Category: esters-buliding-blocks

Enantioselectivity switch in asymmetric Michael addition reactions using phosphonium salts was written by Fang, Guosheng;Wang, Hongyu;Zheng, Changwu;Pan, Lu;Zhao, Gang. And the article was included in Organic & Biomolecular Chemistry in 2021.Name: malonic acid dibutyl ester This article mentions the following:

Here,a general method to obtain both enantiomeric products via fine tuning the hydrogen-bonding interactions of phosphonium salts was reported. Amino acid derived phosphonium salts and dipeptide derived phosphonium salts exhibited different properties for controlling the transition state, which could efficiently promote the Michael addition reaction to give opposite configurations of products with high yields and enantioselectivities. Preliminary investigations on the mechanism of the reaction and applications of the products were also performed. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Name: malonic acid dibutyl ester).

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

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

Oxovanadium(V) and Dioxomolybdenum(VI) Complexes of Amide-Imine Conjugates: Structures, Catalytic and Antitumor Activities was written by Ta, Sabyasachi;Ghosh, Milan;Salam, Noor;Ghosh, Subhasis;Brandao, Paula;Felix, Vitor;Hira, Sumit Kumar;Manna, Partha Pratim;Das, Debasis. And the article was included in ACS Applied Bio Materials in 2019.Computed Properties of C9H10O3 This article mentions the following:

Three new amide-imine conjugates, [(E)-2-hydroxy-N’-((2-hydroxynaphthalen-1-yl)methylene)benzohydrazide] (SALNP), [(E)-N’-(4-(diethylamino)-2-hydroxybenzylidene)-2-hydroxybenzohydrazide](SALSD),and [(E)-N’-(3-ethoxy-4-hydroxybenzylidene)-2-hydroxybenzohydrazide] (SALVN), derived by reacting 2-hydroxybenzohydrazide (SAL) with three different aldehyde, 2-hydroxynaphthaldehyde, 4-(diethylamino)-2-hydroxybenzaldehyde, and 3-ethoxy-4-hydroxybenzaldehyde, resp. Three mononuclear oxovanadium(V) and two μ_oxo-bridged dinuclear molybdenum(VI) complexes were synthesized using SALNP and SALSD. Besides, SALVN was used to prepare oxovanadium(V) and dioxomolybdenum(VI) complexes. All five metal complexes along with three amide-imine conjugates were characterized by single crystal XRD anal. Some of them were explored as catalyst for oxidation of alkyl benzene and styrene. Antitumor activities of the metal complexes along with ligands were studied on Dalton lymphoma (DL) and 2PK3 murine lymphoma cells. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Computed Properties of C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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. 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.Computed Properties of C9H10O3

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

Synthesis of medium-chain carboxylic acids or α,ω-dicarboxylic acids from cellulose-derived platform chemicals was written by Li, Xing-Long;Zhang, Kun;Jiang, Ju-Long;Zhu, Rui;Wu, Wei-Peng;Deng, Jin;Fu, Yao. And the article was included in Green Chemistry in 2018.Application of 106-79-6 This article mentions the following:

Medium-chain fatty acids and their derivatives have important applications in the energy and chem. industries. Thus, a series of medium-chain fatty acids were prepared by the selective hydrodeoxygenation of the aldol condensation products derived from cellulose using a metal triflate and Pd/C catalyst system. The selective retention of the carboxyl group is a notable feature of this catalytic system. 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 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. 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.Application of 106-79-6

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

Comparison of two methods for the collection of volatiles from three legumes was written by Bai, Ze-zhen;Yang, Mei-hong;Zhao, Xiang. And the article was included in Caoyuan Yu Caoping in 2021.Related Products of 695-06-7 This article mentions the following:

Volatiles from three legume species, Medicago ruthenica, black soybean and Glycine soja, were extracted by dynamic headspace extraction and solid-phase microextraction (SPME) to investigate the effects of extraction method on the volatile components. Gas chromatog.-mass spectrometry was used to analyze and identify the main components of volatiles. The results showed that the volatile components (mainly alcs., aldehydes, acids, esters, ketones, terpenes and hydrocarbons) extracted by dynamic headspace extraction were different from those by SPME. There were 33, 18 and 16 components of volatiles extracted by dynamic headspace extraction in M. ruthenica, black soybean and Glycine soja, resp., while the corresponding values extracted by SPME were 24, 24 and 22. Some common chems. were extracted using those two different methods, for example, six chems. (including leaf alc., trans-hex-3-en-1-ol, (E)-β-ocimene, 4-ethylbenzaldehyde, cis-3-hexenyl acetate, hexadecane) in M. ruthenica; three chems. (4-ethylbenzaldehyde, cis-3-hexenyl acetate and cyclohexane) in black soybean; and 4 chems. (4-ethylbenzaldehyde, cis-3-hexenyl acetate, oct-1-en-3-ol and 3-octanol) in Glycine soja. The chems., cis-3-hexenyl acetate and 4-ethylpropiophenone were detected in all those three legume species. The main volatile components extracted by dynamic headspace anal. were esters, while the main components extracted by SPME were alcs. As the dynamic headspace anal. could reflect the near-natural state of plants, it is recommended for the collection of volatiles from plants. This study identified the volatile components of three legume species, which could provide reference for further screening of volatile components in legumes that have attracting activity to insects. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Related Products of 695-06-7).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. 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 695-06-7

