Category: esters-buliding-blocks

Organic-inorganic hybrid catalysts based on ordered porous structures for Michael reaction was written by Kubota, Yoshihiro;Ikeya, Hisanori;Sugi, Yoshihiro;Yamada, Takashi;Tatsumi, Takashi. And the article was included in Journal of Molecular Catalysis A: Chemical in 2006.Product Details of 1190-39-2 This article mentions the following:

Two types of organic-inorganic hybrid base catalysts are prepared for the Michael reaction. Organic-functionalized mol. sieves (OFMSs), particularly “amine-immobilized porous silicates”, are designed based on a common idea of immobilizing active catalytic sites on silicate surface. Silicate-organic composite materials (SOCMs), such as “ordered porous silicate-quaternary ammonium composite materials”, are the precursors of ordered porous silicates obtained during the synthesis. The OFMSs are effective when the supports have large pore volume and/or surface area and the reaction is carried out in polar solvents ethanol and DMF. However, the activity of the OFMSs is considerably low in a non-polar solvent such as benzene. In contrast, the SOCMs are remarkably active in benzene. The organic cation-MCM-41 composite is more active than the composite of an organic cation and a microporous silicate such as zeolite beta and ZSM-12. In the SOCM catalysts, (SiO)₃SiO^–(⁺NR₄) moieties located at the accessible sites are considered to play some important roles. The active species are absent in the liquid phase after the reaction. The recycle of the catalyst was possible without significant loss of activity when the substrates are enough reactive. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Product Details of 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) 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. 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.Product Details of 1190-39-2

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

Jack Chambers’ mixed media paintings from the 1960s and 1970s: Painting technique and condition was written by Helwig, Kate;Thibeault, Marie-Eve;Poulin, Jennifer. And the article was included in Studies in Conservation in 2013.Application of 106-79-6 This article mentions the following:

This study describes the examination and anal. of four mixed media paintings from the 1960s and 1970s by Canadian artist Jack Chambers (1931-1978). The documentary evidence about his materials and methods is summarized and compared with the results of anal. of multilayer paint samples. The combination of Fourier transform IR spectroscopy (FTIR) and gas chromatog.-mass spectrometry (GC-MS) allowed the components of the paint media to be characterized: ortho-phthalate alkyd resins, iso-phthalate alkyd resins, drying oils, dammar, Pinaceae resin, and turpentine were identified in varying proportions. Many pigments and fillers were identified by FTIR and Raman and are enumerated. The effect that Chambers’ complex technique has had on the aging and degradation of the paintings is discussed. The severe cracking of the paint layers in one of the four paintings may be the result of a high proportion of dammar and turpentine diluent mixed with the alkyd paint and may also be related to the type of alkyd resin medium. Different history and environmental conditions may also be factors. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Application of 106-79-6).

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. 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 106-79-6

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

Facile preparation of tungsten oxide doped TiO₂ photocatalysts using liquid phase plasma process for enhanced degradation of diethyl phthalate was written by Ki, Seo Jin;Park, Young-Kwon;Kim, Jung-Sik;Lee, Won-June;Lee, Heon;Jung, Sang-Chul. And the article was included in Chemical Engineering Journal (Amsterdam, Netherlands) in 2019.Name: Ethyl 2-hydroxybenzoate This article mentions the following:

In a present study, tungsten oxide was employed to improve the removal efficiency of the parent compound di-Et phthalate as well as to reduce the band gap energy of the original photocatalyst titanium dioxide. The modified photocatalyst was prepared by depositing tungsten oxide onto titanium dioxide through the liquid phase plasma. The decomposition of the parent compound was examined by varying the loading of tungsten oxide in the photocatalyst surface under different light sources, UV and blue light sources. Results showed that the band gap energy in the modified photocatalyst was lower than that of the original photocatalyst, which was attributed to increased loading of tungsten oxide in the modified photocatalyst surface resulted from an increase in the initial precursor concentrations Tungsten doped in the photocatalyst surface existed in the form of the WO₃, which led to a decrease in the sp. surface area for the modified photocatalyst. The degradation performance of the parent compound increased in response to an increase in the amount of tungsten oxide under blue light, but decreased with increasing the loading of tungsten oxide under UV light. Two intermediates observed during the photocatalytic degradation appeared to be involved in the proposed degradation pathway. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Name: Ethyl 2-hydroxybenzoate).

