Category: esters-buliding-blocks

Wafti, Nur Sulihatimarsyila Abd; Yunus, Robiah; Lau, Harrison Lik Nang; Yaw, Thomas Choong Shean; Aziz, Suraini Abdul published the artcile< Immobilized lipase-catalyzed transesterification for synthesis of biolubricant from palm oil methyl ester and trimethylolpropane>, COA of Formula: C19H34O2, the main research area is Biocatalysts; Enzyme; Palm oil; Physicochemical; Polyol esters.

Abstract: The present study reports the effects of three com. immobilized lipases namely Novozyme 435 from Candida antarctica lipase B (CALB), Lipozyme TL IM from Thermomyces lanuginosus and Lipozyme RM IM from Rhizomucor miehei on the production of trimethylolpropane (TMP) ester from high oleic palm Me ester (HO-PME) and TMP. The TMP ester is a promising base oil for biolubricants that are easily biodegradable and non-toxic to humans and the environment. Enzymic catalysts are insensitive to free fatty acid (FFA) content, hence able to mitigate the side reactions and consequently reduce product separation cost. The potential of these enzymes to produce TMP ester in a solvent-free medium was screened at various reaction time (8, 23, 30 and 48 h), operating pressure (0.1, 0.3 and 1.0 mbar) and enzyme dosage (1, 3, 5 and 10% weight/weight). The reaction was conducted at a constant temperature of 70 °C and a molar ratio of 3.9:1 (HO-PME: TMP). Novozyme 435 produced the highest yield of TMP ester of 95.68 ± 3.60% under the following conditions: 23 h reaction time, 0.1 mbar operating pressure and 5% weight/weight of enzyme dosage. The key lubrication properties of the produced TMP ester are viscosity index (208 ± 2), pour point (- 30 ± – 2 °C), cloud point (- 15 ± – 2 °C), onset thermal degradation temperature (427.8 °C), and oxidation stability, RPVOT (42 ± 4 min). The properties of the TMP ester produced from the enzymic transesterification are comparable to other vegetable oil-based biolubricants produced by chem. transesterification.

Bioprocess and Biosystems Engineering published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

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

Campbell, Shirley E.; Comer, Murray C.; Derbyshire, Paul A.; Despinoy, Xavier L. M.; McNab, Hamish; Morrison, Roderick; Sommerville, Craig C.; Thornley, Craig published the artcile< Synthesis of pyrrolizin-3-ones by flash vacuum pyrolysis of pyrrol-2-ylmethylidene Meldrum's acid derivatives and 3-(pyrrol-2-yl)propenoic esters>, COA of Formula: C8H9NO3, the main research area is pyrrolizinone preparation flash vacuum pyrolysis; flash vacuum pyrolysis pyrrolylmethylidene Meldrums acid; pyrrolylpropenoic ester flash vacuum pyrolysis; pyrolysis flash vacuum Meldrums acid pyrrolylpropenoate.

Monosubstituted pyrrolizin-3-ones, e.g., I (R1 = Me, H, R5 = CO2Et, Ph, H, R6 = Ph, H, R7 = Me, OMe, CO2Me, Ph, H) with substituents at the 1-, 5-, 6- or 7-positions are prepared in excellent yield by flash vacuum pyrolysis (FVP) of appropriate Meldrum’s acid derivatives The mechanism involves formation of the pyrrol-2-ylmethylideneketene , which can also be generated thermally from 3-(pyrrol-2-yl)propenoate esters. This alternative route has been used to make a range of 2-substituted pyrrolizin-3-ones, again in excellent yield. The 3-oxo-3H-pyrrolizine-2-carboxylic acid could not be made in this way owing to facile decarboxylation to pyrrolizinone I, and extension to the formation of the azaazulenone II was again unsuccessful.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry published new progress about 7126-50-3. 7126-50-3 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO3, COA of Formula: C8H9NO3.

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

Shariff, Azim; McLean, Stewart published the artcile< The synthesis of Nauclea indole-pyridine alkaloids. 3,4-Disubstituted and 3,4,5-trisubstituted pyridines as synthetic intermediates; a total synthesis of (±)-decarbomethoxy-3α- and -3β-nauclechine>, Quality Control of 33402-75-4, the main research area is nauclechine decarbomethoxy epimer synthesis; pyridine substituted; pyridineacetic acid substituted Bischler Napieralski; Nauclea indole pyridine alkaloid.

Synthetic routes to a number of 3,4-disubstituted and 3,4,5-trisubstituted pyridines was explored. These pyridines, designed to be used in the synthesis of Nauclea indole-pyridine alkaloids, are potentially useful intermediates in a number of syntheses. Substituted 4-pyridineacetic acids were prepared and the exptl. limitations associated with their synthesis and use in subsequent reactions such as the Bischler-Napieralski cyclization were discussed. A synthesis of decarbomethoxynauclechine from 4-methylnicotinaldehyde avoiding these difficulties was described. (±)-Decarbomethoxy-3α-nauclechine (I; R = α-H) and (±)-decarbomethoxy-3β-nauclechine (I; R = β-H) were obtained and their structure and stereochem. were established, but it was not possible to demonstrate which corresponded to the natural alkaloid, decarbomethoxynauclechine.

Canadian Journal of Chemistry published new progress about Alkaloids Role: SPN (Synthetic Preparation), PREP (Preparation). 33402-75-4 belongs to class esters-buliding-blocks, and the molecular formula is C8H9NO2, Quality Control of 33402-75-4.

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

Ding, Lan; Zhou, Shixin; Li, Dahua; Wu, Chengfeng; Xing, Yuzhi; Song, Bo published the artcile< A facile method to incorporate tetraphenylethylene into polymeric amphiphiles: High emissive nanoparticles for cell-imaging>, Reference of 71195-85-2, the main research area is amphiphile polymer nanoparticle fluorescent probe cell imaging.

Encapsulating fluorogens into polymeric nanoparticles is proven an effective method to shield the fluorogens from the outer environment and improve the biocompatibility as well. Conventionally, the fluorogens are firstly conjugated to the monomers and then polymerized into macromols., where tedious mol. design and synthesis was unavoidable. Herein, we present a facile method to prepare the fluorogen-functionalized polymer, and then use the polymer as build blocks to fabricate nano-probes aiming at cell-imaging. Unlike the conventional ways, we prepared a homopolymer with active esters on the repeating units and used the polymer as matrix to graft fluorogens and hydrophilic groups. Note that the fluorogen and hydrophilic groups selected in our study were tetraphenylethylene (TPE) and polyethylene glycol (PEG), resp. The resulting amphiphilic random copolymer self-assembled into spherical nanoparticles with size around 225 nm in aqueous solution With comparable amount of TPE moieties, the polymeric nanoparticles demonstrated much stronger emission than the nanoparticles formed by small mols. of TPE derivatives The polymeric nanoparticles showed very good stability and biocompatibility, and were employed to label Hela cells and gave high-contrast fluorescent images. We anticipate that the methodol. presented in this study might be developed into a general avenue to encapsulating fluorogens into nanoparticles.

Dyes and Pigments published new progress about Amphiphiles. 71195-85-2 belongs to class esters-buliding-blocks, and the molecular formula is C9H3F5O2, Reference of 71195-85-2.

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