Tag: M.W=250-300

Wang, Chengliang; Zhang, Xu; Zhao, Wei; Liu, Xin; Wang, Qingfu; Sun, Jingjiang published the artcile< Synthesis of Aliphatic Hyperbranched Polycarbonates via Organo-Catalyzed ""A1+B2""-Ring-Opening Polymerization>, Reference of 112-63-0, the main research area is aliphatic hyperbranched polycarbonate organo catalyzed ring opening polymerization.

Hyperbranched aliphatic polycarbonates (HBPCs) have attracted significant attention in the field of biomedical application owing to their abundant end groups, biocompatibility, and nontoxic degradation products. However, their practical application is hampered by tedious synthesis procedures. The present work described a novel organo-catalyzed “”A1+B2″”-ring-opening polymerization (ROP) using a monofunctional primary alc. (A1) as an initiator and a bicyclic carbonate monomer (B2) for the straightforward synthesis of HBPCs under mild conditions. No gelation was observed up to 90% conversion of the cyclic carbonate ring. HBPCs with molar masses in the range from 7 to 20 kg/mol were obtained. Based on the “”A1+B2″”-ROP, HBPCs bearing a variety of functionalities including alkene, alkyne, aldehyde, furan, azide, and mPEG groups, which are of great significance in the field of click chem., have been successfully prepared by using functional alc. initiators. This polymerization strategy allowed for precise control over the HBPC structure: (1) the hyperbranched polymer (HBP) backbone can be adjusted by design of a bicyclic carbonate monomer with various linkages; (2) the use of an appropriate initiator leads to the introduction of functional end groups. Overall, the “”A1+B2″”-ROP provides an efficient method for preparing a variety of HBPs like hyperbranched polyester, polyether, polyphosphate, and poly(amino acid) with complex architectures in a single step.

Macromolecules (Washington, DC, United States) published new progress about Biocompatible materials. 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

Kyselka, Jan; Cihelkova, Klara; Lopes-Lutz, Daise; Chudoba, Josef; Vachalova, Tereza; Alishevich, Katsiaryna; Hradkova, Iveta; Bercikova, Marketa; Mikolaskova, Monika; Filip, Vladimir published the artcile< Mechanism Controlling High-Temperature Degradation of Sunflower Oil Triacylglycerols in the Absence of Oxygen>, Electric Literature of 112-63-0, the main research area is sunflower oil triacylglycerol temperature degradation oxygen absence.

The aim of the present study is to describe the mechanism controlling heat-induced formation of sunflower oil triacylglycerol and fatty acid Me ester oligomers. The unique combination of high-performance size-exclusion chromatog. with hyphenated electrospray ionization mass spectrometry (MS), atm. pressure chem. ionization-MS, and high-temperature gas chromatog.-MS techniques allows differentiating between radical coupling species and Diels-Alder cycloadducts. Targeted anal. of thermally degraded sunflower oils confirms the exact structures of various acyclic oligomers accompanied by less-abundant products of pericyclic transformations. A series of model experiments simulate the impact of dienophile nature on the course of Diels-Alder reactions. Thus, α-tocopherylquinone, δ-tocopherylquinone, and methyl-(E)-11-oxoundec-9-enoate are synthesized as naturally occurring dienophiles bearing electron-withdrawing groups. The geometry of poor dienophiles does not affect concerted cyclization, while the structure of electron deficient dienophiles can overcome low reactivity. In the absence of oxygen, heat-induced degradation of polyunsaturated triacylglycerols proceed predominantly via a radical pathway, whereas concerted reactions represent minor mechanisms. Sunflower oil triacylglycerol mols. in the system without propagation stage can be effectively protected by natural and/or synthetic antioxidants. Application of chelates is also recommended. However, antioxidant-derived quinones, such as α-tocopherylquinone, can enter the Diels-Alder reaction even more easily than dienophiles without electron-withdrawing groups. Unsaturated core aldehydes possess the same reactivity. Examination of the mechanism controlling high-temperature degradation of triacylglycerols is especially important for processing engineers in edible oil refineries and food technologists. New perspective may help them to minimize undesirable changes in polyunsaturated species.

European Journal of Lipid Science and Technology published new progress about Antioxidants. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Price, Daniel J.; Drewry, David H.; Schaller, Lee T.; Thompson, Brian D.; Reid, Paul R.; Maloney, Patrick R.; Liang, Xi; Banker, Periette; Buckholz, Richard G.; Selley, Paula K.; McDonald, Octerloney B.; Smith, Jeffery L.; Shearer, Todd W.; Cox, Richard F.; Williams, Shawn P.; Reid, Robert A.; Tacconi, Stefano; Faggioni, Federico; Piubelli, Chiara; Sartori, Ilaria; Tessari, Michela; Wang, Tony Y. published the artcile< An orally available, brain-penetrant CAMKK2 inhibitor reduces food intake in rodent model>, Product Details of C19H34O2, the main research area is diarylazaindole pharmacokinetics blood brain barrier CAMKK2 AMPK satiety obesity; CAMKK2; Inhibitor; Satiety.

