Tag: 200-300

Effects of Alkyl Chain Length of Aliphatic Dicarboxylic Ester on Degradation Properties of Aliphatic-Aromatic Water-Soluble Copolyesters for Warp Sizing was written by Li, Manli;Jin, Enqi;Qiao, Zhiyong;Zhao, Rongli. And the article was included in Fibers and Polymers in 2018.HPLC of Formula: 106-79-6 This article mentions the following:

In order to study the effects of alkyl chain length of aliphatic dicarboxylic ester (ADE) monomers on enzymic and hydrolytic degradation properties of aliphatic-aromatic water-soluble copolyesters for warp sizing, di-Me terephthalate, di-Me isophthalate-5-sulfonic sodium, and ADE monomers with various alkyl chain lengths were copolymerized through a two-step method, i.e. transesterification and polycondensation. The enzymic and hydrolytic degradation properties of the copolyesters were studied in terms of reduction rates of mol. weight, glass transition temperatures, and surface morphol. after being cultivated for 24-96 h. It was found that, enzymic degradation of the copolyesters strongly depended on alkyl chain length of ADE monomers. After being enzymically degraded for 96 h, reduction rate of mol. weight of the copolyester using di-Me malonate as ADE monomers could reach 22.2%. Meanwhile, the hydrolytic degradation of the copolyesters was not directly related to the alkyl chain length. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6HPLC of Formula: 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.HPLC of Formula: 106-79-6

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

Versatile Chemical Recycling Strategies: Value-Added Chemicals from Polyester and Polycarbonate Waste was written by Payne, Jack M.;Kamran, Muhammad;Davidson, Matthew G.;Jones, Matthew D.. And the article was included in ChemSusChem in 2022.HPLC of Formula: 106-79-6 This article mentions the following:

Zn^II-complexes bearing half-salan ligands were exploited in the mild and selective chem. upcycling of various com. polyesters and polycarbonates. Remarkably, we report the first example of discrete metal-mediated poly(bisphenol A carbonate) (BPA-PC) methanolysis being appreciably active at room temperature Indeed, Zn(2)₂ and Zn(2)Et achieved complete BPA-PC consumption within 12-18 mins in 2-Me-THF, noting high bisphenol A (BPA) yields (S_BPA=85-91%) within 2-4 h. Further kinetic anal. found such catalysts to possess k_app values of 0.28±0.040 and 0.47±0.049 min^-1 resp. at 4 wt%, the highest reported to date. A completely circular upcycling approach to plastic waste was demonstrated through the production of several renewable poly(ester-amide)s (PEAs), based on a terephthalamide monomer derived from bottle-grade poly(ethylene terephthalate) (PET), which exhibited excellent thermal properties. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6HPLC of Formula: 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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.HPLC of Formula: 106-79-6

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

Synthesis and structure of 3,7-dioxa-1-phosphabicyclo[3.3.1]nonanes was written by Oehme, H.;Leissring, E.;Meyer, H.. And the article was included in Zeitschrift fuer Anorganische und Allgemeine Chemie in 1980.Computed Properties of C11H20O4 This article mentions the following:

2,2-Bis(hydroxymethyl)-1-isopropylethylphosphine and 2,2-bis(hydroxymethyl)-1,1-dimethylethylphosphine, prepared by LiAlH₄ reduction of the appropriate 1-phosphonoalkylmalonate, react with BzH and anisaldehyde according to an acid catalyzed O,P-cycloacetalization to give dioxaphosphabicyclononane I (R¹ = H, R² = Me₂CH, R = Ph; R¹ = R² = Me, R = Ph, p-anisyl). Aliphatic aldehydes under the same conditions do not form the bicyclic system but give dioxanes II (R = Me, Et, Et₃C). The mechanism of the cyclocondensation reaction is discussed based on an alkoxycarbenium ion transition state. Although the relative configuration of the C-2,8-atoms could not really be proved, in particular the PH coupling constants indicate the C-2,8-protons to occupy the exo-positions. In the experiment, the researchers used many compounds, for example, Diethyl isobutylmalonate (cas: 10203-58-4Computed Properties of C11H20O4).

Diethyl isobutylmalonate (cas: 10203-58-4) 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.Computed Properties of C11H20O4

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

Molecular characterization of primary humic-like substances in fine smoke particles by thermochemolysis-gas chromatography-mass spectrometry was written by Fan, Xingjun;Wei, Siye;Zhu, Mengbo;Song, Jianzhong;Peng, Ping’an. And the article was included in Atmospheric Environment in 2018.Recommanded Product: Dimethyl decanedioate This article mentions the following:

