Tag: 200-300

Phatake, Ravindra S.;Nechmad, Noy B.;Reany, Ofer;Lemcoff, N. Gabriel published 《Highly Substrate-Selective Macrocyclic Ring Closing Metathesis》. The research results were published in《Advanced Synthesis & Catalysis》 in 2022.Product Details of 106-02-5 The article conveys some information:

A selective ring-closing metathesis (RCM) reaction for the formation of large macrocycles, e.g., I by using latent sulfur chelated ruthenium iodide benzylidenes, readily activated by thermal and photochem. (UV-A and visible light) stimuli, is reported. For dienes, e.g., (E)-Henicosa-1,19-dien-10-one having one terminal alkene and one internal double bond, the specific affinity of diiodo ruthenium alkylidenes for the unhindered terminus, combined with their reluctance to react with internal olefins, favors RCM over oligomerization, providing high macrocyclic yields even at relatively high concentrations Alternatively, for substrates containing two internal double bonds, a sacrificial methylene donor can be used to obtain the desired products. With this methodol., lactones, lactams, and macrocyclic ketones ranging from 13- to 22-membered rings could be synthesized in moderate to high yields. In addition, synthetic applications for a one-pot cyclization/reduction sequence to produce Exaltolide, a natural macrolide (com. musk), Dihydrocivetone, and other saturated macrocycles have been explored. An important advantage for diiodo ruthenium benzylidene catalysts over their less selective dichloro counterparts provides a more profound understanding of the mechanisms that provide the enhanced cyclization outcome. And Oxacyclohexadecan-2-one (cas: 106-02-5) was used in the research process.

Oxacyclohexadecan-2-one(cas:106-02-5) is a natural product found in Lonicera japonica and Angelica archangelica.Product Details of 106-02-5 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

Product Details of 124-06-1In 2022, Ali, Barkat;Khan, Kiran Yasmin;Majeed, Hamid;Jin, Yamei;Xu, Dan;Rao, Zhiming;Xu, Xueming published 《Impact of Soy-Cow’s mixed milk enzyme modified cheese on bread aroma》. 《LWT–Food Science and Technology》published the findings. The article contains the following contents:

The effect of spray-dried Soy-Cow’s mixed milk enzyme modified (SC-EM) cheese on wheat dough properties and bread aroma was evaluated at either 0.1, 0.5, 1.0, 1.5 or 2.0% (weight/weight). Significant accumulation of amino acids and peptides of dough were noted as SC-EM cheese levels increased. After baking a total of 118 volatile compounds (VCs) were identified in breads having aldehydes, alcs., esters and acids in major proportions. Higher contents of Maillard product 3-hydroxy-2-butanone, 2-methyl-1-propanol, phenylethyl alc., undecane, L-limonene, 2-pentyl furan and lipid oxidation compounds hexanoic acid Et ester, octanoic acid Et ester, decanoic acid Et ester, butanoic acid, hexanoic acid and octanoic acid were observed Isoamyl alc., lactic acid Et ester, Et sorbate and sorbic acid were the newly identified VCs. These results revealed that SC-EM cheese could be used as improver in dough and contribution to bread aroma. Thus, SC-EM cheese has been proposed to be included in fortified bakery products.Ethyl tetradecanoate (cas: 124-06-1) were involved in the experimental procedure.

Ethyl tetradecanoate(cas: 124-06-1) is a natural product found in Psidium guajava, Litchi chinensis, and other organisms.Product Details of 124-06-1Ethyl myristate is a long-chain fatty acid ethyl ester resulting from the formal condensation of the carboxy group of myristic acid with the hydroxy group of ethanol.

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

Gimenez-Banon, Maria Jose;Moreno-Olivares, Juan Daniel;Paladines-Quezada, Diego Fernando;Bleda-Sanchez, Juan Antonio;Fernandez-Fernandez, Jose Ignacio;Parra-Torrejon, Belen;Delgado-Lopez, Jose Manuel;Gil-Munoz, Rocio published 《Effects of Methyl Jasmonate and Nano-Methyl Jasmonate Treatments on Monastrell Wine Volatile Composition》. The research results were published in《Molecules》 in 2022.Reference of Ethyl tetradecanoate The article conveys some information:

The application of Me jasmonate (MeJ) as an elicitor to enhance secondary metabolites in grapes and wines has been studied, but there is little information about its use in conjunction with nanotechnol. and no information about its effects on wine volatile compounds This led us to study the impact of nanoparticles doped with MeJ (Nano-MeJ, 1mM MeJ) on the volatile composition of Monastrell wines over three seasons, compared with the application of MeJ in a conventional way (10 mM MeJ). The results showed how both treatments enhanced fruity esters in wines regardless of the vintage year, although the increase was more evident when grapes were less ripe. These treatments also achieved these results in 2019 in the cases of 1-propanol, beta-phenyl-ethanol, and methionol, in 2020 in the cases of hexanol and methionol, and in 2021, but only in the case of hexanol. On the other hand, MeJ treatment also increased the terpene fraction, whereas Nano-MeJ, at the applied concentration, did not increase it in any of the seasons. In summary, although not all families of volatile compounds were increased by Nano-MeJ, the Nano-MeJ treatment generally increased the volatile composition to an extent similar to that obtained with MeJ used in a conventional way, but at a 10 times lower dose. Therefore, the use of nanotechnol. could be a good option for improving the quality of wines from an aromatic point of view, while reducing the necessary dosage of agrochems., in line with more sustainable agricultural practices. To complete the study, the researchers used Ethyl tetradecanoate (cas: 124-06-1) .

