Tag: M.W=250-300

Brouwer, Chad; Jenko, Kimberly J.; Zoghbi, Sami S.; Morse, Cheryl L.; Innis, Robert B.; Pike, Victor W. published the artcile< Translocator protein ligands based on N-methyl-(quinolin-4-yl)oxypropanamides with properties suitable for PET radioligand development>, Related Products of 112-63-0, the main research area is quinolinyl oxypropanamide preparation PET imaging radioligand; Binding affinity; Carbon-11; Ligand; Lipophilic efficiency; PET; Translocator protein.

Modifications to an N-methyl-(quinolin-4-yl)oxypropanamide scaffold were explored to discover leads for developing new radioligands for PET imaging of brain TSPO (translocator protein), a biomarker of neuroinflammation. Whereas contraction of the quinolinyl portion of the scaffold or cyclization of the tertiary amido group abolished high TSPO affinity, insertion of an extra nitrogen atom into the 2-arylquinolinyl portion was effective in retaining sub-nanomolar affinity for rat TSPO, while also decreasing lipophilicity to within the moderate range deemed preferable for a PET radioligand. Replacement of a Ph group on the amido nitrogen with an iso-Pr group was similarly effective. Among others, compound 20 (N-methyl-N-phenyl-2-[2-(pyridin-2-yl)-1,8-naphthyridin-4-yloxy]propanamide) appears especially appealing for PET radioligand development, based on high selectivity and high affinity (Ki = 0.5 nM) for rat TSPO, moderate lipophilicity (logD = 2.48), and demonstrated amenability to labeling with carbon-11.

European Journal of Medicinal Chemistry published new progress about Brain. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Alizadeh, Nima; Thorne, David P.; Auad, Maria L.; Celestine, Asha-Dee N. published the artcile< Mechanical performance of vinyl ester-polyurethane interpenetrating polymer network composites>, Quality Control of 112-63-0, the main research area is carbon fiber vinyl ester polyurethane interpenetrating polymer network composite.

In this study, a carbon fiber/vinyl ester-polyurethane interpenetrating polymer network (IPN) laminate composite was fabricated and characterized for the first time. The IPN matrix, consisting of a com. available vinyl ester and polyurethane, was synthesized via a sequential method with vinyl ester as the rigid phase and polyurethane as the flexible phase. Good compatibility between the two phases in the matrix was achieved and confirmed via differential scanning calorimetry and dynamic mech. anal. The thermomech. response of the IPN matrix was compared with that of an unmodified vinyl ester resin. The presence of the more ductile polyurethane in the IPN matrix depressed the glass transition temperature (from 94 to 84°C), but also served to improve damping response at all frequencies studied. Tensile and flexural tests were performed on the carbon fiber/IPN and carbon fiber/vinyl ester composites to determine their mech. response. The IPN composite exhibited lower tensile properties than the vinyl ester composite. However, its flexural properties were on par with those of the vinyl ester composite.

Journal of Applied Polymer Science published new progress about Bending strength. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

de Oliveira, I. S. S.; Miwa, R. H. published the artcile< Organic molecules deposited on graphene: A computational investigation of self-assembly and electronic structure>, Formula: C19H34O2, the main research area is graphene adsorption tetracyanoquinodimethane tetrafluorotetracyanoquinodimethane tetrasodium pyrenetetrasulfonate self assembly DFT.

The authors use ab initio simulations to study the adsorption and the self-assembly processes of tetracyanoquinodimethane (TCNQ), tetrafluoro-tetracyanoquinodimethane (F4-TCNQ), and tetrasodium 1,3,6,8-pyrenetetrasulfonic acid (TPA) on the graphene surface. There are no chem. bonds at the mol.-graphene interface, even at the presence of grain boundaries on the graphene surface. The mols. bond to graphene through van der Waals interactions. In addition to the mol.-graphene interaction, the authors performed a detailed study of the role played by the (lateral) mol.-mol. interaction in the formation of the, exptl. verified, self-assembled layers of TCNQ and TPA on graphene. Regarding the electronic properties, the authors calculate the electronic charge transfer from the graphene sheet to the TCNQ and F4-TCNQ mols., leading to a p-doping of graphene. Meanwhile, such charge transfer is reduced by an order of magnitude for TPA mols. on graphene. In this case, it is not expected a significant doping process upon the formation of self-assembled layer of TPA mols. on the graphene sheet. (c) 2015 American Institute of Physics.