The mol. structures of primary humic-like substances (HULIS) in fine smoke particles emitted from the combustion of biomass materials (including rice straw, corn straw, and pine branches) and coal, and atm. HULIS were determined by off-line tetramethylammonium hydroxide thermochemolysis coupled with gas chromatog. and mass spectrometry (TMAH-GC/MS). A total of 89 pyrolyzates were identified by the thermochemolysis of primary and atm. HULIS. The main groups were polysaccharide derivatives, N-containing compounds, lignin derivatives, aromatic acid Me ester, aliphatic acid Me ester, and diterpenoid derivatives The aromatic compounds, including lignin derivatives and aromatic acid Me ester, were the major pyrolyzates (53.0%-84.9%) in all HULIS fractions, suggesting that primary HULIS significantly contributed aromatic structures to atm. HULIS. In addition, primary HULIS from biomass burning (BB) contained a relatively high abundance of lignin and polysaccharide derivatives, which is consistent with the large amounts of lignin and cellulose structures contained in biomass materials. Aliphatic acid Me ester and benzyl Me ether were prominent pyrolyzates in atm. HULIS. Diterpenoid derivatives are important markers of HULIS from pine wood combustion sources. The differences in pyrolyzate types and the distributions between primary and atm. HULIS suggested that the primary HULIS would undergo many atm. processes to reconstruct the macromol. organic matter in atm. aerosols. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Recommanded Product: Dimethyl decanedioate).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.Recommanded Product: Dimethyl decanedioate

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

Comprehensive characterization of the chemical composition of Lurong dabu decoction and its absorbed prototypes and metabolites in rat plasma using UHPLC-Q Exactive Orbitrap-HRMS was written by Jin, Yueying;Cheng, Shengyu;Liu, Ruobai;Yu, Chenglong;Zhang, Lingli;Li, Xi-Ling;Yan, Guanghai;Zheng, Mingyu;Zhe Min, Jun. And the article was included in Food Research International in 2022.Product Details of 106-79-6 This article mentions the following:

Lurong Dabu decoction (LRDBD) is an effective traditional Chinese Korean ethnic medicine prescription composed of eight herbs, which is used for treating asthma. However, its material basis has not been studied yet. Herein, the use of a new and highly sensitive UHPLC-Q Exactive Orbitrap-HRMS technique is proposed for the high-resolution and accurate identification of the material basis of LRDBD. We identified 122 compounds belonging to different groups in LRDBD. Among these, 23 ingredients produced by decoction were identified and compared with 8 single herb compounds Moreover, 39 other significantly different compounds were identified. Addnl., 29 absorbed prototype components and 35 metabolites were identified in rat plasma. Half of the prototype components were originated from antler velvet, it has corroborated the compatibility theory of Sasang medicine. To the best of our knowledge, the material basis of LRDBD was characterized for the first time. Our findings provide basic data and a method for further discovering potential drug targets and revealing the action mechanism of LRDBD in asthma treatment. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Product Details of 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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.Product Details of 106-79-6

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

Self-assembly behavior of amphiphilic diblock copolymer PS-b-P4VP in CO₂-expanded liquids was written by Cheng, Xiaomeng;Jiao, Dongxia;Liang, Zhihao;Wei, Jinjin;Li, Hongping;Yang, Junjiao. And the article was included in Wuli Huaxue Xuebao in 2018.Application In Synthesis of Benzyl benzodithioate This article mentions the following:

The self-assembly behavior of block copolymers and their assembled micellar morphologies have attracted considerable attention because of their potential applications in biomedicine, drug delivery, and catalysis. Herein we report that CO₂-expanded liquids (CXLs) facilitate the morphol. control of the self-assembled aggregates (SAAs) of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) formed in CO₂-expanded toluene. The anti-solvent effect of CXLs can successfully regulate the self-assembly behavior of the copolymer PS-b-P4VP. The difference in amphiphilicity between PS and P4VP block is reduced with increasing pressure of CO₂-expanded toluene owing to the anti-solvent effect of CO₂. In addition, this diminished difference may influence the interfacial tension at the P4VP core-PS corona interface, which triggers a morphol. change of the aggregate. The SAA structures are dependent on both CXL pressure and copolymer composition under the exptl. conditions implemented in this work. The morphol. evolution of the SAAs in CXLs exhibits remarkable pressure dependence. As the pressure increases, the SAA structure of PS₁₆₈-b-P4VP₄₂₀ transits from primarily spheres (0.1 MPa) to mostly interconnected rods (6.35 MPa), the SAA of PS₇₉₀-b-P4VP₂₆₃ evolves from small vesicles (0.1 MPa) to large compound vesicles (LCVs, 6.35 MPa), whereas the PS₁₅₃-b-P4VP₁₅₃₀ counterpart switches from large compound micelles (LCMs, 0.1 MPa) to mainly large compound vesicles (LCVs, 6.35 MPa). Moreover, transmission electron microscopy (TEM) data on constant copolymer composition implies that the packing parameter p of the SAAs increases with the CXLs pressure. Especially, under the exptl. conditions employed in this work, we find that the major factor controlling the SAA shape in conventional toluene is the copolymer composition, while in CO₂-expanded toluene, the dominant factor controlling the SAA morphol. might be the varying contact area between shell-forming segment PS and the CXLs with increasing pressure. This work proves that the CXL method facilitates the modulation of morphol. of the SAAs, and opens a green route for the development of new nano-functional materials. 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. 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. 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 In Synthesis of Benzyl benzodithioate