Ethyl tetradecanoate(cas: 124-06-1) is a labeled component from essential oil of natural hawthorn perfume. Also frequently used in cosmetics, soaps, and flavorings.Reference of Ethyl tetradecanoateEthyl myristate is a long-chain fatty acid ethyl ester resulting from the formal condensation of the carboxy group of myristic acid with the hydroxy group of ethanol.

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

Reference of Methyl oleate《Phosphotungstic acid and propylsulfonic acid bifunctionalized ordered mesoporous silica: A highly efficient and reusable catalysts for esterification of oleic acid》 was published in 2022. The authors were Yu, Zhengfei;Chen, Xifeng;Zhang, Yibo;Tu, Hongyu;Pan, Pen;Li, Shuai;Han, Yuxiang;Piao, Minjun;Hu, Jianglei;Shi, Fengwei;Yang, Xia, and the article was included in《Chemical Engineering Journal (Amsterdam, Netherlands)》. The author mentioned the following in the article:

In phosphotungstic acid aqueous solution, the ordered mesoporous silica mol. sieve (HPW/OMS-SO₃H) simultaneously functionalized by phosphotungstic acid (HPW) and Pr sulfonic acid groups (-pr-SO₃H) was successfully prepared via a one-pot co-condensation method. The skeleton of the materials was formed based on the simultaneous hydrolysis and co-condensation of 3-mercaptopropyltriethoxysilane (MPTES) and tetraethoxysilane (TEOS) using in situ oxidation of the thiol groups to sulfoacid groups with H₂O₂. The materials with an ordered 2D hexagonal mesoporous structure and a high sp. surface area were confirmed by the results of small-angle XRD, N₂ adsorption-desorption, and TEM. The spectroscopy of FT-IR, UV-Vis DRS, XPS, and Raman indicated that the active component of HPW and propylsulfonic acid groups successfully immobilized on the OMS support and a strong interaction existed among silicon hydroxyl and propylsulfonic acid groups with HPW. The esterification reaction of oleic acid with methanol to produce biodiesel over prepared catalyst showed excellent catalytic activity due to the synergistic effect between the HPW and propylsulfonic acid groups. The biodiesel yield of 95.3% was obtained by 0.3HPW/OMS-SO₃H-5 catalyst under the optimum reaction conditions. The catalytic performance was not reduced significantly even after five cycles reused, because the strong interaction prevented acid-active component loss from the support. The activation energy of the reaction by the 0.3HPW/OMS-SO₃H-5 materials was investigated, which obeyed the first-order kinetics.Methyl 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.Reference of Methyl oleate It is also used in biochemical research as a chromatographic reference standard.

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

COA of Formula: C10H16O4In 1985, Perkins, M. John;Adae-Amoakoh, Sylvia;Mitchell, John C.;Smith, Brian V. published 《Intramolecular cyclizations of primary alkyl esters of 3-bromopropylmalonic acid: an unexpected correlation between activation parameters and alkyl chain lengths》. 《Journal of Chemical Research, Synopses》published the findings. The article contains the following contents:

The cyclization rate of Br(CH₂)₃CH(CO₂R)₂ [R = Me, Et, Bu, (CH₂)₅Me] increased regularly with the chain length of R. Plots of the entropy and enthalpy of activation of the reaction vs. the chain length unexpectedly gave linear graphs of high correlation coefficient (0.98 and 0.99, resp.).Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) were involved in the experimental procedure.

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

Product Details of 3779-29-1In 2008, Cardoso, Renata da Silva;Galvao da Silva, Micheli;Marques, Maria de Fatima Vieira published 《Evaluation of internal and external donors in the supported Ziegler-Natta catalyst for stereospecific propylene polymerization》. 《Annual Technical Conference – Society of Plastics Engineers》published the findings. The article contains the following contents:

In the present work, the effects of Bu phthalate as internal electron donor on the preparation of MgCl₂-supported Ziegler-Natta catalyst and of dimethoxy-diphenylsilane as external electron donor were evaluated in propylene polymerization and compared with the new prepared Ziegler-Natta systems employing diverse internal and external electron donors. Polymers were characterized by IR absorption spectroscopy, differential scanning calorimetry and by heptane extraction The new prepared catalysts did not achieve the same polymer yields compared with the reference catalyst. On the other hand, the catalysts with the new internal donors produced polymers with isotacticity index up to 98% in the polymerization conditions employed. 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 Product Details of 3779-29-1) 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