Journal of Chemical Physics published new progress about Adsorption. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Jitian, Simion; White, Samuel R.; Yang, H.-H. Wendy; Weisz, Adrian published the artcile< Conventional high-performance liquid chromatography versus derivative spectrophotometry for the determination of 1,3,6-pyrenetrisulfonic acid trisodium salt and 1,3,6,8-pyrenetetrasulfonic acid tetrasodium salt in the color additive D&C Green Number 8 (Pyranine)>, SDS of cas: 112-63-0, the main research area is pyranine Green 8 P3S P4S derivative spectrophotometry HPLC; 1,3,6,8-Pyrenetetrasulfonic acid sodium salt; 1,3,6-Pyrenetrisulfonic acid sodium salt; D&C Green Number 8; Derivative spectrophotometry; HPLC; Pyranine.

Specifications in the U.S. Code of Federal Regulations for the color additive D&C Green Number 8 (Color Index Number 59040) limit the levels of the subsidiary colors 1,3,6-pyrenetrisulfonic acid trisodium salt (P3S) and 1,3,6,8-pyrenetetrasulfonic acid tetrasodium salt (P4S). The present paper describes a comparative study of two possible methods to replace the currently used multi-step TLC/spectrophotometry method of separating and quantifying the minor components P3S and P4S in G8. One of the new approaches uses conventional high-performance liquid chromatog. (HPLC) and the other, derivative spectrophotometry. While the derivative spectrophotometric method was shown to be inadequate for the anal. of minor components overwhelmed by components of much higher concentration, the HPLC method was proven highly effective. The closely related, very polar compounds P3S and P4S were separated by the new HPLC method in less than 4 min using a conventional HPLC instrument. P3S and P4S were quantified by using five-point calibration curves with data points that ranged from 0.45 to 7.63% and from 0.13 to 1.82%, by weight, for P3S and P4S, resp. The HPLC method was applied to the anal. of test portions from 20 batches of D&C Green Number 8 submitted to the U.S. Food and Drug Administration for certification.

Journal of Chromatography A published new progress about Derivative spectrophotometry. 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

Kichambare, Padmakar; Rodrigues, Stanley; Hankins, Kie; Balbuena, Perla B.; Feld, William A.; Scanlon, Lawrence published the artcile< Phthalocyanine as catalyst for rechargeable lithium-oxygen batteries>, Electric Literature of 112-63-0, the main research area is phthalocyanine catalyst rechargeable lithium oxygen battery.

Tetrabutylammonium lithium phthalocyanine (TBA-LiPc) can function as a soluble catalyst in low-donor-number (DN) solvents such as tetraethylene glycol di-Me ether (TEGDME) (DN=16.6) for rechargeable lithium-oxygen cells. It is able to do so given that mol. oxygen forms a complex with the lithium phthalocyanine anion thereby keeping oxygen and the reaction intermediates in solution D. functional theory (DFT) calculations show the mechanism for complex formation and cyclic voltammetry results support the notion of reaction intermediates that are soluble in solution during oxygen reduction and oxygen evolution reactions. Deep discharge of a lithium-oxygen cell with TBA-LiPc had a capacity that was 3.6 times greater (5.28 mAh) than a similar cell with no TBA-LiPc (1.47 mAh). Long-term cycling of a lithium-oxygen cell with TBA-LiPc at a fixed capacity of 0.55 mAh did not fail after 100 cycles. A similar cell without TBA-LiPc failed after 37 cycles. Long-term cycling of a lithium-oxygen cell with TBA-LiPc and using natural air in low humidity as the source of oxygen cycled 151 times before cell failure.

Journal of Porphyrins and Phthalocyanines published new progress about Atmosphere. 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

Zhang, Linye; Liu, Kun; Wei, Guangtao; Gao, Lei; Xin, Zongwu; Li, Junyu published the artcile< Intensification of catalytic transfer hydrogenation of fatty acid methyl esters by using ultrasound>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is catalytic transfer hydrogenation fatty acid methyl ester ultrasound intensification.