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

Crown Ether Cavity-Containing Copolymers via Controlled Alternating Cyclocopolymerization was written by Jia, Yong-guang;Liu, Ling-yan;Lei, Bin;Li, Jing;Zhu, X. X.. And the article was included in Macromolecules (Washington, DC, United States) in 2011.Application In Synthesis of Benzyl benzodithioate This article mentions the following:

The cyclocopolymn. of difunctional styrenic flexible monomers with maleic anhydride via reversible addition-fragmentation chain transfer (RAFT) has been investigated. The reaction proceeded to yield gel-free copolymers soluble in organic solvents. The kinetic study indicated that the cyclocopolymn. of difunctional styrenic flexible monomer with maleic anhydride proceeded in a controlled manner. The structures of resulting crown ether cavity-containing copolymers were characterized by the use of NMR spectroscopy and MALDI-TOF mass spectrometry. The crown ether cavities in copolymers exhibited a selective recognition for certain dialkylammonium ions. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Application In Synthesis of Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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.Application In Synthesis of Benzyl benzodithioate

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

New europium coordination polymers with efficient energy transfer from conjugated tetracarboxylate ligands to Eu³⁺ ion: syntheses, structures, luminescence and magnetic properties was written by Wang, Li-Feng;Kang, Ling-Chen;Zhang, Wen-Wei;Wang, Fang-Ming;Ren, Xiao-Ming;Meng, Qing-Jin. And the article was included in Dalton Transactions in 2011.Formula: C12H10O4 This article mentions the following:

Two novel lanthanide coordination polymers, [Eu₂(EBTC)(DMF)₅(NO₃)₂]·DMF (1) and [Eu₂(BBTC)_1.5(CH₃OH)₂(H₂O)₂]·7DMF·HNO₃ (2) (EBTC^4- = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; BBTC^4- = 1,1′-butadiynebenzene-3,3′,5,5′-tetracarboxylate), were successfully synthesized from conjugated ligands of EBTC^4- and BBTC^4-. Although the two tetracarboxylate ligands have similar structures, their different rigidity/flexibility results in quite different networks upon complexation. Complex 1 has a two-dimensional (2-D) layered structure with two crystallog. independent Eu³⁺ ions, one in a distorted monocapped square-antiprism and the other in a distorted square-antiprism coordination geometry. Complex 2 exhibits a three-dimensional (3-D) porous framework, with one type of Eu³⁺ in a distorted square-antiprism and the other in a trigondodecahedron environment. Both 1 and 2 emit the intensely red characteristic luminescence of Eu³⁺ ion at room temperature, with a long lifetime of up to 1.3 and 0.7 ms, resp., during which the ligand emission of EBTC^4-/BBTC^4- was quenched by the Eu³⁺ ion, indicating the existence of efficient energy transfer between the conjugated ligand of EBTC^4-/BBTC^4- and the Eu³⁺ ion. Thus, both EBTC^4- and BBTC^4- are ideal ligands with an “antenna” effect for the Eu³⁺ ion. The two complexes show the single-ion magnetic behaviors of Eu³⁺ with strong spin-orbit coupling interactions even if there are shorter distances (5.714 Å for 1 vs. 4.275 and 5.360 Å for 2) between the neighboring Eu³⁺ ions connected by oxygen atoms of the tetracarboxylates. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Formula: C12H10O4).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) 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. 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.Formula: C12H10O4

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

Dancing performance of organic droplets in aqueous surfactant solutions was written by Cejkova, Jitka;Schwarzenberger, Karin;Eckert, Kerstin;Tanaka, Shinpei. And the article was included in Colloids and Surfaces, A: Physicochemical and Engineering Aspects in 2019.Recommanded Product: Ethyl 2-hydroxybenzoate This article mentions the following:

Droplet systems remain the subject of a constant fascination in science and technol. Here we focus on organic droplets floating on the surface of aqueous surfactant solutions These droplets can exhibit intriguing interactions. Recently we have found independently in two laboratories that we can observe almost the same complex collective behavior in two different droplet systems. The aim of this paper is to compare both droplets systems, present their differences and show their similar oscillatory behavior. The first system consists of decanol droplets floating on a sodium decanoate solution In the second one, the droplets consist of a mixture of Et salicylate and liquid paraffin and they are placed on the surface of an aqueous sodium dodecyl sulfate solution Although the mechanism of these spatio-temporal interactions of droplets is not fully understood yet, we believe that this behavior is based on the same phenomena. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Recommanded Product: 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. 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.Recommanded Product: Ethyl 2-hydroxybenzoate