COA of Formula: C16H32O2《Enhancing Ethanol Tolerance via the Mutational Breeding of Pichia terricola H5 to Improve the Flavor Profiles of Wine》 was published in 2022. The authors were Gao, Jie;He, Xiuli;Huang, Weidong;You, Yilin;Zhan, Jicheng, and the article was included in《Fermentation》. The author mentioned the following in the article:

Although using non-Saccharomyces yeasts during alc. fermentation can improve the wine aroma, most of them are not ethanol tolerant; therefore, in 2017, this study screened 85 non-Saccharomyces yeasts isolated and identified from 24 vineyards in seven Chinese wine-producing regions, obtaining Pichia terricola strain H5, which displayed 8% ethanol tolerance. Strain H5 was subjected to UV irradiation and di-Et sulfate (DES) mutagenesis treatment to obtain mutant strains with different fermentation characteristics from the parental H5. Compared with strain H5, the UV-irradiated strains, UV5 and UV8, showed significantly higher ethanol tolerance and fermentation capacity. Modified aroma profiles were also evident in the fermentation samples exposed to the mutants. Increased Et caprate, Et caprylate, and Et dodecanoate content were apparent in the UV5 samples, providing the wine with a distinctly floral, fruity, and spicy profile. Fermentation with strain UV8 produced a high Et acetate concentration, causing the wine to present a highly unpleasant odor. To a certain extent, UV irradiation improved the ethanol tolerance and fermentation ability of strain H5, changing the wine aroma profile. This study provides a theor. basis for the industrial application of non-Saccharomyces yeasts that can improve wine flavor. To complete the study, the researchers used Ethyl tetradecanoate (cas: 124-06-1) .

Ethyl tetradecanoate(cas: 124-06-1) is a labeled component from essential oil of natural hawthorn perfume. Also frequently used in cosmetics, soaps, and flavorings.COA of Formula: C16H32O2Ethyl myristate is a long-chain fatty acid ethyl ester resulting from the formal condensation of the carboxy group of myristic acid with the hydroxy group of ethanol.

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

Ojima, Fumihiro;Osa, Tetsuo published 《Perkin-Markovnikov type reaction initiated with electrogenerated superoxide ion》 in 1989. The article was appeared in 《Bulletin of the Chemical Society of Japan》. They have made some progress in their research.Category: esters-buliding-blocks The article mentions the following:

The cyclic condensation of active methylene compounds such as di-Et malonate, di-Me malonate, Et acetoacetate or acetylacetone and dibromoalkanes such as 1,2-dibromobutane, or 1,4-dibromopentane with electrogenerated superoxide ion was studied electrochem. in DMF using cyclic voltammetry (CV) and controlled potential macroelectrolysis. The CV shows that electrogenerated superoxide ion reacts with both active methylene compounds and dibromoalkanes in the dissolved oxygen medium. Controlled potential macroelectrolysis of the above components generally yielded cycloalkanes as the main products. In comparison, the chem. method using sodium ethoxide was also carried out. Two reaction mechanisms via the proton abstraction of active methylene compds, with electrogenerated superoxide ion and via the nucleophilic attack of the superoxide ion on dibromoalkanes are presented. To complete the study, the researchers used Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) .

Diethyl 1,1-cyclobutanedicarboxylate(cas:3779-29-1 Category: esters-buliding-blocks) 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

Formula: C15H28O2In 2020, Tahiri, Nabil;Fodran, Peter;Jayaraman, Dhineshkumar;Buter, Jeffrey;Witte, Martin D.;Ocampo, Tonatiuh A.;Moody, D. Branch;Van Rhijn, Ildiko;Minnaard, Adriaan J. published 《Total Synthesis of a Mycolic Acid from Mycobacterium tuberculosis》. 《Angewandte Chemie, International Edition》published the findings. The article contains the following contents:

In Mycobacterium tuberculosis, mycolic acids and their glycerol, glucose, and trehalose esters (“cord factor”) form the main part of the mycomembrane. Despite their first isolation almost a century ago, full stereochem. evaluation is lacking, as is a scalable synthesis required for accurate immunol., including vaccination, studies. Herein, we report an efficient, convergent, gram-scale synthesis of four stereo-isomers of a mycolic acid and its glucose ester. Binding to the antigen presenting protein CD1b and T cell activation studies are used to confirm the antigenicity of the synthetic material. The absolute stereochem. of the syn-methoxy Me moiety in natural material is evaluated by comparing its optical rotation with that of synthetic material. To complete the study, the researchers used Oxacyclohexadecan-2-one (cas: 106-02-5) .

Oxacyclohexadecan-2-one(cas:106-02-5) is a natural product found in Lonicera japonica and Angelica archangelica.Formula: C15H28O2 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