Month: October 2022

Liu, Qinfeng; Jiang, Liang; Zhao, Yuanyang; Wang, Yi; Lei, Jingxin published the artcile< Preparation and characterization of a novel form-stable phase change material for thermal energy storage>, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate), the main research area is polytrimethylolpropane trimethacrylate stearyl methacrylate phase change thermal energy storage.

A series of novel polymeric form-stable phase change materials (FSPCMs) composed of poly(trimethylolpropane trimethacrylate-stearyl methacrylate) (PTS) and stearic acid were synthesized via solvent-free bulk polymerization Stearic acid was used as phase change component, and PTS acted as supporting material. The chem. structure, crystalline properties, phase change ability, thermal reliability, and stability were characterized by Fourier transform IR spectroscopy, X-ray diffraction (XRD), polarizing optical microscopy (POM), differential scanning calorimetry (DSC), accelerated thermal cycling testing, and thermogravimetric anal. (TG), resp. The DSC results revealed that the maximum freezing and melting latent heat can reach 143.5 and 146.7 J g-1. The POM and XRD results proved the existence of spherocrystal. Accelerating thermal test and TG demonstrated that FSPCMs had good reliability and stability in practical application. The prepared form-stable phase change materials with high enthalpy and proper phase change temperature have a promising prospect in thermal energy storage.

Journal of Thermal Analysis and Calorimetry published new progress about Crystal structure. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate).

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

Trost, Barry; Krische, Michael J. published the artcile< Palladium-Catalyzed Enyne Cycloisomerization Reaction in an Asymmetric Approach to the Picrotoxane Sesquiterpenes. 2. Second-Generation Total Syntheses of Corianin, Picrotoxinin, Picrotin, and Methyl Picrotoxate>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is palladium catalyzed enyne cycloisomerization picrotoxane sesquiterpene synthesis; asym synthesis corianin picrotoxinin picrotin methyl picrotoxate; bisdibenzophospholylpropane ligand palladium catalyst enyne cycloisomerization; diphenylphosphinobenzoic acid ligand palladium catalyst enyne cycloisomerization.

An alternative, more efficient synthesis of the picrotoxane core by palladium-catalyzed cycloisomerization of an enyne requires the design of a new catalyst system based upon 1,3-bis(dibenzophospholyl)propane and 2-(diphenylphosphino)benzoic acid as ligands. Thus, unlike thermal processes which leave little opportunity to address failed reactions, the transition-metal-catalyzed reaction provides opportunities for catalyst modification to overcome limitations. In this way, a seven-step synthesis of the picrotoxane core from carvone emerges. The formation of the bislactone depends critically on the ring substitution pattern. A myriad of selective transannular cyclizations occur as a function of this substitution pattern. The bislactone serves as a pivotal intermediate to picrotoxinin (I), picrotin (II), and corianin (III). During the course of the manipulation of the oxidation pattern to create the correct bislactone, an intermediate generated also provides access to Me picrotoxate (IV). An improved sequence from the bislactone to corianin compared to the first generation evolves-in part derived from enhanced control of stereoselectivity in the functionalization of the double bond in the cyclohexenyl portion of the picrotoxane skeleton. Later in the sequence, a hydroxyl-directed chemoselective lactone reduction is employed using lithium triacetoxyborohydride. In the course of these studies, two reactions that involve substitution with retention of configuration occur in high yield as a result of the remarkable reactivity of this densely functionalized ring system.

Journal of the American Chemical Society published new progress about Cyclization. 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

Yang, Xingjie; Jiang, Xubao; Bashir, Muhammad Sohail; Kong, Xiang Zheng published the artcile< Preparation of Highly Uniform Polyurethane Microspheres by Precipitation Polymerization and Pd Immobilization on Their Surface and Their Catalytic Activity in 4-Nitrophenol Reduction and Dye Degradation>, Reference of 112-63-0, the main research area is palladium immobilized polyurethane microsphere catalyst nitrophenol reduction dye degradation.

Polyurethanes (PUNs) have been widely used in many fields. However, there are few reports on their microsphere preparation through precipitation polymerization Herein, uniform PUN microspheres are prepared by precipitation polymerization of toluene diisocyanate and trimethylolpropane, without any surfactant and stabilizer. Under optimized conditions, monomers are fully polymerized within 2 h at a monomer concentration as high as 25.0 wt %, with a high yield of the microspheres (96.9%). By loading Pd on their surface, composite microspheres Pd@PUN are obtained and used as catalysts. 4-Nitrophenol is completely reduced within 1 min, with a kinetic constant of 4.96 min-1, significantly higher than many reported Pd-loaded catalysts, and with comparable reusability. Used in degradation of dye mols., the catalytic performance is practically unchanged after 20 recycled uses. This work provides a simple method for the preparation of highly uniform PUN microspheres with a high yield and their Pd-loaded catalysts, both of great potential for various applications.

