Category: esters-buliding-blocks

Vadkerti, Bence; Juhasz, Anett; Lakatos, Csilla; Zsuga, Miklos; Keki, Sandor; Nagy, Lajos published the artcile< Reactivity of multi-arm polyols towards isocyanates>, SDS of cas: 112-63-0, the main research area is multi arm polyol isocyanate crosslinking agent UV absorption.

In this research, the kinetics of the reaction of various polymer polyol crosslinking agents with Ph isocyanate is reported. Pentaerythritol (PE), trimethylol propane (TMP), ethoxylated (PEEO) and propoxylated (PEPO) pentaerythritol oligomers as well as Petol PA 500-5D (a propoxylated diethylenetriamine with 5 arms) were used as crosslinking agents. These polyols were applied in high molar excess to isocyanate to obtain pseudo first-order rate dependencies. The reaction products were separated by HPLC and detected by UV absorption. In addition, Petol PA 500-5D was determined to be the most reactive polyol, which is ascribed to the fact that it carries some catalytic properties similar to other tertiary amine catalysts. Furthermore, the reactions were also carried out in high isocyanate molar excess to polyols in order to determine how the number of reacted hydroxyl groups influences the reactivity of unreacted hydroxyl groups. The separation of the products could be achieved by HPLC for PE and TMP; however, in the case of PEEO, PEPO and Petol PA 500-5D, due to the high number of products, MALDI-TOF MS was applied. The results clearly showed that the reactivity of the unreacted OH groups significantly changed upon reaction in the case of PE and TMP, while for the polymer polyols, steric and inductive effects slightly modified the relative reactivities of the OH groups in each crosslinking agent.

New Journal of Chemistry published new progress about Polyoxyalkylenes Role: PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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

Zheng, Yongfeng; Liang, Chunhong; Li, Ziwei; Chen, Jiao; Chen, Zhuoping; Jiang, Yanping; Dong, Qin; Xiao, Yujie; Fu, Chaomei; Liao, Wan; Yuan, Xing published the artcile< Study on the mechanism of Huangqin Decoction on rats with ulcerative colitis of damp-heat type base on mtDNA, TLR4, p-PI3K, p-Akt protein expression and microbiota>, Synthetic Route of 112-63-0, the main research area is Huangqin decoction antiinflammatory mitochondrial DNA TLR4 expression ulcerative colitis; Damp-heat ulcerative colitis; Huangqin decoction; Intestinal microbiota; Mitochondrial DNA; TLR4; p-Akt and p-PI3K.

Huangqin decoction (HQD), composed of Scutellaria(Huangqin), Peony(Shaoyao), Liquorice(Gancao) and Jujube(Dazao), is a traditional Chinese medicine prescription, originated from treatise on Febrile Diseases, has the functions of clearing heat, stopping benefits and relieving pain. It is the original prescription for treating heat and relieving dysentery, and is commonly used in clinic for diarrhea and other diseases. In ulcerative colitis, damp-heat syndrome is the most common. However, its mechanism of action is not completely clear. The purpose of the research is to investigate the protective effect of HQD on ulcerative colitis rats and the regulation effect of mitochondrial DNA, TLR4, p-Akt, p-PI3K protein and microbiota. The effects of HQD anti-UC were investigated by fluorescence quant. PCR, cytokine level and histopathol. anal. in DSS-induced ulcerative colitis (UC) rats. The content of mtDNA in colon epithelial cells of rats in each group was detected by fluorescence quant. PCR, p-PI3K, p-Akt and TLR4 protein expressions in colon tissues of rats in each group were detected by Western blotting. IL-6, IL-17 and IL-23 inflammatory factors were detected by ELISA. The effect of HQD on intestinal microbiota of rats with ulcerative colitis was studied by high-throughput sequencing technol., and the correlation between mtDNA level and inflammatory factors as well as protein expression in colonic epithelium of rats with ulcerative colitis was analyzed by SPSS23.0. HQD significantly alleviated UC symptoms by improving the mucosal intestinal epithelial cell structure, mental state, hair gloss, fecal occult blood, lamina propria intestinal glands and inflammatory cell infiltration. And HQD reduced the pro-inflammatory cytokines in the colonic epithelium of UC rats Production of IL-6, IL-17 and IL-23. The HE stained section of colon tissue showed a complete intestinal epithelial mucosal layer structure. The structure of epithelial cells was more normal and abundant. There were more goblet cells in lamina propria adenoma, which improved the infiltration of inflammatory cells. HQD significantly inhibited the mtDNA content in rat colonic epithelial tissue, and significantly inhibited the expression of TLR4, p-PI3K and p-Akt inflammatory signaling pathways. The results of the microbiota experiment showed that the abundance of HQD in the phylum Firmicutes increased, and the number of Bacteroides phylum decreased (p < 0.05). At the genus level, HQD significantly increased Lactobacillus and Firmicutes Bacteroides, while Treponema and Bacteroides were significantly reduced (p < 0.05). HQD has a certain protective effect on rats with damp heat ulcerative colitis. Its mechanism may be related to regulating the expression of p-PI3K, p-Akt and TLR4 proteins, mitochondrial DNA as well as microbiota. Journal of Ethnopharmacology published new progress about Chinese medicine. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Seebach, Dieter; Maestro, Miguel A.; Sefkow, Michael; Adam, Geo; Hintermann, Samuel; Neidlein, Axel published the artcile< Total synthesis of Myxovirescins. 1. Strategy and construction of the ""southeastern"" part [O(1)-C(14)]>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is myxovirescin total synthesis.