Hypothalamic CAMKK2 represents a potential mechanism for chem. affecting satiety and promoting weight loss in clin. obese patients. Single-digit nanomolar inhibitors of CAMKK2 were identified in three related ATP-competitive series. Limited optimization of kinase selectivity, solubility, and pharmacokinetic properties were undertaken on all three series, as SAR was often transferrable. Ultimately, a 2,4-diaryl 7-azaindole was optimized to afford a tool mol. that potently inhibits AMPK phosphorylation in a hypothalamus-derived cell line, is orally bioavailable, and crosses the blood-brain barrier. When dosed orally in rodents, compound 4t limited ghrelin-induced food intake.

Bioorganic & Medicinal Chemistry Letters published new progress about Antiobesity agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Liu, Lili; Ma, Tianyi; Fang, Weiwei; Liu, Yuqing; Konstantinov, Kostantin; Wang, Jiazhao; Liu, Hua-Kun published the artcile< Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is silver nanocrystal nitrogen carbon encapsulation catalyst lithium oxygen battery.

A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber (NCF) is proposed, based on the simultaneous reaction between pyrrole and Ag+ ions in an aqueous solvent followed by a heat treatment. The as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and OER. Besides improved cycling stability, a much lower discharge/charge gap of 0.89 V (vs Li/Li+) compared with 1.38 V for NCF cathode with a fixed capacity of 500 mAh g-1 was obtained in lithium oxygen batteries. The introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics. X-ray diffraction anal. coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li2O2 formation and decomposition The NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active sites. The combined action between both contributes to the superior electrocatalytic performance.

Energy & Environmental Materials published new progress about Aqueous solutions. 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

More, Swati S.; Vince, Robert published the artcile< Inhibition of Glyoxalase I: The First Low-Nanomolar Tight-Binding Inhibitors>, Reference of 77215-54-4, the main research area is glutathione based peptide hydroxamate preparation low nanomolar inhibitor glyoxalase.

A series of rational modifications to the structure of known S-(N-aryl-N-hydroxycarbamoyl)glutathione-based glyoxalase I inhibitors culminated in the discovery of the first single-digit nanomolar inhibitor. This study makes available key information about possible means to address the issues of metabolic instability, low potency, and synthetic complexity that have plagued the area of glyoxalase I inhibition. Knowledge garnered from this study has implications in the design of inhibitors with higher conformational definition and lower peptidic character.

Journal of Medicinal Chemistry published new progress about Enzyme functional sites, active. 77215-54-4 belongs to class esters-buliding-blocks, and the molecular formula is C12H24N2O4, Reference of 77215-54-4.

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

Kamjam, Manita; Wongsawaeng, Doonyapong; Ngaosuwan, Kanokwan; Kiatkittipong, Worapon; Hosemann, Peter; Assabumrungrat, Suttichai published the artcile< Upgrading palm biodiesel properties via catalyst-free partial hydrogenation using needle-plate dielectric barrier discharge plasma torch>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is fatty acid methyl ester dielec barrier discharge partial hydrogenation.

Summary : SummaryA catalyst-free and ambient condition dielec. barrier discharge (DBD) plasma torch has been used to efficaciously synthesize partially hydrogenated fatty acid Me ester (H-FAME) obtained from refined palm oil. The electrode configuration was a needle-to-plate type. The effects of power, H2 flow rate, discharge gap, process temperature and reaction duration on H-FAME compositions and properties were examined For 1 h of reaction time, the optimal condition was 100 W input power, 1.0 L/min H2 flow rate, 1.0 cm discharge gap and 90°C reaction temperature Under this condition, the H-FAME contained saturated FAMEs of 56.8% and unsaturated FAMEs of 43.1%, compared to saturated FAMEs of 48.8% and unsaturated FAMEs of 51.0% in the feed FAME. After 1 h of treatment, the oxidation stability increased by 10.7 h (from 12.8 to 23.5 h), while the cloud point increased from 13.5 to 16.0°C. A reduction rate of iodine value was 13.4%/h (reduction from 50.6 to 43.8). The trans-fatty acid formation was not detected in the palm H-FAME. Partial hydrogenation through the DBD plasma torch without using artificial antioxidants or metal catalysts is an environment-friendly and potentially alternative approach, which can substitute conventional catalytic hydrogenation of FAME for enhancing the oxidation stability of biodiesel.

International Journal of Energy Research published new progress about Antioxidants. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Shono, Tatsuya; Nozoe, Tetsuo; Yamaguchi, Yoshihide; Ishifune, Manabu; Sakaguchi, Masashi; Masuda, Haruhisa; Kashimura, Shigenori published the artcile< Electroorganic chemistry. 133. A novel electroreductive alkylation of cycloheptatriene systems and its application to facile synthesis of β-thujaplicin>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is cycloheptatriene electroreductive alkylation; regioselective electroreductive alkylation cycloheptatriene; thujaplicin preparation electroreductive alkylation.