Ultrasound was applied to intensity the catalytic transfer hydrogenation (CTH) of highly unsaturated fatty acid Me esters (FAMEs) to realize the effective hydrogenation of FAMEs under mild conditions. Under the optimum reaction conditions of ultrasound-assisted CTH using La-doped nickel-boride amorphous alloy (Ni-La-B) as catalyst, sodium borohydride as hydrogen donor and water as solvent, a high conversion ratio of hydrogenation for polyunsaturated FAMEs could be easily realized at 35°C at 120 min (ca. 78.66%). It was found that ultrasound presented a significant intensification effect on the CTH of FAMEs; different thsn the conventional and ultrasound approaches, by using ultrasound-assisted approach of CTH, deep hydrogenation could be avoided to a certain extent even under the high conversion ratio of hydrogenation, and the hydrogenated product with good performance was easily gained. The self-purification function of ultrasound on the catalyst played the most important pos. effect on the intensification of CTH of FAMEs. Overall, the ultrasound-assisted approach played an effective process intensification on the CTH of FAMEs to produce high-quality products under mild conditions.

Chemical Engineering and Processing published new progress about Amorphous materials. 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

Wang, Yantao; Zhao, Deyang; Triantafyllidis, Konstantinos S.; Ouyang, Weiyi; Luque, Rafael; Len, Christophe published the artcile< Microwave-assisted catalytic upgrading of bio-based furfuryl alcohol to alkyl levulinate over commercial non-metal activated carbon>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is activated carbon alcoholysis catalyst furfuryl alc alkyl levulinate microwave.

A cheap and com. available non-metal activated carbon (AC) as an efficient catalyst for the alcoholysis of furfuryl alc. (FA) to alkyl levulinate (AL) under microwave assistance was firstly investigated. The catalyst gave an impressive Me levulinate (ML) yield of 78% in only 5 min at 170 °C in the presence of FA (0.2 M, 3 mL) and AC (100 mg). Various reaction parameters in dependence of time such as temperature, catalyst and feedstock loadings as well as solvent types have been optimized. The re-utilization experiments of the catalyst showed that the activity related to the acidic groups of the catalysts, and the deactivation was due to the leaching of acidic specie, which was easily extracted by the solvent. Note that extremely low concentration of the active species extracted from AC (less than 1 wt %) could also give 62% ML yield. The present study provided a promising way for AL synthesis over cheap, com. available and environmentally benign catalyst.

Molecular Catalysis published new progress about Alcoholysis. 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

Zhang, Chao; Spevak, Wayne; Zhang, Ying; Burton, Elizabeth A.; Ma, Yan; Habets, Gaston; Zhang, Jiazhong; Lin, Jack; Ewing, Todd; Matusow, Bernice; Tsang, Garson; Marimuthu, Adhirai; Cho, Hanna; Wu, Guoxian; Wang, Weiru; Fong, Daniel; Nguyen, Hoa; Shi, Songyuan; Womack, Patrick; Nespi, Marika; Shellooe, Rafe; Carias, Heidi; Powell, Ben; Light, Emily; Sanftner, Laura; Walters, Jason; Tsai, James; West, Brian L.; Visor, Gary; Rezaei, Hamid; Lin, Paul S.; Nolop, Keith; Ibrahim, Prabha N.; Hirth, Peter; Bollag, Gideon published the artcile< RAF inhibitors that evade paradoxical MAPK pathway activation>, Formula: C19H34O2, the main research area is RAF inhibitor melanoma.

Oncogenic activation of BRAF fuels cancer growth by constitutively promoting RAS-independent mitogen-activated protein kinase (MAPK) pathway signalling. Accordingly, RAF inhibitors have brought substantially improved personalized treatment of metastatic melanoma. However, these targeted agents have also revealed an unexpected consequence: stimulated growth of certain cancers. Structurally diverse ATP-competitive RAF inhibitors can either inhibit or paradoxically activate the MAPK pathway, depending whether activation is by BRAF mutation or by an upstream event, such as RAS mutation or receptor tyrosine kinase activation. Here we have identified next-generation RAF inhibitors (dubbed ‘paradox breakers’) that suppress mutant BRAF cells without activating the MAPK pathway in cells bearing upstream activation. In cells that express the same HRAS mutation prevalent in squamous tumors from patients treated with RAF inhibitors, the first-generation RAF inhibitor vemurafenib stimulated in vitro and in vivo growth and induced expression of MAPK pathway response genes; by contrast the paradox breakers PLX7904 and PLX8394 had no effect. Paradox breakers also overcame several known mechanisms of resistance to first-generation RAF inhibitors. Dissociating MAPK pathway inhibition from paradoxical activation might yield both improved safety and more durable efficacy than first-generation RAF inhibitors, a concept currently undergoing human clin. evaluation with PLX8394.