In this and the following two papers the synthesis of myxovirescins A1, A2 and M2, 28-membered macrocyclic lactam-lactones with antibiotic activity, is described. A retrosynthetic anal. of the myxovirescin family of ca. 30 target mols. leads to a strategy which could be applied to approx. half of them by slight variations of the building blocks used. The southeastern part of the mol., containing the atoms O(1)-C(14) of myxovirescins A and M is described in this first paper. The assembly is achieved by using the following appropriately protected units: (S)-2-hydroxy-pentanoic acid, ([1,3]dithian-2-ylmethyl)-amine, the triflate of (S,R)-2,2-dimethyl-5-vinyl-[1,3]dioxolan-4-ylmethanol, (E)-3-bromo-2-buten-1-ol, and (E)-2-bromo-2-buten-1,4-diol, the starting materials for these being malic acid, aminoacetaldehyde, ribose, crotyl alc. and butyne-1,4-diol. The building blocks are put together by using the following key steps: Kolbe electrolysis, amide formation, lithiodithiane alkylation, and Suzuki coupling. The only newly created chirality center [C(6) of the target mols.] is generated stereoselectively by a Li-selectride reduction/Mitsunobu inversion. The termini of the O(1)-C(14) fragment, I (X = H, OMe), carry a (protected) hydroxy acid and an aldehyde group for the Julia coupling and lactonization, resp., in the final steps of the synthesis. All intermediates are fully characterized. The x-ray crystal structures of two compounds prepared for incorporation as N(4)-C(11) and as C(12)-C(14) of the target mols. are also described.

Liebigs Annalen der Chemie published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Ma, Jianze; Huang, You; Chen, Ruyu published the artcile< N-Heterocyclic carbene-catalyzed (NHC) three-component domino reactions: highly stereoselective synthesis of functionalized acyclic ε-ketoesters>, Category: esters-buliding-blocks, the main research area is aryl ketoester diastereoselective synthesis; unsaturated aryl aldehyde chalcone propargyl alc three component reaction; heterocyclic carbene catalyst.

A novel NHC-catalyzed three-component domino strategy to access high functionalized cis-ε-ketoesters with excellent yields (up to 98%) and high stereoselectivities (up to 20:1) is documented. The title domino reactions are atom economical and work on a broad range of substrates. The relative stereochem. could be explained by a cascade crossed-benzoin/oxy-Cope rearrangement/esterification process. The thus-obtained products are of potential synthetic value in the drug research and combinatorial chem.

Organic & Biomolecular Chemistry published new progress about Chalcones Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

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

Chen, Yu-Xiang; Wu, Chien-Wei; Kuo, Ting-Yang; Chang, Yu-Lung; Jen, Ming-Hsing; Chen, I-Wen Peter published the artcile< Large-Scale Production of Large-Size Atomically Thin Semiconducting Molybdenum Dichalcogenide Sheets in Water and Its Application for Supercapacitor>, Computed Properties of 112-63-0, the main research area is molybdenum dichalcogenide semiconducting sheet water supercapacitor.