Electroreduction of cycloheptatriene or substituted cycloheptatrienes in the presence of an alkyl halide was found to be a unique and effective method for introducing regioselectively an alkyl group into seven-membered ring system and its was applied to a new synthesis of β-thujaplicin.

Tetrahedron Letters published new progress about Electrochemical reduction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Huang, Ying; Zhang, Jeff; Yu, Zhengtian; Zhang, Hailong; Wang, Youzhen; Lingel, Andreas; Qi, Wei; Gu, Justin; Zhao, Kehao; Shultz, Michael D.; Wang, Long; Fu, Xingnian; Sun, Yongfeng; Zhang, Qiong; Jiang, Xiangqing; Zhang, Jiangwei; Zhang, Chunye; Li, Ling; Zeng, Jue; Feng, Lijian; Zhang, Chao; Liu, Yueqin; Zhang, Man; Zhang, Lijun; Zhao, Mengxi; Gao, Zhenting; Liu, Xianghui; Fang, Douglas; Guo, Haibing; Mi, Yuan; Gabriel, Tobias; Dillon, Michael P.; Atadja, Peter; Oyang, Counde published the artcile< Discovery of First-in-Class, Potent, and Orally Bioavailable Embryonic Ectoderm Development (EED) Inhibitor with Robust Anticancer Efficacy>, Category: esters-buliding-blocks, the main research area is EED226 preparation polycomb repressive complex PRC2 EED inhibitor bioavailability.

Overexpression and somatic heterozygous mutations of EZH2, the catalytic subunit Polycomb repressive complex 2 (PRC2), are associated with several tumor types. EZH2 inhibitor, EPZ-6438 (Tazemetostat), demonstrated clin. efficacy in patients with acceptable safety profile as monotherapy. EED, another subunit of PRC2 complex, is essential for its histone methyltransferase activity through direct binding to trimethylated lysine 27 on histone 3 (H3K27Me3). Herein the authors disclose the discovery of a first-in-class potent, selective and orally bioavailable EED inhibitor EED226 (compound 43). Guided by x-ray crystallog., compound 43 discovered by fragmentation and regrowth of Compound (I), a PRC2 HTS hit that directly binds EED. Scaffold hopping followed by ensuing multi-parameter optimization led to the discovery compound 43. Compound 43 induces robust and sustained tumor regression in EZH2MUT pre-clin. DLBCL model. For the first time specific and direct inhibition of EED can be effective as an anti-cancer strategy.

Journal of Medicinal Chemistry published new progress about Antitumor agents. 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

Komudzinska, Marlena; Jozwiak, Malgorzata; Tyczynska, Magdalena; Burakowski, Andrzej; Glinski, Jacek published the artcile< The volume properties of selected glymes in N,N-dimethylformamide + water mixtures. The hydrophobic hydration process of glymes>, Category: esters-buliding-blocks, the main research area is glyme molar volume hydration.

This paper presents the d. of selected glymes (monoglyme, diglyme, triglyme and tetraglyme) in N,N-dimethylformamide + water mixtures at four temperatures: 293.15 K, 298.15 K, 303.15 K and 308.15 K. The d. data were used to calculate the apparent molar volumes (VΦ,m) and limiting apparent molar volumes (V0Φ,m = V0m), as well as the limiting molar expansion volume coefficient E0p,m. Changes in the obtained values of the physicochem. parameters, as functions of composition and temperature, were analyzed in terms of the mol. interactions and structural differentiation of the investigated systems. The process of hydrophobic hydration of the studied glymes is visible in the area of high water content in the mixture

Journal of Molecular Liquids published new progress about Density. 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

Lasitha, P.; Dasgupta, S.; Naresh Patwari, G. published the artcile< Unraveling the Origin of Differentiable 'Turn-On' Fluorescence Sensing of Zn2+ and Cd2+ Ions with Squaramides>, Product Details of C19H34O2, the main research area is zinc cadmium sensing fluorescence squaramide; density functional calculations; excited state dynamics; ligand-to-metal charge transfer; squaramides; ‘turn-on’ fluorescence sensing.

A squaramide ring conjugated with Schiff-bases decorated with hydroxy and methoxy functional groups differentially senses zinc and cadmium ions, which turn on the fluorescence. The feebly emitting free ligands light up in the presence of zinc and cadmium acetates, with the acetate ion playing a pivotal role as a conjugate anion. The selective and differentiable emission responses for zinc and cadmium ions make these ligands efficient multi-analyte sensing agents. Furthermore, these ligands could be used to differentially sense zinc and cadmium ions even in aqueous environments. The NMR studies reveal marginal differences in the binding of zinc and cadmium ions to the ligands, whereas d. functional theory calculations suggest the different extent of ligand-to-metal charge transfer (LMCT) contributes to the differential behavior. Finally, comparison of the excited-state dynamics of free ligand and the metal complexes reveal the appearance of longer lifetime (∼500-700 ps) component with complexation, due to rigidified mol. skeleton, thereby impeding the non-radiative processes.

ChemPhysChem published new progress about Density functional theory. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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