Category: esters-buliding-blocks

Cahyo Kumoro, Andri;Saeed, Mahmood Taha M. N. published 《Ultrasound-assisted transesterification of tropical goat fat – Palm oil blend for biodiesel synthesis》 in 2022. The article was appeared in 《Energy Conversion and Management: X》. They have made some progress in their research.Quality Control of Methyl oleate The article mentions the following:

The increasing trend of global energy demand has encouraged the development of renewable energies, especially those derived from biomass and agricultural residues. This work aimed to study the effect of catalyst loading, temperature, and methanol-to-oil molar ratio on the yield and the reaction kinetics of ultrasound-assisted transesterification of tropical goat fats for biodiesel synthesis. Prior to trans-esterification, the oil extracted from the tropical goat fat was mixed with an equal volume of tropical palm oil to prevent its solidification tendency. To reduce the free fatty acids content of the mixed oil, it was esterified using a methanol-to-oil molar ratio of 9 employing 1 wt% sulfuric acid as the catalyst at 65 °C and 400 rpm agitation speed for 60 min. Then, the esterified oil was further subjected to an ultrasound-assisted transesterification system with sodium hydroxide catalyst for the reaction kinetics and biodiesel synthesis studies. The biodiesel properties were evaluated by both laboratory tests and BiodieselAnalyzer software, which employs the fatty acid Me ester composition obtained from GC-MS anal. The highest conversion (78.50%) was achieved at 65 °C, 2.5 wt% of NaOH, and 8:1 methanol/oil blend molar ratio for 60 min. The pseudo-first order reaction fitted all the exptl. data very well by giving the R2 values higher than 0.98 and an apparent reaction rate constant of 2.15×10-2 min-1 at the optimum condition. Furthermore, all the examined biodiesel physicochem. properties fulfilled the ASTM D6751 standard suggesting the promising potential of goat fats as the raw material for biodiesel manufactureMethyl oleate (cas: 112-62-9) were involved in the experimental procedure.

Methyl oleate(cas: 112-62-9) is a fatty acid methyl ester resulting from the formal condensation of the carboxy group of oleic acid with methanol.Quality Control of Methyl oleate It is also used in biochemical research as a chromatographic reference standard.

Reference:
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Yu, Zhiqun;Yao, Hongmiao;Xu, Qilin;Liu, Jiming;Le, Xingmao;Ren, Minna published 《Bronsted acid-catalyzed chlorination of aromatic carboxylic acids》. The research results were published in《Phosphorus, Sulfur and Silicon and the Related Elements》 in 2021.Category: esters-buliding-blocks The article conveys some information:

The chlorination of aromatic carboxylic acids with SOCl₂ has been effectively performed by reacting with a Bronsted acid as the catalyst. Based on this discovery, an efficient catalytic method that is cheaper than traditional catalytic methods was developed. 20 substrates were chlorinated offering excellent yields in a short reaction time. And the SOCl₂/Bronsted acid system has been used in a larger scale preparative reaction. A dual activation mechanism was proposed to prove the irreplaceable system of SOCl₂/Bronsted acid.Methyl 3-methylbenzoate (cas: 99-36-5) were involved in the experimental procedure.

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester.Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids.Category: esters-buliding-blocks Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries.

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

Lee, Isabelle;Na, Mihwa;O’Brien, Devin;Parakhia, Rahul;Alepee, Nathalie;Westerink, Walter;Eurlings, Irene;Api, Anne Marie published 《Assessment of the skin sensitization potential of fragrance ingredients using the U-SENS assay》 in 2022. The article was appeared in 《Toxicology In Vitro》. They have made some progress in their research.Quality Control of Methyl 2,4-dihydroxy-3,6-dimethylbenzoate The article mentions the following:

The U-SENS assay was developed to address the third key event of the skin sensitization adverse outcome pathway (AOP) and is described in OECD test guideline 442E, Annex II. A dataset of 68 fragrance ingredients comprised of 7 non-sensitizers and 61 sensitizers was tested in the U-SENS assay. The potential for fragrance ingredients to activate dendritic cells, measured by U-SENS, was compared to the sensitization potential determined by weight of evidence (WoE) from historical data. Of the non-sensitizers, 4 induced CD86 cell surface marker ≥1.5-fold while 3 did not. Of the sensitizers, 50 were predicted to be pos. in U-SENS, while the remaining 11 were neg. Pos. and neg. predictive values (PPV and NPV) of U-SENS were 93% and 21%, resp. No specific chem. property evaluated could account for misclassified ingredients. Assessment of parent and metabolite protein binding alerts in silico suggests that parent chem. metabolism may play a role in CD86 activation in U-SENS. Combining the U-SENS assay in a “2 out of 3” defined approach with the direct peptide reactivity assay (DPRA) and KeratinoSens predicted sensitization hazard with PPV and NPV of 97% and 24%, resp. Combining complementary in silico and in vitro methods to the U-SENS assay should be integrated to define the hazard classification of fragrance ingredients, since a single NAM cannot replace animal-based methods. The experimental procedure involved many compounds, such as Methyl 2,4-dihydroxy-3,6-dimethylbenzoate (cas: 4707-47-5) .

Methyl 2,4-dihydroxy-3,6-dimethylbenzoate(4707-47-5) is used in biological study as role of androgens in inducing distinct response of epithelial-mesenchymal transition factors in human prostate cancer cells.Quality Control of Methyl 2,4-dihydroxy-3,6-dimethylbenzoate

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Molchanov, A. P.;Kostikov, R. R. published 《Synthesis of dispiro[2.1.3.1]nonane and trispiro[2.1.1.3⁷.1⁵.1³]-dodecane》 in 2012. The article was appeared in 《Russian Journal of Organic Chemistry》. They have made some progress in their research.Reference of Diethyl cyclobutane-1,1-dicarboxylate The article mentions the following:

The synthesis of dispiro[2.1.3.1]nonane and trispiro[2.1.1.3⁷.1⁵.1³]-dodecane from di-Et cyclobutane-1,1-dicarboxylate is presented. Unique to the spirocyclic hydrocarbons of three, and/or four membered rings are high strain energy and enhanced reactivity which have versatile benefits in organic synthesis. To complete the study, the researchers used Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) .

Diethyl cyclobutane-1,1-dicarboxylate (cas:3779-29-1
) is a solid catalyst that can be used in the synthesis of alkylating agents. It is used in the manufacture of cyclopropyl ketones and has been shown to exhibit anticancer properties.

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

SDS of cas: 112-62-9In 2022, Welter, Rosilene A.;Santana, Harrson;de la Torre, Lucimara G.;Robertson, Mark;Taranto, Osvaldir Pereira;Oelgemoller, Michael published 《Methyl Oleate Synthesis by TiO₂ Photocatalytic Esterification of Oleic Acid: Optimization by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics》. 《ChemPhotoChem》published the findings. The article contains the following contents:

Me oleate, an example of a FAME (fatty acid Me ester), was produced by oleic acid (OA) photoesterification with TiO₂ and UVA light. Different parameters were evaluated and optimized: catalyst pretreatment, temperature (25-65°C), catalyst loading (1-30% weight/weightOA) and oleic acid : alc. molar ratio (1 : 3-1 : 55). Response surface quadratic methodol. obtained by central composite rotational design (RSM-CCRD) was used to evaluate the main operational conditions of the photoesterification process. A high conversion of 98% (±0.8) at 55°C, 20% TiO₂ (weight/weightOA), and 1(OA) : 55(methanol) molar ratio was achieved. The photoesterification mechanism is furthermore proposed. The Langmuir-Hinshelwood kinetic model considered the forward and backward reaction as first-order fits with the best accuracy (R² of 0.997). The thermodn. results (ΔG_338.15K = -20.75 kJ/mol, ΔH = 13.75 kJ/mol, and ΔS = 0.47 kJ/mol.K) indicate that the operating conditions are important, both to supply the energy requirement of the reaction, but also to increase the miscibility of the reactants.Methyl oleate (cas: 112-62-9) were involved in the experimental procedure.

Methyl oleate(cas: 112-62-9) is an intermediate for detergents, emulsifiers, wetting agents, stabilizers, textile treatments, plasticizers for duplicating inks, rubbers, waxes etc.SDS of cas: 112-62-9 It is also used in biochemical research as a chromatographic reference standard.