To progress from laboratory research to com. applications, it is necessary to develop an effective method to prepare large quantities and high-quality of the large-size atomically thin molybdenum dichalcogenides (MoS2). Aqueous-phase processes provide a viable method for producing thin MoS2 sheets using organolithium-assisted exfoliation; unfortunately, this method is hindered by changing pristine semiconducting 2H phase to distorted metallic 1T phase. Recovery of the intrinsic 2H phase typically involves heating of the 1T MoS2 sheets on solid substrates at high temperature This has restricted and hindered the utilization of 2H phase MoS2 sheets suspensions. Here, we demonstrate that the synergistic effect of the rigid planar structure and charged nature of organic salt such as imidazole (ImH) can be successfully used to produce atomically thin 2H-MoS2 sheets suspension in water. Moreover, lateral size and area of the exfoliated sheet can be up to 50 μm and 1000 μm2, resp. According to the XPS measurements, nearly 100% of the 2H-MoS2 sheets was successfully prepared A composite paper supercapacitor using the exfoliated 2H-MoS2 and carbon nanotubes delivered a superior volumetric capacitance of ∼410 F/cm3. Therefore, the organic salts-assisted liquid-phase exfoliation has great potential for large-scale production of 2H-MoS2 suspensions for supercapacitor application.

Scientific Reports published new progress about Carbon nanotubes. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

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

Huang, Yansong; Jin, Yujuan; Wang, Bo; Tian, Huafeng; Weng, Yunxuan; Sun, Kangdi; Men, Shuang published the artcile< Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long-chain hyperbranched polymers>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is compatibilized toughened polylactide cellulose acetate hyperbranched polymer.

A type of long-chain hyperbranched polymers (LCHBPs) was prepared by grafting hydroxyl-terminated flexible long chain onto hyperbranched polymers (HBPs). The structure of LCHBPs was confirmed by Fourier transform IR (FT-IR) and NMR (1H-NMR) anal. It was then used as the modifier for toughening and compatibilizing the polylactic acid (PLA)/cellulose acetate (CA) blends. Upon the addition of LCHBPs, the compatibility between PLA and CA was improved, the dispersion of CA particles in PLA matrix was more uniform, and the brittle-ductile tear transition of the PLA/CA blends was occurred. The crystallization of PLA was promoted by the addition of LCHBPs. By adding LCHBPs, glass transition temperature and cold crystallization temperature were reduced, the crystallizability was enhanced, and the crystallization temperature range was expanded. The thermal decomposition temperature of the PLA/CA was found increased with the addition of LCHBPs. When the content of LCHBPs was 1 phr, the elongation at break and the tear strength of the PLA/CA blends were increased by 484% and 38.24%, resp. Meanwhile, the thermal stability and hydrophilic properties of the blend films were improved by adding LCHBPs.

Journal of Applied Polymer Science published new progress about Crystallization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Chernov, Alexandr N.; Tsapieva, Anna; Alaverdian, Diana A.; Filatenkova, Tatiana A.; Galimova, Elvira S.; Suvorova, Mariia; Shamova, Olga V.; Suvorov, Alexander N. published the artcile< In Vitro Evaluation of the Cytotoxic Effect of Streptococcus pyogenes Strains, Protegrin PG-1, Cathelicidin LL-37, Nerve Growth Factor and Chemotherapy on the C6 Glioma Cell Line>, Application In Synthesis of 112-63-0, the main research area is anticancer PG1 LL37 NGF chemotherapy cytotoxicity Streptococcus glioma; LL-37; MTT assay; NGF; PG-1; Streptococcus pyogenes; cathelicidin family peptides; chemotherapy; cytotoxicity; glioma C6; human normal fibroblasts; real-time xCELLigence system; trypan blue assay.

Brain cancer treatment, where glioblastoma represents up to 50% of all CNS malignancies, is one of the most challenging calls for neurooncologists. The major driver of this study was a search for new approaches for the treatment of glioblastoma. We tested live S. pyogenes, cathelicidin family peptides and NGF, assessing the oncolytic activity of these compounds as monotherapy or in combination with chemotherapeutics. For cytotoxicity evaluation, we used the MTT assay, trypan blue assay and the xCELLigence system. To evaluate the safety of the studied therapeutic approaches, we performed experiments on normal human fibroblasts. Streptococci and peptides demonstrated high antitumor efficiency against glioma C6 cells in all assays applied, surpassing the effect of chemotherapeutics (doxorubicin, carboplatin, cisplatin, etoposide). A real-time cytotoxicity anal. showed that the cell viability index dropped to 21% 2-5 h after S. pyogenes strain exposure. It was shown that LL-37, PG-1 and NGF also exhibited strong antitumor effects on C6 glioma cells when applied at less than 10-4 M. Synergistic effects for combinations of PG-1 with carboplatin and LL-37 with etoposide were shown. Combinations of S. pyogenes strain #7 with NGF or LL-37 demonstrated a cytotoxic effect (56.7% and 57.3%, accordingly) on C6 glioma cells after 3 h of exposure.

