mentions the following:

Physico-chem. parameters of Romanian sea buckthorn fresh or dried berries, including titratable acidity (2.28 鍗?0.06 g malic acid/100 g FM), pH (2.60 鍗?0.08), contents of moisture (75.94 鍗?2.14 g/100 g FM), ash (2.83 鍗?0.11 g/100 g DM), ascorbic acid (1337.6 鍗?37.2 mg/100 g FM), oil (3.82 鍗?0.16 g/100 g FM), and macro elements, mainly K (11654 mg/kg DM), Mg (668 mg/kg DM), Ca (645 mg/kg DM), Na (401 mg/kg DM), and P (271 mg/kg DM), were evaluated in this paper. The most abundant volatile compounds found in the volatile fraction of berries were isopentyl isovalerate (30.8%), heptanal (11.7%), Et hexanoate (10.5%), Et isovalerate (8.1%), hexanal (7.5%), and Et 2-methylbutyrate (6.3%). Total phenolic content, total flavonoids content, and antioxidant activity (expressed as DPPH free radical scavenging activity by inhibition of DPPH) of extract solutions obtained from dried berries by MAE using ethanol/water mixture as a solvent were estimated at different ratios of solvent volume/vegetal material mass (15-30 mL/g) and ethanol/water (50/50, 60/40, 70/30, and 80/20 volume/volume). Inhibition of DPPH (22.61-48.60%) was well correlated with total phenolic content (4.42-10.04 mg caffeic acid equivalent/g DM) and total flavonoids content (5.37-11.14 mg quercetin equivalent/g DM). In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Reference of 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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 绾?valerolactone.Reference of 659-70-1

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

2-Aminonicotinic Acid 1-Oxides Are Chemically Stable Inhibitors of Quinolinic Acid Synthesis in the Mammalian Brain: A Step toward New Antiexcitotoxic Agents was written by Vallerini, Gian Paolo;Amori, Laura;Beato, Claudia;Tararina, Margarita;Wang, Xiao-Dan;Schwarcz, Robert;Costantino, Gabriele. And the article was included in Journal of Medicinal Chemistry in 2013.Reference of 14667-47-1 This article mentions the following:

3-Hydroxyanthranilic acid 3,4-dioxygenase (3-HAO) is the enzyme responsible for the production of the neurotoxic tryptophan metabolite quinolinic acid (QUIN). Elevated brain levels of QUIN are observed in several neurodegenerative diseases, but pharmacol. investigation on its role in the pathogenesis of these conditions is difficult because only one class of substrate-analog 3-HAO inhibitors, with poor chem. stability, has been reported so far. Here we describe the design, synthesis, and biol. evaluation of a novel class of chem. stable inhibitors based on the 2-aminonicotinic acid 1-oxide nucleus. After the preliminary in vitro evaluation of newly synthesized compounds using brain tissue homogenate, we selected the most active inhibitor and showed its ability to acutely reduce the production of QUIN in the rat brain in vivo. These findings provide a novel pharmacol. tool for the study of the mechanisms underlying the onset and propagation of neurodegenerative diseases. In the experiment, the researchers used many compounds, for example, Methyl 2-aminonicotinate (cas: 14667-47-1Reference of 14667-47-1).

Methyl 2-aminonicotinate (cas: 14667-47-1) 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.Reference of 14667-47-1

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

Synthesis and conversions of some 浼?hydroxyisobutyric acid esters was written by Kuz’michev, O. V.;Ustavshchikov, B. F.;Farberov, M. I.. And the article was included in Zhurnal Organicheskoi Khimii in 1968.Computed Properties of C11H14O3 This article mentions the following:

Reaction of Me2C(OH)CO2Na (I) with organic halides gave esters Me2C(OH)CO2R (II), which on dehydration gave H2C:CMeCO2R (III), of possible interest as polymerization monomers. Preparation of II was carried out either by heating the reagents in HCONMe2 or by fusing them together. Dehydration was done by heating II, containing 1-5% Cu-hydroquinone complex (a polymerization inhibitor) at 60-80鎺?in C6H6, PhMe, or xylene with PCl5. The following II and III were prepared (R, % yield, b.p./mm., n20D, and d20 of II and % yield, b.p./mm., n20D, and d20 of III given): H2C:CHCH2, 99.0, 166鎺?760, 1.4311, 1.0040, 40.0, 141鎺?760, 1.4330, 0.9300; H2C:CMeCH2, 88.0, 179鎺?760, 1.4338, 0.9870, 21.0, 70鎺?25, 1.4386, 0.9250; PhCH2, 84.5, 125鎺?10, 1.5010, 1.0860, 16.5, 236鎺?760, 1.5145, 1.0480; 2,4-Me2C6H3CH2, 97.0, 146鎺?5, 1.5051, 1.0650, 23.0, 115鎺?2, 1.5130, 1.0230; p-PhOC6H4CH2, 97.0, 173-5鎺?2, 1.5540, 1.1700, 16.5, 138鎺?1, 1.5760, 1.1589. Reaction of 1,5-bis(chloromethyl)-2,4-dimethylbenzene or (p-ClCH2C6H4)2O with I gave 99.0% 1,5-bis(浼?hydroxyisobutyryloxymethyl)-2,4-dimethylbenzene, m. 73.5, and 99.0% p-Me2C(OH)CO2CH2C6H4)2O, b1.5 220鎺? n20D 1.5470, d20 1.2190, which were dehydrated to give 31.5% 1,5-bis(methacryloxymethyl)-2,4-dimethylbenzene, b1 140-5鎺? n20D 1.5336, d20 1.1609, and 40.0% (p-H2C:CHCO2CH2C6H4)2O, b1 180鎺? n20D 1.5695, d20 1.1900. Passage of II vapors over a Ca phosphate catalyst at high temperature gave simultaneous dehydration and hydrolysis to H2C:CMeCO2H and the corresponding alcs. or dialcs. In the experiment, the researchers used many compounds, for example, Benzyl 2-hydroxy-2-methylpropanoate (cas: 19444-23-6Computed Properties of C11H14O3).

Benzyl 2-hydroxy-2-methylpropanoate (cas: 19444-23-6) 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 C11H14O3

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

Preparative synthesis of vanillin and vanillal alkanoates was written by Dikusar, E. A.;Vyglazov, O. G.;Moiseichuk, K. L.;Zhukovskaya, N. A.;Kozlov, N. G.. And the article was included in Russian Journal of Applied Chemistry in 2005.COA of Formula: C12H14O4 This article mentions the following:

Vanillin and its homolog, vanillal are widely used in food and perfume industries. New processes in the food industry demand new aroma chems. that would have vanilla smell but be more heat-resistant than vanillin and stable in a wide range of pH in the presence of enzymes. Procedures for preparing vanillin and vanillal alkanoates were then developed. These compounds are of interest as components of flavor food additives with popular chocolate, caramel, and milk-cream smells. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4COA of Formula: C12H14O4).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) 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.COA of Formula: C12H14O4

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

Development of a Practical and Scalable Synthesis of (R)- and (S)-3-Amino-2-[(benzyloxy)methyl]propan-1-ol Monohydrochloride: A Useful C-4 Chiral Building Block was written by Yoshida, Shinya;Obitsu, Kazuyoshi;Hayashi, Yasumasa;Shibazaki, Mitsuyoshi;Kimura, Takenori;Takahashi, Takumi;Asano, Toru;Kubota, Hirokazu;Mukuta, Takashi. And the article was included in Organic Process Research & Development in 2012.Related Products of 82962-54-7 This article mentions the following:

The development of a practical and scalable synthesis of a C-4 chiral amine building block (R)-1璺疕Cl and (S)-1璺疕Cl is described. This important chiral intermediate (R)-1璺疕Cl is efficiently synthesized from the com. available, inexpensive, and simple 2-(hydroxymethyl)-1,3-propanediol using lipase-catalyzed enantioselective hydrolysis as a key reaction. Development resulted in a telescoped process that was operated successfully and reproducibly in a pilot-plant-scale synthesis, and 22 kg of chiral amine (R)-1璺疕Cl was prepared in the first scale-up synthesis. This synthetic method is also useful for preparation of the important chiral building block (S)-1璺疕Cl, which is the enantiomer of (R)-1璺疕Cl. In the experiment, the researchers used many compounds, for example, Ethyl 2,2-dimethyl-1,3-dioxane-5-carboxylate (cas: 82962-54-7Related Products of 82962-54-7).

Ethyl 2,2-dimethyl-1,3-dioxane-5-carboxylate (cas: 82962-54-7) 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. 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.Related Products of 82962-54-7

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