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

Effect of Spanish-style processing steps and inoculation with Lactobacillus pentosus starter culture on the volatile composition of cv. Manzanilla green olives was written by de Castro, Antonio;Sanchez, Antonio Higinio;Cortes-Delgado, Amparo;Lopez-Lopez, Antonio;Montano, Alfredo. And the article was included in Food Chemistry in 2019.Category: esters-buliding-blocks This article mentions the following:

The effects of the main steps of Spanish-style processing (alk. treatment and fermentation) on the volatile composition of cv. Manzanilla green olives were studied. Both spontaneous and controlled fermentations were considered. In the latter case, a Lactobacillus pentosus strain from green olive fermentation brine was used as starter culture. The volatile profile was determined by headspace solid-phase microextraction (HS-SPME) combined with gas chromatog.-mass spectrometry (GC-MS). Most of the volatile compounds detected in fresh olives decreased or were undetected after alk. treatment, while several compounds (mostly acetic acid, 2-methylbutanoic acid, and ethanol) were formed as a result of this treatment. Over 50 new volatile components, mostly esters and phenols, appeared as a result of fermentation The most outstanding finding was a considerable increase in 4-Et phenol (almost 100-fold increase) in inoculated olives compared to the uninoculated product. However, a sensory panel did not find significant differences in odor perception. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Category: esters-buliding-blocks).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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 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.Category: esters-buliding-blocks

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

Effect of the Melicoccus bijugatus leaf and fruit extracts and acidic solvents on the antimicrobial properties of chitosan-starch films was written by Juarez-Mendez, M. E.;Lozano-Navarro, J. I.;Velasco-Santos, C.;Perez-Sanchez, J. F.;Zapien-Castillo, S.;Del Angel-Moxica, I. E.;Melo-Banda, J. A.;Tijerina-Ramos, B. I.;Diaz-Zavala, N. P.. And the article was included in Journal of Applied Microbiology in 2021.Synthetic Route of C6H10O2 This article mentions the following:

Aim : Analyzing the antimicrobial activity-against food-borne micro-organisms-of modified chitosan-starch films using formic and acetic acid as chitosan solvents and Melicoccus bijugatus leaves and fruit extracts Methods and Results : The films’ antimicrobial activity against mesophilic aerobic bacteria, total coliform and fungi were also analyzed, in accordance with the Mexican Official Norms (NOM-092-SSA1-1994, NOM-111-SSA1-1994 and NOM-113-SSA1-1994). The pH values of the films and extracts were measured, and the volatile compounds of the extracts and two films were determined by Gas Chromatog.-Mass Spectrometry (GC-MS) considering the relationship among the type of compounds, extracts concentration, films’ pH and the antimicrobial activity against bacteria and fungi. The best results are obtained by films with formic acid and 10% (volume/volume) of leaf and fruit extracts, in comparison with untreated chitosan-starch films. Conclusions : The extracts’ compounds improved the films’ antimicrobial capacity and inhibited the growth of micro-organisms with no previous sterilization required. It is correlated to the pH of the media, the combination of solvent/extract used and its concentration Significance and Impact of the study : This is one of the few researches where the antimicrobial activity of M. bijugatus extracts is studied. It was found that the presence of these extracts is capable of improving the antimicrobial activities of chitosan-starch films. The performance of the modified films suggests their potential application as novel food packaging materials and encourages further research. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Synthetic Route of C6H10O2).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) 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. 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.Synthetic Route of C6H10O2

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

Differential volatile organic compounds signatures of apple juices from Madeira Island according to variety and geographical origin was written by Medina, Sonia;Perestrelo, Rosa;Santos, Rui;Pereira, Regina;Camara, Jose S.. And the article was included in Microchemical Journal in 2019.Electric Literature of C6H12O2 This article mentions the following:

One of the main food authenticity issues is related to products�false labeling concerning their variety or geog. origin. For this reason, the aim of this study was to establish distinctive characteristics for the discrimination of apple juices according to regional varieties (Rijo, Verde, Ribeiro and Azedo) and geog. origin (Prazeres and Santo da Serra (Madeira Island)) on the basis of their volatile pattern by headspace solid-phase microextraction combined with gas chromatog. mass spectrometry (HS-SPME/GC-MS) combined with chemometric tools. The results obtained revealed a perfect discrimination between the different apple varieties, with Rijo apple juices as samples with the major relative concentration of ethanol, Et butanoate, Et 2-methylbutanoate and Et hexanoate. Moreover, this study allowed a geog. origin-based classification of Azedo apple juices, highlighting Et acetate, 2-methyl-1-propanol, Et hexanoate, and toluene (described for the first time in apple juices) as discriminatory features. This study demonstrated that volatile organic compounds (VOCs) could serve as authenticity indicators to verify variety and geog. origin of apple juices, providing local producers multiple benefits and legal protection against misuse of the products. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Electric Literature of C6H12O2).

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. Electric Literature of C6H12O2

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