Molecules published new progress about Antitumor agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application In Synthesis of 112-63-0.

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

Orita, Akihiro; Tanahashi, Chiaki; Kakuda, Atsushi; Otera, Junzo published the artcile< Highly Powerful and Practical Acylation of Alcohols with Acid Anhydride Catalyzed by Bi(OTf)3>, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate, the main research area is alc acylation anhydride bismuth triflate catalyst.

Bi(OTf)3-catalyzed acylation of alcs. with acid anhydride was evaluated in comparison with other acylation methods. The Bi(OTf)3-acid anhydride protocol was so powerful that sterically demanding or tertiary alcs. could be acylated smoothly. Less reactive acylation reagents such as benzoic and pivalic anhydride are also activated by this catalysis. In these cases, a new technol. was developed in order to overcome difficulty in separation of the acylated product from the remaining acylating reagent: methanolysis of the unreacted anhydride into easily separable Me ester realized quite easy separation of the desired acylation product. The Bi(OTf)3-acid anhydride protocol was applicable to a wide spectrum of alcs. bearing various functionalities. Acid-labile THP- or TBS-protected alc., furfuryl alc., and geraniol could be acylated as well as base-labile alcs. Even acylation of functionalized tertiary alcs. was effected at room temperature

Journal of Organic Chemistry published new progress about Acylation. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate.

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

Saini, Nipun; Virdee, Manjot S.; Helfrich, Kaylee K.; Kwan, Sze Ting Cecilia; Mooney, Sandra M.; Smith, Susan M. published the artcile< Untargeted Metabolome Analysis Reveals Reductions in Maternal Hepatic Glucose and Amino Acid Content That Correlate with Fetal Organ Weights in a Mouse Model of Fetal Alcohol Spectrum Disorders>, Reference of 112-63-0, the main research area is FASD maternal hepatic glucose amino acid metabolome analysis; amino acids; fetal weight; gluconeogenesis; glucose; hepatic metabolism; maternal–fetal metabolism; pregnancy; prenatal alcohol exposure; untargeted metabolomics.

Prenatal alc. exposure (PAE) causes fetal growth restrictions. A major driver of fetal growth deficits is maternal metabolic disruption; this is under-investigated following PAE. Untargeted metabolomics on the dam and fetus exposed to alc. (ALC) revealed that the hepatic metabolome of ALC and control (CON) dams were distinct, whereas that of ALC and CON fetuses were similar. Alc. reduced maternal hepatic glucose content and enriched essential amino acid (AA) catabolites, N-acetylated AA products, urea content, and free fatty acids. These alterations suggest an attempt to minimize the glucose gap by increasing gluconeogenesis using AA and glycerol. In contrast, ALC fetuses had unchanged glucose and AA levels, suggesting an adequate draw of maternal nutrients, despite intensified stress on ALC dams. Maternal metabolites including glycolytic intermediates, AA catabolites, urea, and one-carbon-related metabolites correlated with fetal liver and brain weights, whereas lipid metabolites correlated with fetal body weight, indicating they may be drivers of fetal weight outcomes. Together, these data suggest that ALC alters maternal hepatic metabolic activity to limit glucose availability, thereby switching to alternate energy sources to meet the high-energy demands of pregnancy. Their correlation with fetal phenotypic outcomes indicates the influence of maternal metabolism on fetal growth and development.

Nutrients published new progress about Alcohols Role: ADV (Adverse Effect, Including Toxicity), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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

Hsu, Day-Shin; Liang, Suz-Ping published the artcile< NHC-Mediated Synthesis of Tricyclic Spirocarbocycles via an Intramolecular Stetter Reaction of Cyclic Enal-Enones>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is tricyclic spirocarbocycle preparation; cyclic enal enone intramol Stetter reaction nitrogen heterocyclic carbene.

A general and efficient method for the synthesis of tricyclic spirocarbocycles is described. Various cyclic enal-enones were reacted with an N-heterocyclic carbene and an intramol. Stetter reaction proceeded smoothly to give various tricyclic spiro-1,4-diketones in 31-72% yields. The ring size of the spiro compounds can be easily controlled using different cyclic enals and enones, or by altering the length of the carbon tether.

Journal of Organic Chemistry published new progress about Diketones Role: SPN (Synthetic Preparation), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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