Industrial & Engineering Chemistry Research published new progress about Catalytic wastewater treatment. 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

Wang, Wenchao; Liu, Huili; Li, Fashe; Wang, Hua; Ma, Xin; Li, Jingjing; Zhou, Li; Xiao, Quan published the artcile< Effects of unsaturated fatty acid methyl esters on the oxidation stability of biodiesel determined by gas chromatography-mass spectrometry and information entropy methods>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is fatty acid methyl ester oxidation gas chromatog mass spectrometry.

To explore the trend of fatty acid Me esters (FAMEs) during the oxidation process of biodiesel, this study uses gas chromatog. – mass spectrometry (GC-MS) combined with information entropy theory to propose a new method to analyze the effect of FAMEs on the stability of biodiesel (especially with different amounts of unsaturated FAMEs). The induction periods of the main FAMEs in biodiesel were determined by the Rancimat method. The results showed that the longest induction period of Me stearate was 248 h, while the induction of Me linoleate was only 0.12 h. Accelerated oxidation of biodiesel, using GC-MS anal. showed that the oxidation trends of FAMEs was different. The oxidation rate of Me linoleate was the fastest. A math. equation was proposed to calculate the trend of FAMEs. The results showed that during the 5 h accelerated an oxidation process, the content of Me linoleate decreased from 28.35% to 2.10%, while the content of Me oleate decreased by 18.21%. Using information entropy, the weighting coefficients of FAMEs in the oxidation process of biodiesel were calculated The weighting coefficient of Me linoleate was as high as 0.6797. Me linoleate was the main reason why biodiesel was easily oxidized.

Renewable Energy published new progress about Biodiesel fuel. 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

Kleinbeck, Florian; Toste, F. Dean published the artcile< Gold(I)-Catalyzed Enantioselective Ring Expansion of Allenylcyclopropanols>, Synthetic Route of 112-63-0, the main research area is allenylcyclopropanol preparation chiral gold catalyst preparation ring expansion; cyclobutanone vinyl derivative stereoselective preparation crystal structure.

The asym. gold(I)-catalyzed ring expansion of 1-allenylcyclopropanols is described. The method provides synthetically valuable cyclobutanones with a vinyl-substituted quaternary stereogenic center in high enantioselectivities and yields. The method shows a broad substrate scope, tolerating protected alcs. and amines, alkenes, unsaturated esters, and acetals. The reaction is easily adjustable to large-scale synthesis, leading to product formation without significant loss of selectivity or yield with only 0.5 mol% catalyst loading.

Journal of the American Chemical Society published new progress about Alcohols, propargyl Role: 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, Synthetic Route of 112-63-0.

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

Felpin, Francois-Xavier; Ibarguren, Oier; Nassar-Hardy, Luma; Fouquet, Eric published the artcile< Synthesis of Oxindoles by Tandem Heck-Reduction-Cyclization (HRC) from a Single Bifunctional, in Situ Generated Pd/C Catalyst>, Reference of 30095-98-8, the main research area is methyl nitroaryl acetate formaldehyde methylenation; nitroaryl acrylate preparation aromatic diazonium salt hydrogen reusable palladium; Heck reduction cyclization arylmethyl oxindole preparation; catalyst Heck reduction cyclization reusable palladium.

A tandem sequence involving palladium-catalyzed sequential Heck-reduction-cyclization transformations in mild conditions has been developed for the synthesis of oxindoles, e.g., I. The protocol involves inexpensive reagents and does not require any additives such as base or ligands.

Journal of Organic Chemistry published new progress about Carboxylic esters Role: RCT (Reactant), RACT (Reactant or Reagent) (nitroaralkyl). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Reference of 30095-98-8.

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

Jiang, Qiuxia; Li, Anquan; Liu, Xiang; Yu, Yue; Zhu, Baofu; Cao, Hua published the artcile< Lewis Acid-Catalyzed Synthesis of Polysubstituted Furans from Conjugated Ene-yne-ketones and 1,3,5-Triazinanes>, SDS of cas: 94-02-0, the main research area is furan preparation green chem regioselective; conjugated ene yne ketone triazinane bond formation.

An efficient and metal-free approach to the construction of diverse functionalized furan derivatives has been developed from ene-yne-ketones and 1,3,5-triazinanes. As an atom-economical and environmentally-friendly protocol, the new conditions are suitable for selective C-N and C-O bond formation of a wide range of polysubstituted furans in one pot.

Journal of Organic Chemistry published new progress about C-N bond formation. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, SDS of cas: 94-02-0.

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

Mohammed, Eman H. M.; Mandal, Dindyal; Mozaffari, Saghar; Abdel-Hamied Zahran, Magdy; Osman, Amany Mostafa; Tiwari, Rakesh Kumar; Parang, Keykavous published the artcile< Comparative molecular transporter properties of cyclic peptides containing tryptophan and arginine residues formed through disulfide cyclization>, SDS of cas: 112-63-0, the main research area is lamivudine disulfide peptide arginine HIV infection breast gastric cancer; cancer; cell-penetrating peptide; cellular uptake; cytotoxicity; disulfide bridge; drug delivery; phosphopeptide.