Nature (London, United Kingdom) published new progress about Antitumor agent resistance. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Guo, Weihong; Vrdoljak, Gordon; Liao, Ven-Chi; Moezzi, Bahman published the artcile< Major constituents of cannabis vape oil liquid, vapor and aerosol in California vape oil cartridge samples>, Category: esters-buliding-blocks, the main research area is cannabis vape oil liquid vapor aerosol major constituent GCMS; EVALI (e-cigarette or vaping product use-associated lung injury); GC-MS; aerosol; delta-9 tetrahydrocannabinol; nontarget; toxin; vape oil; vapor.

During the E-cigarette or Vaping product use Associated Lung Injury (EVALI) outbreak of August 2019 to Feb. 2020, the California Department of Public Health, Food and Drug Laboratory Branch received numerous cannabis vape oil cartridge investigation samples from throughout the state. Many of these products were directly linked to patients; others were collected as part of investigations. We determined the major ingredients and additives in twelve unused cannabis vape oil cartridge samples obtained before (n = 2) and during the EVALI outbreak (n = 10) in California from Sept. 2018 to Dec. 2019. We tested for major constituents in vape oil liquid, vape oil vapor, and vape oil aerosol phases. A nontargeted Gas Chromatog. Mass Spectrometry direct injection screening method was developed for vape oils, a headspace heating module used for vape oil vapors and a solid-phase microextraction (SPME) vaping rig for aerosols generated by vaping. We have identified more than 100 terpenes and natural extracts, 19 cannabinoids, and other potential toxic additives such as Vitamin E Acetate, Polyethylene Glycols, and Medium Chain Triglycerides. We determined more terpenes and minor cannabinoids can be produced via vaporizing and aerosolizing the vape oil. Delta9-THC and potential toxic additives were found at lower levels in the vapor and aerosol than in the vape liquid

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Aerosols. 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

Hoffmann, J. H. O.; Schaekel, K.; Hartl, D.; Enk, A. H.; Hadaschik, E. N. published the artcile< Dimethyl fumarate modulates neutrophil extracellular trap formation in a glutathione- and superoxide-dependent manner>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is psoriasis dimethyl fumarate neutrophil extracellular trap glutathione superoxide.

Neutrophil (polymorphonuclear) granulocytes (PMN) have been shown to contribute to the pathogenesis of psoriasis by releasing interleukin-17 and LL37-DNA complexes via neutrophil extracellular traps (NETs), webs of chromatin strands decorated with antimicrobial peptides, in psoriatic skin. Fumaderm, a fumaric acid ester (FAE) formulation consisting of different FAE salts, has been successfully used to treat psoriasis for decades. Most recently, FAE treatment was reported to inhibit NET formation in murine epidermolysis bullosa acquisita. To elucidate the effect of FAE treatment on human psoriasis and healthy donor NET formation. Among the compounds present in the FAE formulation, di-Me fumarate (DMF) pretreatment of human psoriasis and healthy donor PMN resulted in a consistent inhibitory effect on NET formation in response to phorbol 12-myristate 13-acetate but not to platelet activating factor and ionomycin. This effect was L-glutathione (GSH) dependent and involved a decrease in reactive oxygen species (ROS) production, a key event in NET formation. In contrast, G-protein-coupled signalling and protein synthesis were not involved. Monomethyl fumarate (MMF) was found to slightly reduce ROS production without affecting NET formation. We report DMF as a potent, stimulus-specific, GSH- and ROS-dependent modulator of NET formation. Our results support the notion that modulation of NET formation contributes to the beneficial effects of FAEs in a variety of inflammatory conditions.

British Journal of Dermatology published new progress about Antioxidants. 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