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

Application In Synthesis of Diethyl cyclobutane-1,1-dicarboxylate《A novel ring expansion of 1-carbethoxy-1,1-trimethylene-3-diazo-2-propanone》 was published in 1986. The authors were Miller, R. D.;Theis, W., and the article was included in《Tetrahedron Letters》. The author mentioned the following in the article:

Gas phase pyrolysis of title compound I gave butenolide II via ring enlargement initiated by the intramol. reaction of the intermediate ketene III with the pendant ester group. The experimental procedure involved many compounds, such as Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) .

Diethyl 1,1-cyclobutanedicarboxylate(cas:3779-29-1 Application In Synthesis of Diethyl cyclobutane-1,1-dicarboxylate) reacts with silicon to form diethyl esters and magnesium to form magnesium salts. The reaction time for this compound is short, which may be due to its ability to undergo debromination.

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

Reference of Oxacyclohexadecan-2-oneIn 2020, Polloni, Andre E.;Chiaradia, Viviane;do Amaral, Ronaldo Jose F. C.;Kearney, Cathal;Gorey, Brian;de Oliveira, Debora;de Oliveira, Jose V.;de Araujo, Pedro H. H.;Sayer, Claudia;Heise, Andreas published 《Polyesters with main and side chain phosphoesters as structural motives for biocompatible electrospun fibres》. 《Polymer Chemistry》published the findings. The article contains the following contents:

Phosphoester containing polymers are promising materials in biomedical applications due to their biocompatibility and biodegradability. Utilizing thiol-ene chem., the synthesis of two novel structural polymer motives combining polyesters and phophoester groups was explored. The first polymer was obtained by coupling ene-functional poly(thioether-phosphoester) with thiol functional poly(pentadecalactone). While the coupling reaction was successful, yields remained low presumably due to inadequate endgroup stoichiometry. The second polymer comprised phosphoester side groups conjugated to unsaturated poly(globalide). Double bond conversions up to 84% were achieved depending of the type of phosphoester thiol and relative reactant ratios. The resulting polymers transitioned from solid semicrystaline to liquid amorphous with increasing degree of phosphoester conjugation. Electrospun fibers from polymers with 14% phosphoester conjugation allowed attachment and survival of human dermal fibroblasts, indicating their biocompatibility. These polymers represent a new class of easily accessible biocompatible polyester-phosphoester hybrid materials as potential building blocks for tunable biomaterials.Oxacyclohexadecan-2-one (cas: 106-02-5) were involved in the experimental procedure.

Oxacyclohexadecan-2-one(cas:106-02-5) is a natural product found in Lonicera japonica and Angelica archangelica.Reference of Oxacyclohexadecan-2-one It is a macrocyclic lactone that can be used as a flavoring agent and fragrance ingredient due to its musk flavor/odor.

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

Naddeo, Marco;Vigliotta, Giovanni;Pellecchia, Claudio;Pappalardo, Daniela published 《Synthesis of bio-based polymacrolactones with pendant eugenol moieties as novel antimicrobial thermoplastic materials》 in 2020. The article was appeared in 《Reactive & Functional Polymers》. They have made some progress in their research.Related Products of 106-02-5 The article mentions the following:

In the last few decades there has been a continuous effort toward the synthesis of polymers from renewable resources. In this context we have presently developed novel and fully bio-based functionalized polymacrolactones bearing pendant eugenol moieties. These polymeric materials were obtained by exploiting the ring-opening copolymerization of two macrolactones, ω-6-hexadecenlactone (6HDL) and ω-pentadecalactone (PDL), both derived from renewable resources, in the presence of a pyridylamidozinc(II) complex, to produce random poly(6HDL-co-PDL) copolymers. Eugenol, a natural occurring essential oil with anti-microbial properties, was modified in its mercapto derivative, the 4-(3-mercaptopropyl)-2-methoxyphenol (TE). Subsequently, the thiol-ene addition reaction of the TE to the C-C double bond of the 6HDL monomeric units of the poly(6HDL-co-PDL) copolymers produced the functionalized polymacrolactones with pendant eugenol moieties. The melting temperatures and the thermal degradation behavior of the TE-functionalized copolymers were dependent on the copolymers composition The antimicrobial activity of TE-functionalized copolymers was tested for the bacterium E. coli on films. The toxicity of the samples was dependent on the amount of TE groups in the films. Our approach demonstrated the feasibility to covalently attach eugenol moieties to a polymacrolactone main chain and to impart antimicrobial properties to the macromol. chains.Oxacyclohexadecan-2-one (cas: 106-02-5) were involved in the experimental procedure.