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. 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.Name: Ethyl 2-hydroxybenzoate

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

Constituents of tropical medicinal plants. Part 31. Flavonoid and other constituents of Bauhinia manca was written by Achenbach, Hans;Stoecker, Markus;Constenla, Manuel A.. And the article was included in Phytochemistry in 1988.Name: Methyl 4-Hydroxy-2-methoxybenzoate This article mentions the following:

Phytochem. anal. of the stem of B. manca yielded 63 compounds, among them 6 new natural products. The new products were identified as 4 flavonoids (isoliquiritigenin 4-Me ether, liquiritigenin 4′-Me ether, 7,3′-dimethoxy-4′-hydroxyflavan, 3′,4′-dihydroxy-7-methoxyflavan) and 2,4′-dihydroxy-4-methoxydihydrochalcone and the lignan (7S,8R,8′R)-5,5′-dimethoxylariciresinol. Major constituents were 3-O-galloylepicatechin, gallic acid, cinnamic acid, β-sitosterol, and its β-D-glucoside. The 2 new flavans possess significant antifungal activity. In the experiment, the researchers used many compounds, for example, Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8Name: Methyl 4-Hydroxy-2-methoxybenzoate).

Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8) 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. 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.Name: Methyl 4-Hydroxy-2-methoxybenzoate

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

Identification of a new p53/MDM2 inhibitor motif inspired by studies of chlorofusin was written by Cominetti, Marco M. D.;Goffin, Sarah A.;Raffel, Ewan;Turner, Kerrie D.;Ramoutar, Jordann C.;O’Connell, Maria A.;Howell, Lesley A.;Searcey, Mark. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2015.Related Products of 313648-56-5 This article mentions the following:

Previous studies on the natural product chlorofusin have shown that the full peptide and azaphilone structure are required for inhibition of the interaction between MDM2 and p53. In the current work, the authors utilized the cyclic peptide as a template and introduced an azidonorvaline amino acid in place of the ornithine/azaphilone of the natural product and carried out click chem. with the resulting peptide. From this small library the first ever non-azaphilone containing chlorofusin analog with MDM2/p53 activity was identified. Further studies then suggested that the simple structure of the Fmoc-norvaline amino acid that had undergone a click reaction was also able to inhibit MDM2/p53 interaction. This is an example where studies of a natural product have led to the serendipitous identification of a new small mol. inhibitor of a protein-protein interaction. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Related Products of 313648-56-5).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) 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. 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.Related Products of 313648-56-5

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

Detours en route to a total synthesis of (+)-cassiol was written by Colombo, Maria I.;Zinczuk, Juan;Bohn, Maria L.;Ruveda, Edmundo A.. And the article was included in Tetrahedron: Asymmetry in 2003.Category: esters-buliding-blocks This article mentions the following:

A synthesis of the antiulcerogenic compound (+)-cassiol was achieved in 43% yield starting with lactol (S)-I and sulfone II. This short and efficient synthesis features the one-pot Julia olefination reaction of the sodium anion of (S)-I with II, through the key intermediate (-)-III. This synthesis has been developed as a result of exploratory experiments including different olefination reactions on I. An attempt to synthesize the intermediate III by an intramol. aldol condensation approach of the open chain precursor is also described. In the experiment, the researchers used many compounds, for example, Ethyl 2,2-dimethyl-1,3-dioxane-5-carboxylate (cas: 82962-54-7Category: esters-buliding-blocks).

Ethyl 2,2-dimethyl-1,3-dioxane-5-carboxylate (cas: 82962-54-7) 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 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. Category: esters-buliding-blocks

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

Influence of harvest season on volatile aroma constituents of two banana cultivars by electronic nose and HS-SPME coupled with GC-MS was written by Dou, Tong-Xin;Shi, Jing-Fang;Li, Yuan;Bi, Fang-Cheng;Gao, Hui-Jun;Hu, Chun-Hua;Li, Chun-Yu;Yang, Qiao-Song;Deng, Gui-Ming;Sheng, Ou;He, Wei-Di;Yi, Gan-Jun;Dong, Tao. And the article was included in Scientia Horticulturae (Amsterdam, Netherlands) in 2020.Synthetic Route of C10H20O2 This article mentions the following:

The odors of banana during harvest change significantly depending upon the season; however, the nature of the changes occurring at different times of harvest is still unclear. To clarify how banana harvesting time affects the volatile compound profiles and comprehensive flavor characterization, the volatile compounds of the BaXi and GuangFen Number 1 banana cultivars during the fruit harvests in March and Sept. were evaluated using electronic nose technol., and also headspace solid phase micro-extraction combined with gas chromatog.-mass spectrometry resp. Results from the principal component anal. and radar fingerprint chart of electronic nose showed that the flavor and volatile components in BaXi and GuangFen Number 1 banana fruit during the harvest in March differed significantly from those harvested in Sept. The relative content of esters in BaXi (95.29%) and GuangFen Number 1 (90.96%) banana fruit harvest in March was significantly higher than for BaXi (59.11%) and GuangFen Number 1 (61.62%) bananas harvested in Sept. We found that only banana fruits harvested in March contained iso-Bu isobutyrate, iso-Bu butyrate, and iso-Bu hexanoate, while hexyl acetate was found only in fruits harvested in Sept. Results indicate that fruits harvested in March have more volatile aroma compounds in both the cultivars. Findings from the current study are useful for the banana industry as it provides baseline data in the difference in physiochem. properties of bananas harvested in different seasons. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Synthetic Route of C10H20O2).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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. 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.Synthetic Route of C10H20O2

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

Evaluation of PTR-ToF-MS as a tool to track the behavior of hop-derived compounds during the fermentation of beer was written by Richter, T. M.;Silcock, P.;Algarra, A.;Eyres, G. T.;Capozzi, V.;Bremer, P. J.;Biasioli, F.. And the article was included in Food Research International in 2018.Related Products of 659-70-1 This article mentions the following:

Hop-derived volatile organic compounds (VOCs) play an important role in the flavor and aroma of beer, despite making up a small percentage of the overall profile. To understand the changes happening during fermentation, proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) was applied for the first time in brewing science to directly measure the changes in hop-derived VOCs during the fermentation of four different worts containing one of two aroma hops in combination with one of two yeast biotypes. PTR-ToF-MS successfully detected and tracked mass-to-charge ratios (m/z) arising from interactions between the different yeast strains and the hop cultivars. Differences were observed in the dynamic VOC profiles between different beer treatments for m/z such as m/z 145.121 (Et hexanoate) and m/z 173.153 (isoamyl isovalerate or Et octanoate). The ability to monitor changes in VOCs during fermentation provides valuable information on the priority of production and transformation reactions by yeast. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Related Products of 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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. 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.Related Products of 659-70-1

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

Comparison of chemical and enzymic synthesis of 2-acetamido-2-deoxy-d-mannose 6-phosphate: a new approach was written by Liu, M.-Z.;Lee, Y. C.. And the article was included in Carbohydrate Research in 2001.Name: (2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate This article mentions the following:

Chem. and enzymic methods to synthesis of 2-acetamido-2-deoxy-D-mannose-6-phosphate (ManNAc-6-P) have been investigated. A new preparative method has been developed although some established procedures were tried. In this new method, a 6-O-acetyl or 4,6-di-O-acetyl group of the per-O-acetylated 2-acetamido-2-deoxy-D-mannose (ManNAc) were regioselectively removed with an esterase from the yellow yeast, Rhodosporidium toruloides, followed by phosphorylation and O-deacetylation under mild conditions. ¹H and ¹³C NMR data spectra of ManNAc-6-P were recorded. In the experiment, the researchers used many compounds, for example, (2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate (cas: 6730-10-5Name: (2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate).

(2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate (cas: 6730-10-5) 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. 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.Name: (2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate

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

Copper on charcoal: Cu⁰ nanoparticle catalysed aerobic oxidation of α-diazo esters was written by Zhao, Rong;Teng, Jiangge;Wang, Zhiwei;Dong, Wenwen;Lin, Jia;Chu, Changhu. And the article was included in Organic & Biomolecular Chemistry in 2021.Application of 587-88-2 This article mentions the following:

By using a charcoal supported nano Cu0 catalyst (Cu/C), a highly efficient oxidation of α-diazo esters to α-ketoesters RCOCOOR¹ [R = Ph, 2-MeC₆H₄, 3-ClC₆H₄, etc.; R¹ = Me, i-Pr, Bn, etc.] with mol. oxygen as the sole oxidant was developed. Furthermore, this Cu/C catalyst could catalyzed the reaction of aryl α-diazo ester with water to form aryl ketoester, 2-aryl-2-hydroxyl acetate ester and 2-aryl acetate ester. In this case, water was split by α-diazo ester, and the diazo group was displaced by the oxygen or hydrogen atom in water. Mechanistic investigation showed that the reaction of α-diazo ester with oxygen proceeds through a radical pathway. In the presence of 2,2,6,6-tetra-Me piperidine nitrogen oxide, the reaction of α-diazo ester with oxygen was dramatically inhibited. Furthermore, the reaction of α-diazo ester with water was investigated by an isotopic tracer method, and GCMS detection showed that a disproportionation reaction occurred between α-diazo ester and water. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Application of 587-88-2).

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

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