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

Ethanol metabolism in guinea pig: ethanol oxidation and its effect on NAD/NADH ratios, oxygen consumption, and ketogenesis in isolated hepatocytes of fed and fasted animals was written by Zahlten, Rainer N.;Nejtek, Michael E.;Jacobsen, Jan. C.. And the article was included in Archives of Biochemistry and Biophysics in 1982.HPLC of Formula: 1190-39-2 This article mentions the following:

EtOH [64-17-5]-induced decrease of the mitochondrial NAD鑱借伣[53-84-9]/NADH鑱借伣[58-68-4] ratio was prevented by the addition of 4-methylpyrazole鑱借伣[7554-65-6]. In 48-h hepatocytes, endogenous ketogenesis was enhanced by 84%. Although EtOH did not further stimulate endogenous ketogenesis, it did increase ketogenesis in the presence of octanoate鑱借伣[74-81-7] or oleate鑱借伣[112-80-1]. This effect was almost completely prevented by 4-methylpyrazole. Also, the malic鑱?em>acid鑱借伣[6915-15-7]–aspartate鑱借伣[56-84-8] shuttle was the predominant H transport system during EtOH oxidation in guinea pig liver and a quant. important role of peroxidatic oxidation of EtOH by catalase鑱借伣[9001-05-2] in liver was not supported. Thus, the syndrome of alc. ketoacidosis may be due, at least partially, to the addnl. stimulation of ketogenesis by or from EtOH during fatty acid oxidation in the fasting state. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2HPLC of Formula: 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) 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 绾?valerolactone.HPLC of Formula: 1190-39-2

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

Radical Aza-Cyclization of 浼?Imino-oxy Acids for Synthesis of Alkene-Containing N-Heterocycles via Dual Cobaloxime and Photoredox Catalysis was written by Tu, Jia-Lin;Liu, Jia-Li;Tang, Wan;Su, Ma;Liu, Feng. And the article was included in Organic Letters in 2020.Synthetic Route of C12H14O3 This article mentions the following:

Nitrogen-containing heterocycles are prevalent in both naturally and synthetically bioactive mols. We report herein an unprecedented protocol for radical aza-cyclization of 浼?imino-oxy acids with pendant alkenes via synergistic photoredox and cobaloxime catalysis. With or without alkenes as the intermol. cross-coupling partners, the transformation provides a variety of corresponding alkene-containing dihydropyrrole products in satisfactory yields. In the presence of external alkenes, the tandem reaction generates E-selective coupling products with excellent chemo- and stereoselectivity. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Synthetic Route of C12H14O3).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) 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. 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.Synthetic Route of C12H14O3

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

One-pot synthesis of 5-alkylthio-3H-1,2-dithiole-3-thiones was written by Aimar, Mario L.;Rossi, Rita H.. And the article was included in Tetrahedron Letters in 1996.Application In Synthesis of malonic acid dibutyl ester This article mentions the following:

Dialkyl malonate esters RO₂CCHR¹CO₂R (R = Et, n-Bu, n-octyl, R¹ = H; R = Et, R¹ = PhCH₂) reacted with P₂S₅/S₈ in boiling xylene and with 2-mercaptobenzothiazole/ZnO as catalyst to yield 5-alkylthio-3H-1,2-dithiole-3-thiones I as major products. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Application In Synthesis of malonic acid dibutyl ester).

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. 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. Application In Synthesis of malonic acid dibutyl ester

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

Self-assembled sulfated zirconia nanocrystals with mesoscopic void space synthesized via ionic liquid as a porogen and its catalytic activity for the synthesis of biodiesels was written by Banerjee, Biplab;Bhunia, Subhajit;Bhaumik, Asim. And the article was included in Applied Catalysis, A: General in 2015.HPLC of Formula: 106-79-6 This article mentions the following:

Self-assembled ZrO₂ nanocrystals have been synthesized through a facile chem. route via steam-assisted ionothermal method using 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) as a porogen. The template-free material has been sulfonated by 1(N) H₂SO₄ at room temperature followed by calcination in air at 723 K. Both ZrO₂ and the sulfated zirconia are thoroughly characterized by powder X-ray diffraction (PXRD), ultra high-resolution transmission electron microscopy (UHR-TEM), Fourier transform IR spectroscopy (FT-IR), FE-SEM, N₂ sorption, and NH₃-TPD analyses. The sulfated material has been employed as efficient and environmentally benign heterogeneous catalyst for the synthesis of biodiesels based on long chain fatty acid esters. The catalyst can be easily recovered and reused at least for five times without significant decrease in its catalytic activity. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6HPLC of Formula: 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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.HPLC of Formula: 106-79-6

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