We have previously reported cyclic cell-penetrating peptides [WR]5 and [WR]4 as mol. transporters. To optimize further the utility of our developed peptides for targeted therapy in cancer cells using the redox condition, we designed a new generation of peptides and evaluated their cytotoxicity as well as uptake behavior against different cancer cell lines. Thus, cyclic [C(WR)xC] and linear counterparts (C(WR)xC), where x = 4-5, were synthesized using Fmoc/tBu solid-phase peptide synthesis, purified, and characterized. The compounds did not show any significant cytotoxicity (at 25 μM) against ovarian (SK-OV-3), leukemia (CCRF-CEM), gastric adenocarcinoma (CRL-1739), breast carcinoma (MDA-MB-231), and normal kidney (LLCPK) cells after 24 and 72 h incubation. Both cyclic [C(WR)5C] and linear (C(WR)5C) demonstrated comparable mol. transporter properties vs. [WR]5 in the delivery of a phosphopeptide (F′-GpYEEI) in CCRF-CEM cells. The uptake of F′-GpYEEI in the presence of 1,4-dithiothreitol (DTT) as the reducing agent was significantly improved in case of l(C(WR)5C), while it was not changed by [C(WR)5C]. Fluorescence microscopy also demonstrated a significant uptake of F′-GpYEEI in the presence of l(C(WR)5C). Cyclic [C(WR)5C] improved the uptake of the fluorescent-labeled anti-HIV drugs F′-d4T, F′-3TC, and F′-FTC by 3.0-4.9-fold. These data indicate that both [C(WR)5C] and linear (C(WR)5C) peptides can act as mol. transporters.

Molecules published new progress about Cell proliferation. 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

Choi, Chulho; Tian, Shi-Kai; Deng, Li published the artcile< A formal catalytic asymmetric synthesis of (+)-biotin with modified cinchona alkaloids>, SDS of cas: 112-63-0, the main research area is biotin formal catalytic asym synthesis desymmetrization meso cyclic anhydride; vitamin B7 formal catalytic asym synthesis; cinchona alkaloid catalyst desymmetrization meso cyclic anhydride solvolysis; chemoselective reduction hemiester biotin formal catalytic asym synthesis; lactone preparation hemiester chemoselective reduction cyclization.

A formal catalytic asym. synthesis of (+)-biotin (I) was realized. The key steps involve a catalytic, highly enantioselective and quant. desymmetrization of a meso cyclic anhydride followed by a one-pot chemoselective reduction to form the optically active lactone intermediate in the Goldberg-Sternbach (+)-biotin synthesis.

Synthesis published new progress about Lactones Role: SPN (Synthetic Preparation), 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

gargari, Mitra Madani; Rahnama, Kamran; Tabarestani, Maede Shahiri published the artcile< Synthesis of nanostructure molecularly imprinted copolymer for separation of antifungal bioactive di-(2-ethylhexyl) phthalate from biocontrol fungi metabolites>, Application of C18H26O6, the main research area is metabolome di 2 ethylhexyl phthalate Fusarium Trichoderma.

Among biocontrol fungi, Trichoderma species produce a wide range of bioactive compounds with antifungal activities. In this study, Di-(2-Ethylhexyl) Phthalate (DEHP) is identified via gas chromatog.-mass spectrometry (GC-MS) device in Trichoderma atroviridae (1-3) secondary metabolites and its antifungal effectiveness is confirmed. An eco-friendly approach for the extraction of DEHP is carried out by a nanoporous molecularly imprinted methacrylic acid-based network copolymer as a solid sorbent. Molecularly imprinted polymers (MIPs) are synthesized by pprotein polymn using DEHP as a template, methacrylic acid (MAA) as a functional monomer, and trimethylolpropane trimethacrylate (TRIM) as a cross-linker with mol. ratio (1: 4: 8). After the removal of DEHP, the nanoporous polymer could recognize and rebind specifically the same or structurally very similar mols. The synthesized MIPs exhibit a suitable tendency to absorb the template with the highest binding capacity of 300 mg/g for DEHP in n-Hexane solvent as a solid phase extraction (SPE) system. The measured particle size of the MIPs with dynamic light scattering (DLS) is reported at 75.38 nm. In addition, the porosity of the MIPs is evaluated by nitrogen gas adsorption/desorption using Brouneur Emmet Teller (BET) anal. Indicate that nanoporous MIPs with an av pore diameter of 2.70 nm and a sp surface area of 309 (cm3/g) is achieved. According to the above-mentioned results, nanoporous MIPs could be considered as an acceptable candidate for the seperation of antifungal bioactive compounds (natural fungicide) such as DEHP as an eco-friendly method in order to replace chem. pesticides.

Journal of Water and Environmental Nanotechnology published new progress about Fungicides. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Application of C18H26O6.

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