Oxacyclohexadecan-2-one(cas:106-02-5) is a monomer used to make PGA-co-pentadecalactone polymers to be used in the development of directly compressed prolonged release tablets of slightly soluble drugs such as ketoprofen.Related Products of 106-02-5It may be used for the synthesis of poly(pentadecanolide) (PPDL) by Novozyme 435 catalyzed ring-opening polymerization.

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

Category: esters-buliding-blocksIn 2021, Li, Fu-xiao;Li, Dong-long;Wang, Hui-yi;Li, Qiu-feng;Liu, Ji-dong published 《Analysis of volatile flavor compounds of γ-aminobutyric acid soybean paste》. 《Xiandai Shipin Keji》published the findings. The article contains the following contents:

To evaluate the flavor difference between com. soybean paste and γ-aminobutyric acid (GABA) bean paste, headspace solid-phase microextraction (HS-SPME) and gas chromatog.-mass spectrometry (GC-MS) were used to measure and analyze the volatile components and the common indexes in nine com. soybean paste samples (S1-S9) and the GABA soybean paste sample (S10) . The key volatile components were determined by principal component anal. (PCA) and odor activity value (OAV) . The results showed that 144 compounds in eight categories were detected in 10 soybean paste samples and the content of γ-aminobutyric acid in S10 reached 1.87 mg/g, the pH value was 4.69, and the color was bright without impurities. Among them, esters, alcs. and acids accounted for more than 60% of the total volatile components. Addnl., the results of PCA of 41 common volatile substances were identified in 10 soybean paste samples, demonstrating that 2-methyl-butyraldehyde, 3-methyl-butyraldehyde, dimethyl-trisulfide and guaiacol significantly contributed to the flavor formation of bean paste. Besides, the GABA soybean paste has a rich variety of flavors, in which the contents of 2-pentylfuran, 2-ethyl-6-methylpyrazine, guaiacol and di-Me trisulfide (which exhibited aromas of mung bean, nut and clove) were significantly higher than other samples. This could be the reason for some differences in flavor substances between GABA soybean paste and other samples. The results of this study could provide theor. reference for the development of functional soybean paste and the flavor improvement in soybean paste products. The experimental procedure involved many compounds, such as 1-Phenylethyl acetate (cas: 93-92-5) .

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. Category: esters-buliding-blocks It may be prepared by acetylation of methyl phenyl carbinol; from 1-bromoethylbenzene and silver acetate in acetic acid; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation.

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

Cetti, Jonathan;Eike, David;Ferrero Vallana, Federico M.;Gunaratne, H. Q. Nimal;Holland, Lynette A. M.;Puga, Alberto V.;Seddon, Kenneth R.;Todini, Oreste published 《Modeling the Vapor-Liquid Equilibria of Ionic Liquids Containing Perfume Raw Materials》 in 2017. The article was appeared in 《Journal of Chemical & Engineering Data》. They have made some progress in their research.Category: esters-buliding-blocks The article mentions the following:

In this work, the vapor-liquid equilibrium of binary and multinary systems comprise perfume raw materials and ionic liquids have been computed using two different models: COSMO-RS, a solvation model, and UNIFAC, a group contribution method. For systems already well-known in the literature, a comparison with exptl. data was performed, and good agreement was observed with both models. Although UNIFAC was not applicable to nonparametrized ionic liquids, COSMO-RS proved very reliable in predicting the vapor-liquid equilibrium of solutions of perfume raw materials in new-to-the-world ionic liquids This opens the door for the prediction and modeling of new formulations for novel consumer products, prior to embarking on detailed exptl. investigations. And Methyl 2,4-dihydroxy-3,6-dimethylbenzoate (cas: 4707-47-5) was used in the research process.

Methyl 2,4-dihydroxy-3,6-dimethylbenzoate(4707-47-5) is used in biological study as role of androgens in inducing distinct response of epithelial-mesenchymal transition factors in human prostate cancer cells.Category: esters-buliding-blocks

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